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Description
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
The VG3617801CT is CMOS Synchronous Dynamic RAMs organized as 1,048,576-word X 8-bit X 2bank. It is fabricated with an advanced submicron CMOS technology and is designed to operate from a single 3.3V power supply. This is packaged using JEDEC standard pinouts and standard plastic TSOP.
Features
• Single 3.3V( ± 0.3V ) power supply • Clock Frequency:100MHz • Fully synchronous with all signals referenced to a positive clock edge • Programmable CAS Iatency (2,3) • Programmable burst length (1,2,4,8,& Full page) • Programmable wrap sequence (Sequential/Interleave) • Automatic precharge and controlled precharge • Auto refresh and self refresh modes • Dual Internal banks controlled by A11(Bank select) • Simultaneous and independent two bank operation • I/O level : LVTTL interface • Random column access in every cycle • X8 organization • Input/output control by DQM • 2048 refresh cycles/32ms • Burst termination by burst stop and precharge command • Burst read single write option
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Pin Configuration
VDD
DQ0
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
44-Pin Plastic TSOP(II)(400 mil)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38
VSS
DQ7
VSSQ
DQ1
VSSQ
DQ6
VDDQ
DQ2
VDDQ
DQ5
VSSQ
DQ3
VSSQ
DQ4
VG3617801CT
37 36 35 34 33 32 31 30 29 28 27 26 25 24 23
VDDQ
NC NC WE CAS RAS CS
VDDQ
NC NC DQM CLK CKE NC
(BS)A11 A10 A0 A1 A2 A3 VDD
A9 A8 A7 A6 A5 A4 VSS
Pin Description (VG3617801CT) Pin Name A0-A11 Function Address inputs - Row address A0-A10 - Column address A0-A8 A11:Bank select Data-in/data-out Row address strobe Column address strobe Write enable Ground Power Pin Name DQM Function DQ mask enable
DQ0~DQ7 RAS CAS WE VSS VDD
CLK CKE CS VDDQ VSSQ
Clock input Clock enable Chip select Supply voltage for DQ Ground for DQ
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VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Block Diagram
CLK CKE
Clock Generator
Address
Mode Register
Row Decoder
Row Address Buffer & Refresh Counter
Bank B
Bank A
Sense Amplifier
RAS CAS WE Control Logic CS Command Decoder
Data Control Circuit
Input & Output Buffer
Latch Circuit
Column Address Buffer & Burst Counter
Column Decoder & Latch Circuit
DQM
DQ
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Absolute Maximum Ratings
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Parameter Voltage on any pin relative to Vss Supply voltage relative to Vss Short circuit output current Power dissipation Operating temperature Operating temperature
Symbol VIN,VOUT VDD,VDDQ IOUT PD TOPT TSTG
Value -1.0 to +4.6 -1.0 to +4.6 50 1.0 0 to + 70 -55 to + 125
Unit V V mA W ¢J ¢J
Recommended DC Operating Conditions
Parameter Supply Voltage Input High Voltage, all inputs Input Low Voltage, all inputs
Symbol VDD VIH VIL
Min 3.0 2.0 -0.3
Typ 3.3 °– °–
Max 3.6 VDD+0.3 0.8
Unit V V V
Note
1 2
Note 1.Overshoot limit : VIH(MAX.)=VDDQ+2.0V with a pulse width < 3ns 2.Undershoot limit : VIL=VSSQ-2.0V with a pulse < 3ns and -1.5V with a pulse < 5ns
Capacitance (Ta=25¢J,f=1MHZ)
Parameter Input capacitance(CLK) Input capacitance(all input pins except data pins) Data input/output capacitance
Symbol C11 C12 CI/O
Min 2.5 2.5 4.0
Max 4 5 6.5
Unit pF pF pF
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Parameter Operating current Symbol ICC1 Test Conditions Burst length=1
t RC ≥t RC (MIN.)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
DC Characteristics(Recommended Operating Conditions unless otherwise noted)
CL=3
VG3617801CT -8H -8L -10 Min Max Min Max Min Max 90 90 85 85 3 2 30 85 3 2 30 80 3 2 30
Unit mA
Notes 1,2
,Io=0mA CL=2 One bank active Precharge standby current in power down mode Precharge standby current in Nonpower down mode ICC2 P CKE
≤ V IL(MAX.)tCK=15ns ≤ V IL(MAX)tCK= ∞ ≥ V IH(MIN.)tCK=15ns
mA
ICC2 PS CKE ICC2 N
CKE CS
mA
≥ V IH(MIN.)
6 6 6
Input signals are changed. one time during 30ns. ICC2 NS CKE
≥ V IH(MIN.), tCK= ∞ CLK ≤ V IL(MAX.)
CKE CKE CKE CS
Input signals are stable. Active standby current Icc3 P in power down mode Icc3 PS Active standby current Icc3 N in nonpower down mode
≤ V IL(MAX.),tCK=15ns ≤ V IL(MAX.),tCK= ∞ ≥ V IL(MAX.),tCK=15ns
3 2 30
3 2 30
3 2 30
mA
mA
≥ V IL(MIN.)
15 15 15
Input signals are changed one time during 30ns Icc3 NS
≥ V IH(MIN.) tCK= ∞ CLE ≤ V IL(MAX.)
CKE
Input signals are stable. Operating current (Burst mode) Refresh current Self refresh current Input leakage current Icc4
t CK
≥ tCK (MIN.),Io=0mA CL=3
120 115 110 105 2 -5 -5 5 5 0.4 2.4 2.4 -5 -5
120 105 110 105 2 5 5 0.4 2.4 -5 -5
105 100 100 95 2 5 5 0.4
mA
1,2
Burst length=4 Icc5 Icc6 ILI
t RC ≥t RC (MIN.)
CL=2 CL=3 CL=2
mA mA uA uA V V
2
CKE ≤ 0.2V V in ≥ 0 , V in ≤ V DD +0.3V
Pins not under test=0V Output leakage current ILO Output Low Voltage Output High Voltage VOL VOH
V OUT ≥0, V OUT ≤V DD
+0.3V
DQ# in H-Z., Dout disabled IOL=2mA IOH =2mA
Notes 1.Icc depends on output loading and cycle rates. Specified values are obtained with the output open. 2.Icc is measured on condition that addresses are changed only one time during tCK(MIN.).
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A.C Characteristics: Test Conditions: (Ta=0 to 70°C VDD=3.3V ± 0.3V ,VSS=0V)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
AC input Levels(V IH/VIL) Input rise and fall time Parameter CAS Latency 3 2 3 2
2.0/0.8V 1ns
Input timing reference level/ Output timing reference level Output load condition
1.4V 50pF Unit
symbol tCk3 tCk2 tAC3 tAC2 tCH tCL tCKS tCKH tAS tAH tDS tDH tCMS tCMH tOH tLZ tHZ tRRD tRCD tRP tRAS tRC tBDL tDAL tDPL tT tRSC tPDE tSRX tREF Min 10 10
-8H
CLK cycle time CLK to valid output delay CLK high pulse width CLK low pulse width CKE setup time CKE hold time Address setup time Address hold time Data input setup time Data input hold time Command setup time Command hold time Output data hold time CLK to output in low-Z CLK to output in Hi-Z Row active to active delay RAS to CAS delay Row precharge time ROW active time ROW cycle time Last data in to burst stop Data-in to ACT(REF) Command (Auto Precharge) Data-in to precharge Transition time Mode reg. set cycle Power down exit setup time Self refresh exit time Refresh time
3 3 3 1 2 1 2 1 2 1 3 0 3 20 20 20 50 70 1 CLK 1CLK+tRP 1 CLK 1 2 CLK 8 8
VG3617801CT -8L -10 Max Min Max Min Max 10 10 13 15 6 6 8 6 7 8 3 4 3 4 3 3 1 1 2 3 1 1 2 3 1 1 2 3 1 1 3 3 0 0 8 3 8 3 8 20 20 20 26 20 26 120,000 50 120,000 60 120,000 70 86 1 CLK 1 CLK 1CLK+tRP 1CLK+tRP 1 CLK 1 2 CLK 8 8 1 CLK 1 2 CLK 8 8
ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ms
10
10
10
32
32
32
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Basic Features and Function description 1.simplified State diagram
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Self
Refresh
try en
LF SE
Mode Register Set
MRS
IDLE
LF SE
it ex
REF
AUTO Refresh
CK E
E CK
ROW ACTIVE
BS T
ACT
Power Down
CKE CKE
T BS
Active Power Down
ad Re
W rit e
Au Write to p red with har ge
h wit rge ad cha Re Pre to Au
Write
Read
PRE
WRITE SUSPEND
CKE CKE
WRITE
Read
READ
CKE CKE
READ SUSPEND
Write
Write with Auto Precharge
AutoRead w Prec ith harg e
E(P PR
ith e d w arg Rea Prech o Aut
ter min atio n )
Read with Auto Precharge
WRITE A SUSPEND
CKE CKE
WRITE A
CKE READ A CKE
READ A SUSPEND
POWER ON
Precharge
Precharge
Automatic sequence Manual input Note: After the AUTO refresh operation, precharge operation is performed automatically and enter the IDLE state
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2.Truth Table 2.1 Command Truth Table
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
FUNCTION Device deselect No operation Mode register set Bank activate Read Read with auto precharge Write Write with auto precharge Precharge select bank Precharge all banks Burst stop Auto refresh (CBR)
Symbol DESL NOP MRS ACT READ READA WRIT WRITA PRE PALL BST CBR
CKE n-1 H H H H H H H H H H H H
n X X X X X X X X X X X H
CS H L L L L L L L L L L L
RAS X H L L H H H H L L H L
CAS X H L H L L L L H H H L
WE X H L H H H L L L L L H
A11 X X L V V V V V V X X X
A10 X X X V L H L H L H X X
A9A0 X X V V V V V V X X X X
2.2 DQM Truth Table
CKE FUNCTION Data write/output enable Data mask/output disable Upper byte write enable/output enable Lower byte write enable/output enable Upper byte write inhibit/output disable Lower byte inhibit/output disable Symbol ENB MASK ENBU ENBL MASKU MASKL n-1 H H H H H H n-1 X X X X X X U
DQM L L H L X H X X L X H
2.3 CKE Truth Table
Current State Activating Any Clock suspend Idle Idle Self refresh Idle Power down
Function Clock suspend mode entry Clock suspend Clock suspend mode exit CBR refresh command Self refresh entry Self refresh exit Power down entry Power down exit
Symbol
REF SELF
CKE n-1 n H L L L L H H H H L L H L H H L L H
CS X X X L L L H X X
RAS X X X L L H X X X
CAS X X X L L H X X X
WE X X X H H H X X X
Address X X X X X X X X X
H : High level, L : Low level X : high or Low level(Don’t care), V : Valid Data input
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2.4 Operative Command Table Notes 1
Current state Idle CS H L L L L L L L Row active H L L L L L L L Read H L L L L L L L L Write H L L L L L L L L RAS X H H H L L L L X H H H L L L L X H H H H L L L L X H H H H L L L L CAS X H L L H H L L X H L L H H L L X H H L L H H L L X H H L L H H L L WE X X H L H L H L X X H L H L H L X H L H L H L H L X H L H L H L H L X X BA,CA,A10 BA,CA,A10 BR,RA BA,A10 X Op-Code X X BA,CA,A10 BA,CA,A10 BA,RA BA,A10 X Op-Code X X X BA,CA,A10 BA,CA,A10 BA,RA BA,A10 X Op-Code X X X BA,CA,A10 BA,CA,A10 BA,RA BA,A10 X Op-Code Address Command DESL NOP or BST
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
(1/3)
Action Nop or Power down Nop or Power down ILLEGAL ILLEGAL Row active Nop Refresh or Self refresh Mode register access Nop Nop Begin read:Determine AP Begin write:Determine AP ILLEGAL Precharge ILLEGAL ILLEGAL Continue burst to end → Row active Continue burst to end → Row active Burst stop → Row active Term burst, new read:Determine AP Term burst, start write:Determine AP ILLEGAL Term burst,precharging ILLEGAL ILLEGAL Continue burst to end → write recovering Continue burst to end → Write recovering Burst stop → Row active Term burst, start read: determine AP Term burst, new write:Determine AP ILLEGAL Term burst precharging ILLEGAL ILLEGAL
Notes 2 2 3 3
READ/READA WRIT/WRITA ACT PRE/PALL REF/SELF MPS DESL NOP or BST READ/READA WRIT/WRITA ACT PRE/PALL REF/SELF MRS DESL NOP BST READ/READA WRIT/WRITA ACT PRE/PALL REF/SELF MRS DESL NOP BST READ/READA WRIT/WRITA ACT PRE/PALL REF/SELF MRS
4
5 5 3 6
7 7,8 3
7,8 7 3 9
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Current state Read with auto precharge CS H L L L L L L L L Write with auto precharge H RAS X H H H H L L L L X CA X H H L L H H L L X WE X H L H L H L H L X Address X X X BA,CA,A10 BA,CA,A10 BA,RA BA,A10 X Op-Code X
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
(2/3)
Command DESL NOP BST READ/READA WRIT/WRITA ACT PRE/PALL PEF/SELF MRS DESL
Action Continue burst to end → Prech arg ing Continue burst to end → Prech arg ing ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL Continue burst to end → Write recovering with auto precharge Continue burst to end → Write recovering with auto precharge ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL Nop → Enter idle after tRP Nop → Enter idle after tRP Nop → Enter idle after tRP ILLEGAL ILLEGAL ILLEGAL Nop → Enter idle after tRP ILLEGAL ILLEGAL Nop → Enter row active after tRCD Nop → Enter row active after tRCD Nop → Enter row active after tRCD ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL
Notes
3 3
L
H
H
H
X
NOP
L L L L L L L Precharging H L L L L L L L L Row activating H L L L L L L L L
H H H L L L L X H H H H L L L L X H H H H L L L L
H L L H H L L X H H L L H H L L X H H L L H H L L
L H L H L H L X H L H L H L H L X H L H L H L H L
X BA,CA,A10 BA,CA,A10 BA,RA BA,A10 X Op-code X X X BA,CA,A10 BA,CA,A10 BA,RA BA,A10 X Op-Code X X X BA,CA,A10 BA,CA,A10 BA,RA BA,A10 X Op-Code
BST READ/READA WRIT/WRITA ACT PRE/PALL REF/SELF MRS DESL NOP BST READ/READA WRIT/WRITA ACT PRE/PALL REF/SELF MRS DESL NOP BST READ/READA WRIT/WRITA ACT PRE/PALL REF/SELF MRS
3 3
3 3 3
3 3 3,10 3
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Current state Write recovering CS H L L L L L L L L Write recovering with auto precharge H L L L L L L L L Refreshing H L L L L Mode register accessing H L L L L RAS X H H H H L L L L X H H H H L L L L X H H L L X H H H L CA X H H L L H H L L X H H L L H H L L X H L H L X H H L X WE X H L H L H L H L X H L H L H L H L X X X X X X H L X X Address X X X BA,CA,A10 BA,CA,A10 BA,RA BA,A10 X Op-Code X X X BA,CA,A10 BA,CA,A10 BA,RA BA,A10 X Op-Code X X X X X X X X X X DESL NOP BST
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
(3/3)
Command
Action
Nop → Enter row active after tDPL Nop → Enter row active after tDPL Nop → Enter row active after tDPL
Notes
READ/READA WRIT/WRITA ACT PRE/PALL PEF/SELF MRS DESL NOP BST READ/READA WRIT/WRITA ACT REF/PALL REF/SELF MRS DESL NOP/BST READ/WRIT ACT/PRE/PALL REF/SELF/MRS DESL NOP BST READ/WRITE ACT/PRE/PALL/ REF/SELF/MRS
Start read, Determine AP New write, Determine AP ILLEGAL ILLEGAL ILLEGAL ILLEGAL
Nop → Enter precharge after tDPL Nop → Enter precharge after tDPL Nop → Enter precharge after tDPL
8
3 3
ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL ILLEGAL
Nop → Enter idle after tRC Nop → Enter idle after tRC
3,8 3 3 3
ILLEGAL ILLEGAL ILLEGAL
Nop → Enter idle after 2 Clocks Nop → Enter idle after 2 Clocks
ILLEGAL ILLEGAL ILLEGAL
Note 1. All entries assume that CKE was active (High level)during the preceding clock cycle. 2. If both banks are idle, and CKE is inactive(Low level), the device will enter Power down mode. All input buffers except CKE will be disabled. 3. Illegal to bank in specified states; Function may be legal in the bank indicated by Bank Address (BA), depending on the state of that bank. 4. If both banks are idle, and CKE is inactive(Low level), the device will enter Self refresh mode. All input buffers except CKE will be disabled. 5. IIIegal if tRCD is not satisfied. 6. IIIegal if tRAS is not satisfied. 7. Must satisfy burst interrupt condition. 8. Must satisfy bus contention, bus turn around, and/or write recovery requirements. 9. Must mask preceding data if tDPL is not satisfied. 10. IIIegal if tRRD is not satisfied.
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2.5 Command Truth Table for CKE Note 1 Current state Self refresh (S.R.)
CKE n-1 H L L L L L H H H H H H H H L L H L L H H H H H H H H H H L H H L L RAS n X H H H H L H H H H L L L L H L X H L H H H H H L L L L L X H L H L CS X H L L L X H L L L H L L L X X X X X H L L L L H L L L L X X X X X RAS X X H H L X X H H L X H H L X X X X X X H L L L X H L L L X X X X X
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
CAS X X H L X X X H L X X H L X X X X X X X X H L L X X H L L X X X X X
WE X X X X X X X X X X X X X X X X X X X X X X H L X X X H L X X X X X
Address X X X X X X X X X X X X X X X X X X
Action INVALID,CLK(n-1)would exit S.R. S.R. Recovery S.R. Recovery ILLEGAL ILLEGAL Maintain S.R. Idle after tRC Idle after tRC ILLEGAL ILLEGAL Begin clock suspend next cycle Begin clock suspend next cycle ILLEGAL ILLEGAL Exit clock suspend next cycle Maintain clock suspend INVALID, CLK(n-1) would exit P.D. EXIT P · D · → Idle Maintain power down mode Refer to operations in Operative Command Table Refer to operations in Operative Command Table Refer to operation in Operative Command Table Refresh Refer to operations in Operative Command Table Refer to operations in Operative Command Table Refer to operations in Operative Command Table Refer to operations in Operative Command Table Self refresh Refer to operations in Operative Command Table Power down Refer to operations in Operative Command Table Begin clock suspend next cycle Exit clock suspend next cycle Maintain clock suspend
Notes
2 2 2 2
Self refresh recovery
5 5
2
Power down (P.D.)
2
Both banks idle
X OpCode
X OpCode X X X X X
3
3
Any state other than listed above
4
Note 1. H : Hight level, L : low level, X : High or low level(Don't care). 2. CKE Low to High transition will re-enable CLK and other inputs asynchronously. A minimum setup time must be satisfied before any command other than EXIT. 3. Power down and Self refresh can be entered only from the both banks idle state. 4. Must be legal command as defined in Operative Command Table. 5.IIIegal if tSREX is not satisfied.
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VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
3.Initiallization The synchronous DRAM is initialized in the power on sequence. Once power has been applied, a 100us minimum delay is needed in which stable power and input signals are maintained. During this delay, CKE and DQM recommend to be held high. After the 100us delay, both banks must be precharged using the precharge command. Once precharge is completed and the minimum tRP is satisfied, the mode register can be programmed. Minimum two CBR refresh commands must be performed before or after the mode register set command. 4.Programming the Mode Register The mode register is programmed by the mode register set command using address bits A11 through A0 as data inputs. The register retains data until it is reprogrammed or until the device loses power. The mode register has four fields; Options CAS latency Wrap type Burst length : A11 through A7 : A6 through A4 : A3 : A2 through A0
Following mode register programming, no command can be asserted befor at least two clock cycles have elapsed. CAS Latency CAS latency is the most critical parameter to be set. It tells the device how many clocks must elapse before the data will be available. The SDRAM is capable of reconfiguring its internal architecture based on the value of CAS latency. The value is determined by the frequency of the clock and the speed grade of the device. The value can be programmed as 2 or 3. Burst Length Burst Length is the number of words that will be output or input in read or write cycle. After a read burst is completed, the output bus will become high impedance. The burst length is programmable as 1,2,4,8 or full page. Wrap Type (Burst Sequence) The wrap type specifies the order in which the burst data will be addressed. The order is programmable as either “Sequential” or “Interleave”. The method chosen will depend on the type of CPU in the system. Some microprocessor cache systems are optimized for sequential addressing and others for interleaved addressing. Both sequences support bursts of 1,2,4 and 8. Only the sequential burst. supports the full-page length.
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5.Mode Register
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
11 0 11 x 11 x
10 0 10 x 10 x
9 0 9 1 9 0
8 0 8 0 8 0
7 1 7 0 7 0
6 6 6
5
4
3
2
1 1 BL 1 BL
0 Reserved Test Set 0 0 Burst Read and Single Write X=Don’t care Mode Register Set Bits2-0 000 001 010 Burst length 011 100 101 110 111 Wrap type 0 1 WT=1 1
2 4 8 R R R R
5 4 LTMODE 5 4 LTMODE
3 2 WT 3 2 WT
WT=0 1
2 4 8 R R R
Full page
Sequential Interleave
Bits6-4 000 001 010 Latency mode 011 100 101 110 111
Remark R:Reserved
CAS Iatency R
R 2 3 R R R
R
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5.1 Burst Length and Sequence (Burst of Two) Starting Address (column address A0, binary) 0 1 (Burst of Four) Starting Address (column address A1-A0, binary) 00 01 10 11 (Burst of Eight) Starting Address (column address A2-A0, binary) 000 001 010 011 100 101 110 111 Sequential Addressing Sequence (decimal) 0,1,2,3,4,5,6,7 1,2,3,4,5,6,7,0 2,3,4,5,6,7,0,1 3,4,5,6,7,0,1,2 4,5,6,7,0,1,2,3 5,6,7,0,1,2,3,4 6,7,0,1,2,3,4,5 7,0,1,2,3,4,5,6 Sequential Addressing Sequence (decimal) 0,1,2,3 1,2,3,0 2,3,0,1 3,0,1,2 Sequential Addressing Sequence (decimal) 0,1 1,0
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Interleave Addressing Sequence(decimal) 0,1 1,0
Interleave Addressing Sequence(decimal) 0,1,2,3 1,0,3,2 2,3,0,1 3,2,1,0
Interl eave Addressing Sequence(decimal) 0,1,2,3,4,5,6,7 1,0,3,2,5,4,7,6 2,3,0,1,6,7,4,5 3,2,1,0,7,6,5,4 4,5,6,7,0,1,2,3 5,4,7,6,1,0,3,2 6,7,4,5,2,3,0,1 7,6,5,4,3,2,1,0
Full page burst is an extension of the above tables of sequential addressing, with the length being 512/ 256 words for 2Mx8/1Mx16 devices, respectively.
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6.Address Bits of Bank-Select and Precharge Row A0 A1 A2 A3 A4 A5 A6 (Activate command) 0 A7 A8 A9 A10 A11
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Select Bank A ”Activate” command
1 Select Bank B ”Activate” command
Row A0 A1 A2 A3 A4 A5 A6 (Precharge)
A7 A8 A9 A10 A11 A10 A11 Result 0 0 1 0 1 x Precharge Bank A Precharge Bank B Precharge All Banks
x:Don’t care
0 1
Disables Auto-Precharge (End of Burst) Enables Auto-Precharge (End of Burst)
Col. A0 A1 A2 A3 A4 A5 A6 (CAS strobes)
A7 A8 A9 A10 A11
0 Enable Read/Write commands for Bank A 1 Enable Read/Write commands for Bank B
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7.PRECHARGE
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
The PRECHARGE command can be asserted anytime after tRAS(min) is satisfied. Soon after the PRECHARGE command is asserted, PRECHARGE operation is performed. The synchronous DRAM enters the idle state after tRP(min) is satisfied. The parameter t RP is the time required to perform the PRECHARGE. The earliest timing in a READ cycle that a PRECHARGE command can be asserted without losing any data in the burst is as followed. PRECHARGE
Burst lengh=4 T0 T1 T2 T3 T4 T5 T6 T7
CLK
Command
Read PRE
CAS latency=2 DQ Hi-Z_
Q0
Q1
Q2
Q3
Command CAS latency=3 DQ
Read
PRE
Hi-Z Q0 Q1 Q2 Q3
CAS latency= 2: One clock earlier than the last output data. 3: Two clocks earlier than the last output data. (tRAS is satisfied)
In order to write all data to the memory cell correctly, the asynchronous parameter”tDPL” must be satisfied. The tDPL(MIN.) specification defines the earliest time that a PRECHARGE command can be asserted after a WRITE cycle. The minimum number of clocks are calculated by dividing tDPL(min.) by the clock cycle time. In summary, the PRECHARGE command can be asserted relative to the reference clock of the last valid data. In the following table, minus means clocks before the reference, plus means time after the reference.
CAS latency 2 3
READ -1 -2
WRITE +tDPL(min.) +tDPL(min)
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8.AUTO PRECHARGE
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
During a READ or WRITE command cycle, A10 controls whether AUTO PRECHARGE is selected. If A10 is high in the READ or WRITE command (READ with AUTO PRECHARGE command or WRITE with AUTO PRECHARGE command), AUTO PRECHARGE is selected and precharging begins automatically after the burst access. In the WRITE cycle, tDAL(min.) must be satisfied to assert the next active command to the bank being precharged. When using AUTO PRECHARGE in the READ cycle, knowing when the PRECHARGE starts is important because the tRAS must be satisfied. Once AUTO PRECHARGE has started, an active command to the bank can be asserted after tRP(min.) has been satisfied. The timing at which the AUTO PRECHARGE cycle begins depends both on the CAS Iatency programmed into the mode register and on whether the cycle is READ or WRITE. 8.1 READ with AUTO PRECHARGE During a READA cycle, the AUTO PRECHARGE begins one clock earlier(CAS Iatency of 2) or two clocks earlier(CAS Iatency of 3) than the last data word output.
READ with AUTO PRECHARGE
Burst lengh=4 T0 T1 T2 T3 T4 T5 T6 T7 T8
CLK
Command
READA B Auto precharge starts
CAS latency=2 DQ Hi-Z
QB0
QB1
QB2
QB3
Auto precharge starts Command READA B
CAS latency=3 DQ QB0 QB1 QB2 QB3 Hi-Z
Remark READA means READ with AUTO PRECHARGE
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8.2 WRITE with AUTO PRECHARGE the device WRITE with AUTO PRECHRGE
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
During a WRITA cycle, the AUTO PRECHARGE starts at tDPL(min.) after the last data word input to
Burst lengh=4 T0 T1 T2 T3 T4 T5 T6 T7 T8
CLK
Command
WRITA B
AUTO PRECHARGE starts tDPL
CAS latency=2
DQ
DB0
DB1
DB2
DB3
Hi-Z_
AUTO PRECHARGE starts Command CAS latency=3 Hi-Z WRITA B tDPL
DQ
DB0
DB1
DB2
DB3
Remark WRITA means WRITE with AUTO PRECHARGE
In summary, the auto precharge cycle begins relative to a reference clock that indicates the last data word is valid. In the table below, minus means clocks before the reference; plus means clocks after the reference.
CAS latency 2 3
READ -1 -2
WRITE +tDPL(min.) +tDPL(min)
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9.READ/WRITE Command Interval 9.1 READ to READ command interval
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
When a new READ command is asserted during a READ cycle, it will be effective after the CAS latency, even if the previous READ operation has not completed. READ will be interrupted by another READ. A READ command can be asserted in every clock without restriction. READ to READ Command Interval
Burst lengh=4, CAS latency=2 T0 T1 T2 T3 T4 T5 T6 T7 T8
CLK Read A Read B
Command
DQ
QA0
QB0
QB1
QB2
QB3
Hi-Z_
1 cycle
9.2 WRITE to WRITE Command Interval When a new WRITE command is asserted during a WRITE cycle, the previous burst will be terminated and the new burst will begin with the new WRITE command. WRITE will be interrupted by another WRITE. A WRITE command can be asserted in every clock without restriction.
WRITE to WRITE Command Interval
Burst lengh=4, CAS latency=2 T0 T1 T2 T3 T4 T5 T6 T7 T8
CLK Write A Write B
Command
DQ
QA0
QB0
QB1
QB2
QB3
Hi-Z_
1 cycle
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WRITE to READ Command Interval
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
9.3 WRITE to READ Command Interval The WRITE command to READ command interval is a minimum of 1 cycle. Only the WRITE data preceding the READ command will be written. The data bus must be in high-impedance at least one cycle prior to the first DOUT.
Burst lengh=4 T0 T1 T2 T3 T4 T5 T6 T7 T8
CLK 1 cycle Command CAS latency=2 Hi-Z WRITE A Read B
DQ
DA0
QB0
QB1
QB2
QB3
Command
Write A
Read B
CAS latency=3 DQ DA0 Hi-Z QB0 QB1 QB2 QB3
9.4 READ to WRITE Command Interval During READ cycle, READ can be interrupted by WRITE. The data bus must be in high-impedance using DQM before the WRITE command. DQM must be high at least 3 clocks prior to the WRITE command. This restriction is necessary to avoid a data bus conflict.
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READ to WRITE Command Interval
T0 T1 T2 T3
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
T4
T5
T6
T7
CAS latency=2 T8
CLK
Command
Read
Write
DQM
DQ
Hi-Z
D0
D1
D2
D3
1 cycle
T0
T1
T2
T3
T4
T5
T6
T7
Burst length=8, CAS latency=2 T8 T9
CLK
Command
Read
Write
DQM
DQ
Q0
Q1
Q2 Hi-Z is necessary
D0
D1
D2
example: Burst length=4, CAS latency=3 T0 T1 T2 T3 T4 T5 T6 T7 T8
CLK
Command
Read
Write
DQM
DQ Q2 Hi-Z is necessary The minimum command interval = (4+1) cycles D0 D1 D2
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10.1 BURST STOP Command
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
10.BURST TERMINATION There are two methods to terminate a BURST operation other than using a READ or a WRITE command. One is the BURST STOP command and the other is the PRECHARGE command.
During a READ BURST. when the BURST STOP command is asserted, the BURST READ outputs are terminated and the data bus goes to high-impedance after the CAS latency from the BURST STOP command. During a WRITE BURST. when the BURST STOP command is asserted, any data provided at that cycle will not be written. The BURST WRITE is effectively terminated and no further data can be written until a new WRITE command is asserted. Burst Termination
T0 T1 T2 T3 T4 T5 Burst lengh=X, CAS Intency=2,3 T7 T6
CLK BST
Command
Read
CAS latency=2 DQ
Q0
Q1
Q2
Hi-Z
CAS latency=3 DQ
Q0
Q1
Q2
Hi-Z
Remark BST: Burst stop command
Burst lengh=X, CAS latency=2,3 T7 T6
T0
T1
T2
T3
T4
T5
CLK BST
Command
Write
CAS latency=2,3 Q0 DQ Q0 Q1 Q2 Hi-Z_
Remark BST: Burst stop command
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10.2 PRECHARGE TERMINATION 10.2.1 PRECHARGE TERMINATION in READ Cycle
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
During a READ cycle, the BURST READ operation can be terminated by a PRECHARGE command. When the PRECHARGE command is asserted, the BURST READ operation is terminated and PRECHARGE starts. Read data will remain valid until one clock(CAS latency of 2)or two clocks(CAS latency of 3) after the PRECHARGE command and the same bank can be activated again after tRP(min) from the PRECHARGE command.
PRECHARGE TERMINATION in READ Cycle
Burst lengh= X T8
T0
T1
T2
T3
T4
T5
T6
T7
CLK
Command
Read
PRE
ACT
CAS latency=2 DQ Q0 Q1 Q2 Q3 tRP command Read PRE tRP Hi-Z ACT Hi-Z
CAS latency=3 DQ
Q0
Q1
Q2
Q3
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10.2.2 PRECHARGE TERMINATION in WRITE Cycle
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
During a WRITE cycle, the BURST WRITE operation can be terminated by a PRECHARGE command. when the PRECHARGE command is asserted, the BURST WRITE operation in immediately terminated and PRECHARGE starts. The same bank can be activated again after tRP(min.) from the PRECHARGE command. The DQM must be high to mask invalid data in. When CAS latency is 2 or 3, the data written prior to the PRECHARGE command will be correctly stored. However, invalid data may be written at the same clock as the PRECHARGE command. To prevent this from happening, DQM must be high at the same clock as the PRECHARGE command. This will mask the invalid data.
PRECHARGE TERMINATION in WRITE Cycle33
T0 T1 T2 T3 T4 T5 T6 T7 Burst lengh = X T8
CLK
Command
Write
PRE
ACT
CAS latency=2 DQM DQ D0 D1 D2 D3 D4 tRP command Write PRE ACT Hi-Z
CAS latency=3 DQM Hi-Z
DQ
D0
D1
D2
D3
D4
tRP
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VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Timing Diagram
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Mode Register Set
T0 T1 T2 T3 T4 T5
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
T6
T7
T8
T9
T10
CLK
CKE
t
RSC
CS
RAS
CAS
WE
A11(BS)
A10
A0-A9
Key
DQM
t
DQ Hi-Z
RP
Precharge Command All Banks
Mode Register Set Command
Command
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AC Parameters for Write Timing (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CL t CH
t CK2 Begin Auto Precharge Begin Auto Precharge Bank A Bank B
CKE
t CKS
t CMS t CMH
t CKH
CS
RAS
CAS
WE
A11(BS)
A10
t AS
RAa
RBa
RAb
RAc
RBb
t
AH
CAa RBa
A0~A9
RAa
CBa
RAb
CAb
RAc
RBb
DDM DQ
t RCD t RRD t RC t DAL t DS t DH t DPL t RP
DAa0 DAa1 DAa2 DAa3 DBa0 DBa1 DBa2 DBa3 DAb0 DAb1 DAb2 DAb3
Activate
Write with
Command Auto Precharge Command Bank A Bank A
Write with Activate Command Auto Precharge Command Bank B Bank B
Activate Command Bank A
Write with Auto Precharge Command Bank A
Precharge Command Bank A
Activate Command Bank A
Activate Command Bank B
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AC Parameters for Write Timing (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6
T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22 T23
CLK
t CL t CH t CKS t CMS t CMH
t CK3 Begin Auto Precharge Bank A Begin Auto Precharge Bank B t CKH
CKE
CS
RAS
CAS
WE
A11(BS)
A10
t AS
RAa tAH
RBa
RAb
RAc
A0~A9
RAa
CAa
RBa
CBa
RAb
CAb
RAc
DDM
tRCD
DQ
t RRD tRC
t DAL
tDS t DH t DPL t RP
DAa0 DAa1 DAa2 DAa3
DBa0 DBa1 DBa2 DBa3
DAb0 DAb1 DAb2 DAb3
Activate Command Bank A
Write with Auto Precharge Command Bank A
Activate Command Bank B
Write with Auto Precharge Command Bank B
Activate Command Bank A
Write without Auto Precharge Command Bank A
Precharge Command Bank A
Activate Command Bank A
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AC Parameters for Read Timing (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=2, CAS Latency=2
T0 CLK
tCH tCL
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
tCK2 tCMS t CMH Begin Auto Precharge Bank B t CKH
CKE
tCKS
CS
RAS
CAS
WE
A11(BS)
A10
RAa tAS tAH
RBa
RAb
A0-A9
RAa
CAa tRRD
RBa
CBa
RAb
tRAS tRC
DQM
t AC2 tLZ tAC2 tOH QAa0
t RCD
tHZ tOH QAa1 QBa0
tRP tHZ QBa1
DQ
Hi-Z
Activate Command Bank A
Read Command Bank A
Activate Command Bank B
Read with Auto Precharge Bank B
Precharge Command Bank A
Activate Command Bank A
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AC Parameters for Read Timing (2 of 2)
T0 CLK T1 T2 T3 T4 T5 T6 T7 T8
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=2, CAS Latency=3
T9
T10
T11
T12
T13
T14 T15
t CH tCL
t CK3 t CMS t CMH Begin Auto Precharge Bank B
CKE
tCKS
t CKH
CS
RAS
CAS
WE
A11(BS)
A10
RAa t AH t AS
RBa
RAb
A0-A9
RAa t RRD
CAa
RBa
CBa
RAb
t RAS t RC
t RP
DQM
t RCD
tAC3 tLZ
tAC3 tOH
tHZ tOH
QAa1 QBa0
t
HZ
DQ
Hi-Z
QAa0
QBa1
Activate Command Bank A
Read Command Bank A
Activate Command Bank B
Read with Auto Precharge Command Bank B
Precharge Command Bank A
Activate Command Bank A
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Power on Sequence and Auto Refresh (CBR)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
High level is required t RSC Minimum of 2 Refresh Cycles are required
CKE
CS
RAS
CAS
WE
A11(BS)
A10
Address Key
A0~A9
DDM
High Level is Necessary t RP t RC
DQ
Inputs Precharge 1st Auto must Command Refresh be stable All Banks Command for 100us
2nd Auto Refresh Command
Mode Command Register Set Command
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Clock Suspension During Burst Read (Using CKE) (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
RAa
CAa
DDM DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3
t HZ
Activate Command Bank A
Read Command Bank A
Clock Suspended 1 Cycle
Clock Suspended 2 Cycles
Clock Suspended 3 Cycles
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Clock Suspension During Burst Read (Using CKE) (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK3
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
RAa
CAa
DDM
t HZ
DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3
Activate Command Bank A
Read Command Bank A
Clock Suspended 1 Cycle
Clock Suspended 2 Cycles
Clock Suspended 3 Cycles
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Clock Suspension During burst Write (Using CKE) (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
RAa
CAa
DDM DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3
Activate Command Bank A
Clock Suspended 1 Cycle Write Command Bank A
Clock Suspended 2 Cycles
Clock Suspended 3 Cycles
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Clock suspension during Burst write (Using CKE) (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK3
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
RAa
CAa
DDM
t
DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3
Activate Command Bank A
Clock Suspended 1 Cycle Write Command Bank A
Clock Suspended 2 Cycles
Clock Suspended 3 Cycles
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Power Down Mode and Clock Mask
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2
t CKS
t CKH
t CKS
CKE
VALID
CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
RAa
CAa
DDM DQ
Hi-Z
QAa0 QAa1 QAa2
t HZ
QAa3
Activate Command Bank A
ACTIVE STANDBY
Read Command Bank A Clock Mask Start Clock Mask End
Precharge Command Power Down Mode Entry
Precharge Standby
Power Down Mode Entry
Power Down Mode Exit
Power Down Mode Exit Command
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Auto Refresh (CBR)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
RAa
CAa
DDM
t RP t RC t RC
Q0 Q1 Q2 Q3
DQ
Hi-Z
Precharge CBR Refresh Command Command All Banks
CBR Refresh Command
Activate Read Command Command
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Self Refresh (Entry and Exit)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t SRX t CKS
t SRX
t PDE
CKE
CS
RAS
CAS
WE
A11(BS)
A10
A0~A9
t RC t
RC
DDM DQ
Hi-Z
All Banks must be idle
Self refresh Entry
Self Refresh Exit
Self Refresh Exit Self Refresh Exit
Activate Command
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Random Column Read (Page Within same Bank)(1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RAd RAa
A0~A9
RAa
CAa
CAb
CAc
RAd
CAd
DDM DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3 QAb0 QAb1 QAc0 QAc1 QAc2 QAc3
QAd0 QAd1 QAd2 QAd3
Precharge Command Bank A
Read Command Bank A
Read Read Command Command Bank A Bank A
Precharge Activate Read Command Command Command Bank A Bank A Bank A
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Random Column Read (Page Within same Bank)(2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK3
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RAd
A0~A9
RAa
CAa
CAb
CAc
RAd
CAd
DDM DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3 QAb0 QAb1 QAc0 QAc1 QAc2 QAc3
Activate Command Bank A
Read Command Bank A
Read Read Command Command Bank A Bank A
Precharge Command Bank A
Activate Command Bank A
Read Command Bank A
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Random Column Write (Page Within same Bank) (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RAd
A0~A9
RBa
CBa
CBb
CBc
RBd
CBd
DDM DQ
Hi-Z
DBa0 DBa1 DBa2 DBa3 DBb0 DBb1 DBc0 DBc1 DBc2 DBc3
DBd0 DBd1 DBd2 DBd3
Activate Command Bank B
Write Command Bank B
Write Write Command Command Bank B Bank B
Precharge Activate Write Command Command Command Bank B Bank B Bank B
Document:1G5-0133
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Random Column Write (Page Within same Bank) (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK3
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RBa
RBd
A0~A9
RBa
CBa
CBb
CBc
CBd
RBd
DDM DQ
Hi-Z
DBa0 DBa1 DBa2 DBa3 DBb0 DBb1 DBc0 DBc1 DBc2 DBc3
DBd0 DBd1 DBd2
Activate Command Bank B
Write Command Bank B
Write Command Bank B
Write Command Bank B
Precharge Command Bank B
Activate Command Bank B
Write Command Bank B
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Random Row Read (Interleaving Banks) (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=8, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2 High
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RBa
RAa
RBb
A0~A9
RBa
CBa
RAa
CAa
RBb
CBb
t
RCD
t AC2
t
RP
DDM DQ
Hi-Z
QBa0 QBa1 QBa2 QBa3 QBa4 QBa5 QBa6 QBa7 QAa0 QAa1 QAa2 QAa3 QAa4 QAa5 QAa6 QAa7
QBb0 QBb1
Activate Command Bank B
Read Command Bank B
Activate Command Bank A
Precharge Active Command Command Bank B Bank B Read Command Bank A
Read Command Bank B
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Random Row Read (Interleaving Banks) (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=8, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK3 High
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RBa
RAa
RBb
A0~A9
RBa
CBa
RAa
CAa
RBb
CBb
t
t RCD
AC3
t
RP
DDM DQ
Hi-Z
QBa0 QBa1 QBa2 QBa3 QBa4 QBa5 QBa6 QBa7 QAa0 QAa1 QAa2 QAa3 QAa4 QAa5 QAa6 QAa7 QBb0
Activate Command Bank B
Read Command Bank B
Activate Command Bank A
Read Command Bank A
Precharge Command Bank B
Activate Command Bank B
Read Precharge Command Command Bank B Bank B
Document:1G5-0133
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Random Row Write (Interleaving Banks) (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=8, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2 High
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
RAb
A0~A9
RAa
CAa
RBa
CBa
RAb
CAb
DDM DQ
Hi-Z
t RCD
t DPL
t
RP
t DPL
QAa0 QAa1 QAa2 QAa3 QAa4 QAa5 QAa6 QAa7 QBa0 QBa1 QBa2 QBa3 QBa4 QBa5 QBa6 QBa7 DAb0 DAb1 DAb2 DAb3 DAb4
Activate Command Bank A
Write Command Bank A
Activate Command Bank B
Precharge Active Command Command Bank A Bank A Write Command Bank B
Write Command Bank A Precharge Command Bank B
Document:1G5-0133
Rev.1
Page 46
VIS
Random Row Write (Interleaving Banks) (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=8, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK3 High
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
R Ab
A0~A9
RAa
CAa
RBa R Ba
CBa
RAb
CAb
DDM DQ
Hi-Z
t RCD
t DPL
t RP
t DPL
DAa0 DAa1 DAa2 DAa3 DAa4 DAa5 DAa6 DAa7 DBa0 DBa1 DBa2 DBa3 DBa4 QBa5 DBa6 DBb7 DAb0 DAb1 DAb2 DAb3
Activate Command Bank A
Write Command Bank A
Activate Command Bank B
Write Command Bank B
Precharge Command Bank A
Activate Command Bank A
Precharge Write Command Command Bank B Bank A
Document:1G5-0133
Rev.1
Page 47
VIS
Read and Write Cycle (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
RAa
C Aa
C Ab
CAc
DQM
Hi-Z
DQ
QAa0 QAa1 QAa2 QAa3
DAb0 DAb1
DAb3
QAc0 QAc1
QAc3
Activate Command Bank A
Write Command Bank A
The Write Data Write Command is Masked with a Bank A Zero Clock latency
Read Command Bank A
The Read Data is Masked with Two Clocks Latency
Document:1G5-0133
Rev.1
Page 48
VIS
Read and Write Cycle (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK3
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
RAa
C Aa
CAb
CAc
DQM
Hi-Z
QAa0 QAa1 QAa2 QAa3
DQ
DAb0 DAb1
DAb3
QAc0 QAc1
QAc3
Activate Command Bank A
Read Command Bank A
Write The Write Data Read Command is Masked with a Command Bank A Bank A Zero Clock
latency
The Read Data is Masked with Two Clock Latency
Document:1G5-0133
Rev.1
Page 49
VIS
Interleaved Column Read Cycle (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
A0~A9
R Aa
CAb
R Ba
C Ba
CBb
C Bc
C Ab
CBd
DQM
t
RCD
t AC2
DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3 QBa0 QBa1 QBb0 QBb1 QBc0 QBc1 QAb0 QAb1 QBd0 QBd1 QBd2 QBd3
Activate Command Bank A
Read Read Read Activate Read Read Read Command Command Command Command Command Command Command Bank A Bank A Bank B Bank B Bank B Bank B Bank B Precharge Command Bank A
Precharge Command Bank B
Document:1G5-0133
Rev.1
Page 50
VIS
Interleaved Column Read Cycle (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK3
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
A0~A9
R Aa
C Aa
R Ba
CBa
CBb
CBc
C Ab
DQM
t RCD t RRD t AC3
DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3 QBa0 QBa1 QBb0 QBb1 QBc0 QBc1 QAb0 QAb1 QAb2 QAb3
Activate Command Bank A
Read Command Bank A Activate Command Bank B
Read Read Read Read Precharge Precharge Command Command Command Command Command Command Bank A Bank B Bank B Bank B Bank B Bank A
Document:1G5-0133
Rev.1
Page 51
VIS
Interleaved Column Write Cycle (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
A0~A9
R Aa
CAa
R Ba
C Ba
CBb
CBc
CAb
CBb
t RCD
t RP
t DPL
DQM
t Hi-Z
DAa0 DAa1 DAa2 DAa3 DBa0 DBa1 DBb0 DBb1 DBc0 DBc1 DAb0 DAb1 DBd0 DBd1 DBd2 DBd3
RRD
DQ
Activate Write Write Write Write Write Activate Command Command Command Command Command Command Command Bank B Bank B Bank A Bank A Bank B Bank B Bank A
Precharge Command Bank A Write Command Bank B
Precharge Command Bank B
Document:1G5-0133
Rev.1
Page 52
VIS
Interleaved Column Write Cycle (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK3
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
A0~A9
R Aa
C Aa
R Ba
CBa
CBb
CBc
C Ab
CBd
t RCD
t DPL
t RP
t DPL
DQM
t Hi-Z
DAa0 DAa1 DAa2 DAa3 DBa0 DBa1 DBb0 DBb1 DBc0 DBc1 DAb0 DAb1 DAd0 QAd1 QAd2 QAd3
RRD
DQ
Activate Command Bank A
Write Command Bank A Activate Command Bank B
Write Write Write Write Write Command Command Command Command Command Bank A Bank B Bank B Bank B Bank B Precharge Command Bank A
Precharge Command Bank B
Document:1G5-0133
Rev.1
Page 53
VIS
Auto Precharge after Read Burst (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
High
t
CK2
Start Auto Precharge Bank B Start Auto Precharge Bank A Start Auto Precharge Bank B
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
R Ba
RBb
RAc
A0~A9
RAa
CAa
R Ba
CBa
CAb
R Bb
CBb
RAc
C Ac
DQM
DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3 QBa0 QBa1 QBa2 QBa3 QAb0 QAb1 QAb2 QAb3 QBb0 QBb1 QBb2 QBb3 QAc0 QAc1 QAc2
Activate Read Activate Read with Command Command Command Auto Precharge Bank A Bank A Bank B Command Bank A
Read with Activate Activate Auto Precharge Command Command Command Bank B Read with Bank A Bank A Auto Precharge Command Read with Bank B Auto Precharge Command Bank A
Document:1G5-0133
Rev.1
Page 54
VIS
Auto Precharge after Read Burst (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
High
t
CK3
Start Auto Precharge Bank B Start Auto Precharge Bank A Start Auto Precharge Bank B
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
R Ba
RBb
A0~A9
R Aa
CAa
RBa
CBa
CAb
RBb
CBb
DQM
DQ
Hi-Z
QAa0 QAa1 QAa2 QAa3 QBa0 QBa1 QBa2 QBa3 QAb0 QAb1 QAb2 QAb3 QBb0 QBb1 QBb2 QBb3
Activate Command Bank A
Read Command Bank A Activate Command Bank B
Read with Auto Precharge Command Bank B
Read with Read with Auto Precharge Auto Precharge Command Command Bank A Bank B Activate Command Bank B
Document:1G5-0133
Rev.1
Page 55
VIS
Auto Precharge after Write Burst (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
High
t
CK2
Start Auto Precharge Bank B Start Auto Precharge Bank A Start Auto Precharge Bank B
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
R Ba
RBb
RAc
A0~A9
R Aa
CAa
RBa
CBa
CAb
RBb
C Bb
RAc
CAc
DQM
DQ
Hi-Z
DAa0 DAa1 DAa2 DAa3 DBa0 DBa1 DBa2 DBa3 DAb0 DAb1 DAb2 DAb3 DBb0 DBb1 DBb2 DBb3 DAc0 DAc1 DAc2 DAc3
Activate Write Write with Activate Command Command Command Auto Precharge Command Bank A Bank B Bank A Bank B
Activate Write with Activate Command Auto Precharge Command Bank A Command Bank B Write with Bank A Write with Auto Precharge Auto Precharge Bank A Command Bank B
Start Auto Precharge Bank A
Document:1G5-0133
Rev.1
Page 56
VIS
Auto Precharge after Write Burst (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
High
t
CK3
Start Auto Precharge Bank B Start Auto Precharge Bank A Start Auto Precharge Bank B
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
R Ba
RBb
A0~A9
R Aa
CAa
RBa
C Ba
C Ab
RBb
CBb
DQM
DQ
Hi-Z
DAa0 DAa1 DAa2 DAa3 DBa0 DBa1 DBa2 DBa3 DAb0 DAb1 DAb2 DAb3 DBb0 DBb1 DBb2 DBb3
Activate Command Bank A
Activate Command Bank B Write Command Bank A
Write with Auto Precharge Command Bank B
Write with Auto Precharge Command Bank A
Activate Command Bank B
Write with Auto precharge Command Bank B
Document:1G5-0133
Rev.1
Page 57
VIS
Full Page Read Cycle (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=Full Page, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2 High
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
R Bb
A0~A9
RAa
CAa
RBa
C Ba
RBb
DDM DQ
Hi-Z
QAa Q Aa+1 QAa+2 QAa-2 QAa-1 QAa QAa+1 QBa QBa+1 QBa+2 QBa+3 QBa+4 QBa+51QBa+6
t RP
Activate Command Bank A
Read Command Bank A
Activate Command Bank B
Read Command Bank B The burst counter wraps from the highest order page address back to zero during this time interval
Full page burst operation does not terminate when the burst length is satisfied; the burst counter increments and continues bursting beginning with the starting address
Precharge Command Bank B Burst Stop Command
Activate Command Bank B
Document:1G5-0133
Rev.1
Page 58
VIS
Full Page Read Cycle (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=Full Page, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK3 High
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
R Bb
A0~A9
RAa
CAa
RBa
CBa
RBb
DDM DQ
Hi-Z
QAa QAa+1 QAa+2 QAa-2 QAa-1 QAa QAa+1 QBa0
t RP
QBa+1 QBa+2 QBa+3 QBa+4 QBa+5
Activate Command Bank A
Read Command Bank A
Activate Command Bank B
Read Command Bank B The burst counter wraps from the highest order page address back to zero during this time interval
Full page burst operation does not teminate when the burst length is satisfied; the burst counter increments and continues bursting beginning with the starting address
Precharge Command Bank B Burst Stop Command
Activate Command Bank B
Document:1G5-0133
Rev.1
Page 59
VIS
Full Page Write Cycle (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=Full Page, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2 High
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
RBb
A0~A9
RAa
CAa
RBa
CBa
RBb
DDM DQ
Hi-Z
DAa DAa+1 DAa+2 DAa+3 DAa-1 DAa DAa+1 DBa DBa+1 DBa+2 DBa+3 DBa+4 DBa+5 DBa+6
t
BDL
Activate Command Bank A
Write Command Bank A
Activate Command Bank B The burst counter wraps from the highest order page address back to zero during this time interval
Write Command Bank B
Data is ignored Precharge Command Bank B Burst Stop Command
Activate Command Bank B
Full page burst operation does not terminate when the burst length is satisfied; the burst counter increments and continues bursting beginning with the starting address
Document:1G5-0133
Rev.1
Page 60
VIS
Full Page Write Cycle (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=Full Page, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK3 High
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RBa
R Bb
A0~A9
RAa
CAa
R Ba
CBa
RBb
DDM DQ
Hi-Z
DAa D Aa+1 DAa+2 DAa+3 DAa-1 DAa DAa+1 DBa
tBDL
DBa+1 DBa+2 DBa+3 DBa+4 DBa+5
Data is ignored.
Activate Command Bank A
Write Command Bank A
Activate Command Bank B The burst counter wraps from the highest order page address back to zero during this time interval
Write Command Bank B Full page burst operation does not terminate when the burst length is satisfied; the burst counter increments and continues bursting beginning with the starting address
Precharge Command Bank B Burst Stop Command
Activate Command Bank B
Document:1G5-0133
Rev.1
Page 61
VIS
Byte Write Operation
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2 High
CKE CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
R Aa
CAa
C Ab
CAz
LDQM
UDQM
Hi-Z
DQ0~DQ7
Hi-Z
DQ8~DQ15
Activate Command Bank A
Read Command Bank A
Upper Byte is masked
Lower Byte is masked
Write Command Bank A
Read Write Upper Command is masked Bank A
Lower Byte is masked
Lower Byte is masked
Document:1G5-0133
Rev.1
Page 62
VIS
Burst Read and Single Write Operation
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2 High
CKE CS
RAS
CAS
WE
A11(BS)
A10
RAa
A0~A9
R Aa
CAa
C Ab
CAc
CAd
CAe
LDQM
UDQM
Hi-Z
DQ0~DQ7
Hi-Z
DQ8~DQ15
Activate Command Bank A
Read Command Bank A
Read Single Write Single Write Command Command Command Bank A Bank A Bank A
Lower Byte is masked Upper Byte is masked
Single Write Command Bank A
Lower Byte is masked
Document:1G5-0133
Rev.1
Page 63
VIS
Full Page Random Column Read
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=Full Page, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
R Ba
RBb
A0~A9
RAa
RBa
CAa
CBa
C Ab
CBb
CAc
CBc
RBb
t RP
DQM
DQ
Hi-Z
QAa0 QBa0 QAb0 QAb1 QBb0 QBb1 QAc0 QAc1 QAc2 QBc0 QBc1 QBc2
Activate Command Bank A
Activate Command Bank B
Read Command Bank B Read Command Bank A
Read Command Bank B
Read Command Bank A
Read Command Bank B
Precharge Command Bank B (Precharge Termination) Activate Command Bank B
Read Command Bank A
Document:1G5-0133
Rev.1
Page 64
VIS
Full Page Random Column Write
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=Full Page, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
R Ba
RBb
A0~A9
RAa
RBa
CAa
CBa
C Ab
CBb
CAc
CBc
RBb
t RP
DQM
DQ
Hi-Z
QAa0 QBa0 QAb0 QAb1 QBb0 QBb1 QAc0 QAc1 QAc2 QBc0 QBc1 QBc2
Activate Command Bank A
Activate Command Bank B
Write Command Bank B Write Command Bank A
Write Command Bank B
Write Command Bank A
Write Command Bank B
Precharge Command Bank B (Precharge Termination) Write Data is masked Activate Command Bank B
Write Command Bank A
Document:1G5-0133
Rev.1
Page 65
VIS
Precharge Termination of a Burst (1 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4,8 or Full Page, CAS Latency=2
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
High
t CK2
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RAb
RAc
A0~A9
RAa
CAa
RAb
CAb
RAc
CAc
t
DPL
t
RP
t
RP
t
RP
DQM
DQ
Hi-Z
QAa0 QAa1 QAa2 Da3 QAb0 QAb1 QAb2 QAc0 QAc1 QAc2
Activate Command Bank A
Write Command Bank A
Precharge Command Bank A
Activate Command Bank A
Read Command Bank A
Precharge Command Bank A
Activate Command Bank A
Read Command Bank A
Precharge Command Bank A
Precharge Termination of a Write Burst. Write data is masked.
Precharge Termination of a Read Burst.
Document:1G5-0133
Rev.1
Page 66
VIS
Precharge Termination of a Burst (2 of 2)
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Burst Length=4,8 or Full Page, CAS Latency=3
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
High
t CK3
CKE
CS
RAS
CAS
WE
A11(BS)
A10
RAa
RAb
RAc
A0~A9
RAa
CAa
RAb
CAb
RAc
t DPL
t
RP
t
RAS
t
RP
DQM
t
RCD
DQ
Hi-Z
DAa0 DAa1 QAb0 QAb1 QAb2 QAb3
Activate Command Bank A
Write Command Bank A
Precharge Command Bank A
Activate Command Bank A
Read Command Bank A
Activate Command Bank A
Activate Command Bank A
Write Data is masked
Precharge Termination of a Write Burst.
Precharge Termination of a Read Burst.
Document:1G5-0133
Rev.1
Page 67
VIS
Ordering information Part Number VG3617801BT-8H VG3617801BT-8L VG3617801BT-10 VG3617801BT-10 • VG
• 36 • 17801 •B •T • 10
VG3617801CT 16Mb CMOS Synchronous Dynamic RAM
Cycle time 10ns 10ns 10ns
Package 400mil 44-Pin Plastic TSOP
• VIS Memory Product • Technology/Design Rule • Device Type/Configuration • Mask/Design Version • Package Type, T: TSOP • Cycle time, 10: 10ns, CL=2,tRP=2,tRCD=2 for PC 66 8L: 10ns, CL=3,tRP=2,tRCD=2 for PC 100 8H: 10ns, CL=2,tRP=2,tRCD=2 for PC 100
Packaging Information
• 400mil, 44-Pin Plastic TSOP
RAD R1 DIM A A1 A2 b b1 c c1 D ZD e E E1 L R R1 11.56 10.03 0.40 0.10 0.10 MILLIMETERS MIN. --0.05 0.95 0.30 0.30 0.12 0.10 18.28 NOM. ----1.00 --------18.41 0.805 REF. 0.80 BASIC 11.76 10.16 0.50 ----11.96 10.29 0.60 0.25 --0.455 0.395 0.016 0.004 0.004 MAX. 1.27 0.15 1.06 0.45 0.40 0.21 0.16 18.54 MIN. --0.002 0.037 0.012 0.012 0.005 0.004 0.720 INCHES NOM. ----0.039 --------0.725 0.0317 REF. 0.0315 BASIC 0.463 0.400 0.020 ----0.471 0.405 0.024 0.010 --DETAIL A ZD NOTE: 1. CONTROLLING DIMENSION : MILLIMETERS 2. DIMENSION D DOES NOT INCLUDE MOLD PROTRUSION. MOLD PROTRUSION SHALL NOT EXCEED 0.15(0.006") PER SIDE. DIMENSION E1 DOES NOT INCLUDE INTERLEAD PROTRUSION. INTERLEAD PROTRUSION SHALL NOT EXCEED 0.25(0.01") PER SIDE. 3. DIMENSION b DOES NOT INCLUDE DAMBAR PROTRUSIONS/INTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL NOT CAUSE THE LEAD TO BE WIDER THAN THE MAX b DIMENSION BY MORE THAN 0.13mm. DAMBAR INTRUSION SHALL NOT CAUSE THE LEAD TO BE NARROWER THAN THE MIN b DIMENSION BY MORE THAN 0.07mm. A MAX. 0.050 0.006 0.042 0.018 0.016 0.008 0.006 0.730 A1 E1 L
44
23
A2
RAD R
B B
c
DETAIL A
b b1
0¢X~5¢X
SECTION B-B
c1 c
1
D
22
BASE METAL WITH PLATING
b
e SEATING PLANE 0.100(0.004)
E
Document:1G5-0133
Rev.1
Page 68
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