SN74LVC16646A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
www.ti.com
SCES408B – AUGUST 2002 – REVISED APRIL 2005
FEATURES
•
•
•
•
•
•
•
•
•
•
DGG, DGV, OR DL PACKAGE
(TOP VIEW)
Member of the Texas Instruments Widebus™
Family
Operates From 1.65 V to 3.6 V
Inputs Accept Voltages to 5.5 V
In Transparent Mode, Max tpd of 5.2 ns
at 3.3 V
Typical VOLP (Output Ground Bounce)
< 0.8 V at VCC = 3.3 V, TA = 25°C
Typical VOHV (Output VOH Undershoot)
> 2 V at VCC = 3.3 V, TA = 25°C
Supports Mixed-Mode Signal Operation on
All Ports (5-V Input/Output Voltage With
3.3-V VCC)
Ioff Supports Partial-Power-Down Mode
Operation
Latch-Up Performance Exceeds 250 mA
Per JESD 17
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 1000-V Charged-Device Model (C101)
1DIR
1CLKAB
1SAB
GND
1A1
1A2
VCC
1A3
1A4
1A5
GND
1A6
1A7
1A8
2A1
2A2
2A3
GND
2A4
2A5
2A6
VCC
2A7
2A8
GND
2SAB
2CLKAB
2DIR
1
56
2
55
3
54
4
53
5
52
6
51
7
50
8
49
9
48
10
47
11
46
12
45
13
44
14
43
15
42
16
41
17
40
18
39
19
38
20
37
21
36
22
35
23
34
24
33
25
32
26
31
27
30
28
29
1OE
1CLKBA
1SBA
GND
1B1
1B2
VCC
1B3
1B4
1B5
GND
1B6
1B7
1B8
2B1
2B2
2B3
GND
2B4
2B5
2B6
VCC
2B7
2B8
GND
2SBA
2CLKBA
2OE
DESCRIPTION/ORDERING INFORMATION
This 16-bit bus transceiver and register is designed for 1.65-V to 3.6-V VCC operation.
The SN74LVC16646A can be used as two 8-bit transceivers or one 16-bit transceiver. The device consists of
bus transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data
directly from the input bus or from the internal registers.
ORDERING INFORMATION
PACKAGE (1)
TA
(1)
TOP-SIDE MARKING
SN74LVC16646ADL
Tape and reel
SN74LVC16646ADLR
TSSOP – DGG
Tape and reel
SN74LVC16646ADGGR
LVC16646A
TVSOP – DGV
Tape and reel
SN74LVC16646ADGVR
LD646A
SSOP – DL
–40°C to 85°C
ORDERABLE PART NUMBER
Tube
LVC16646A
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Widebus is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2002–2005, Texas Instruments Incorporated
SN74LVC16646A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
www.ti.com
SCES408B – AUGUST 2002 – REVISED APRIL 2005
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
Data on the A or B bus is clocked into the registers on the low-to-high transition of the appropriate clock (CLKAB
or CLKBA) input. Figure 1 illustrates the four fundamental bus-management functions that can be performed with
the SN74LVC16646A.
Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver mode,
data present at the high-impedance port can be stored in either register or in both. The select-control (SAB and
SBA) inputs can multiplex stored and real-time (transparent mode) data. The circuitry used for select control
eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and
real-time data. DIR determines which bus receives data when OE is low. In the isolation mode (OE high), A data
can be stored in one register and/or B data can be stored in the other register.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
When an output function is disabled, the input function still is enabled and can be used to store and transmit
data. Only one of the two buses, A or B, can be driven at a time.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
in a mixed 3.3-V/5-V system environment.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE
DATA I/O (1)
INPUTS
(1)
2
OPERATION OR FUNCTION
OE
DIR
CLKAB
CLKBA
SAB
SBA
A1-A8
B1-B8
X
X
↑
X
X
X
Input
Unspecified
Store A, B unspecified (1)
X
X
X
↑
X
X
Unspecified
Input
Store B, A unspecified (1)
H
X
↑
↑
X
X
Input
Input
Store A and B data
H
X
H or L
H or L
X
X
Input
Input
Isolation, hold storage
L
L
X
X
X
L
Output
Input
Real-time B data to A bus
L
L
X
H or L
X
H
Output
Input
Stored B data to A bus
L
H
X
X
L
X
Input
Output
Real-time A data to B Bus
L
H
H or L
X
H
X
Input
Output
Stored A data to bus
The data-output functions can be enabled or disabled by various signals at OE or DIR. Data-input functions always are enabled, i.e.,
data at the bus terminals is stored on every low-to-high transition of the clock inputs.
SN74LVC16646A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
www.ti.com
OE
L
DIR
L
CLKAB CLKBA
X
X
SAB
X
BUS B
BUS A
BUS A
BUS B
SCES408B – AUGUST 2002 – REVISED APRIL 2005
SBA
L
OE
L
DIR
H
DIR
X
X
X
CLKAB CLKBA
↑
X
↑
X
↑
↑
STORAGE FROM
A, B, OR A AND B
SAB
L
SBA
X
BUS B
BUS A
BUS A
OE
X
X
H
CLKBA
X
REAL-TIME TRANSFER
BUS A TO BUS B
BUS B
REAL-TIME TRANSFER
BUS B TO BUS A
CLKAB
X
SAB
SBA
X
X
X
X
X
X
OE
L
L
DIR
L
H
CLKAB
X
H or L
CLKBA
H or L
X
SAB
X
H
SBA
H
X
TRANSFER STORED DATA
TO A AND/OR B
Figure 1. Bus-Management Functions
3
SN74LVC16646A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
www.ti.com
SCES408B – AUGUST 2002 – REVISED APRIL 2005
LOGIC DIAGRAM (POSITIVE LOGIC)
1OE
1DIR
1CLKBA
1SBA
1CLKAB
1SAB
56
1
55
54
2
3
One of Eight Channels
1D
C1
1A1
5
52
1B1
1D
C1
2OE
2DIR
2CLKBA
2SBA
2CLKAB
2SAB
To Seven Other Channels
29
28
30
31
27
26
One of Eight Channels
1D
C1
2A1
15
42
1D
C1
To Seven Other Channels
4
2B1
SN74LVC16646A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
www.ti.com
SCES408B – AUGUST 2002 – REVISED APRIL 2005
Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
VCC
Supply voltage range
–0.5
6.5
V
VI
Input voltage range (2)
–0.5
6.5
V
–0.5
6.5
V
–0.5
VCC + 0.5
state (2)
UNIT
VO
Voltage range applied to any output in the high-impedance or power-off
VO
Voltage range applied to any output in the high or low state (2) (3)
IIK
Input clamp current
VI < 0
–50
mA
IOK
Output clamp current
VO < 0
–50
mA
IO
Continuous output current
±50
mA
±100
mA
Continuous current through each VCC or GND
θJA
Package thermal impedance (4)
Tstg
(1)
(2)
(3)
(4)
DGG package
64
DGV package
48
DL package
56
Storage temperature range
–65
V
°C/W
150
°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.
The value of VCC is provided in the recommended operating conditions table.
The package thermal impedance is calculated in accordance with JESD 51-7.
Recommended Operating Conditions (1)
VCC
Supply voltage
Operating
Data retention only
VCC = 1.65 V to 1.95 V
VIH
High-level input voltage
MIN
MAX
1.65
3.6
1.5
Low-level input voltage
VI
VCC = 2.3 V to 2.7 V
1.7
VCC = 2.7 V to 3.6 V
2
VO
Output voltage
IOH
High-level output current
0.35 × VCC
0.7
VCC = 2.7 V to 3.6 V
0.8
0
5.5
High or low state
0
VCC
3-state
0
5.5
VCC = 1.65 V
–4
VCC = 2.3 V
–8
VCC = 2.7 V
–12
VCC = 3 V
–24
VCC = 1.65 V
IOL
Low-level output current
∆t/∆v
Input transition rise or fall rate
TA
Operating free-air temperature
(1)
V
VCC = 2.3 V to 2.7 V
Input voltage
V
0.65 × VCC
VCC = 1.65 V to 1.95 V
VIL
UNIT
V
V
V
mA
4
VCC = 2.3 V
8
VCC = 2.7 V
12
VCC = 3 V
24
–40
mA
10
ns/V
85
°C
All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
5
SN74LVC16646A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
www.ti.com
SCES408B – AUGUST 2002 – REVISED APRIL 2005
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
IOH = –100 µA
VOH
1.65 V to 3.6 V
1.65 V
1.2
IOH = –8 mA
2.3 V
1.7
2.7 V
2.2
3V
2.4
IOH = –24 mA
3V
2.2
IOL = 100 µA
1.65 V to 3.6 V
0.2
IOL = 4 mA
1.65 V
0.45
IOL = 8 mA
2.3 V
0.7
IOL = 12 mA
2.7 V
0.4
3V
0.55
IOL = 24 mA
II
Control inputs
MAX
VI = 0 to 5.5 V
UNIT
VCC – 0.2
IOH = –4 mA
IOH = –12 mA
VOL
MIN TYP (1)
VCC
V
V
3.6 V
±5
µA
Ioff
VI or VO = 5.5 V
0
±10
µA
IOZ (2)
VO = 0 to 5.5 V
3.6 V
±10
µA
VI = VCC or GND
ICC
3.6 V ≤ VI ≤ 5.5 V (3)
IO = 0
3.6 V
One input at VCC – 0.6 V,
Other inputs at VCC or GND
∆ICC
20
20
2.7 V to 3.6 V
500
µA
µA
Ci
Control inputs
VI = VCC or GND
3.3 V
5
pF
Cio
A or B ports
VO = VCC or GND
3.3 V
8.5
pF
(1)
(2)
(3)
All typical values are at VCC = 3.3 V, TA = 25°C.
For I/O ports, the parameter IOZ includes the input leakage current, but not II(hold).
This applies in the disabled state only.
Timing Requirements
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 2)
VCC = 1.8 V
± 0.15 V
MIN
fclock
Clock frequency
tw
Pulse duration, CLK high or low
tsu
Setup time, A or B before CLKAB↑ or CLKBA↑
th
Hold time, A or B after CLKAB↑ or CLKBA↑
6
MAX
VCC = 2.5 V
± 0.2 V
MIN
85
MAX
VCC = 2.7 V
MIN
125
MAX
VCC = 3.3 V
± 0.3 V
MIN
150
UNIT
MAX
150
MHz
5
4
3.3
3.3
ns
6.5
3.5
3
2.7
ns
0
0
0
0.3
ns
SN74LVC16646A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
www.ti.com
SCES408B – AUGUST 2002 – REVISED APRIL 2005
Switching Characteristics
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
A or B
B or A
fmax
tpd
tdis
ten
tdis
MIN
MAX
85
CLKAB or CLKBA
SAB or SBA
ten
VCC = 1.8 V
± 0.15 V
A or B
OE
A or B
DIR
A or B
VCC = 2.5 V
± 0.2 V
MIN
VCC = 3.3 V
± 0.3 V
VCC = 2.7 V
MAX
125
MIN
MAX
150
MIN
UNIT
MAX
150
MHz
11.3
6.2
6
0.5
5.2
12.4
7.2
7
1.8
6
13.5
7.3
7
1.7
6.1
13
9.5
8.5
1.3
6.9
12
8.5
7.7
2.1
6.9
13
9.5
8.5
1.4
7.2
12
8.5
7.8
2
7
1
1
tsk(o)
1
ns
ns
ns
ns
Operating Characteristics
TA = 25°C
TEST
CONDITIONS
PARAMETER
Cpd
Power dissipation capacitance
per transceiver
Outputs enabled
Outputs disabled
f = 10 MHz
VCC = 1.8 V
VCC = 2.5 V
VCC = 3.3 V
TYP
TYP
TYP
53
55
60
9
10
12
UNIT
pF
7
SN74LVC16646A
16-BIT BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
www.ti.com
SCES408B – AUGUST 2002 – REVISED APRIL 2005
PARAMETER MEASUREMENT INFORMATION
VLOAD
S1
RL
From Output
Under Test
CL
(see Note A)
Open
GND
RL
TEST
S1
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
VLOAD
GND
LOAD CIRCUIT
INPUTS
VCC
1.8 V ± 0.15 V
2.5 V ± 0.2 V
2.7 V
3.3 V ± 0.3 V
VI
tr/tf
VCC
VCC
2.7 V
2.7 V
≤2 ns
≤2 ns
≤2.5 ns
≤2.5 ns
VM
VLOAD
CL
RL
V∆
VCC/2
VCC/2
1.5 V
1.5 V
2 × VCC
2 × VCC
6V
6V
30 pF
30 pF
50 pF
50 pF
1 kΩ
500 Ω
500 Ω
500 Ω
0.15 V
0.15 V
0.3 V
0.3 V
VI
Timing Input
VM
0V
tw
tsu
VI
Input
VM
VM
th
VI
Data Input
VM
VM
0V
0V
VOLTAGE WAVEFORMS
PULSE DURATION
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VI
VM
Input
VM
0V
tPLH
VOH
Output
VM
VOL
tPHL
VM
VM
0V
Output
Waveform 1
S1 at VLOAD
(see Note B)
tPLH
tPLZ
VLOAD/2
VM
tPZH
VOH
Output
VM
tPZL
tPHL
VM
VI
Output
Control
VM
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
Output
Waveform 2
S1 at GND
(see Note B)
VOL + V∆
VOL
tPHZ
VM
VOH - V∆
VOH
≈0 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω.
D. The outputs are measured one at a time, with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
H. All parameters and waveforms are not applicable to all devices.
Figure 2. Load Circuit and Voltage Waveforms
8
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
SN74LVC16646ADGGR
ACTIVE
TSSOP
DGG
56
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
LVC16646A
Samples
SN74LVC16646ADL
ACTIVE
SSOP
DL
56
20
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
LVC16646A
Samples
SN74LVC16646ADLR
ACTIVE
SSOP
DL
56
1000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
LVC16646A
Samples
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of