IDT74LVCH16646A
3.3V CMOS 16-BIT BUS TRANSCEIVER/REGISTER
INDUSTRIAL TEMPERATURE RANGE
IDT74LVCH16646A
3.3V CMOS 16-BIT BUS
NOT RECOMMENDED
TRANSCEIVER/REGISTER
FOR NEW DESIGNS
WITH 3-STATE OUTPUTS,
5 VOLT TOLERANT I/O AND BUS-HOLD
FEATURES:
DESCRIPTION:
• Typical tSK(o) (Output Skew) < 250ps
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• VCC = 3.3V ± 0.3V, Normal Range
• VCC = 2.7V to 3.6V, Extended Range
μ W typ. static)
• CMOS power levels (0.4μ
• All inputs, outputs, and I/O are 5V tolerant
• Supports hot insertion
• Available in TSSOP package
The LVCH16646A 16-bit bus transceiver and register is built using
advanced dual metal CMOS technology. This high-speed, low power
device is organized as two independent 8-bit D-type transceivers with 3state D-type registers.The controls circuitry is organized for multiplexed
transmission of data between A bus and B bus either directly or from the
internal storage registers. Each 8-bit transceiver/register features direction
control (DIR), over-riding Output Enable control (OE) and Select lines (SAB
and SBA) to select either real- time data or stored data. Separate clock inputs
are provided for A and B port registers. Data on the A or B data bus, or both,
can be stored in the internal registers by the low-to-high transitions at the
appropriate clock pins. Flow-through organization of signal pins simplifies
layout. All inputs are designed with hysteresis for improved noise margin.
All pins can be driven from either 3.3V or 5V devices. This feature allows
the use of this device as a translator in a mixed 3.3V/5V supply system.
The LVCH16646A has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speed performance.
The LVCH16646A has “bus-hold” which retains the inputs’ last state
whenever the input goes to a high impedance. This prevents floating inputs
and eliminates the need for pull-up/down resistors.
DRIVE FEATURES:
• High Output Drivers: ±24mA
• Reduced system switching noise
APPLICATIONS:
• 5V and 3.3V mixed voltage systems
• Data communication and telecommunication systems
FUNCTIONAL BLOCK DIAGRAM
29
56
2OE
1OE
1DIR
1
1CLKBA
2CLKBA
54
1SBA
2SBA
2
1CLKAB
2CLKAB
3
1SAB
28
2DIR
55
2SAB
30
31
27
26
1D
1D
One of Eight Channels
1A1
C1
5
One of Eight Channels
52
1B1 2A1
C1
15
42
2B1
1D
1D
C1
C1
TO SEVEN OTHER CHANNELS
TO SEVEN OTHER CHANNELS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
JANUARY 2016
DSC-3787/5
IDT74LVCH16646A
3.3V CMOS 16-BIT BUS TRANSCEIVER/REGISTER
INDUSTRIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS(1)
PIN CONFIGURATION
Symbol
1DIR
1
56
1OE
1CLKAB
2
55
1CLKBA
1SAB
3
54
1SBA
GND
4
53
GND
1A1
5
52
1B1
51
1B2
1A2
6
VCC
7
50
VCC
1A3
8
49
1B3
1A4
9
48
1B4
1A5
10
47
1B5
GND
11
46
GND
1A6
12
45
1B6
1A7
13
44
1B7
1A8
14
43
1B8
2A1
15
42
2B1
16
41
2B2
17
40
GND
18
39
2B3
GND
2A4
19
38
2B4
2A5
20
37
2B5
2A6
21
36
2B6
VCC
22
35
VCC
2A7
23
34
2B7
2A8
24
33
2B8
GND
25
32
GND
2SAB
26
31
2SBA
2CLKAB
27
30
2CLKBA
2DIR
28
29
2OE
2A2
2A3
Description
Max
Unit
VTERM
Terminal Voltage with Respect to GND
–0.5 to +6.5
V
TSTG
Storage Temperature
–65 to +150
°C
IOUT
DC Output Current
–50 to +50
mA
IIK
IOK
Continuous Clamp Current,
VI < 0 or VO < 0
–50
mA
ICC
ISS
Continuous Current through each
VCC or GND
±100
mA
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
CAPACITANCE (TA = +25°C, F = 1.0MHz)
Parameter(1)
Symbol
Conditions
Typ.
Max.
Unit
CIN
Input Capacitance
VIN = 0V
4.5
6
pF
COUT
Output Capacitance
VOUT = 0V
6.5
8
pF
CI/O
I/O Port Capacitance
VIN = 0V
6.5
8
pF
NOTE:
1. As applicable to the device type.
PIN DESCRIPTION
Pin Names
xAx
Description
Data Register A Inputs(1)
Data Register B Outputs
xBx
Data Register B Inputs(1)
Data Register A Outputs
xCLKAB, xCLKBA
xSAB, xSBA
Clock Pulse Inputs
Output Data Source Select Inputs
xOE
Output Enable Inputs
xDIR
Direction Control Inputs
NOTE:
1. These pins have "Bus-Hold". All other pins are standard inputs, outputs, or I/Os.
TSSOP
TOP VIEW
2
IDT74LVCH16646A
3.3V CMOS 16-BIT BUS TRANSCEIVER/REGISTER
INDUSTRIAL TEMPERATURE RANGE
FUNCTION TABLE(1)
Inputs
Data I/O
(2)
xOE
xDIR
xCLKAB
xCLKBA
xSAB
xSBA
xAx
xBx
Operation or Function
X
X
↑
X
X
X
Input
Unspecified
Store A, B unspecified(2)
X
X
X
↑
X
X
Unspecified
Input
Store B, A unspecified(2)
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 B bus
NOTES:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
↑ = LOW-to-HIGH transition
2. The data output functions may be enabled or disabled by various signals at the xOE or xDIR inputs. Data input functions are always enabled, i.e. data at the bus pins will
be stored on every LOW-to-HIGH transition of the clock inputs.
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = –40°C to +85°C
Symbol
VIH
VIL
Min.
Typ.(1)
Max.
Unit
VCC = 2.3V to 2.7V
1.7
—
—
V
VCC = 2.7V to 3.6V
2
—
—
VCC = 2.3V to 2.7V
—
—
0.7
VCC = 2.7V to 3.6V
—
—
0.8
Parameter
Input HIGH Voltage Level
Input LOW Voltage Level
Test Conditions
V
Input Leakage Current
VCC = 3.6V
VI = 0 to 5.5V
—
—
±5
μA
IOZH
High Impedance Output Current
VCC = 3.6V
VO = 0 to 5.5V
—
—
±10
μA
IOZL
(3-State Output pins)
IOFF
Input/Output Power Off Leakage
VCC = 0V, VIN or VO ≤ 5.5V
—
—
±50
μA
VIK
Clamp Diode Voltage
VCC = 2.3V, IIN = –18mA
—
–0.7
–1.2
V
VH
ICCL
ICCH
ICCZ
ΔICC
Input Hysteresis
Quiescent Power Supply Current
VCC = 3.3V
VCC = 3.6V
VIN = GND or VCC
—
—
100
—
—
10
mV
μA
3.6 ≤ VIN ≤ 5.5V(2)
One input at VCC - 0.6V, other inputs at VCC or GND
—
—
—
—
10
500
μA
IIH
IIL
Quiescent Power Supply Current
Variation
NOTES:
1. Typical values are at VCC = 3.3V, +25°C ambient.
2. This applies in the disabled state only.
3
IDT74LVCH16646A
3.3V CMOS 16-BIT BUS TRANSCEIVER/REGISTER
BUS
A
xDIR
L
xOE
L
INDUSTRIAL TEMPERATURE RANGE
BUS
A
BUS
B
xCLKAB
X
xCLKBA
X
xSAB
X
xSBA
L
xDIR
H
xOE
L
xDIR
X
X
X
xOE
X
X
H
xCLKBA
X
xCLKBA
X
BUS
A
BUS
B
xCLKAB
X
xCLKAB
X
xSAB
L
xSBA
X
Real-Time Transfer
Bus A to B
Real-Time Transfer
Bus B to A
BUS
A
BUS
B
xSAB
X
X
X
xSBA
X
X
X
xDIR
L
H
Storage from
A, B, or A and B
BUS
B
xOE
L
L
xCLKAB
X
H or L
xCLKBA
H or L
X
Transfer Stored
Data to A and/or B
4
xSAB
X
H
xSBA
H
X
IDT74LVCH16646A
3.3V CMOS 16-BIT BUS TRANSCEIVER/REGISTER
INDUSTRIAL TEMPERATURE RANGE
BUS-HOLD CHARACTERISTICS
Symbol
IBHH
Parameter(1)
Bus-Hold Input Sustain Current
VCC = 3V
Bus-Hold Input Sustain Current
VCC = 2.3V
IBHL
IBHHO
Typ.(2)
Max.
Unit
– 75
—
—
μA
VI = 0.8V
75
—
—
VI = 1.7V
—
—
—
VI = 0.7V
—
—
—
VI = 0 to 3.6V
—
—
±500
VI = 2V
IBHL
IBHH
Min.
Test Conditions
Bus-Hold Input Overdrive Current
VCC = 3.6V
μA
μA
IBHLO
NOTES:
1. Pins with Bus-Hold are identified in the pin description.
2. Typical values are at VCC = 3.3V, +25°C ambient.
OUTPUT DRIVE CHARACTERISTICS
Symbol
VOH
VOL
Test Conditions(1)
Parameter
Output HIGH Voltage
Output LOW Voltage
Min.
Max.
Unit
V
VCC = 2.3V to 3.6V
IOH = – 0.1mA
VCC – 0.2
—
VCC = 2.3V
IOH = – 6mA
2
—
VCC = 2.3V
IOH = – 12mA
1.7
—
VCC = 2.7V
2.2
—
VCC = 3V
2.4
—
VCC = 3V
IOH = – 24mA
2
—
VCC = 2.3V to 3.6V
IOL = 0.1mA
—
0.2
VCC = 2.3V
IOL = 6mA
—
0.4
IOL = 12mA
—
0.7
VCC = 2.7V
IOL = 12mA
—
0.4
VCC = 3V
IOL = 24mA
—
0.55
V
NOTE:
1. VIH and VIL must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate VCC range.
TA = – 40°C to + 85°C.
OPERATING CHARACTERISTICS, VCC = 3.3V ± 0.3V, TA = 25°C
Symbol
Parameter
CPD
Power Dissipation Capacitance per Transceiver Outputs enabled
CPD
Power Dissipation Capacitance per Transceiver Outputs disabled
Test Conditions
Typical
Unit
CL = 0pF, f = 10Mhz
60
pF
12
5
IDT74LVCH16646A
3.3V CMOS 16-BIT BUS TRANSCEIVER/REGISTER
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS(1)
VCC = 2.7V
Symbol
Parameter
fMAX
tPLH
Propagation Delay
tPHL
xAx to xBx or xBx to xAx
tPLH
Propagation Delay
tPHL
xCLKBA or xCLKAB to xAx or xBx
tPLH
Propagation Delay
tPHL
xSBA or xSAB to xAx or xBx
tPZH
Output Enable Time
tPZL
xOE to xAx or Bx
tPZH
Output Enable Time
tPZL
xDIR to xAx or Bx
tPHZ
Output Disable Time
tPLZ
xOE to xAx or Bx
tPHZ
Output Disable Time
tPLZ
xDIR to xAx or Bx
tSU
Set-up Time
VCC = 3.3V ± 0.3V
Min.
Max.
Min.
Max.
Unit
150
—
150
—
MHz
—
6.8
1.3
5.7
ns
—
7.9
1.8
6.7
ns
—
9.2
1.7
7.7
ns
—
8.5
1.3
6.9
ns
—
8.5
1.4
7.2
ns
—
7.7
2.1
6.9
ns
—
7.8
2
7
ns
3.2
—
2.9
—
ns
0
—
0.3
—
ns
xAx or xBx before CLKAB↑ or CLKBA↑
tH
Hold Time
xAx or xBx after CLKAB↑ or CLKBA↑
tW
tSK(o)
Pulse Duration, CLK HIGH or LOW
3.3
—
3.3
—
ns
Output Skew(2)
—
—
—
500
ps
NOTES:
1. See TEST CIRCUITS AND WAVEFORMS. TA = – 40°C to + 85°C.
2. Skew between any two outputs of the same package and switching in the same direction.
6
IDT74LVCH16646A
3.3V CMOS 16-BIT BUS TRANSCEIVER/REGISTER
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol
VCC(1)= 3.3V±0.3V VCC(1)= 2.7V
VCC(2)= 2.5V±0.2V
Unit
VLOAD
6
6
2 x Vcc
V
VIH
2.7
2.7
Vcc
V
VT
1.5
1.5
Vcc / 2
V
VLZ
300
300
150
mV
VHZ
300
300
150
mV
CL
50
50
30
pF
VIN
tPLH
tPHL
VIH
VT
0V
LVC Link
Propagation Delay
DISABLE
ENABLE
VIH
VT
0V
CONTROL
INPUT
tPZL
GND
VOUT
OUTPUT
SWITCH
NORMALLY
CLOSED
LOW
tPZH
OUTPUT SWITCH
NORMALLY
OPEN
HIGH
D.U.T.
500
RT
tPHL
OPPOSITE PHASE
INPUT TRANSITION
Open
500
tPLH
OUTPUT
VLOAD
VCC
Pulse (1, 2)
Generator
VIH
VT
0V
VOH
VT
VOL
SAME PHASE
INPUT TRANSITION
CL
tPLZ
VLOAD/2
VT
VLOAD/2
VLZ
VOL
tPHZ
VOH
VHZ
0V
VT
0V
LVC Link
LVC Link
Test Circuit for All Outputs
Enable and Disable Times
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
NOTES:
1. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.
2. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2ns; tR ≤ 2ns.
DATA
INPUT
SWITCH POSITION
Test
Switch
TIMING
INPUT
Open Drain
Disable Low
Enable Low
VLOAD
ASYNCHRONOUS
CONTROL
Disable High
Enable High
GND
SYNCHRONOUS
CONTROL
All Other Tests
Open
INPUT
OUTPUT 1
tPLH1
tSK (x)
tSK (x)
tPLH2
tREM
tSU
tH
LOW-HIGH-LOW
PULSE
VOH
VT
VOL
LVC Link
VT
tW
HIGH-LOW-HIGH
PULSE
VOH
VT
VOL
OUTPUT 2
tH
Set-up, Hold, and Release Times
VIH
VT
0V
tPHL1
tSU
VIH
VT
0V
VIH
VT
0V
VIH
VT
0V
VIH
VT
0V
VT
LVC Link
Pulse Width
tPHL2
tSK(x) = tPLH2 - tPLH1 or tPHL2 - tPHL1
LVC Link
Output Skew - tSK(X)
NOTES:
1. For tSK(o) OUTPUT1 and OUTPUT2 are any two outputs.
2. For tSK(b) OUTPUT1 and OUTPUT2 are in the same bank.
7
IDT74LVCH16646A
3.3V CMOS 16-BIT BUS TRANSCEIVER/REGISTER
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
X
LVC
XX
Bus-Hold
Temp. Range
XX
Family
XX
XXXX
Device Type Package
X
Blank
8
Tube or Tray
Tape and Reel
PAG
Thin Shrink Small Outline Package - Green
646A
16-Bit Bus Transceiver/Register with
3-State Outputs and 5 Volt Tolerant I/O
16
Double-Density, ±24mA
H
Bus-hold
74
-40°C to +85°C
DATASHEET DOCUMENT HISTORY
01/28/2016
Pg. 1, 2, 8
Updated the ordering information by removing IDT notation, non RoHS parts and adding Tape and Reel information.
8
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