IDT74LVC157A
3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS QUADRUPLE
2-LINE TO 1-LINE DATA
SELECTOR/MULTIPLEXER,
5 VOLT TOLERANT I/O
FEATURES:
• 0.5 MICRON CMOS Technology
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• V
CC
= 3.3V ± 0.3V, Normal Range
• V
CC
= 2.7V to 3.6V, Extended Range
• CMOS power levels (0.4μ W typ. static)
μ
• Rail-to-Rail output swing for increased noise margin
• All inputs, outputs, and I/Os are 5V tolerant
• Supports hot insertion
• Available in QSOP, SOIC, SSOP, and TSSOP packages
IDT74LVC157A
DESCRIPTION:
This quadruple 2-line to 1-line data selector/multiplexer is built using
advanced dual metal CMOS technology. The LVC157A features a common
strobe (G) input. When the strobe is high, all outputs are low. When the strobe
is low, a 4-bit word is selected from one of two sources and is routed to the
four outputs. The device provides true data.
Inputs 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 LVC157A has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speed performance.
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
1A
2
4
1B
3
1Y
2A
5
7
2B
6
2Y
3A
11
9
3B
10
3Y
4A
14
12
4B
13
4Y
G
A/B
15
1
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
©2000 Integrated Device Technology, Inc.
FEBRUARY 2000
DSC-4721/2
IDT74LVC157A
3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
A/B
1
A
1
B
1
Y
2
A
2
B
2
Y
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Terminal Voltage with Respect to GND
Storage Temperature
DC Output Current
Continuous Clamp Current,
V
I
< 0 or V
O
< 0
Continuous Current through each
V
CC
or GND
Max
–0.5 to +6.5
–65 to +150
–50 to +50
–50
±100
Unit
V
°C
mA
mA
mA
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
G
4
A
4
B
4
Y
3
A
3
B
3
Y
V
TERM
T
STG
I
OUT
I
IK
I
OK
I
CC
I
SS
GND
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.
QSOP/ SOIC/ SSOP/ TSSOP
TOP VIEW
CAPACITANCE
(T
A
= +25°C, F = 1.0MHz)
Symbol
C
IN
C
OUT
C
I/O
Parameter
(1)
Input Capacitance
Output Capacitance
I/O Port Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
V
IN
= 0V
Typ.
4.5
5.5
6.5
Max.
6
8
8
Unit
pF
pF
pF
NOTE:
1. As applicable to the device type.
PIN DESCRIPTION
Pin Names
A/B
G
xY
xA, xB
Description
Select Input (Active LOW)
Common Strobe Input (Active LOW)
Data Outputs
Data Inputs
FUNCTION TABLE
(1)
Inputs
G
H
L
L
L
L
A/B
X
L
L
H
H
xA
X
L
H
X
X
xB
X
X
X
L
H
Outputs
xY
L
L
H
L
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
2
IDT74LVC157A
3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= –40°C to +85°C
Symbol
V
IH
Parameter
Input HIGH Voltage Level
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
IL
I
IH
I
IL
I
OZH
I
OZL
I
OFF
V
IK
V
H
I
CCL
I
CCH
I
CCZ
ΔI
CC
High Impedance Output Current
(3-State Output pins)
Input/Output Power Off Leakage
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= 0V, V
IN
or V
O
≤
5.5V
V
CC
= 2.3V, I
IN
= –18mA
V
CC
= 3.3V
V
CC
= 3.6V, V
IN
= GND or V
CC
—
—
—
—
—
–0.7
100
—
±50
–1.2
—
10
µA
V
mV
µA
V
CC
= 3.6V
V
O
= 0 to 5.5V
—
—
±10
µA
Input LOW Voltage Level
Input Leakage Current
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 3.6V
V
I
= 0 to 5.5V
Test Conditions
Min.
1.7
2
—
—
—
Typ.
(1)
—
—
—
—
—
Max.
—
—
0.7
0.8
±5
µA
V
Unit
V
Quiescent Power Supply Current
Variation
One input at V
CC
- 0.6V, other inputs at V
CC
or GND
—
—
500
µA
NOTE:
1. Typical values are at V
CC
= 3.3V, +25°C ambient.
OUTPUT DRIVE CHARACTERISTICS
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
= 2.3V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
V
CC
= 3V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
I
OH
= – 24mA
I
OL
= 0.1mA
I
OL
= 6mA
I
OL
= 12mA
I
OL
= 12mA
I
OL
= 24mA
Test Conditions
(1)
V
CC
= 2.3V to 3.6V
I
OH
= – 0.1mA
I
OH
= – 6mA
I
OH
= – 12mA
Min.
V
CC
– 0.2
2
1.7
2.2
2.4
2.2
—
—
—
—
—
Max.
—
—
—
—
—
—
0.2
0.4
0.7
0.4
0.55
V
Unit
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate V
CC
range.
T
A
= – 40°C to + 85°C.
3
IDT74LVC157A
3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
OPERATING CHARACTERISTICS, V
CC
= 3.3V ± 0.3V, T
A
= 25°C
Symbol
C
PD
Parameter
Power Dissipation Capacitance
Test Conditions
C
L
= 0pF, f = 10Mhz
Typical
16
Unit
pF
SWITCHING CHARACTERISTICS
(1)
V
CC
= 2.7V
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
SK
(o)
Parameter
Propagation Delay
xA or xB to xY
Propagation Delay
A/B
to xY
Propagation Delay
G
to xY
Output Skew
(2)
—
—
—
1
ns
—
7.8
1
6.5
ns
Min.
—
—
Max.
5.9
8.1
V
CC
= 3.3V ± 0.3V
Min.
1
1
Max.
5.2
6.8
Unit
ns
ns
NOTES:
1. See TEST CIRCUITS AND WAVEFORMS. T
A
= – 40°C to + 85°C.
2 Skew between any two outputs of the same package and switching in the same direction.
4
IDT74LVC157A
3.3V CMOS QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol
V
LOAD
V
IH
V
T
V
LZ
V
HZ
C
L
V
CC(1)
= 2.5V±0.2V
2 x Vcc
Vcc
Vcc / 2
150
150
30
V
CC
= 3.3V±0.3V & 2.7V
6
2.7
1.5
300
300
50
(2)
SAME PHASE
INPUT TRANSITION
t
PLH
Unit
V
V
V
mV
mV
pF
t
PHL
OUTPUT
t
PLH
OPPOSITE PHASE
INPUT TRANSITION
t
PHL
V
IH
V
T
0V
V
OH
V
T
V
OL
V
IH
V
T
0V
LVC QUAD Link
Propagation Delay
V
CC
500Ω
Pulse
Generator
(1, 2)
V
LOAD
Open
GND
ENABLE
CONTROL
INPUT
t
PZL
OUTPUT
SWITCH
NORMALLY
CLOSED
LOW
t
PZH
OUTPUT
SWITCH
NORMALLY
OPEN
HIGH
V
LOAD/2
V
T
t
PHZ
V
T
0V
t
PLZ
DISABLE
V
IH
V
T
0V
V
LOAD/2
V
LZ
V
OL
V
OH
V
HZ
0V
LVC QUAD Link
V
IN
D.U.T.
R
T
V
OUT
500Ω
C
L
LVC QUAD Link
Test Circuit for All Outputs
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
NOTES:
1. Pulse Generator for All Pulses: Rate
≤
10MHz; t
F
≤
2ns; t
R
≤
2ns.
2. Pulse Generator for All Pulses: Rate
≤
10MHz; t
F
≤
2.5ns; t
R
≤
2.5ns.
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
Enable and Disable Times
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other Tests
Switch
V
LOAD
GND
Open
DATA
INPUT
TIMING
INPUT
SYNCHRONOUS
CONTROL
ASYNCHRONOUS
CONTROL
t
SU
t
H
t
REM
INPUT
t
PLH1
t
PHL1
V
IH
V
T
0V
V
OH
V
T
V
OL
V
OH
V
T
V
OL
t
SU
t
H
V
IH
V
T
0V
V
IH
V
T
0V
V
IH
V
T
0V
V
IH
V
T
0V
LVC QUAD Link
Set-up, Hold, and Release Times
LOW-HIGH-LOW
PULSE
t
W
HIGH-LOW-HIGH
PULSE
V
T
LVC QUAD Link
OUTPUT 1
t
SK
(x)
t
SK
(x)
V
T
OUTPUT 2
t
PLH2
t
PHL2
t
SK
(x)
= t
PLH2
-
t
PLH1
or
t
PHL2
-
t
PHL1
LVC QUAD Link
Output Skew - t
SK
(
X
)
NOTES:
1. For t
SK
(o) OUTPUT1 and OUTPUT2 are any two outputs.
2. For t
SK
(b) OUTPUT1 and OUTPUT2 are in the same bank.
Pulse Width
5
京公网安备 11010802033920号
EEWORLD
