 74LVQ157

LOW VOLTAGE QUAD 2 CHANNEL MULTIPLEXER

■ HIGH SPEED:
tPD = 5 ns (TYP.) at VCC = 3.3V
■ COMPATIBLE WITH TTL OUTPUT
■ LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
■ LOW NOISE: M T
VOLP = 0.2V (TYP.) at VCC = 3.3V (Micro Package) (TSSOP Package)
■ 75Ω TRANSMISSION LINE OUTPUT DRIVE ORDER CODES :
CAPABILITY 74LVQ157M 74LVQ157T
■ SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 12 mA (MIN)
■ PCI BUS LEVELS GUARANTEED AT 24mA
It has better speed performance at 3.3V than 5V
■ BALANCED PROPAGATION DELAYS:
LSTTL family combined with the true CMOS low
tPLH ≅ tPHL
power consumption.
■ OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 3.6V (1.2VData Retention) It consists of four 2-input digital multiplexers with
■ PIN AND FUNCTION COMPATIBLE WITH common select and strobe inputs. When strobe
74 SERIES 157 input is held high selection of data is inhibit and
■ IMPROVED LATCH-UP IMMUNITY all the outputs become low. The SELECT
decoding determines whether the A or B inputs
DESCRIPTION get routed to their corresponding Y outputs.
The LVQ157 is a low voltage CMOS QUAD All inputs and outputs are equipped with
2-CHANNEL MULTIPLEXER fabricated with protection circuits against static discharge, giving
sub-micron silicon gate and double-layer metal them 2KV ESD immunity and transient excess
wiring C2MOS technology. It is ideal for low voltage.
power and low noise 3.3V applications.

PIN CONNECTION AND IEC LOGIC SYMBOLS

February 1999 1/8

74LVQ157

INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCT ION
1 SELECT Common Data Select Input
2, 5, 11, 14 1A to 4A Data Inputs From
Source A
3, 6, 10, 13 1B to 4B Data Inputs From
Source B
4, 7,9, 12 1Y to 4Y Multiplexer Outputs
15 STROBE Strobe Input
8 GND Ground (0V)
16 VCC Positive Supply Voltage

TRUTH TABLE
INPUT OUT PUT
STROBE SELE CT A B Y
H X X X L
L L L X L
L L H X H
L H X L L
L H X H H
X:”H” or ”L”

ABSOLUTE MAXIMUM RATING

Symbol Parameter Value Unit
VCC Supply Voltage -0.5 to +7 V
VI DC Input Voltage -0.5 to VCC + 0.5 V
VO DC Output Voltage -0.5 to VCC + 0.5 V
IIK DC Input Diode Current ± 20 mA
IOK DC Output Diode Current ± 20 mA
IO DC Output Current ± 50 mA
ICC orIGND DC VCC or Ground Current ± 200 mA
o
Tstg Storage Temperature -65 to +150 C
o
TL Lead Temperature (10 sec) 300 C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Valu e Unit
VCC Supply Voltage (note 1) 2 to 3.6 V
VI Input Voltage 0 to VCC V
VO Output Voltage 0 to VCC V
o
Top Operating Temperature: -40 to +85 C
dt/dv Input Rise and Fall Time (VCC = 3V) (note 2) 0 to 10 ns/V
1) Truth Table guaranteed: 1.2V to 3.6V
2) VIN from 0.8V to 2V

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 74LVQ157

DC SPECIFICATIONS
Symb ol Parameter Test Co nditions Valu e Un it
V CC T A = 25 oC -40 to 85 o C
(V) Min. T yp. Max. Min. Max.
VIH High Level Input Voltage 2.0 2.0 V
3.0 to 3.6
VIL Low Level Input Voltage 0.8 0.8 V
VOH High Level Output 3.0 VI(*) = IO=-50 µA 2.9 2.99 2.9
Voltage VIH or IO=-12 mA 2.58 2.48 V
VIL
IO=-24 mA 2.2
VOL Low Level Output 3.0 VI(*) = IO=50 µA 0.002 0.1 0.1
Voltage VIH or IO=12 mA 0 0.36 0.44 V
VIL
IO=24 mA 0.55
II Input Leakage Current 3.6 VI = VCC orGND ±0.1 ±1 µA
ICC Quiescent Supply 3.6 VI = VCC orGND 4 40 µA
Current
IOLD Dynamic Output Current 3.6 VOLD = 0.8 V max 36 mA
IOHD (note 1, 2) VOHD = 2 V min -25 mA
1) Maximum test duration 2ms, one output loaded attime
2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 Ω.
(*) All outputs loaded.

DYNAMIC SWITCHING CHARACTERISTICS

Symb ol Parameter Test Co nditions Valu e Un it
V CC T A = 25 oC -40 to 85 o C
(V) Min. T yp. Max. Min. Max.
VOLP Dynamic Low Voltage 3.3 0.2 0.8
VOLV Quiet Output (note 1, 2) -0.8 0.2
VIHD Dynamic High Voltage 3.3 CL = 50 pF 2 V
Input (note 1, 3)
VILD Dynamic Low Voltage 3.3 0.8
Input (note 1, 3)
1) Worst case package
2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V, (n -1) outputs switching and one output at GND
3) max number of data inputs (n) switching. (n-1) switching 0V to3.3V. Inputs under test switching: 3.3V to threshold (VILD), 0V to threshold (VIHD). f=1MHz

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74LVQ157

AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf =3 ns)

Symb ol Parameter T est Con ditio n Valu e Un it
V CC T A = 25 oC -40 to 85 o C
(V) Min. T yp. Max. Min. Max.
tPLH Propagation Delay Time 2.7 7.5 15 17
ns
tPHL (SELECT-Y) 3.3(*) 6.5 11 12
tPLH Propagation Delay Time 2.7 7 15 17
ns
tPHL (STROBE-Y) 3.3(*) 6 11 12
tPLH Propagation Delay Time 2.7 6 11 13
(*) ns
tPHL (A,B-Y) 3.3 5 8 9
tOSLH Output to Output Skew 2.7 0.5 1.5 1.5 ns
tOSHL Time (note 1, 2) 3.3(*) 0.5 1.5 1.5
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any twooutputs of the same device switching in the
same direction, either HIGH or LOW (tOSLH = |tPLHm - tPLHn|, tOSHL = |tPHLm - tpHLn|)
2) Parameter guaranteed by design
(*) Voltage range is 3.3V ± 0.3V

CAPACITIVE CHARACTERISTICS
Symb ol Parameter Test Co nditions Valu e Un it
V CC T A = 25 oC -40 to 85 o C
(V) Min. T yp. Max. Min. Max.
CIN Input Capacitance 3.3 5 pF
CPD Power Dissipation 3.3 fIN = 10 MHz 24 pF
Capacitance (note 1)
1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto
Test Circuit).Average operting current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN + ICC/4(per channel)

TEST CIRCUIT

CL = 50 pF or equivalent (includes jigand probe capacitance)

RL = R1 = 500Ω orequivalent
RT = ZOUT of pulse generator (typically 50Ω)

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 74LVQ157

WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS

WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS

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74LVQ157

SO-16 MECHANICAL DATA

mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 1.75 0.068
a1 0.1 0.2 0.004 0.007
a2 1.65 0.064
b 0.35 0.46 0.013 0.018
b1 0.19 0.25 0.007 0.010
C 0.5 0.019
c1 45 (typ.)
D 9.8 10 0.385 0.393
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 8.89 0.350
F 3.8 4.0 0.149 0.157
G 4.6 5.3 0.181 0.208
L 0.5 1.27 0.019 0.050
M 0.62 0.024
S 8 (max.)

P013H

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 74LVQ157

TSSOP16 MECHANICAL DATA

mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.

A 1.1 0.433

A1 0.05 0.10 0.15 0.002 0.004 0.006

A2 0.85 0.9 0.95 0.335 0.354 0.374

b 0.19 0.30 0.0075 0.0118

c 0.09 0.20 0.0035 0.0079

D 4.9 5 5.1 0.193 0.197 0.201

E 6.25 6.4 6.5 0.246 0.252 0.256

E1 4.3 4.4 4.48 0.169 0.173 0.176

e 0.65 BSC 0.0256 BSC

K 0o 4o 8o 0o 4o 8o

L 0.50 0.60 0.70 0.020 0.024 0.028

A A2
K L
A1 b e
c E

E1

PIN 1 IDENTIFICATION
1

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74LVQ157

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 1999 STMicroelectronics – Printed in Italy – All Rights Reserved

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