Page 1
QUAD 2 CHANNEL MULTIPLEXER
■ HIGH SPEED:t
■ LOWPOWER DISSIPATION:
=8µA (MAX.) at TA=25oC
I
CC
■ COMPATIBLEWITH TTL OUTPUT S
V
=2V(MIN), VIL= 0.8V (MAX)
IH
■ 50Ω TRANSMISSION LINE DRIVING
CAPABILITY
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
|=IOL=24 mA (MIN)
OH
■ BALANCEDPROPAGATIONDELAYS:
t
≅ t
PLH
PHL
■ OPERATINGVOLTAGERANGE:
V
(OPR)= 4.5V to 5.5V
CC
■ PIN AND FUNCTION COMPATIBLE WITH
74SERIES157
■ IMPROVED LATCH-UPIMMUNITY
DESCRIPTION
The ACT157 is an high-speed CMOS QUAD
2-CHANNEL MULTIPLEXER fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology. It is ideal for low
power applications maintaining high speed
operation similar to equivalent Bipolar Schottky
TTL.
It consistsof four 2-input digital multiplexers with
= 5.5 ns (TYP.)at VCC=5V
PD
74ACT157
PRELIMINARY DATA
B
(Plastic Package)
(Micro Package)
ORDERCODES:
74ACT157B 74ACT157M
common select and strobe inputs. It is a
non-inverting multiplexer. When the STROBE
input is held High selection of data is inhibit and
all the outputs become low. The SELECT
decoding determines whether the A or B inputs
get routed to their correspondingY outputs.
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOSoutput voltagelevels.
All inputs and outputs are equipped with
protectioncircuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
M
PINCONNECTION ANDIEC LOGICSYMBOLS
May 1997
1/8
Page 2
74ACT157
INPUTAND OUTPUT EQUIVALENTCIRCUIT
PIN DESCRIPTION
PI N No SYM B O L NAME A ND FUNC T I ON
1 SELECT Common Data Select Input
2,5,11,14 1Ato4A Data Inputs From
Source A
3,6,10,13 1Bto4B Data Inputs From
Source B
4,7,9,12 1Yto4Y Multiplexer Outputs
15 STROBE Strobe Input
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
TRUTH TABLE
INPUT OUTPUT
ST RO B E SEL ECT A B Y
HXXXL
LLLXL
LLHXH
LHXLL
LHXHH
X:”H”or ”L”
ABSOLUTE MAXIMUM RATING
Symb o l Parame t er Val u e Uni t
V
V
V
I
I
OK
I
orI
I
CC
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
Supply Voltage -0.5to+7 V
CC
DC Input Voltage -0.5toVCC+0.5 V
I
DC Output Voltage -0.5toVCC+0.5 V
O
DC Input Diode Current ± 20 mA
IK
DC Output Diode Current ± 20 mA
DC Output Current ± 50 mA
O
DC VCCor Ground Current ± 200 mA
GND
Storage Temperature -65 to+150
stg
Lead Temperature (10 sec) 300
L
o
C
o
C
RECOMMENDEDOPERATINGCONDITIONS
Symbol Parameter Valu e Unit
V
V
V
T
dt/dv Input Rise and Fall Time V
1) VINfrom0.8Vto2.0V
Supply Voltage 4.5to5.5 V
CC
Input Voltage 0toV
I
Output Voltage 0toV
O
Operating Temperature: -40to+85
op
= 4.5 to 5.5V (note 1) 8 ns/V
CC
CC
CC
V
V
o
C
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Page 3
DC SPECIFICATIONS
74ACT157
Symbol Parameter Test Condition s Value Unit
=25oC-40to85
V
CC
(V)
High Level Input Voltage 4.5 VO=0.1 Vor
V
IH
5.5 2.0 1.5 2.0
Low Level Input Voltage 4.5 VO=0.1 Vor
V
IL
5.5 1.5 0.8 0.8
High Level Output
V
OH
Voltage
4.5
5.5 I
4.5 I
5.5 I
Low Level Output
V
OL
Voltage
4.5
5.5 I
4.5 I
5.5 I
Input Leakage Current
I
I
Max ICC/Input 5.5 VI=VCC-2.1V 0.6 1.5 mA
I
CCT
Quiescent Supply
I
CC
5.5
5.5 VI=VCCorGND 8 80 µA
V
-0.1 V
CC
-0.1 V
V
CC
IO=-50µA 4.4 4.49 4.4
(*)
=
V
I
or
V
IH
V
IL
(*)
V
I
V
or
IH
V
IL
=-50µA 5.4 5.49 5.4
O
=-24 mA 3.86 3.76
O
=-24 mA 4.86 4.76
O
IO=50µA0.0010.1 0.1
=
=50 mA 0.001 0.1 0.1
O
=24mA 0.36 0.44
O
=24mA 0.36 0.44
O
VI=VCCorGND ±0.1 ±1 µA
T
A
Min. Typ. Max. Min. Max.
2.0 1.5 2.0
1.5 0.8 0.8
o
C
Current
Dynamic Output Current
I
OLD
(note 1, 2)
I
OHD
1) Maximum test duration 2ms, one output loaded at time
2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 Ω.
(*)All outputs loaded.
5.5 V
=1.65 Vmax 75 mA
OLD
V
=3.85Vmin -75 mA
OHD
V
V
V
V
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Page 4
74ACT157
AC ELECTRICAL CHARACTERISTICS (C
= 50 pF, RL=500 Ω, Inputtr=tf=3ns)
L
Symbol Parameter Test Cond ition Value Unit
o
C
t
Propagation Delay Time
PLH
t
SELECT to Y
PHL
Propagation Delay Time
t
PLH
t
STROBE to Y
PHL
Propagation Delay Time
t
PLH
t
A, B to Y
PHL
(*)Voltage range is 5V ± 0.5V
V
(V)
5.0
5.0
5.0
CC
=25oC-40to85
T
A
Min. Typ. Max. Min. Max.
(*)
(*)
(*)
1.5 5.5 9.0 1.0 10.0 ns
1.55.08.51.09.0 ns
1.54.07.01.08.5 ns
CAPACITIVE CHARACTERISTICS
Symbol Parameter Test Condition s Value Unit
=25oC-40to85
T
A
Min. Typ. Max. Min. Max.
4
Input Capacitance
C
IN
Power Dissipation
C
PD
V
CC
(V)
5.0
5.0 TDB pF
Capacitance (note 1)
1) CPDis defined as the value of the IC’s internalequivalent capacitance which is calculated from the operating current consumption without load. (Refer to
Test Circuit). Average operating current can be obtained by the following equation. I
(opr) = CPD• VCC• fIN+ICC/n (per circuit)
CC
o
C
pF
TEST CIRCUIT
4/8
Page 5
WAVEFORM 1: PROPAGATIONDELAYS FOR INVERTINGCONDITIONS
74ACT157
WAVEFORM 2: PROPAGATIONDELAYS FOR NON-INVERTING CONDITIONS
5/8
Page 6
74ACT157
Plastic DIP-16 (0.25) MECHANICALDATA
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
a1 0.51 0.020
B 0.77 1.65 0.030 0.065
b 0.5 0.020
b1 0.25 0.010
D 20 0.787
E 8.5 0.335
e 2.54 0.100
e3 17.78 0.700
F 7.1 0.280
I 5.1 0.201
L 3.3 0.130
Z 1.27 0.050
mm inch
6/8
P001C
Page 7
SO-16 MECHANICAL DATA
74ACT157
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.)
mm inch
P013H
7/8
Page 8
74ACT157
Information furnished is believed to be accurateand reliable. However,SGS-THOMSON Microelectronics assumes no responsability for the
consequencesof use ofsuch informationnor for any infringement of patentsor other rights of third parties whichmay resultsfrom its use. No
licenseis grantedby implicationor otherwise underany patent or patentrightsof SGS-THOMSONMicroelectronics. Specificationsmentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previouslysupplied.
SGS-THOMSONMicroelectronics productsarenotauthorized for useas criticalcomponents in life supportdevices or systemswithoutexpress
writtenapproval of SGS-THOMSON Microelectonics.
1997 SGS-THOMSONMicroelectronics - Printed in Italy- All Rights Reserved
Australia- Brazil - Canada - China- France- Germany- Hong Kong- Italy- Japan- Korea- Malaysia- Malta- Morocco- TheNetherlands -
Singapore- Spain- Sweden- Switzerland - Taiwan - Thailand - UnitedKingdom- U.S.A
SGS-THOMSONMicroelectronics GROUPOF COMPANIES
.
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