Y
SN54HCT157, SN74HCT157
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
SCLS071B – NOVEMBER 1988 – REVISED MA Y 1997
D
Inputs Are TTL-Voltage Compatible
D
Buffered Inputs and Outputs
D
Package Options Include Plastic
Small-Outline (D) and Ceramic Flat (W)
Packages, Ceramic Chip Carriers (FK), and
Standard Plastic (N) and Ceramic (J)
300-mil DIPs
description
These monolithic data selectors/multiplexers
contain inverters and drivers to supply full data
selection to the four output gates. A separate
strobe (G) input is provided. A 4-bit word is
selected from one of two sources and is routed to
the four outputs.
The SN54HCT157 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74HCT157 is characterized for
operation from –40°C to 85°C.
FUNCTION TABLE
INPUTS
STROBE SELECT
G A/B
H X X X L
L L L XL
L L H XH
L H X LL
L H X H H
DATA
A B
OUTPUT
SN54HCT157 ...J OR W PACKAGE
SN74HCT157 ...D OR N PACKAGE
SN54HCT157 . . . FK PACKAGE
1B
1Y
NC
2A
2B
NC – No internal connection
(TOP VIEW)
A/B
1
1A
2
1B
3
1Y
4
5
2A
6
2B
7
2Y
GND
8
(TOP VIEW)
1A
3212019
4
5
6
7
8
910111213
2Y
A/B
GND
NC
NC
16
15
14
13
12
11
10
9
V
3Y
CC
V
G
4A
4B
4Y
3A
3B
3Y
G
18
17
16
15
14
3B
CC
4A
4B
NC
4Y
3A
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.
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information current as of publication date. Products conform to
specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all
parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1997, Texas Instruments Incorporated
1
SN54HCT157, SN74HCT157
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
SCLS071B – NOVEMBER 1988 – REVISED MA Y 1997
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, N, and W packages.
†
15
A/B
1A
1B
2A
2B
3A
3B
4A
4B
G
1
2
3
5
6
11
10
14
13
EN
G1
1
1
MUX
logic diagram (positive logic)
2
1A
3
1B
12
4
1Y
7
2Y
9
3Y
4Y
4
1Y
5
2A
6
2B
11
3A
10
3B
14
4A
13
4B
15
G
1
A/B
Pin numbers shown are for the D, J, N, and W packages.
12
7
2Y
9
3Y
4Y
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
UNIT
PARAMETER
TEST CONDITIONS
V
UNIT
V
V
V
V
4.5 V
V
V
V
V
V
4.5 V
V
SN54HCT157, SN74HCT157
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
SCLS071B – NOVEMBER 1988 – REVISED MA Y 1997
absolute maximum ratings over operating free-air temperature range
Supply voltage range, V
–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
†
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, IO (VO = 0 to VCC) ±35 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through VCC or GND ±70 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θ
(see Note 2): D package 113°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JA
N package 78°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
†
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.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
recommended operating conditions
SN54HCT157 SN74HCT157
MIN NOM MAX MIN NOM MAX
V
V
V
V
V
t
t
T
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
CC
High-level input voltage VCC = 4.5 V to 5.5 V 2 2 V
IH
Low-level input voltage VCC = 4.5 V to 5.5 V 0 0.8 0 0.8 V
IL
Input voltage 0 V
I
Output voltage 0 V
O
Input transition (rise and fall) time 0 500 0 500 ns
Operating free-air temperature –55 125 –40 85 °C
A
CC
CC
0 V
0 V
CC
CC
V
V
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
CC
=
OH
OL
I
I
I
CC
‡
∆I
CC
C
i
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
‡
This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.
or
I
IH
=
or
I
IH
VI = VCC or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA
VI = VCC or 0, IO = 0 5.5 V 8 160 80 µA
One input at 0.5 V or 2.4 V,
Other inputs at 0 or V
IL
IL
IOH = –20 µA
IOH = –6 mA
IOL = 20 µA
IOL = 6 mA
CC
5.5 V 1.4 2.4 3 2.9 mA
4.5 V
to 5.5 V
TA = 25°C SN54HCT157 SN74HCT157
MIN TYP MAX MIN MAX MIN MAX
4.4 4.499 4.4 4.4
3.98 4.3 3.7 3.84
0.001 0.1 0.1 0.1
0.17 0.26 0.4 0.33
3 10 10* 10 pF
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
SN54HCT157, SN74HCT157
PARAMETER
V
UNIT
A or B
Y
t
A/B
Y
ns
G
Y
ttAn
ns
PARAMETER
V
UNIT
A or B
Y
t
A/B
Y
ns
G
Y
ttAn
ns
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
SCLS071B – NOVEMBER 1988 – REVISED MA Y 1997
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 1)
FROM TO
(INPUT) (OUTPUT)
pd
y
CC
4.5 V 18 28 42 35
5.5 V 15 25 38 32
4.5 V 20 32 48 40
5.5 V 17 29 43 36
4.5 V 18 26 39 33
5.5 V 15 23 35 30
4.5 V 8 15 22 19
5.5 V 7 14 21 17
switching characteristics over recommended operating free-air temperature range, CL = 150 pF
(unless otherwise noted) (see Figure 1)
FROM TO
(INPUT) (OUTPUT)
pd
y
CC
4.5 V 23 42 63 52
5.5 V 19 38 52 46
4.5 V 24 46 72 58
5.5 V 21 41 61 52
4.5 V 21 39 58 48
5.5 V 19 35 49 43
4.5 V 17 42 63 53
5.5 V 14 38 57 48
TA = 25°C SN54HCT157 SN74HCT157
MIN TYP MAX MIN MAX MIN MAX
TA = 25°C SN54HCT157 SN74HCT157
MIN TYP MAX MIN MAX MIN MAX
operating characteristics, TA = 25°C
PARAMETER TEST CONDITIONS TYP UNIT
C
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
Power dissipation capacitance No load 12 pF
pd
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HCT157, SN74HCT157
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
SCLS071B – NOVEMBER 1988 – REVISED MA Y 1997
PARAMETER MEASUREMENT INFORMATION
(see Note B)
From Output
Under Test
LOAD CIRCUIT
NOTES: A. CL includes probe and test-fixture capacitance.
B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.
C. The outputs are measured one at a time with one input transition per measurement.
D. t
PLH
and t
Test
Point
CL = 50 pF
(see Note A)
are the same as tpd.
PHL
Figure 1. Load Circuit and Voltage Waveforms
Input
Output
1.3 V
t
PLH
90% 90%
t
r
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
1.3 V
t
PHL
3 V
0 V
V
1.3 V1.3 V
OH
10%10%
V
OL
t
f
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
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any product or service without notice, and advise customers to obtain the latest version of relevant information
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pertaining to warranty, patent infringement, and limitation of liability.
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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Copyright 1998, Texas Instruments Incorporated
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