SN54F157A, SN74F157A
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
SDFS053A – MARCH 1987 – REVISED OCTOBER 1993
Copyright 1993, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• Buffered Inputs and Outputs
• Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
The ′F157A is a quadruple 2-input data
selector/multiplexer featuring 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 ′F157A provides true data.
The SN54F157A is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74F157A is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OUTPUT
G A/B A B
Y
H X X X L
L LLX L
LLHX H
LHXL L
LHXH H
SN54F157A ...J PACKAGE
SN74F157A ...D OR N PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
4A
4B
NC
4Y
3A
1B
1Y
NC
2A
2B
SN54F157A . . . FK PACKAGE
(TOP VIEW)
1A
A/B
NC
3Y
3B
G
2Y
GND
NC
NC – No internal connection
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A/B
1A
1B
1Y
2A
2B
2Y
GND
V
CC
G
4A
4B
4Y
3A
3B
3Y
PRODUCTION DATA information is 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.
SN54F157A, SN74F157A
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
SDFS053A – MARCH 1987 – REVISED OCT OBER 1993
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
logic diagram (positive logic)
G
MUX
2
1A
1
3
1B
EN
15
G1
1
1Y
4
5
2A
6
2B
2Y
7
11
3A
10
3B
3Y
9
14
4A
13
4B
4Y
12
A/B
4Y
3Y
2Y
1Y
12
9
7
4
A
/B
G
4B
4A
3B
3A
2B
2A
1B
1A
1
15
13
14
10
11
6
5
3
2
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
1
Pin numbers shown are for the D, J, and N packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage range, V
CC
–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range (see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input current range –30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state –0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state 40 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54F157A –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F157A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
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.
NOTE 1: The input voltage rating may be exceeded provided that the input current rating is observed.
recommended operating conditions
SN54F157A SN74F157A
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.8 0.8 V
I
IK
Input clamp current –18 –18 mA
I
OH
High-level output current –1 –1 mA
I
OL
Low-level output current 20 20 mA
T
A
Operating free-air temperature –55 125 0 70 °C
SN54F157A, SN74F157A
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
SDFS053A – MARCH 1987 – REVISED OCTOBER 1993
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54F157A SN74F157A
PARAMETER
TEST CONDITIONS
MIN TYP†MAX MIN TYP†MAX
UNIT
V
IK
VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
VCC = 4.5 V, IOH = – 1 mA 2.5 3.4 2.5 3.4
V
OH
VCC = 4.75 V , IOH = – 1 mA 2.7
V
V
OL
VCC = 4.5 V, IOL = 20 mA 0.3 0.5 0.3 0.5 V
I
I
VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
I
IH
VCC = 5.5 V, VI = 2.7 V 20 20 µA
I
IL
VCC = 5.5 V, VI = 0.5 V – 0.6 – 0.6 mA
I
OS
‡
VCC = 5.5 V, VO = 0 –60 –150 –60 –150 mA
I
CC
VCC = 5.5 V, VI = 4.5 V 15 23 15.5 23 mA
†
All typical values are at VCC = 5 V, TA = 25°C.
‡
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
switching characteristics (see Note 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
RL = 500 Ω,
TA = 25°C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500Ω,
TA = MIN to MAX
§
UNIT
()
()
′F157A SN54F157A SN74F157A
MIN TYP MAX MIN MAX MIN MAX
t
PLH
3.2 6.6 10 3.2 12 3.2 11
t
PHL
A/B
Y
2.2 4.6 7 2.2 9 2.2 8
ns
t
PLH
4.2 6.6 9.5 4.2 13 4.2 11
t
PHL
G
Y
1.7 4.1 6.5 1.7 7.5 1.7 7
ns
t
PLH
1.7 4.1 6 1.7 7.5 1.7 6.5
t
PHL
A or B
Y
1.7 3.6 5.5 1 7.5 1.2 7
ns
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.
SN54F157A, SN74F157A
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
SDFS053A – MARCH 1987 – REVISED OCT OBER 1993
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
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.
CERT AIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICA TIONS IS UNDERST OOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1998, Texas Instruments Incorporated
Loading...