Datasheet
SN54125, SN54126, SN54LS125A, SN54LS126A,
SN74125, SN74126, SN74LS125A, SN74LS126A
QUADRUPLE BUS BUFFERS WITH 3-STATE OUTPUTS
SDLS044A – DECEMBER 1983 – REVISED MARCH 2002
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Quad Bus Buffers
3-State Outputs
Separate Control for Each Channel
description
These bus buffers feature three-state outputs
that, when enabled, have the low impedance
characteristics of a TTL output with additional
drive capability at high logic levels to permit
driving heavily loaded bus lines without external
pullup resistors. When disabled, both output
transistors are turned off, presenting a
high-impedance state to the bus so the output will
act neither as a significant load nor as a driver. The
’125 and ’LS125A devices’ outputs are disabled
when G
is high. The ’126 and ’LS126A devices’
outputs are disabled when G is low.
The SN54125, SN54126, SN74125,
SN74126, and SN54LS126A are
obsolete and are no longer supplied
.
Copyright 2002, Texas Instruments Incorporated
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.
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.
SN54125, SN54126, SN54LS125A,
SN54LS126A . . . J OR W PACKAGE
SN74125, SN74126 ...N PACKAGE
SN74LS125A, SN74LS126A . . . D, N, OR NS PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1G, 1G*
1A
1Y
2G, 2G
*
2A
2Y
GND
V
CC
4G, 4G*
4A
4Y
3G, 3G
*
3A
3Y
3212019
910111213
4
5
6
7
8
18
17
16
15
14
4A
NC
4Y
NC
3G, 3G
*
1Y
NC
2G, 2G
*
NC
2A
1A
1G, 1G*
NC
3Y
3A
4G, 4G*
2Y
GND
NC
V
CC
SN54LS125A, SN54LS126A . . . FK PACKAGE
(TOP VIEW)
*G on ’125 and ’LS125A devices;
G on 126 and ’LS126A devices
NC – No internal connection
*G
on ’125 and ’LS125A devices;
G on 126 and ’LS126A devices
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.