Document
The SN54125, SN54126, SN74125, SN74126, and SN54LS126A are obsolete and are no longer supplied.
SN54125, SN54126, SN54LS125A, SN54LS126A,
SN74125, SN74126, SN74LS125A, SN74LS126A QUADRUPLE BUS BUFFERS WITH 3-STATE OUTPUTS
SDLS044A – DECEMBER 1983 – REVISED MARCH 2002
D Quad Bus Buffers D 3-State Outputs D 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.
SN54125, SN54126, SN54LS125A, SN54LS126A . . . J OR W PACKAGE SN74125, SN74126 . . . N PACKAGE SN74LS125A, SN74LS126A . . . D, N, OR NS PACKAGE
(TOP VIEW)
1G, 1G* 1 1A 2 1Y 3
2G, 2G* 4 2A 5 2Y 6
GND 7
14 VCC 13 4G, 4G* 12 4A 11 4Y 10 3G, 3G* 9 3A 8 3Y
*G on ’125 and ’LS125A devices; G on 126 and ’LS126A devices
SN54LS125A, SN54LS126A . . . FK PACKAGE (TOP VIEW)
1A 1G, 1G* NC VCC 4G, 4G*
1Y NC 2G, 2G* NC 2A
3 2 1 20 19
4
18
5
17
6
16
7
15
8
14
9 10 11 12 13
4A NC 4Y NC 3G, 3G*
2Y GND
NC 3Y 3A
*G on ’125 and ’LS125A devices; G on 126 and ’LS126A devices NC – No internal connection
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.
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 2002, Texas Instruments Incorporated 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.
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SN54125, SN54126, SN54LS125A, SN54LS126A,
SN74125, SN74126, SN74LS125A, SN74LS126A QUADRUPLE BUS BUFFERS WITH 3-STATE OUTPUTS
SDLS044A – DECEMBER 1983 – REVISED MARCH 2002
The SN54125, SN54126, SN74125, SN74126, and SN54LS126A are obsolete and are no longer supplied.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE PART NUMBER
TOP-SIDE MARKING
PDIP – N
Tube Tube
SN74LS125AN SN74LS126AN
SN74LS125AN SN74LS126AN
0°C to 70°C
SOIC – D
Tube Tape and reel Tube Tape and reel
SN74LS125AD SN74LS125ADR SN74LS126AD SN74LS126ADR
LS125A LS126A
SOP – NS
Tape and reel Tape and reel
SN74LS125ANSR SN74LS126ANSR
74LS125A 74LS126A
–55°C to 125°C
CDIP – J CFP – W
Tube Tube Tube
SN54LS125AJ SNJ54LS125AJ SNJ54LS125AW
SN54LS125AJ SNJ54LS125AJ SNJ54LS125AW
LCCC – FK Tube
SNJ54LS125AFK
SNJ54LS125AFK
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
logic diagram (each gate)
’125, ’LS125A G
A
Y
’126, ’LS126A G
A
Y
Y=A
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• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
The SN54125, SN54126, SN74125, SN74126, and SN54LS126A are obsolete and are no longer supplied. schematics (each gate)
4 kW 2.5 kW
SN54125, SN54126, SN54LS125A, SN54LS126A,
SN74125, SN74126, SN74LS125A, SN74LS126A QUADRUPLE BUS BUFFERS WITH 3-STATE OUTPUTS
SDLS044A – DECEMBER 1983 – REVISED MARCH 2002
’125 CIRCUITS
4 kW 2.5 kW
VCC
1 kW
85 W
CONTROL INPUT G
DATA INPUT A
1.6 kW
1.6 kW
4 kW 4.25 kW
2.5 kW
’126 CIRCUITS
4 kW 2.5 kW
4 kW 625 W
OUTPUT Y GND
VCC
1 kW
85 W
CONTROL INPUT G
DATA INPUT A
1.6 kW
1.6 kW
4 kW 625 W
OUTPUT Y GND
absolute maximum ratings over operating free-air temperature (unless otherwise noted)† (’125 and ’126)
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Package thermal impedance, θJA (see Note 2): N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80°C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –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
imp.