SN54BCT125A, SN74BCT125A
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS

SCBS032F – SEPTEMBER 1988 – REVISED MARCH 2003
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
C0068 Operating Voltage Range of 4.5 V to 5.5 V
C0068 State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
C0068 3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1OE
1A
1Y
2OE
2A
2Y
GND
V
CC
4OE
4A
4Y
3OE
3A
3Y
3212019
910111213
4
5
6
7
8
18
17
16
15
14
4A
NC
4Y
NC
3OE
1Y
NC
2OE
NC
2A
1A 1OE NC
3Y 3A
V 4OE
2Y
GND
NC
SN54BCT125A ...FK PACKAGE
(TOP VIEW)
CC
NC – No internal connection
SN54BCT125A ...J OR W PACKAGE
SN74BCT125A . . . D, N, OR NS PACKAGE
(TOP VIEW)
description/ordering information
The ’BCT125A bus buffers feature independent line drivers with 3-state outputs. Each output is disabled when
the associated output-enable (OE) input is high.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
ORDERING INFORMATION
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP – N Tube SN74BCT125AN SN74BCT125AN
0°Cto70°C SOIC D
Tube SN74BCT125AD
BCT125AC to 70 –
Tape and reel SN74BCT125ADR
SOP – NS Tape and reel SN74BCT125ANSR BCT125A
CDIP – J Tube SNJ54BCT125AJ SNJ54BCT125AJ
–55°C to 125°C CFP – W Tube SNJ54BCT125AW SNJ54BCT125AW
LCCC – FK Tube SNJ54BCT125AFK SNJ54BCT125AFK
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
FUNCTION TABLE
(each buffer)
INPUTS
OUTPUT
OE A
Y
L H H
L LL
H X Z

Copyright  2003, Texas Instruments Incorporated
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.
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.