SN54AHCT540, SN74AHCT540
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCLS268L – DECEMBER 1995 – REVISED JULY 2003
SN54AHCT540 . . . J OR W PACKAGE
SN74AHCT540 . . . DB, DGV, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
Inputs Are TTL-Voltage Compatible
Latch-Up Performance Exceeds 250 mA Per
JESD 17
OE1
A1
A2
A3
A4
A5
A6
A7
A8
V
CC
OE2
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
Y1
Y2
Y3
Y4
– 1000-V Charged-Device Model (C101)
description/ordering information
Y5
The ’AHCT540 octal buffers/drivers are ideal for
driving bus lines or buffer memory address
registers. These devices feature inputs and
outputs on opposite sides of the package to
facilitate printed circuit board layout.
13 Y6
12 Y7
11
GND
Y8
SN54AHCT540 . . . FK PACKAGE
(TOP VIEW)
The 3-state control gate is a two-input AND gate
with active-low inputs so that if either
output-enable (OE1 or OE2) input is high, all
corresponding outputs are in the high-impedance
state. The outputs provide inverted data when
they are not in the high-impedance state.
3
2
1
20 19
18
Y1
Y2
Y3
Y4
Y5
A3
A4
A5
A6
A7
4
5
6
7
8
17
16
15
14
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.
9 10 11 12 13
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP – N
Tube
SN74AHCT540N
SN74AHCT540N
Tube
SN74AHCT540DW
SN74AHCT540DWR
SN74AHCT540NSR
SN74AHCT540DBR
SN74AHCT540PW
SN74AHCT540PWR
SOIC – DW
AHCT540
Tape and reel
Tape and reel
Tape and reel
Tube
SOP – NS
AHCT540
HB540
–40°C to 85°C
SSOP – DB
TSSOP – PW
HB540
Tape and reel
Tape and reel
Tube
TVSOP – DGV
CDIP – J
SN74AHCT540DGVR HB540
SNJ54AHCT540J
SNJ54AHCT540W
SNJ54AHCT540FK
SNJ54AHCT540J
–55°C to 125°C
CFP – W
Tube
SNJ54AHCT540W
SNJ54AHCT540FK
LCCC – FK
Tube
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
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.
Copyright 2003, 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.
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.
1
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