Datasheet

SN54HCT540, SN74HCT540
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SCLS008C – MARCH 1984 – REVISED MARCH 2003
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Operating Voltage Range of 4.5 V to 5.5 V
Low Power Consumption, 80-µA Max I
CC
Typical t
pd
= 12 ns
±6-mA Output Drive at 5 V
Low Input Current of 1 µA Max
Inputs Are TTL-Voltage Compatible
High-Current 3-State Outputs Interface
Directly With System Bus or Can Drive Up
To 15 LSTTL Loads
Data Flow-Through Pinout (All Inputs on
Opposite Side From Outputs)
description/ordering information
These octal buffers and line drivers are designed to have the performance of the ’HCT240 devices and a pinout
with inputs and outputs on opposite sides of the package. This arrangement greatly facilitates printed circuit
board layout.
The 3-state control gate is a 2-input NOR. If either output-enable (OE1
or OE2) input is high, all eight outputs
are in the high-impedance state. The ’HCT540 devices provide inverted data at the outputs.
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 SN74HCT540N SN74HCT540N
–40°C to 85°C
SOIC DW
Tube SN74HCT540DW
HCT540
SOIC
–
DW
Tape and reel SN74HCT540DWR
HCT540
–55°C to 125°C CDIP – J Tube SNJ54HCT540J SNJ54HCT540J
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
FUNCTION TABLE
(each buffer/driver)
INPUTS
OUTPUT
OE1 OE2
A
Y
L L L H
L LH L
H XX Z
X H X Z
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.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE1
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
OE2
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
SN54HCT540 ...J PACKAGE
SN74HCT540 . . . DW OR N PACKAGE
(TOP VIEW)
Copyright  2003, 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.
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.