Texas Instruments SN74BCT540ADW, SN74BCT540ADWR, SN74BCT540AN, SNJ54BCT540FK, SNJ54BCT540J Datasheet
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SN54BCT540, SN74BCT540A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS012D – JULY 1988 – REVISED SEPTEMBER 1994
Copyright 1994, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• 3-State Outputs Drive Bus Lines or Buffer
Memory-Address Registers
• P-N-P Inputs Reduce DC Loading
• Data Flow-Through Pinout (All Inputs on
Opposite Side From Outputs)
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Plastic (N) and Ceramic (J) 300-mil DIPs
description
The SN54BCT540 and SN74BCT540A octal
buffers and line drivers are ideal for driving bus
lines or buffer memory-address registers. The
devices feature inputs and outputs on opposite
sides of the package that facilitate printed-circuitboard layout.
The 3-state control gate is a 2-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 SN54BCT540 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74BCT540A is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OUTPUT
OE1 OE2 A
OUTPUT
Y
L L L H
L LH L
H XX Z
X H X Z
SN54BCT540 ...J OR W PACKAGE
SN74BCT540A ... DW OR N PACKAGE
(TOP VIEW)
SN54BCT540 . . . FK PACKAGE
(TOP VIEW)
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
3212019
910111213
4
5
6
7
8
18
17
16
15
14
Y1
Y2
Y3
Y4
Y5
A3
A4
A5
A6
A7
A2A1OE1
Y7
Y6 OE2
A8
GND
Y8
V
CC
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.
SN54BCT540, SN74BCT540A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS012D – JULY 1988 – REVISED SEPTEMBER 1994
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
logic diagram (positive logic)
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
A8
Y1
18
Y2
17
Y3
16
Y4
15
Y5
14
Y6
13
Y7
12
Y8
11
1
19
OE1
OE2
EN
&
1
19
OE1
OE2
A1
2
18
Y1
To Seven Other Channels
1
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage range, V
CC
– 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 1) – 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the disabled or power-off state, V
O
– 0.5 V to 5.5 V. . . . . . . . . . . . . . .
Voltage range applied to any output in the high state, VO – 0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state: SN54BCT540 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT540A 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54BCT540 – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT540A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range – 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
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
recommended operating conditions
SN54BCT540 SN74BCT540A
MIN NOM MAX MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.8 0.8 V
I
IK
Input clamp current –18 –18 mA
I
OH
High-level output current –12 –15 mA
I
OL
Low-level output current 48 64 mA
T
A
Operating free-air temperature –55 125 0 70 °C
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