
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
Input voltage range, V
I
(see Note 1)
Voltage range applied to any output in the disabled or power-off state, V
O
Voltage range applied to any output in the high state, V
O
Current into any output in the low state: SN54BCT540
– 0.5 V to 7 V
– 0.5 V to 7 V
– 0.5 V to 5.5 V
– 0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT540A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
96 mA
128 mA
SN74BCT540A
Operating free-air temperature range, T
A
: SN54BCT540
– 55
°
C to 125
°
C
0
°
C to 70
°
C
– 65
°
C to 150
°
C
Storage temperature range
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
MIN
NOM
SN74BCT540A
MIN
NOM
UNIT
MAX
MAX
VCC
VIH
VIL
IIK
IOH
IOL
TA
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
High-level input voltage
2
2
V
Low-level input voltage
0.8
0.8
V
Input clamp current
–18
–18
mA
High-level output current
–12
–15
mA
Low-level output current
48
64
mA
°
C
Operating free-air temperature
–55
125
0
70