HIT HD74HC541, HD74HC540 Datasheet
HD74HC540/HD74HC541
Octal Buffers/Line Drivers (with 3-state outputs)
Description
The HD74HC540 is an inverting buffer and the HD74HC541 is a non-inverting buffer. The 3-state control
gate operates as a two-input NOR such that if either G1 or G2 are high, all eight outputs are in the highimpedance state.
Features
• High Speed Operation: tpd = 11.5 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs Output Y
G
1
LL L H L
LL H L H
HX X Z Z
XH X Z Z
X : irrelevant
Z : off (high-impedance) state of a 3-state output.
G
2
A HD74HC540 HD74HD541
HD74HC540/HD74HC541
(
)
Pin Arrangement
HD74HC540
1
1 VCC
G
A1
2
A2
3
A3
4
A4
5
A5
6
A6
7
20
19
18
17
16
15
14
G2
Y1
Y2
Y3
Y4
Y5
A7
8
A8
9
10 11
GND
Top view
13
12
Y6
Y7
Y8
2
HD74HC541
(
)
HD74HC540/HD74HC541
1
1 VCC
G
A1
A2
A3
A4
A5
A6
A7
2
3
4
5
6
7
8
20
19
18
17
16
15
14
13
G2
Y1
Y2
Y3
Y4
Y5
Y6
A8
9
10 11
GND
12
Y7
Y8
Top view
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage range V
Input voltage V
Output voltage V
Output current I
DC current drai per VCC GND ICC, I
DC input diode current I
DC output diode current I
Power Dissipation per package P
CC
IN
OUT
OUT
GND
IK
OK
T
Storage temperature Tstg –65 to +150 °C
–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V
±35 mA
±75 mA
±20 mA
±20 mA
500 mW
3
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