HIT HD74HCT541, HD74HCT540 Datasheet
HD74HCT540/HD74HCT541
Octal Buffers/Line Drivers (with 3-state outputs)
Description
The HD74HCT540 is an inverting buffer and the HD74HCT541 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
high-impedance state.
Features
• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
• High Speed Operation: tpd (A to Y) = 12 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 4.5 to 5.5 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs Outputs 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 HD74HCT540 HD74HCT541
HD74HCT540/HD74HCT541
Pin Arrangement
HD74HCT540
G
1
1
20
V
CC
HD74HCT541
A1
A2
A3
A4
A5
A6
A7
A8
GND
G
A1
2
3
4
5
6
7
8
9
10
19
18
17
16
15
14
13
12
11
G2
Y
Y2
Y3
Y4
Y5
Y6
Y7
Y8
1
(Top view)
1
1
2
20
19
V
G2
CC
A2
A3
A4
A5
A6
A7
A8
GND
3
4
5
6
7
8
9
10
18
17
16
15
14
13
12
11
Y
Y2
Y3
Y4
Y5
Y6
Y7
Y8
1
(Top view)
2
HD74HCT540/HD74HCT541
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage range V
Input voltage V
Output voltage V
Output current I
DC current drain 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
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol Min Typ Max Min Max Unit V
Input voltage V
Output voltage V
IH
V
IL
OH
2.0 — — 2.0 — V 4.5 to
— — 0.8 — 0.8 V 4.5 to
4.4 — — 4.4 — V 4.5 Vin = VIH or VILIOH = –20 µA
4.18 — — 4.13 — 4.5 IOH = –6 mA
V
OL
— — 0.1 — 0.1 V 4.5 Vin = VIH or VILIOL = 20 µA
— — 0.26 — 0.33 4.5 IOL = 6 mA
Off-state output
I
OZ
——±0.5 — ±5.0 µA 5.5 Vin = VIH or VIL,
current
Input current Iin — — ±0.1 — ±1.0 µA 5.5 Vin = VCC or GND
Quiescent current I
CC
— — 4.0 — 40 µA 5.5 Vin = VCC or GND, Iout = 0 µA
+85°C Test Conditions
–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
(V)
CC
5.5
5.5
Vout = V
or GND
CC
3
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