Page 1
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
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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
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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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HD74HC540/HD74HC541
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol V
Input voltage V
IH
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 1.5 — — 1.5 — V
4.5 3.15 — — 3.15 —
6.0 4.2 — — 4.2 —
V
IL
2.0 — — 0.3 — 0.3 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
Hysteresis voltage V
H
2.0 — 0.1 — — — V
4.5 — 0.4 — — —
6.0 — 0.4 — — —
Output voltage V
OH
2.0 1.9 2.0 — 1.9 — V Vin = VIH or VILIOH = –20 µA
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 — IOH = –6 mA
6.0 5.68 — — 5.63 — IOH = –7.8 mA
V
OL
2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33 IOL = 6 mA
6.0 — — 0.26 — 0.33 IOL = 7.8 mA
Off-state output
I
OZ
6.0 — — ±0.5 — ±5.0 µA Vin = VIH or VIL,
current
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent supply
I
CC
6.0 — — 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA
current
+85°C
Vout = V
or GND
CC
4
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HD74HC540/HD74HC541
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
Ta = 25°C
Item Symbol V
Propagation delay t
time t
PLH
PHL
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 — — 100 — 125 ns (HD74HC540 only)
4.5 — 11 20 — 25
6.0 — — 17 — 21
t
PLH
t
PHL
2.0 — — 115 — 145 ns (HD74HC541 only)
4.5 — 12 23 — 29
6.0 — — 20 — 25
Output enable t
time t
ZH
ZL
2.0 — — 150 — 190 ns
4.5 — 14 30 — 38
6.0 — — 26 — 33
Output disable t
time t
HZ
LZ
2.0 — — 150 — 190 ns
4.5 — 16 30 — 38
6.0 — — 26 — 33
Output rise/fall t
time t
TLH
THL
2.0 — — 60 — 75 ns
4.5 — 4 12 — 15
6.0 — — 10 — 13
Input capacitance Cin — — 5 10 — 10 pF
+85°C
5
Page 6
24.50
25.40 Max
Unit: mm
1120
6.30
1
0.89
1.27 Max
2.54 ± 0.25
1.30
10
0.48 ± 0.10
7.00 Max
0.51 Min
2.54 Min 5.08 Max
Hitachi Code
JEDEC
EIAJ
Weight
7.62
+ 0.11
0.25
– 0.05
0° – 15°
(reference value)
DP-20N
—
Conforms
1.26 g
Page 7
20
Unit: mm
12.6
13 Max
11
5.5
1
0.80 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
10
0.12
0.10 ± 0.10
0.15
M
2.20 Max
7.80
0.20 ± 0.04
*0.22 ± 0.05
0.70 ± 0.20
Hitachi Code
JEDEC
EIAJ
Weight
(reference value)
+ 0.20
– 0.30
1.15
0° – 8°
FP-20DA
—
Conforms
0.31 g
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20
Unit: mm
12.8
13.2 Max
11
7.50
1
0.935 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
10
0.12
0.20 ± 0.10
0.15
M
2.65 Max
10.40
0.25 ± 0.04
*0.27 ± 0.05
0.70
Hitachi Code
JEDEC
EIAJ
Weight
(reference value)
+ 0.25
– 0.40
1.45
+ 0.57
– 0.30
0° – 8°
FP-20DB
Conforms
—
0.52 g
Page 9
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contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
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products.
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