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HD74BC541A
Octal Buffers/Line Drivers With 3 State Outputs
ADE-205-023 (Z)
Rev. 0
June 1993
Description
The HD74BC541A provides high drivability and operation equal to or better than high speed bipolar
standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5
of high speed bipolar logic IC, when the frequency is 10 MHz. The device has eight inverter drivers with
three state outputs in a 20 pin package. When G1 and G2 is low level, this drivers set up output is enable.
Features
• Input/Output are at high impedance state when power supply is off.
• Built in input pull up circuit can make input pins be open, when not used.
• Input is TTL level.
• Wide operating temperature range
Ta = –40 to +85°C
Function Table
Inputs
G1 G2 A Output Y
LL L L
LL H H
HX X Z
XH X Z
H : High level
L : Low level
X : Immaterial
Z : High impedance
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HD74BC541A
Pin Arrangement
G1
A1
A2
A3
A4
A5
A6
A7
A8
GND
10
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
V
G2
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
CC
(Top view)
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage V
Input diode current I
Input voltage V
Output voltage V
Off state output voltage V
CC
IK
IN
OUT
OUT(off)
Storage temperature Tstg –65 to +150 °C
Note: 1. The absolute maximum ratings are values which must not individually be exceeded, and
furthermore, no two of which may be realized at the same time.
–0.5 to +7.0 V
±30 mA
–0.5 to +7.5 V
–0.5 to +7.5 V
–0.5 to +5.5 V
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HD74BC541A
Recommended Operating Conditions
Item Symbol Min Typ Max Unit
Supply voltage V
Input voltage V
Ouput voltage V
CC
IN
OUT
Operating temperature Topr –40 — 85 °C
Input rise/fall time*
1
tr , t
f
Note: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Logic Diagram
G1
G2
4.5 5.0 5.5 V
0—VCCV
0—VCCV
0 — 8 ns/V
A1
A2
A3
A4
A5
A6
A7
A8
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
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HD74BC541A
Electrical Characteristics (Ta = –40 to +85°C)
Item Symbol VCC(V) Min Max Unit Test Conditions
Input voltage V
Output voltage V
IH
IL
V
OH
4.5 2.4 — V IOH = –3 mA
4.5 2.0 — V IOH = –15 mA
V
OL
4.5 — 0.5 V IOL = 48 mA
4.5 — 0.55 V IOL = 64 mA
Input diode voltage V
Input current I
IK
I
4.5 — –1.2 V IIN = –18 mA
5.5 — –250 µAV
5.5 — 1.0 µAV
5.5 — 100 µAV
Short circuit output current*1I
Off state output current I
Supply current I
OS
OZH
I
OZL
CCL
I
CCH
I
CCZ
2
I
*
CCT
5.5 –100 –225 mA VIN = 0 or 5.5 V
5.5 — 50 µAV
5.5 — –50 µAV
5.5 — 29.5 mA VIN = VCC or GND
5.5 — 0.5 mA VIN = VCC or GND
5.5 — 2.5 mA VIN = VCC or GND
5.5 — 1.5 mA VIN = 3.4V or 0.5V
Notes: 1. Not more than one output should be shorted at a time and duration of the short circuit should not
exceed one second.
2. When input by the TTL level, it shows I
2.0 — V
— 0.8 V
increase at per one input pin.
CC
= 0 V
IN
= 5.5 V
IN
= 7.0 V
IN
= 2.7 V
O
= 0.5 V
O
All outputs is “L”
All outputs is “H”
All outputs is “Z”
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Switching Characteristics (CL = 50 pF)
HD74BC541A
Ta = 25°C
V
= 5.0 V
CC
Ta = –40 to +85°C
VCC = 5.0 V ±10%
Item Symbol Min Max Min Max Unit Test Conditions
Propagation delay time t
Output enable time t
Output disable time t
Input capacitance C
Output capacitance C
PLH
t
PHL
ZH
t
ZL
HZ
t
LZ
IN
O
3.0 6.0 3.0 7.0 ns See under figure
3.0 6.0 3.0 7.0
3.0 9.0 3.0 11.0 ns
3.0 9.0 3.0 11.0
3.0 8.0 3.0 10.0 ns
3.0 8.0 3.0 10.0
3.0 (Typ) — pF VIN = VCC or GND
15.0 (Typ) — pF VO = VCC or GND
Test circuit
V
CC
G1
V
CC
Input
Pulse
Generator
Z = 50Ω
out
A1
See Function Table
G2
Notes: 1. CL includes probe and jig capacitance.
2. A2-Y2 to A8-Y8 are identical to above load circuit.
3. Open: t
7V: tZL, t
PLH
, t
, tZH, t
PHL
LZ
HZ
Y1
Output
C =
L
50 pF
50Ω
Scope
500Ω
450Ω
*3
OPEN
7V
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HD74BC541A
Waveforms-1
Input A
10 %
Output Y
Waveforms-2
t
f
Input G
Waveform – A
Waveform – B
Notes: 1. tr = 2.5 ns, tf = 2.5 ns
2. Input waveforms: PRR = 1 MHz, duty cycle 50%
3. Waveform-A shows input conditions such that the output is “L” level when enable by the
4. Waveform-B shows input conditions such that the output is “H” level when enable by the
90 %
1.5 V
10 %
output control.
output control.
t
t
t
ZL
ZH
r
1.5 V
t
PLH
1.5 V
90 %
1.5 V
1.5 V
90 %
t
r
10 %
1.5 V
90 %
1.5 V
t
f
3 V
10 %
t
PHL
0 V
V
OH
1.5 V
V
OL
3 V
0 V
t
LZ
3.5 V
V + 0.3 V
OL
t
HZ
V – 0.3 V
OH
V
OL
V
OH
0 V
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Package Dimensions
HD74BC541A
Unit: mm
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Cautions
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copyright, trademark, or other intellectual property rights for information contained in this document.
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intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
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
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
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written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
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