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 +85C
Function Table
Inputs
G
1
G
2
A
Output Y
L
L
L
L
L
L
H
H
H
X
X
Z
X
H
X
Z
H :
High level
L
:
Low level
X :
Immaterial
Z
:
High impedance
HD74BC541A
2
Pin Arrangement
(Top view)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
V
CC
G
2
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
G
1
A1
A2
A3
A4
A5
A6
A7
A8
GND
Absolute Maximum Ratings
Item
Symbol
Rating
Unit
Supply voltage
V
CC
0.5 to +7.0
V
Input diode current
I
IK
30
mA
Input voltage
V
IN
0.5 to +7.5
V
Output voltage
V
OUT
0.5 to +7.5
V
Off state output voltage
V
OUT(off)
0.5 to +5.5
V
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.
HD74BC541A
3
Recommended Operating Conditions
Item
Symbol
Min
Typ
Max
Unit
Supply voltage
V
CC
4.5
5.0
5.5
V
Input voltage
V
IN
0
--
V
CC
V
Ouput voltage
V
OUT
0
--
V
CC
V
Operating temperature
Topr
40
--
85
C
Input rise/fall time*
1
t
r
, t
f
0
--
8
ns/V
Note:
1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Logic Diagram
Y1
Y2
Y3
Y4
Y5
Y6
Y7
A8
A7
A6
A5
A4
A2
A1
G
1
G
2
Y8
A3
HD74BC541A
4
Electrical Characteristics (Ta = 40 to +85C)
Item
Symbol
V
CC
(V)
Min
Max
Unit
Test Conditions
Input voltage
V
IH
2.0
--
V
V
IL
--
0.8
V
Output voltage
V
OH
4.5
2.4
--
V
I
OH
= 3 mA
4.5
2.0
--
V
I
OH
= 15 mA
V
OL
4.5
--
0.5
V
I
OL
= 48 mA
4.5
--
0.55
V
I
OL
= 64 mA
Input diode voltage
V
IK
4.5
--
1.2
V
I
IN
= 18 mA
Input current
I
I
5.5
--
250
A
V
IN
= 0 V
5.5
--
1.0
A
V
IN
= 5.5 V
5.5
--
100
A
V
IN
= 7.0 V
Short circuit output current*
1
I
OS
5.5
100
225
mA
V
IN
= 0 or 5.5 V
Off state output current
I
OZH
5.5
--
50
A
V
O
= 2.7 V
I
OZL
5.5
--
50
A
V
O
= 0.5 V
Supply current
I
CCL
5.5
--
29.5
mA
V
IN
= V
CC
or GND
All outputs is "L"
I
CCH
5.5
--
0.5
mA
V
IN
= V
CC
or GND
All outputs is "H"
I
CCZ
5.5
--
2.5
mA
V
IN
= V
CC
or GND
All outputs is "Z"
I
CCT
*
2
5.5
--
1.5
mA
V
IN
= 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
CC
increase at per one input pin.
HD74BC541A
5
Switching Characteristics (C
L
= 50 pF)
Ta = 25
C
V
CC
= 5.0 V
Ta = 40 to +85
C
V
CC
= 5.0 V
10%
Item
Symbol
Min
Max
Min
Max
Unit
Test Conditions
Propagation delay time
t
PLH
3.0
6.0
3.0
7.0
ns
See under figure
t
PHL
3.0
6.0
3.0
7.0
Output enable time
t
ZH
3.0
9.0
3.0
11.0
ns
t
ZL
3.0
9.0
3.0
11.0
Output disable time
t
HZ
3.0
8.0
3.0
10.0
ns
t
LZ
3.0
8.0
3.0
10.0
Input capacitance
C
IN
3.0 (Typ)
--
pF
V
IN
= V
CC
or GND
Output capacitance
C
O
15.0 (Typ)
--
pF
V
O
= V
CC
or GND
Test circuit
C =
50 pF
L
Input
V
CC
Output
OPEN
7V
500
50
Scope
G
2
G
1
A1
Y1
V
CC
Pulse
Generator
Z = 50
out
See Function Table
450
*3
Notes:
1.
C
L
includes probe and jig capacitance.
2.
A2-Y2 to A8-Y8 are identical to above load circuit.
3.
Open: t
PLH
, t
PHL
, t
ZH
, t
HZ
7V: t
ZL
, t
LZ
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