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
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 +85°C)
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
µ
A
V
IN
= 0 V
5.5
--
1.0
µ
A
V
IN
= 5.5 V
5.5
--
100
µ
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
µ
A
V
O
= 2.7 V
I
OZL
5.5
--
50
µ
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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