UNISONIC TECHNOLOGIES CO., LTD
U74HC540
OCTAL BUFFERS AND LINE
DRIVERS WITH 3-STATE
OUTPUTS
CMOS IC
DESCRIPTION
The U74HC540 combines with octal buffers and line drivers with
inverting 3-tate outputs. The 3-state output is controlled by output
enable inputs
OE
1
and
OE
2
, all eight outputs will be in
high-impedance when either of the 2 inputs is applied with high
voltage.
TSSOP-20
FEATURES
* Operation voltage range: 2V ~ 6V
* High-current 3-state outputs for bus driver
* Inverting outputs
*Pb-free plating product number:
U74HC540L
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
U74HC540-P20-R
U74HC540L-P20-R
U74HC540-P20-T
U74HC540L-P20-T
Package
TSSOP-20
TSSOP-20
Packing
Tape Reel
Tube
U74HC540L-P20-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) P20: TSSOP-20
(3) L: Lead Free Plating, Blank: Pb/Sn
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Copyright © 2007 Unisonic Technologies Co., Ltd
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U74HC540
PIN CONFIGURATION
CMOS IC
FUNCTION TABLE
(each gate)
INPUT
OUTPUT
A
L
H
X
X
Y
H
L
Z
Z
OE
1
L
L
H
X
OE
2
L
L
X
H
LOGIC DIAGRAM
(positive logic)
1
19
OE1
OE2
&
EN
A1
A2
A3
A4
A5
A6
A7
A8
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
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U74HC540
ABSOLUTE MAXIMUM RATINGS
(unless otherwise specified)(Note 1)
PARAMETER
CMOS IC
SYMBOL
RATINGS
UNIT
Supply Voltage
V
CC
-0.5~7
V
Input Clamp Current
I
IK
±20
mA
Output Clamp Current
I
OK
±20
mA
Output Current
I
OUT
±35
mA
V
CC
or GND
Current
I
CC
±70
mA
Storage Temperature
T
STG
-65 ~ +150
℃
Note 1.
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
Input Voltage
Output Voltage
Input Transition Rise or Fall Rate
Operating Temperature
SYMBOL
V
CC
V
IN
V
OUT
t
R
, t
F
T
A
CONDITIONS
MIN
2
0
0
0
0
0
-40
TYP
5
MAX
6
V
CC
V
CC
1000
500
400
85
UNIT
V
V
V
ns
℃
V
CC
=2V
V
CC
=4.5V
V
CC
=6V
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITIONS
V
CC
=2V
High-Level Input Voltage
V
IH
V
CC
=4.5V
V
CC
=6V
V
CC
=2V
Low-Level Input Voltage
V
IL
V
CC
=4.5V
V
CC
=6V
V
CC
=2V, I
OH
=-20µA
V
CC
=4.5V, I
OH
=-20µA
V
CC
=6V, I
OH
=-20µA
V
CC
=4.5V, I
OH
=-6mA
V
CC
=6V, I
OH
=-7.8mA
V
CC
=2V, I
OH
=20µA
V
CC
=4.5V, I
OH
=20µA
V
CC
=6V, I
OH
=20µA
V
CC
=4.5V, I
OL
=6mA
V
CC
=6V, I
OL
=7.8mA
V
CC
=6V, V
IN
=V
CC
or GND
V
CC
=6V, V
OUT
=V
CC
or GND
V
CC
=6V, V
IN
=V
CC
or GND,
I
OUT
=0
V
CC
=2V~6V
T
A
=25℃
MIN
TYP MAX
-40~85℃
MIN
MAX
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
3.98
5.48
1.998
4.499
5.999
4.3
5.8
0.002
0.001
0.001
0.17
0.15
±0.1
±0.01
1.9
4.4
5.9
3.84
5.34
0.1
0.1
0.1
0.26
0.26
±100
±0.5
8
3
10
0.1
0.1
0.1
0.33
0.33
±1000
±5
80
10
V
V
UNIT
High-Level Output Voltage
V
OH
V
Low-Level Output Voltage
V
OL
V
Input Leakage Current
Output Leakage Current
Quiescent Supply Current
Input Capacitance
I
I(LEAK)
I
O(LEAK)
I
Q
C
IN
nA
uA
µA
pF
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U74HC540
SWITCHING CHARACTERISTICS
(t
R
, t
F
≤3ns)
PARAMETER
SYMBOL
TEST CONDITIONS
V
CC
=2V, C
L
=50 pF
V
CC
=2V, C
L
=150 pF
V
CC
=4.5V, C
L
=50 pF
V
CC
=4.5V, C
L
=150 pF
V
CC
=6V, C
L
=50 pF
V
CC
=6V, C
L
=150 pF
V
CC
=2V, C
L
=50 pF
V
CC
=2V, C
L
=150 pF
V
CC
=4.5V, C
L
=50 pF
V
CC
=4.5V, C
L
=150 pF
V
CC
=6V, C
L
=50 pF
V
CC
=6V, C
L
=150 pF
V
CC
=2V, C
L
=50 pF
V
CC
=4.5V, C
L
=50 pF
V
CC
=6V, C
L
=50 pF
T
A
=25℃
MIN
TYP
35
60
10
15
8
13
75
100
15
20
13
17
40
18
17
MAX
100
150
20
30
17
26
150
200
30
40
26
34
150
30
26
CMOS IC
Propagation delay from
input (A) to output(Y)
t
PLH/
t
PHL
3-state output enable time
from
OE
to Yn
t
PZH/
t
PZL
3-state output disable time
from
OE
to Yn
t
PHZ/
t
PLZ
-40~85℃
UNIT
MIN
MAX
125
188
25
ns
38
21
32
188
250
38
ns
50
32
43
188
ns
38
32
OPERATING CHARACTERISTICS
PARAMETER
Power Dissipation Capacitance
SYMBOL
TEST CONDITIONS
Cpd
No load, f=1MHz
MIN
TYP
35
MAX
UNIT
pF
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U74HC540
TEST CIRCUIT AND WAVEFORMS
CMOS IC
Note:
C
L
includes probe and jig capacitance.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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