Datasheet

UNISONIC TECHNOLOGIES CO., LTD
U74HC540
CMOS IC
OCTAL BUFFERS AND LINE
DRIVERS WITH 3-STATE
OUTPUTS

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 OE1 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

ORDERING INFORMATION
Ordering Number
U74HC540G-P20-R
■
Package
TSSOP-20
Packing
Tape Reel
MARKING
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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U74HC540
CMOS IC

PIN CONFIGURATION

FUNCTION TABLE (each gate)
INPUT

OUTPUT
OE1
OE 2
A
L
L
H
X
L
L
X
H
L
H
X
X
Y
H
L
Z
Z
LOGIC DIAGRAM (positive logic)
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U74HC540

CMOS IC
ABSOLUTE MAXIMUM RATINGS (unless otherwise specified)(Note 1)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
-0.5~7
V
Input Clamp Current
IIK
±20
mA
Output Clamp Current
IOK
±20
mA
Output Current
IOUT
±35
mA
VCC or GND Current
ICC
±70
mA
Storage Temperature
TSTG
-65 ~ +150
°C
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
SYMBOL
VCC
VIN
VOUT
Input Transition Rise or Fall Rate
Operating Temperature

tR, tF
CONDITIONS
MIN
2
0
0
0
0
0
-40
VCC=2V
VCC=4.5V
VCC=6V
TA
TYP
5
MAX
6
VCC
VCC
1000
500
400
85
UNIT
V
V
V
ns
°C
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
High-Level Input Voltage
VIH
Low-Level Input Voltage
VIL
High-Level Output Voltage
Low-Level Output Voltage
Input Leakage Current
Output Leakage Current
VOH
VOL
II(LEAK)
IO(LEAK)
Quiescent Supply Current
IQ
Input Capacitance
CIN
TEST CONDITIONS
VCC=2V
VCC=4.5V
VCC=6V
VCC=2V
VCC=4.5V
VCC=6V
VCC=2V, IOH=-20μA
VCC=4.5V, IOH=-20μA
VCC=6V, IOH=-20μA
VCC=4.5V, IOH=-6mA
VCC=6V, IOH=-7.8mA
VCC=2V, IOH=20μA
VCC=4.5V, IOH=20μA
VCC=6V, IOH=20μA
VCC=4.5V, IOL =6mA
VCC=6V, IOL =7.8mA
VCC=6V, VIN=VCC or GND
VCC=6V, VOUT=VCC or GND
VCC=6V,VIN=VCC or GND,
IOUT=0
VCC=2V~6V
UNISONIC TECHNOLOGIES CO., LTD
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MIN
1.9
4.4
5.9
3.98
5.48
TA =25°C
TYP MAX
1.998
4.499
5.999
4.3
5.8
0.002
0.001
0.001
0.17
0.15
±0.1
±0.01
3
0.1
0.1
0.1
0.26
0.26
±100
±0.5
-40~85°C
UNIT
MIN
MAX
1.5
V
3.15
4.2
0.5
V
1.35
1.8
1.9
4.4
V
5.9
3.84
5.34
0.1
0.1
V
0.1
0.33
0.33
±1000 nA
±5
uA
8
80
μA
10
10
pF
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U74HC540

SWITCHING CHARACTERISTICS (tR, tF≤3ns)
PARAMETER
Propagation delay from
input (A) to output(Y)
3-state output enable time
from
CMOS IC
OE to Yn
3-state output disable time
SYMBOL
tPLH/ tPHL
tPZH/ tPZL
tPHZ/ tPLZ
TEST CONDITIONS
VCC=2V, CL=50 pF
VCC=2V, CL=150 pF
VCC=4.5V, CL=50 pF
VCC=4.5V, CL=150 pF
VCC=6V, CL=50 pF
VCC=6V, CL=150 pF
VCC=2V, CL=50 pF
VCC=2V, CL=150 pF
VCC=4.5V, CL=50 pF
VCC=4.5V, CL=150 pF
VCC=6V, CL=50 pF
VCC=6V, CL=150 pF
VCC=2V, CL=50 pF
VCC=4.5V, CL=50 pF
VCC=6V, CL=50 pF
from
OE to Yn

OPERATING CHARACTERISTICS
PARAMETER
Power Dissipation Capacitance
SYMBOL
TEST CONDITIONS
Cpd
No load, f=1MHz
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MIN
TA=25°C
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
MIN
-40~85°C
UNIT
MIN
MAX
125
188
25
ns
38
21
32
188
250
38
ns
50
32
43
188
ns
38
32
TYP
35
MAX
UNIT
pF
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
CMOS IC
TEST CIRCUIT AND WAVEFORMS
Note: CL 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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