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
high-impedance when either of the 2 inputs is applied with high
voltage.
FEATURES
* Operation voltage range: 2V ~ 6V
* High-current 3-state outputs for bus driver
* Inverting outputs
1OE and 2OE , all eight outputs will be in
TSSOP-20
*Pb-free plating product number:
U74HC540L
ORDERING INFORMATION
Ordering Number
Normal Lead Free Plating
U74HC540-P20-R U74HC540L-P20-R TSSOP-20 Tape Reel
U74HC540-P20-T U74HC540L-P20-T TSSOP-20 Tube
U74HC540L-P20-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
Package Packing
(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 QW-R126-004.A
U74HC540 CMOS IC
PIN CONFIGURATION
FUNCTION TABLE (each gate)
INPUT OUTPUT
1OE 2OE
L L L H
L L H L
H X X Z
X H X Z
A Y
LOGIC DIA GRAM (positive logic)
1
OE1
OE2
A1
A2
A3
A4
A5
A6
A7
A8
19
2
3
4
5
6
7
8
9
&EN
18
Y1
17
Y2
16
Y3
15
Y4
14
Y5
13
Y6
12
Y7
11
Y8
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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 I
VCC or GND Current ICC ±70 mA
Storage Temperature T
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 SYMBOL CONDITIONS MIN TYP MAX UNIT
Supply Voltage VCC 2 5 6 V
Input Voltage VIN 0 VCC V
Output Voltage V
Input Transition Rise or Fall Rate t
Operating Temperature T
0 VCC V
OUT
VCC=2V 0 1000
R
, tF
VCC=4.5V 0 500
V
=6V 0 400
CC
-40 85 ℃
A
±35 mA
OUT
-65 ~ +150 ℃
STG
ns
ELECTRICAL CHARACTERISTICS
T
=25℃ -40~85℃
PARAMETER SYMBOL TEST CONDITIONS
VCC=2V 1.5
High-Level Input Voltage VIH
VCC=4.5V 3.15
=6V 4.2
V
CC
VCC=2V 0.5
Low-Level Input Voltage VIL
VCC=4.5V 1.35
=6V 1.8
V
CC
VCC=2V, IOH=-20µA 1.9 1.998 1.9
VCC=4.5V, IOH=-20µA
High-Level Output Voltage VOH
VCC=6V, IOH=-20µA 5.9 5.999 5.9
VCC=4.5V, IOH=-6mA 3.98 4.3 3.84
V
=6V, IOH=-7.8mA 5.48 5.8 5.34
CC
VCC=2V, IOH=20µA 0.002 0.1 0.1
VCC=4.5V, IOH=20µA 0.001 0.1 0.1
Low-Level Output Voltage VOL
VCC=6V, IOH=20µA 0.001 0.1 0.1
VCC=4.5V, IOL =6mA 0.17 0.26 0.33
=6V, IOL =7.8mA 0.15 0.26 0.33
V
CC
Input Leakage Current I
Output Leakage Current I
Quiescent Supply Current IQ
VCC=6V, VIN=VCC or GND ±0.1 ±100 ±1000 nA
I(LEAK)
O(LEAK)
VCC=6V, V
V
CC
I
OUT
OUT=VCC
=6V, VIN=VCC or GND,
=0
or GND ±0.01 ±0.5 ±5 uA
Input Capacitance CIN VCC=2V~6V 3 10 10 pF
A
MIN TYP MAX MIN MAX
4.4 4.499 4.4
8 80 µA
UNIT
V
V
V
V
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U74HC540 CMOS IC
SWITCHING CHARACTERISTICS (t
PARAMETER SYMBOL TEST CONDITIONS
VCC=2V, CL=50 pF 35 100 125
VCC=2V, CL=150 pF 60 150 188
Propagation delay from
input (A) to output(Y)
3-state output enable time
from
OE to Yn
3-state output disable time
from
OE to Yn
t
PLH/ tPHL
t
PZH/ tPZL
t
PHZ/ tPLZ
VCC=4.5V, CL=50 pF 10 20 25
VCC=4.5V, CL=150 pF 15 30 38
VCC=6V, CL=50 pF 8 17 21
V
=6V, CL=150 pF 13 26 32
CC
VCC=2V, CL=50 pF 75 150 188
VCC=2V, CL=150 pF 100 200 250
VCC=4.5V, CL=50 pF 15 30 38
VCC=4.5V, CL=150 pF 20 40 50
VCC=6V, CL=50 pF 13 26 32
V
=6V, CL=150 pF 17 34 43
CC
VCC=2V, CL=50 pF 40 150 188
VCC=4.5V, CL=50 pF 18 30 38
VCC=6V, CL=50 pF 17 26 32
, tF≤3ns)
R
T
=25℃ -40~85℃
A
MIN TYP MAX MIN MAX
UNIT
ns
ns
ns
OPERATING CHARACTERISTICS
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Power Dissipation Capacitance Cpd No load, f=1MHz 35 pF
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U74HC540 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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