Datasheet

UNISONIC TECHNOLOGIES CO., LTD
U74HC240
CMOS IC
OCTAL BUFFERS AND LINE
DRIVERS WITH 3-STATE OUTPUTS

DESCRIPTION
The U74HC240 is a octal buffer and line driver with 3-state
outputs. It is organized as two 4-bit buffers/drivers with separate
output-enable ( OE ) inputs. When OE is high, the Y outputs are in
a high-impedance state and the outputs neither load nor drive the
bus lines. When OE is low, the device passes inverted data from
the A inputs to the Y outputs.
The U74HC240 is designed to improve the performance and
density of 3-state memory address drivers, clock drivers and
bus-oriented receivers and transmitters.
To ensure the high-impedance state during power up or power
down, OE should be tied to VCC through a pull-up resistor; and the
minimum value of the resistor is determined by the current-sinking
capability of the driver.

FEATURES
* Wide supply voltage range from 2V to 6V
* Max tpd of 9 ns from A to Y at 6V
* Low power consumption, ICC = 8 μA (Max.) at 6V
* ±6 mA output driver at 5V
* Low Input Current of 1 μA Max

ORDERING INFORMATION
Ordering Number
U74HC240G-R20-R
U74HC240G-P20-R
■
Package
SSOP-20
TSSOP-20
Packing
Tape Reel
Tape Reel
MARKING
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U74HC240

CMOS IC
PIN CONFIGURATION
1OE
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND

20 V CC
19 2OE
18 1Y1
17 2A4
16 1Y2
1
2
3
4
5
6
7
8
9
10
1Y3
2A2
1Y4
2A1
FUNCTION TABLE (each buffer)
INPUTS

2A3
15
14
13
12
11
OUTPUT
OE
A
Y
L
L
H
H
L
X
L
H
Z
LOGIC DIAGRAM (positive logic)
1OE
1A1
1A2
1A3
1A4
1
2OE
2
18
4
16
6
14
8
12
1Y1
2A1
1Y2
2A2
1Y3
2A3
1Y4
2A4
UNISONIC TECHNOLOGIES CO., LTD
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19
11
9
13
7
15
5
17
3
2Y1
2Y2
2Y3
2Y4
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U74HC240

CMOS IC
ABSOLUTE MAXIMUM RATING (unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
-0.5 ~ 7
V
Input Clamp Current (VIN<0, or VIN>VCC)
IIK
±20
mA
Output Clamp Current (VOUT<0, or VOUT>VCC)
IOK
±20
mA
Output Current
IOUT
±35
mA
VCC or GND Current
ICC
±70
mA
Storage Temperature
TSTG
-65 ~ +150
°C
Notes: 1. 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.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

RECOMMENDED OPERATING COMDITIONS
PARAMETER
Supply Voltage
SYMBOL
VCC
High-Level Input Voltage
VIH
Low-Level Input Voltage
Input Voltage
Output Voltage
Input Transition Rise or Fall Rate
Operating Temperature

VIL
CONDITIONS
VCC = 2V
VCC = 4.5V
VCC = 6V
VCC = 2V
VCC = 4.5V
VCC = 6V
VIN
VOUT
t/v
MIN
2
1.5
3.15
4.2
TYP
5
UNIT
V
V
0.5
V
1.35
1.8
VCC
V
VCC
V
1000
500 ns/V
400
85
°C
0
0
VCC = 2V
VCC = 4.5V
VCC = 6V
TA
MAX
6
-40
ELECTRICAL CHARACTERISTICS (TA =25°C , unless otherwise specified)
PARAMETER
SYMBOL
High-Level Output Voltage
VOH
Low-Level Output Voltage
VOL
Input Leakage Current
(A or OE inputs)
II(LEAK)
High-impedance state Current
IOZ
Quiescent Supply Current
ICC
Input Capacitance
CIN
TEST CONDITIONS
VCC = 2V, IOH = -20 μA
VCC = 4.5V, IOH = -20 μA
VCC = 6V, IOH = -20 mA
VCC = 4.5V, IOH = -6 mA
VCC = 6V, IOH = -7.8 mA
VCC = 2V, IOL = 20 μA
VCC = 4.5V, IOL = 20 μA
VCC = 6V, IOL = 20 μA
VCC = 4.5V, IOL = 6 mA
VCC = 6V, IOL = 7.8 mA
MIN TYP(1) MAX
1.9 1.998
4.4 4.499
5.9 5.999
3.98
4.3
5.48
5.8
0.002 0.1
0.001 0.1
0.001 0.1
0.17 0.26
0.15 0.26
UNIT
VCC = 6V, VIN = VCC or GND
±0.1
±100
μA
±0.01
±0.5
μA
8
μA
10
pF
VCC = 6V, VO = VCC or GND
VI(OE) = VIL or VIH
VCC = 6V, VIN = VCC or GND
IOUT = 0
VCC = 2V to 6V, VIN = VCC or GND
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3
V
V
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U74HC240

CMOS IC
SWITCHING CHARACTERISTICS (TA =25°C , unless otherwise specified)
PARAMETER
SYMBOL
Propagation delay from input A to
output Y, tpd
tPLH / tPHL
Output enable time from input OE to
output Y, ten
tPZH / tPZL
Output disable time from input OE to
output Y, tdis
tPHZ / tPLZ
Propagation of rise or fall, tt

tr / tf
TEST CONDITIONS
VCC=2V
CL=50pF,
VCC=4.5V
RL=1kΩ
VCC=6V
VCC=2V
CL=150pF,
VCC=4.5V
RL=1kΩ
VCC=6V
VCC=2V
CL=50pF,
VCC=4.5V
RL=1kΩ
VCC=6V
VCC=2V
CL=150pF,
VCC=4.5V
RL=1kΩ
VCC=6V
VCC=2V
CL=50pF,
VCC=4.5V
RL=1kΩ
VCC=6V
VCC=2V
CL=50pF,
VCC=4.5V
RL=1kΩ
VCC=6V
VCC=2V
CL=150pF,
VCC=4.5V
RL=1kΩ
VCC=6V
MIN
TYP
50
10
9
75
15
13
75
15
13
100
20
17
44
22
21
28
8
6
45
17
13
MAX UNIT
100
ns
20
17
150
ns
30
26
150
ns
30
26
200
ns
40
34
150
ns
30
26
60
ns
12
10
210
ns
42
36
TYP
MAX
OPERATING CHARACTERISTICS (TA =25°C , unless otherwise specified)
PARAMETER
Power dissipation capacitance per
buffer/driver
SYMBOL
CPD
TEST CONDITIONS
No load
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MIN
35
UNIT
pF
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U74HC240

CMOS IC
TEST CIRCUIT AND WAVEFORMS
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Inputs
VIN
VCC
tr, tf
≤ 6ns
S1
Open
VLOAD
GND
VM
VLOAD
CL
RL
VCC/2
VCC
50 or 150pF
500Ω
90%
VCC
90%
Input
10%
10%
tr
0V
tf
VOLTAGE WAVEFORMS INPUT RISE AND FALL TIMES
VIN
Input
VM
VM
0V
tPHL
tPLH
90%
Output
VOH
90%
VM
VM
10%
tPHL
10%
tr
tPLH
tf
90%
90%
Output
VM
VOL
VOH
VM
10%
tf
10%
VOL
tr
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
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U74HC240

CMOS IC
TEST CIRCUIT AND WAVEFORMS (Cont.)
VIN
Input
VM
VM
0V
tPLZ
tPZL
VLOAD
Output
VM
10 %
S1 at VLOAD
tPHZ
tPZH
Output
VOL
90 %
VOH
VM
S1 at GND
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
Notes: 1. CL includes probe and jig capacitance.
2. All input pulses are supplied by generators having the following characteristics: PRR ≤1MHz, ZO = 50Ω.
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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