Document
UNISONIC TECHNOLOGIES CO., LTD
U74HC240
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
Lead Free
Halogen Free
U74HC240L-S20-R
U74HC240G-S20-R
U74HC240L-R20-R
U74HC240G-R20-R
U74HC240L-P20-R
U74HC240G-P20-R
Package
SOP-20 SSOP-20 TSSOP-20
CMOS IC
SOP-20 SSOP-20 TSSOP-20
Packing Tape Reel Tape Reel Tape Reel
■ MARKING
www.unisonic.com.tw Copyright © 2023 Unisonic Technologies Co., Ltd
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QW-R502-498.E
U74HC240
PIN CONFIGURATION
1OE 1 1A1 2 2Y4 3 1A2 4 2Y3 5 1A3 6 2Y2 7 1A4 8 2Y1 9 GND 10
20 V CC 19 2OE 18 1Y1 17 2A4 16 1Y2 15 2A3 14 1Y3 13 2A2 12 1Y4 11 2A1
FUNCTION TABLE (each buffer)
INPUTS
OE
A
L
H
L
L
H
X
LOGIC DIAGRAM (positive logic)
OUTPUT
Y
L H Z
1 1OE
2 1A1
19 2OE
18 1Y1
11 2A1
4 1A2
16 1Y2
13 2A2
6 1A3
14 1Y3
15 2A3
8 1A4
12 1Y4
17 2A4
CMOS IC
9 2Y1
7 2Y2
5 2Y3
3 2Y4
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-498.E
U74HC240
CMOS IC
ABSOLUTE MAXIMUM RATING (unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
Input Clamp Current (VIN<0, or VIN>VCC)
IIK
-0.5 ~ 7
V
±20
mA
Output Clamp Current (VOUT<0, or VOUT>VCC)
IOK
Output Current
IOUT
±20
mA
±35
mA
VCC or GND Current Storage Temperature
ICC
±70
mA
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 High-Level Input Voltage
Low-Level Input Voltage Input Voltage Output Voltage Input Transition Rise or Fall Rate Operating Temperature
SYMBOL VCC VIH
VIL VIN VOUT t/v TA
CONDITIONS
VCC = 2V VCC = 4.5V VCC = 6V VCC = 2V VCC = 4.5V VCC = 6V
VCC = 2V VCC = 4.5V VCC = 6V
ELECTRICAL CHARACTERISTICS (Unless otherwise specified)
MIN TYP MAX UNIT
2
5
6
V
1.5
3.15
V
4.2
0.5
1.35 V
1.8
0
VCC
V
0
VCC
V
1000
500 ns/V
400
-40
+125 °C
PARAMETER
High-Level Output Voltage
Low-Level Output Voltage
Input Leakage Current (A or OE inputs) High-impedance state Current Quiescent Supply Current
SYMBOL
TEST CONDITIONS
VCC = 2V, IOH = -20 μA VCC = 4.5V, IOH = -20 μA VOH 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 VOL VCC = 6V, IOL = 20 μA VCC = 4.5V, IOL = 6 mA VCC = 6V, IOL = 7.8 mA
II(LEAK) VCC = 6V, VIN = VCC or GND
IOZ
VCC = 6V, VO = VCC or GND VI(OE) = VIL or VIH
ICC
VCC = 6V, VIN = VCC or GND IOUT = 0
TA=25°С 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
TA=-40~+125°С MIN TYP(1) MAX
UNIT
1.9
4.4
5.9
V
3.7
5.2
0.1
0.1
0.1 V
0.4
0.4
±0.1 ±100
±100 μA
±0.01 ±0.5
±10 μA
8
160 μA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-498.E
U74HC240
CMOS IC
SWITCHING CHARACTERISTICS (Uless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Propagation delay from input A to output Y, tpd
tPLH / tPHL
CL=50pF, RL=1kΩ
CL=150pF, RL=1kΩ
Output enable time from input OE to output Y, ten
tPZH / tPZL
CL=50pF, RL=1kΩ
CL=150pF, RL=1kΩ
Output disable time from input OE to output Y, tdis
tPHZ / tPLZ
CL=50pF, RL=1kΩ
Propagation of rise or fall, tt
CL=50pF, RL=1kΩ
tr / tf
CL=150pF, RL=1kΩ
VCC=2V VCC=4.5V VCC=6V VCC=2V VCC=4.5V VCC=6V VCC=2V VCC=4.5V VCC=6V VCC=2V VCC=4.5V VCC=6V VCC=2V VCC=4.5V VCC=6V VCC=2V VCC=4.5V VCC=6V VCC=2V VCC=4.5V VCC=6V
TA=25°С MIN TYP MAX
50 100 10 20 9 17 75 150 15 30 13 26 75 150 15 30 13 26 100 200 20 40 17 34 44 150 22 30 21 26 28 60 8 12 6 10 45 210 17 42 13 36
TA=-40~+125°С MIN TYP MAX
UNIT
150 ns
30 ns
26 ns
190 ns
38 ns
32 ns
225 ns
45 ns
38 ns
250 ns
50 ns
43 ns
225 ns
45 ns
38 ns
90 ns
18 ns
.