U74HC240_15 [UTC]
OCTAL BUFFERS;
| 型号： | U74HC240_15 |
| 厂家： | 
Unisonic Technologies |
| 描述： | OCTAL BUFFERS |
| 文件： | 总6页 (文件大小：242K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
TSSOP-20
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
Package
Packing
Tape Reel
U74HC240G-P20-R
TSSOP-20
■
MARKING
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Copyright © 2015 Unisonic Technologies Co., Ltd
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U74HC240
CMOS IC
PIN CONFIGURATION
VCC
19 2OE
1
2
20
1OE
1A1
2Y4
18
17
16
15
14
13
12
11
3
1Y1
2A4
1Y2
4
1A2
2Y3
5
2A3
1Y3
2A2
1Y4
2A1
6
1A3
2Y2
7
8
1A4
2Y1
9
10
GND
FUNCTION TABLE (each buffer)
INPUTS
OUTPUT
Y
OE
A
L
L
H
L
L
H
Z
H
X
LOGIC DIAGRAM (positive logic)
1
19
11
1OE
2OE
2A1
18
16
14
12
9
2
4
6
8
1A1
1A2
1A3
1A4
1Y1
1Y2
1Y3
1Y4
2Y1
7
13
15
17
2A2
2A3
2A4
2Y2
5
2Y3
3
2Y4
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U74HC240
CMOS IC
ABSOLUTE MAXIMUM RATING (unless otherwise specified)
PARAMETER
SYMBOL
VCC
RATINGS
-0.5 ~ 7
±20
UNIT
V
Supply Voltage
Input Clamp Current (VIN<0, or VIN>VCC
)
IIK
mA
mA
mA
mA
°C
Output Clamp Current (VOUT<0, or VOUT>VCC
)
IOK
±20
Output Current
IOUT
ICC
±35
VCC or GND Current
±70
Storage Temperature
TSTG
-65 ~ +150
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
CONDITIONS
MIN TYP MAX UNIT
2
5
6
V
VCC = 2V
1.5
3.15
4.2
High-Level Input Voltage
Low-Level Input Voltage
VIH
VIL
V
VCC = 4.5V
VCC = 6V
VCC = 2V
VCC = 4.5V
VCC = 6V
0.5
1.35
1.8
V
Input Voltage
VIN
0
0
VCC
VCC
1000
500
400
85
V
V
Output Voltage
VOUT
VCC = 2V
VCC = 4.5V
VCC = 6V
Input Transition Rise or Fall Rate
Operating Temperature
t/v
ns/V
°C
TA
-40
ELECTRICAL CHARACTERISTICS (TA =25°C , unless otherwise specified)
PARAMETER
SYMBOL
VOH
TEST CONDITIONS
VCC = 2V, IOH = -20 μA
MIN TYP(1) MAX UNIT
1.9 1.998
VCC = 4.5V, IOH = -20 μA
VCC = 6V, IOH = -20 Μa
VCC = 4.5V, IOH = -6 mA
4.4 4.499
High-Level Output Voltage
Low-Level Output Voltage
V
V
5.9 5.999
3.98
5.48
4.3
VCC = 6V, IOH = -7.8 mA
5.8
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
0.002 0.1
0.001 0.1
0.001 0.1
0.17 0.26
0.15 0.26
VOL
Input Leakage Current
(A or OE inputs)
II(LEAK)
IOZ
VCC = 6V, VIN = VCC or GND
±0.1 ±100
±0.01 ±0.5
8
μA
μA
V
V
V
CC = 6V, VO = VCC or GND
I(OE) = VIL or VIH
High-impedance state Current
CC = 6V, VIN = VCC or GND
Quiescent Supply Current
Input Capacitance
ICC
μA
I
OUT = 0
CIN
VCC = 2V to 6V, VIN = VCC or GND
3
10
pF
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U74HC240
CMOS IC
SWITCHING CHARACTERISTICS (TA =25°C)
PARAMETER
SYMBOL
TEST CONDITIONS
VCC=2V
MIN TYP MAX UNIT
50
10
9
100
20
CL=50pF,
ns
ns
ns
ns
ns
ns
ns
VCC=4.5V
CC=6V
RL=1kΩ
Propagation delay from input A to
output Y, tpd
V
17
tPLH / tPHL
VCC=2V
75
15
13
75
15
13
100
20
17
44
22
21
28
8
150
30
CL=150pF,
RL=1kΩ
VCC=4.5V
VCC=6V
26
VCC=2V
150
30
CL=50pF,
RL=1kΩ
VCC=4.5V
Output enable time from input OE to
output Y, ten
VCC=6V
26
tPZH / tPZL
tPHZ / tPLZ
tr / tf
VCC=2V
200
40
CL=150pF,
RL=1kΩ
VCC=4.5V
VCC=6V
34
VCC=2V
150
30
Output disable time from input OE to
output Y, tdis
CL=50pF,
RL=1kΩ
VCC=4.5V
VCC=6V
26
VCC=2V
60
CL=50pF,
RL=1kΩ
VCC=4.5V
12
VCC=6V
6
10
Propagation of rise or fall, tt
VCC=2V
45
17
13
210
42
CL=150pF,
RL=1kΩ
VCC=4.5V
VCC=6V
36
OPERATING CHARACTERISTICS (TA =25°C)
PARAMETER
SYMBOL
Cpd
TEST CONDITIONS
No load
MIN TYP MAX UNIT
Power dissipation capacitance per
buffer/driver
35
pF
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U74HC240
CMOS IC
TEST CIRCUIT AND WAVEFORMS
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
S1
Open
VLOAD
GND
Inputs
VM
VLOAD
VCC
CL
RL
VIN
tr, tf
VCC
≤ 6ns
VCC/2
50 or 150pF
500Ω
VCC
0V
90%
90%
Input
10%
10%
t
t
r
f
VIN
Input
VM
VM
0V
tPHL
tPLH
VOH
90%
90%
Output
VM
VM
10%
10%
VOL
t
t
r
f
tPHL
tPLH
VOH
90%
90%
VM
Output
VM
10%
10%
VOL
t
t
r
f
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U74HC240
CMOS IC
TEST CIRCUIT AND WAVEFORMS (Cont.)
VIN
0V
Input
VM
VM
tPLZ
tPZL
VLOAD
Output
VM
10 %
90 %
S1 at VLOAD
VOL
tPHZ
tPZH
VOH
0V
Output
VM
S1 at GND
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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