U74AC240_15 [UTC]
OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS;
| 型号： | U74AC240_15 |
| 厂家： | 
Unisonic Technologies |
| 描述： | OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS 驱动 输出元件 |
| 文件： | 总6页 (文件大小：164K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
U74AC240
CMOS IC
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
DESCRIPTION
The U74AC240 is a octal buffers/drivers 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 U74AC240 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; 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 6.5 ns from A to Y at 5V
* Low Power Consumption, ICC = 4μA (Max.) at 5.5V
* ±24mA Output Driver at 5.5V
ORDERING INFORMATION
Ordering Number
Package
Packing
Lead Free
Halogen Free
U74AC240L-P20-R
U74AC240L-P20-T
U74AC240G-P20-R
U74AC240G-P20-T
TSSOP-20
TSSOP-20
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
1 of 6
QW-R502-675.A
U74AC240
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
INPUTS
OUTPUT
Y
OE
A
L
L
H
H
L
X
L
H
Z
LOGIC DIAGRAM
1
19
11
2OE
2A1
1OE
18
16
14
12
9
2
1A1
1Y1
2Y1
7
5
3
4
13
15
17
1A2
1Y2
1Y3
1Y4
2A2
2A3
2A4
2Y2
2Y3
2Y4
6
1A3
8
1A4
UNISONIC TECHNOLOGIES CO., LTD
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U74AC240
CMOS IC
ABSOLUTE MAXIMUM RATING (unless otherwise specified)
PARAMETER
SYMBOL
VCC
RATINGS
-0.5~7
UNIT
Supply Voltage
Input Voltage
Output Voltage
V
V
VIN
-0.5~ VCC +0.5
-0.5~ VCC +0.5
±20
VOUT
IIK
V
Input Clamp Current (VIN<0, or VIN>VCC
)
mA
mA
mA
mA
°C
Output Clamp Current (VOUT<0, or VOUT>VCC
)
IOK
±20
Output Current
IOUT
ICC
±50
VCC or GND Current
±200
Storage Temperature
TSTG
-65 ~ +150
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.
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
90
UNIT
°C/W
Junction to Ambient
θJA
RECOMMENDED OPERATING COMDITIONS
PARAMETER
SYMBOL
VCC
CONDITIONS
MIN
2
TYP
MAX UNIT
Supply Voltage
6
V
VCC = 3V
2.1
High-Level Input Voltage
VIH
VIL
VCC = 4.5V
VCC = 5.5V
VCC = 3V
3.15
3.85
V
0.9
1.35
1.65
VCC
VCC
-12
-24
-24
12
Low-Level Input Voltage
VCC = 4.5V
VCC = 5.5V
V
Input Voltage
VIN
0
0
V
V
Output Voltage
VOUT
VCC=3V
High-level Output Current
Low-level Output Current
IOH
VCC=4.5V
VCC=5.5V
mA
mA
VCC=3V
IOL
VCC=4.5V
VCC=5.5V
24
24
Input Transition Rise or Fall Rate
Operating Temperature
Δt/Δv
TA
8
ns/V
°C
-40
85
UNISONIC TECHNOLOGIES CO., LTD
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U74AC240
CMOS IC
ELECTRICAL CHARACTERISTICS (TA =25°C , unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
OH = -50μA, VCC = 3V
MIN
2.9
TYP MAX UNIT
I
IOH = -50μA, VCC = 4.5V
IOH = -50μA, VCC = 5.5V
IOH = -12mA, VCC = 3V
IOH = -24mA, VCC = 4.5V
IOH = -24mA, VCC = 5.5V
4.4
5.4
High-Level Output Voltage
Low-Level Output Voltage
VOH
V
2.56
3.86
4.86
I
OL = 50μA, VCC = 3V
0.1
0.1
IOL = 50μA, VCC = 4.5V
IOL = 50μA, VCC = 5.5V
IOL = 12mA, VCC = 3V
IOL = 24mA, VCC = 4.5V
IOL = 24mA, VCC = 5.5V
0.1
V
VOL
0.36
0.36
0.36
Input Leakage Current
(A or OE inputs)
II(LEAK) VIN = VCC or GND, VCC = 5.5V
±0.1
μA
VO = VCC or GND, VCC = 5.5V
IOZ
High-impedance state Current
±0.25 μA
V
I(OE) = VIL or VIH
Quiescent Supply Current
Input Capacitance
ICC
VIN = VCC or GND, IOUT = 0, VCC = 5.5V
VIN = VCC or GND, VCC=5V
4
μA
CIN
2.5
pF
SWITCHING CHARACTERISTICS (TA =25°C)
PARAMETER
SYMBOL
TEST CONDITIONS
VCC=3.3±0.3V, CL=50pF, RL=500Ω
VCC=5±0.5V, CL=50pF, RL=500Ω
VCC=3.3±0.3V, CL=50pF, RL=500Ω
VCC=5±0.5V, CL=50pF, RL=500Ω
VCC=3.3±0.3V, CL=50pF, RL=500Ω
VCC=5±0.5V, CL=50pF, RL=500Ω
VCC=3.3±0.3V, CL=50pF, RL=500Ω
VCC=5±0.5V, CL=50pF, RL=500Ω
VCC=3.3±0.3V, CL=50pF, RL=500Ω
VCC=5±0.5V, CL=50pF, RL=500Ω
VCC=3.3±0.3V, CL=50pF, RL=500Ω
VCC=5±0.5V, CL=50pF, RL=500Ω
MIN
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
2.5
1.5
2
TYP MAX UNIT
6
8
6.5
8
tPLH
ns
ns
ns
ns
ns
ns
4.5
5.5
4.5
6
Propagation Delay from Input A
to Output Y, tPD
tPHL
tPZH
tPZL
tPHZ
tPLZ
6
10.5
7
Propagation Delay from Input
OE to Output Y, tEN
5
7
10
8
5.5
7
10
9
Propagation Delay from Input
OE to Output Y, tDIS
6.5
7.5
6.5
10.5
9
OPERATING CHARACTERISTICS (TA =25°C)
PARAMETER
Power Dissipation Capacitance Per Buffer/Driver
SYMBOL
CPD
TEST CONDITIONS
TYP UNIT
VCC = 5V, f=1MHz, CL=50pF
45
pF
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U74AC240
CMOS IC
TEST CIRCUIT AND WAVEFORMS
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
S1
Open
VLOAD
Open
Inputs
VCC
VM
VLOAD
CL
RL
VΔ
VIN
VCC
VCC
tR, tF
3.3V±0.3V
5V±0.5V
≤2.5ns
≤2.5ns
VCC/2
VCC/2
2*VCC
2*VCC
50pF
50pF
500Ω
500Ω
0.3V
0.5V
VIN
VM
Input
VM
0V
tPHL
tPLH
VOH
Output
VM
VM
VOL
tPLH
tPHL
VOH
VM
VM
Output
VOL
Voltage Waveforms Propagation Delay Times
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U74AC240
CMOS IC
TEST CIRCUIT AND WAVEFORMS(Cont.)
VIN
Input
VM
VM
0V
tPLZ
tPZL
VLOAD/2
Output
VM
S1 at VLOAD
VOL
tPZH
tPHZ
VOH
-
Output
VM
S1 at Open
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.
UNISONIC TECHNOLOGIES CO., LTD
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