U74AC244 [UTC]
The U74AC244 is designed to improve the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters.; 该U74AC244目的是为了提高三态存储器地址驱动器，时钟驱动器和总线的面向的接收器和发射器的性能和密度。
| 型号： | U74AC244 |
| 厂家： | 
Unisonic Technologies |
| 描述： | The U74AC244 is designed to improve the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. |
| 文件： | 总6页 (文件大小：190K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
U74AC244
CMOS IC
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
DESCRIPTION
The U74AC244 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 noninverted data from
the A inputs to the Y outputs.
TSSOP-20
The U74AC244 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 7 ns from A to Y at 5V
* Low power consumption, ICC = 4 μA (Max.) at 5.5V
* ±24 mA output driver at 5.5V
ORDERING INFORMATION
Ordering Number
Lead Free
Package
Packing
Halogen Free
U74AC244L-P20-R
U74AC244L- P20-T
U74AC244G- P20-R
U74AC244G- P20-T
TSSOP-20
TSSOP-20
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
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U74AC244
CMOS IC
PIN CONFIGURATION
FUNCTION TABLE (each buffer)
INPUTS
OUTPUT
Y
OE
A
L
L
H
L
H
L
H
X
Z
LOGIC SYMBOL (positive logic)
1
19
11
1OE
2OE
2A1
18
2
4
6
8
9
1A1
1Y1
2Y1
16
14
12
7
13
15
17
1A2
1A3
1A4
1Y2
1Y3
1Y4
2Y2
2A2
2A3
2A4
5
2Y3
3
2Y4
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U74AC244
CMOS IC
ABSOLUTE MAXIMUM RATING (TA =25°C , unless otherwise specified)
PARAMETER
SYMBOL
VCC
TEST CONDITIONS
-0.5~7
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
Notes: 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
RATING
85
UNIT
°C/W
Junction to Ambient
θJA
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
VCC
TEST CONDITIONS
MIN
2
MAX
6
UNIT
Supply Voltage
V
VCC = 3V
2.1
High-Level Input Voltage
VIH
VIL
V
VCC = 4.5V
VCC = 5.5V
VCC = 3V
3.15
3.85
0.9
1.35
1.65
VCC
VCC
-12
-24
-24
12
Low-Level Input Voltage
V
VCC = 4.5V
VCC = 5.5V
Input Voltage
VIN
0
0
V
V
Output Voltage
VOUT
VCC=3V
High-level Output Current
Low-level Output Current
IOH
mA
mA
VCC=4.5V
VCC=5.5V
VCC=3V
IOL
VCC=4.5V
24
VCC=5.5V
24
Input Transition Rise or Fall Rate
Operating Temperature
Δt/Δv
TA
8
ns/V
°C
-40
85
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U74AC244
CMOS IC
ELECTRICAL CHARACTERISTICS (TA =25°C , unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
IOH = -50 μA, VCC = 3V
MIN TYP MAX UNIT
2.9
4.4
IOH = -50 μA, VCC = 4.5V
IOH = -50 μA, VCC = 5.5V
IOH = -12 mA, VCC = 3V
IOH = -24 mA, VCC = 4.5V
IOH = -24 mA, VCC = 5.5V
IOL = 50 μA, VCC = 3V
5.4
High-Level Output Voltage
Low-Level Output Voltage
VOH
V
2.56
3.86
4.86
0.1
IOL = 50 μA, VCC = 4.5V
IOL = 50 μA, VCC = 5.5V
IOL = 12 mA, VCC = 3V
IOL = 24 mA, VCC = 4.5V
IOL = 24 mA, VCC = 5.5V
0.1
0.1
V
VOL
0.36
0.36
0.36
Input Leakage Current
(A or OE inputs)
II(LEAK)
IOZ
VIN = VCC or GND, VCC = 5.5V
±0.1 μA
±0.25 μA
VO = VCC or GND, VCC = 5.5V
High-impedance state Current
VI(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
PARAMETER
SYMBOL
tPLH
TEST CONDITIONS
MIN TYP MAX UNIT
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
2
6.5
5
9
7
ns
ns
Propagation delay from input A to
output Y, tpd
1.5
2
6.5
5
9
tPHL
tPZH
tPZL
tPHZ
tPLZ
1.5
2
7
6
10.5
7
ns
ns
ns
ns
Propagation delay from input OE to
output Y, ten
1.5
2.5
1.5
3
5
7.5
5.5
7
10
8
10
9
Propagation delay from input OE to
output Y, tdis
2.5
2.5
2
6.5
7.5 10.5
6.5
V
CC=5±0.5V, CL=50pF, RL=500Ω
9
OPERATING CHARACTERISTICS
PARAMETER
SYMBOL
Cpd
TEST CONDITIONS
TYP UNIT
Power dissipation capacitance per
buffer/driver
VCC = 5V, f=1MHz, CL=50pF
45
pF
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U74AC244
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
3.3V±0.3V
5V±0.5V
V
IN
V
Input
V
M
M
0 V
V
t
PHL
t
PLH
OH
Output
V
V
M
M
V
V
OL
t
t
PHL
PLH
OH
V
V
M
M
Output
V
OL
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U74AC244
CMOS IC
TEST CIRCUIT AND WAVEFORMS (Cont.)
VIN
Input
VM
VM
0V
tPZL
tPZL
VLOAD/2
Output
S 1 at VLOAD
VM
VOL
tPZH
tPZH
VOH
VM
Output
S 1 at Open
0V
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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