Datasheet

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.
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.
„
TSSOP-20
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
Halogen Free
U74AC244L-P20-R
U74AC244G- P20-R
U74AC244L- P20-T
U74AC244G- P20-T
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
Package
Packing
TSSOP-20
TSSOP-20
Tape Reel
Tube
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U74AC244
CMOS IC
„
PIN CONFIGURATION
„
FUNCTION TABLE (each buffer)
INPUTS
„
OE
A
OUTPUT
Y
L
L
H
H
L
X
H
L
Z
LOGIC SYMBOL (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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U74AC244
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CMOS IC
ABSOLUTE MAXIMUM RATING (TA =25°C , unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Supply Voltage
VCC
-0.5~7
V
Input Voltage
VIN
-0.5~VCC +0.5
V
Output Voltage
VOUT
-0.5~VCC +0.5
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
±50
mA
VCC or GND Current
ICC
±200
mA
Storage Temperature
TSTG
-65 ~ +150
°C
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
Junction to Ambient
„
SYMBOL
θJA
RATING
85
UNIT
°C/W
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
SYMBOL
VCC
High-Level Input Voltage
VIH
Low-Level Input Voltage
VIL
Input Voltage
Output Voltage
VCC = 3V
VCC = 4.5V
VCC = 5.5V
VCC = 3V
VCC = 4.5V
VCC = 5.5V
VIN
VOUT
High-level Output Current
IOH
Low-level Output Current
IOL
Input Transition Rise or Fall Rate
Operating Temperature
TEST CONDITIONS
0
0
VCC=3V
VCC=4.5V
VCC=5.5V
VCC=3V
VCC=4.5V
VCC=5.5V
Δt/Δv
TA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
2
2.1
3.15
3.85
-40
MAX
6
UNIT
V
V
0.9
1.35
1.65
VCC
VCC
-12
-24
-24
12
24
24
8
85
V
V
V
mA
mA
ns/V
°C
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U74AC244
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CMOS IC
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
Input Capacitance
ICC
CIN
„
MIN TYP MAX UNIT
2.9
4.4
5.4
V
2.56
3.86
4.86
0.1
0.1
0.1
V
0.36
0.36
0.36
VIN = VCC or GND, VCC = 5.5V
±0.1
VO = VCC or GND, VCC = 5.5V
VI(OE) = VIL or VIH
VIN = VCC or GND, IOUT = 0, VCC = 5.5V
VIN = VCC or GND, VCC=5V
μA
±0.25 μA
4
2.5
μA
pF
SWITCHING CHARACTERISTICS
PARAMETER
Propagation delay from input A to
output Y, tpd
Propagation delay from input OE to
output Y, ten
Propagation delay from input OE to
output Y, tdis
„
TEST CONDITIONS
IOH = -50 μA, VCC = 3V
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
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
SYMBOL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
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
2
1.5
2
1.5
2
1.5
2.5
1.5
3
2.5
2.5
2
TYP
6.5
5
6.5
5
6
5
7.5
5.5
7
6.5
7.5
6.5
MAX UNIT
9
ns
7
9
ns
7
10.5 ns
7
10
ns
8
10
ns
9
10.5 ns
9
OPERATING CHARACTERISTICS
PARAMETER
Power dissipation capacitance per
buffer/driver
SYMBOL
Cpd
TEST CONDITIONS
VCC = 5V, f=1MHz, CL=50pF
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TYP UNIT
45
pF
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CMOS IC
TEST CIRCUIT AND WAVEFORMS
VCC
3.3V±0.3V
5V±0.5V
Inputs
VIN
VCC
VCC
tr, tf
≤2.5ns
≤2.5ns
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
S1
OPEN
VLOAD
Open
VM
VLOAD
CL
RL
VΔ
VCC/2
VCC/2
2*VCC
2*VCC
50pF
50pF
500Ω
500Ω
3.3V±0.3V
5V±0.5V
V IN
Input
VM
VM
0V
tPHL
t PLH
V OH
Output
VM
VM
V OL
tPHL
t PLH
V OH
Output
VM
VM
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
Output
S 1 at Open
VM
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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