Datasheet

UNISONIC TECHNOLOGIES CO., LTD
U74AHC373
CMOS IC
OCTAL TRANSPARENT
D-TYPE LATCHES WITH
3-STATE OUTPUTS

DESCRIPTION
The U74AHC373 is an octal transparent D-type latch with
3-state outputs, and it has 8 channels.
When the OE input is low and the LE input is high, the Q
outputs follow the D inputs. When OE is low and LE is low, the
Q outputs are latched at the logic levels of the D inputs.
When the OE input is high, the outputs are in the
high-impedance. The OE does not affect the internal operations
of the latches. Old data can be retained or new data can be
entered while the outputs are in the high-impedance state.
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
* Operate from 2V to 5.5V
* Inputs Accept Voltages to 5.5V
* Max tPD of 13.5ns at VCC=3.3V, CL=15pF
* Typ VOL< 0.36V at VCC=3V, IOL=4mA, TA=25°C
* Typ VOH> 2.58V at VCC=3V, IOH=-4mA, TA=25°C

ORDERING INFORMATION
Ordering Number
U74AHC373G-R20-T
U74AHC373G-P20-R

Package
SSOP-20
TSSOP-20
Packing
Tube
Tape Reel
MARKING
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Copyright © 2015 Unisonic Technologies Co., Ltd
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U74AHC373

CMOS IC
PIN CONFIGURATION
1
20
VCC
1Q
2
19
8Q
1D
3
18
8D
2D
4
17
7D
2Q
5
16
7Q
3Q
6
15
6Q
3D
7
14
6D
4D
8
13
5D
4Q
9
12
5Q
GND
10
11
LE
OE

FUNCTION TABLE
INPUTS( OE )
INPUTS(LE)
INPUTS(D)
L
H
H
L
H
L
L
L
X
H
X
X
Note: H: HIGH voltage level; L: LOW voltage level.

LOGIC SYMBOL

LOGIC DIAGRAM
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OUTPUT(Q)
H
L
Q0
Z
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CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply voltage
VCC
-0.5 ~ 7
V
Input voltage (Note 2)
VI
-0.5 ~ 7
V
Output voltage (Note 2)
VO
-0.5 ~ VCC +0.5
V
Input clamp current
IIK
-20
mA
Output clamp current
IOK
±20
mA
Output current
IO
±25
mA
VCC or GND current
ICC
±75
mA
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 CONDITIONS
PARAMETER
Supply Voltage
SYMBOL
VCC
High-Level Input Voltage
VIH
Low-Level Input Voltage
VIL
Input Voltage
Output Voltage
IOH
Low-Level Output Current
IOL

VCC = 2 V
VCC = 3 V
VCC = 5.5V
VCC = 2 V
VCC = 3 V
VCC = 5.5V
VIN
VOUT
High-Level Output Current
Input Rise or Fall Times
TEST CONDITIONS
tR, tF
MIN
2
1.5
2.1
3.85
TYP
MAX
5.5
UNIT
V
V
0.5
0.9
1.65
5.5
VCC
-50
-4
-8
50
4
8
100
20
0
0
VCC = 2 V
VCC = 3.3 V ± 0.3 V
VCC = 5 V ± 0.5 V
VCC = 2 V
VCC = 3.3 V ± 0.3 V
VCC = 5 V ± 0.5 V
VCC = 3.3 V ± 0.3 V
VCC = 5 V ± 0.5 V
V
V
V
μA
mA
μA
mA
ns/V
ELECTRICAL CHARACTERISTICS (TA=25°C)
PARAMETER
Output Voltage High-Level
Output Voltage Low-Level
Input Leakage Current
Leakage Current (For output in
high-impedance state)
SYMBOL
VOH
VOL
II(LEAK)
IOZ
Quiescent Supply Current
IQ
Input Capacitance
Output Capacitance
CI
CO
TEST CONDITIONS
VCC=2V, IOH=-50μA
VCC=3V, IOH=-50μA
VCC=4.5V, IOH=-50μA
VCC=3V, IOH=-4mA
VCC=4.5V, IOH=-8mA
VCC=2V, IOL=50μA
VCC=3V, IOL=50μA
VCC=4.5V, IOL=50μA
VCC=3V, IOL=4mA
VCC=4.5V, IOL=8mA
VCC=0V to 5.5V, VIN=0 or 5.5V
VCC=5.5V, VIN=VIH or VIH,
VOUT=0 or 5.5V
VCC=5.5V, VIN=VCC or GND,
IOUT=0
VCC=5V, VIN=VCC or GND
VCC=5V, VOUT=VCC or GND
UNISONIC TECHNOLOGIES CO., LTD
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MIN
1.9
2.9
4.4
2.58
3.94
TYP
MAX
UNIT
V
4
6
0.1
0.1
0.1
0.36
0.36
±0.1
μA
±0.25
μA
4
μA
10
pF
pF
V
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CMOS IC
SWITCHING CHARACTERISTICS
PARAMETER
SYMBOL
From D to Q
tPLH/tPHL
From LE to Q
From OE to Q
tPZL/tPZH
From OE to Q
tPLZ/tPHZ
Pulse Width, LE high
tW
Setup Time, data before LE↓
tSU
Hold Time, data after LE↓
tH

TEST CONDITIONS
VCC=3.3V±0.3V, CL=15pF
VCC=3.3V±0.3V, CL=50pF
VCC=5V±0.5V, CL=15pF
VCC=5V±0.5V, CL=50pF
VCC=3.3V±0.3V, CL=15pF
VCC=3.3V±0.3V, CL=50pF
VCC=5V±0.5V, CL=15pF
VCC=5V±0.5V, CL=50pF
VCC=3.3V±0.3V, CL=15pF
VCC=3.3V±0.3V, CL=50pF
VCC=5V±0.5V, CL=15pF
VCC=5V±0.5V, CL=50pF
VCC=3.3V±0.3V, CL=15pF
VCC=3.3V±0.3V, CL=50pF
VCC=5V±0.5V, CL=15pF
VCC=5V±0.5V, CL=50pF
VCC=3.3V±0.3V
VCC=5V±0.5V
VCC=3.3V±0.3V
VCC=5V±0.5V
VCC=3.3V±0.3V
VCC=5V±0.5V
MIN
TYP
7.3
9.8
5
6.5
7
9.5
4.9
6.4
7.3
9.8
5.5
7
7
9.5
5
6.5
5
5
4
4
1
1
MAX
11.4
14.9
7.2
9.2
11
14.5
7.2
9.2
11.4
14.9
8.1
10.1
10
13.2
7.2
9.2
UNIT
ns
ns
ns
ns
ns
ns
OPERATING CHARACTERISTICS (TA=25°С)
PARAMETER
Power Dissipation Capacitance
SYMBOL
TEST CONDITIONS
CPD
No load, f=1MHz
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RATINGS
18
UNIT
pF
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CMOS IC
TEST CIRCUIT AND WAVEFORMS
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
VCC
Input
VM
VLOAD
≤3ns
VCC/2
VCC
≤3ns
VCC/2
VCC
VIN
tR, tF
3.3V±0.3V
VCC
5V±0.5V
VCC
UNISONIC TECHNOLOGIES CO., LTD
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CL
15pF
50pF
15pF
50pF
S1
Open
VLOAD
GND
RL
V∆
1kΩ
0.3V
1kΩ
0.5V
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U74AHC373

CMOS IC
TEST CIRCUIT AND WAVEFORMS(Cont.)
VIN
Input
VM
VM
tPLH
tPHL
0V
VOH
Output
VM
VM
VOL
tPLH
tPHL
VOH
VM
Output
VM
VOL
Voltage Waveforms Propagation Delay Times
Notes: 1. CL includes probe and jig capacitance.
2. PRR ≤1MHz, ZO = 50Ω, tR ≤3ns, tF ≤3ns.
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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www.unisonic.com.tw
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