UNISONIC TECHNOLOGIES CO., LTD
U74AHC374
CMOS IC
www.unisonic.com.tw 1 of 6
Copyright © 2011 Unisonic Technologies Co., Ltd QW-R502-656.A
OCTAL EDGE-TRIGGERED
D-TYPE FLIP-FLOPS WITH
3-STATE OUTPUTS
DESCRIPTION
The U74AHC374 is a octal edge-triggered D-type flip-flops with
3-state outputs and it has 8 channels.
When the OE input is low, on the positive transition of the clock
(CLK) input, the Q outputs are set to the logic levels of the data (D)
inputs.
When the OE input is high, the outputs are in the
high-impedance.
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
* Max tPD of 12.7ns at VCC=3.3V, CL=15pF
* Max ICC of 4uA
* Typ VOL< 0.36V at VCC=4.5V,IO=8mA,TA=25°C
* Typ VOH> 3.94V at VCC=4.5V,IO=-8mA, TA=25°C
TSSOP-20
ORDERING INFORMATION
Ordering Number
Lead Free Halogen Free Package Packing
U74HC374L-P20-R U74HC374G-P20-R TSSOP-20 Tape Reel
U74HC374L-P20-T U74HC374G-P20-T TSSOP-20 Tube
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CMOS IC
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PIN CONFIGURATION
FUNCTION TABLE
INPUTS( OE ) INPUTS(CLK) INPUTS(D) OUTPUT(Q)
L ↑ H H
L ↑ L L
L H or L X Q0
H X X Z
LOGIC SYMBOL
1
3
4
7
8
13
14
17
18
11
19
16
15
12
9
6
5
21Q
2Q
8Q
CLK
3Q
4Q
5Q
6Q
7Q
2D
3D
4D
5D
6D
7D
8D
1D1D
EN
C1
OE
LOGIC DIAGRAM
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CMOS IC
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ABSOLUTE MAXIMUM RATING
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage VCC -0.5 ~ 7 V
Input Voltage VIN -0.5 ~ 7 V
Output Voltage VOUT -0.5 ~ VCC +0.5 V
VCC or GND Current ICC ±75 mA
Output Current IOUT ±25 mA
Input Clamp Current IIK -20 mA
Output Clamp Current IOK ±20 mA
Operating Temperature TOPR -40 ~ + 85 ℃
Storage Temperature TSTG -65 ~ + 150 ℃
Note: 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.
RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Supply Voltage VCC 2 5.5 V
VCC=2V 1.5
VCC=3V 2.1
High-level Input Voltage VIH
VCC=5.5V 3.85
V
VCC=2V 0.5
VCC=3V 0.9
Low-level Input Voltage VIL
VCC=5.5V 1.65
V
Input Voltage VIN 0 VCC V
Output Voltage VOUT High or low state 0 VCC V
VCC = 2 V -50 μA
VCC = 3.3 V ± 0.3 V -4
High-level Output Current IOH
VCC = 5 V ± 0.5 V -8 mA
VCC = 2 V 50 μA
VCC = 3.3 V ± 0.3 V 4
Low-level Output Current IOL
VCC = 5 V ± 0.5 V 8 mA
VCC = 3.3 V ± 0.3 V 100
Input Rise or Fall Times tR, tF VCC = 5 V ± 0.5 V 20 ns
ELECTRICAL CHARACTERISTICS (TA=25℃)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
VCC=2V, IOH=-50μA 1.9 2
VCC=3V, IOH=-50μA 2.9 3
VCC=4.5V, IOH=-50μA 4.4 4.5
VCC=3V, IOH=-4mA 2.58
Output Voltage High-Level VOH
VCC=4.5V, IOH=-8mA 3.94
V
VCC=2V, IOH=50μA 0.1
VCC=3V, IOH=50μA 0.1
VCC=4.5V, IOH=50μA 0.1
VCC=3V, IOH=4mA 0.36
Output Voltage Low-Level VOL
VCC=4.5V, IOH=8mA 0.36
V
Input Leakage Current II(LEAK) V
CC= 0 to 5.5V, VIN=5.5V or GND ±0.1 μA
3-state Leakage Current IOZ V
CC=5.5V, VOUT= VCC or GND ±0.25 μA
Quiescent Supply Current ICC V
CC=5.5V, VIN=VCC or GND, IOUT=0 4 μA
Input Capacitance CI V
CC=5V, VIN=VCC or GND 4 10 pF
Output Capacitance CO V
CC=5V, VOUT=VCC or GND 6 pF
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SWITCHING CHARACTERISTICS (See TEST CIRCUIT AND WAVEFORMS)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
CL =15pF 8.1 12.7
VCC = 3.3V ± 0.3V CL =50pF 10.6 16.2
CL =15pF 5.4 8.1
From CLK to Q tPLH/tPHL
VCC = 5V ± 0.5V CL =50pF 6.9 10.1
ns
CL =15pF 7.1 11
VCC = 3.3V ± 0.3V CL =50pF 9.6 14.5
CL =15pF 5.1 7.6
From OE to Q tPZL/tPZH
VCC = 5V ± 0.5V CL =50pF 6.6 9.6
ns
CL =15pF 7.5 10.5
VCC = 3.3V ± 0.3V CL =50pF 10.2 14
CL =15pF 4.6 6.8
From OE to Q tPLZ/tPHZ
VCC = 5V ± 0.5V CL =50pF 6.1 8.8
ns
CL =15pF 80 130
VCC = 3.3V ± 0.3V CL =50pF 55 85
CL =15pF 130 185
Maximum Clock Frequency fMAX
VCC = 5V ± 0.5V CL =50pF 85 120
MHz
VCC = 3.3 V ± 0.3 V 5
Pulse Width tW VCC = 5 V ± 0.5 V 5 ns
VCC = 3.3 V ± 0.3 V 4.5
Setup Time tSU VCC = 5 V ± 0.5 V 3 ns
VCC = 3.3 V ± 0.3 V 2
Hold Time tH VCC = 5 V ± 0.5 V 2 ns
OPERATING CHARACTERISTICS(TA=25°С)
PARAMETER SYMBOL TEST CONDITIONS RATINGS UNIT
Power Dissipation Capacitance CPD No load, VCC = 5 V, f=1MHz 32 pF
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TEST CIRCUIT AND WAVEFORMS
TEST S1
tPLH/tPHL Open
tPLZ/tPZL V
LOAD
tPHZ/tPZH GND
Input
VCC VIN t
R, tF VM V
LOAD C
L R
L VΔ
15pF
3.3V±0.3V VCC ≤3ns VCC/2 VCC 50pF 1kΩ 0.3V
15pF
5V±0.5V VCC ≤3ns VCC/2 VCC 50pF 1kΩ 0.5V
VM
VIN
0
V
Pulse Duration
tW
Input VM
VIN
0V
Setup and Hold Times
tSU
VM
Timing Input
Data Input
tH
VMVM
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TEST CIRCUIT AND WAVEFORMS(Cont.)
VM
VIN
0V
VOH
VOL
Voltage Waveforms Propagation Delay Times
Input
Output
tPLH tPHL
tPLH
tPHL
Output
VM
VM
VM
VM
VM
VOH
VOL
Note: A. CL includes probe and jig capacitance.
Note: B. 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.
