Document
UNISONIC TECHNOLOGIES CO., LTD U74HCT21
DUAL 4-INPUT AND GATES
DESCRIPTION
The U74HCT21 contains two independent 4-input AND gates. They perform the Boolean function Y=A • B • C • D
or Y=A + B + C + D in positive logic.
FEATURES
* Operation Voltage Range: 4.5V~5.5V
* Low Quiescent Current: ICC=2μA(Max)
* High Speed:
tPD=15ns @ 4.5V (Typ)
* Low Input Current:
100nA Max
* Inputs are TTL Voltage Compatiabel
CMOS IC
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
U74HCT21L-P14-T
U74HCT21G-P14-T
U74HCT21L-P14-R
U74HCT21G-P14-R
Package
TSSOP-14 TSSOP-14
Packing
Tube Tape Reel
www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd
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U74HCT21
PIN CONFIGURATION
1A 1B NC 1C 1D 1Y GND
1 2 3 4 5 6 7
14 VCC 13 2D 12 2C 11 NC 10 2B 9 2A 8 2Y
FUNCTION TABLE
INPUT(A)
H L X X X
INPUT(B) H X L X X
LOGIC DIAGRAM (positive logic)
INPUT(C)
H X X L X
INPUT(D)
H X X X L
CMOS IC
OUTPUT(Y) H L L L L
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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U74HCT21
CMOS IC
ABSOLUTE MAXIMUM RATING (unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC -0.5 ~ 7
Input Clamp Current
IIK -20
Output Clamp Current
IOK ±20
Output Current
IOUT
±25
VCC or GND Current
ICC ±50
Storage Temperature
TSTG
-65 ~ +150
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
V mA mA mA mA
℃
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
PARAMETER Supply Voltage Input Voltage Output Voltage Input Transition Rise or Fall Rate Operating Temperature
SYMBOL VCC VIN VOUT tR, tF TA
CONDITIONS VCC=4.5V
MIN TYP MAX UNIT 4.5 5.5 V 0 Vcc V 0 VCC V
500 ns -40 85 ℃
STATIC CHARACTERISTICS (TA = 25°С)
PARAMETER High-Level Input Voltage Low-Level Input Voltage
High-Level Output Voltage
Low-Level Output Voltage
Input Leakage Current Quiescent Supply Current Additional Quiescent Supply Current Input Capacitance
SYMBOL
TEST CONDITIONS
VIH VCC= 4.5V to 5.5V
VIL VCC= 4.5V to 5.5V
VOH
VCC= 4.5V, IO = -20µA VCC= 4.5V, IO = -4mA
VOL
VCC= 4.5V, IO = 20µA VCC= 4.5V, IO = 4mA
II(LEAK) VCC= 5.5V ,VIN = VCC or GND
ICC VCC= 5.5V, VIN = VCC or GND, IO = 0
△ICC
One input at VCC -2.1V, other inputs at 0 or VCC
CIN VCC=4.5V~5.5V
MIN 2.0
4.4 3.98
TYP
4.999 4.3
0.001 0.17 ±0.1
MAX
0.8
0.1 0.26 ±100
2
UNIT V V
V
V
nA µA
100 360 uA
3 10 pF
DYNAMIC CHARACTERISTICS (TA=25°С, Input: tR=tF=6ns, unless otherwise specified )
PARAMETER Propagation delay from Input(A or B) to Output(Y)
Output Transition Time
SYMBOL
TEST CONDITIONS
tPLH, tPHL VCC=4.5V, CL=50pF tT VCC=4.5V, CL=50pF
MIN TYP MAX UNIT 15 27 ns 7 15 ns
OPERATING CHARACTERISTICS (TA=25°С, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITION
Power Dissipation Capacitance CPD No Load
RATINGS 42
UNIT pF
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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U74HCT21
TEST CIRCUIT AND WAVEFORMS
CL (Note)
Output
Note : CL includes probe and jig capacitance.
CMOS IC
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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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