Texas Instruments SN54HC21J, SN74HC21D, SN74HC21DR, SN74HC21N, SNJ54HC21FK Datasheet
...
SN54HC21, SN74HC21
DUAL 4-INPUT POSITIVE-AND GATES
SCLS087C – DECEMBER 1982 – REVISED MA Y 1997
D
Package Options Include Plastic
Small-Outline (D) and Ceramic Flat (W)
Packages, Ceramic Chip Carriers (FK), and
Standard Plastic (N) and Ceramic (J)
300-mil DIPs
description
These devices contain two independent 4-input
AND gates. They perform the Boolean function
Y+A • B • C • Dor Y+A)B)C)D
in positive logic.
The SN54HC21 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74HC21 is characterized for
operation from –40°C to 85°C.
FUNCTION TABLE
(each gate)
INPUTS
A B C D
H H H H H
L XXX L
X LXX L
X XLX L
X X X L L
OUTPUT
SN54HC21 . . . J OR W PACKAGE
SN74HC21 ...D OR N PACKAGE
SN54HC21 . . . FK PACKAGE
NC
NC
1C
Y
NC
1D
NC – No internal connection
(TOP VIEW)
1A
1
1B
2
NC
3
1C
4
1D
5
6
1Y
GND
7
(TOP VIEW)
1B1ANC
3212019
4
5
6
7
8
910111213
1Y
GND
NC
14
13
12
11
10
9
8
CC
V
2Y
V
2D
2C
NC
2B
2A
2Y
2D
18
17
16
15
14
2A
CC
2C
NC
NC
NC
2B
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, N, and W packages.
†
1
1A
2
1B
4
1C
5
1D
9
2A
10
2B
12
2C
13
2D
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
&
6
1Y
8
2Y
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1997, Texas Instruments Incorporated
1
SN54HC21, SN74HC21
UNIT
DUAL 4-INPUT POSITIVE-AND GATES
SCLS087C – DECEMBER 1982 – REVISED MA Y 1997
logic diagram (positive logic)
1
1A
2
1B
4
1C
5
1D
Pin numbers shown are for the D, J, N, and W packages.
68
1Y
absolute maximum ratings over operating free-air temperature range
2A
2B
2C
2D
10
12
13
9
2Y
†
Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
(VO = 0 to VCC) ±25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
Continuous current through VCC or GND ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): D package 127°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 78°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with EIA/JEDEC Std JESD51, except for through-hole packages,
which use a trace length of zero.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
recommended operating conditions
SN54HC21 SN74HC21
MIN NOM MAX MIN NOM MAX
V
V
V
V
V
t
t
T
Supply voltage 2 5 6 2 5 6 V
CC
VCC = 2 V 1.5 1.5
High-level input voltage
IH
Low-level input voltage
IL
Input voltage 0 V
I
Output voltage 0 V
O
Input transition (rise and fall) time
Operating free-air temperature –55 125 –40 85 °C
A
VCC = 4.5 V
VCC = 6 V 4.2 4.2
VCC = 2 V 0 0.5 0 0.5
VCC = 4.5 V
VCC = 6 V 0 1.8 0 1.8
VCC = 2 V 0 1000 0 1000
VCC = 4.5 V
VCC = 6 V 0 400 0 400
3.15 3.15
0 1.35 0 1.35
CC
CC
0 500 0 500
0 V
0 V
CC
CC
V
V
V
V
ns
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Loading...