SN54HC21J [TI]
DUAL 4-INPUT POSITIVE-AND GATES; 双路4输入正与门
| 型号： | SN54HC21J |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | DUAL 4-INPUT POSITIVE-AND GATES |
| 文件： | 总5页 (文件大小：80K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54HC21, SN74HC21
DUAL 4-INPUT POSITIVE-AND GATES
SCLS087C – DECEMBER 1982 – REVISED MAY 1997
SN54HC21 . . . J OR W PACKAGE
SN74HC21 . . . D OR N PACKAGE
(TOP VIEW)
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
1A
1B
V
CC
1
2
3
4
5
6
7
14
13
12
11
2D
2C
NC
NC
1C
description
These devices contain two independent 4-input
AND gates. They perform the Boolean function
1D
10 2B
9
8
1Y
2A
2Y
GND
Y
A • B • C • D or Y
A
B
C
D
in positive logic.
SN54HC21 . . . FK PACKAGE
(TOP VIEW)
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.
3
2
1
20 19
18
2C
NC
NC
NC
NC
1C
NC
1D
4
5
6
7
8
FUNCTION TABLE
(each gate)
17
16
INPUTS
OUTPUT
Y
15 NC
14
9 10 11 12 13
A
H
L
B
C
H
X
X
L
D
H
X
X
X
L
2B
H
X
L
H
L
L
L
L
X
X
X
X
X
NC – No internal connection
X
†
logic symbol
1
1A
1B
1C
1D
2A
2B
2C
2D
&
2
6
4
1Y
5
9
10
12
13
8
2Y
†
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.
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.
Copyright 1997, Texas Instruments Incorporated
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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HC21, SN74HC21
DUAL 4-INPUT POSITIVE-AND GATES
SCLS087C – DECEMBER 1982 – REVISED MAY 1997
logic diagram (positive logic)
1
9
10
12
13
1A
2A
2B
2C
2D
2
1B
1C
1D
6
8
1Y
2Y
4
5
Pin numbers shown are for the D, J, N, and W packages.
†
absolute maximum ratings over operating free-air temperature range
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
CC
I
Input clamp current, I (V < 0 or V > V ) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
IK
I
CC
Output clamp current, I
(V < 0 or V > V ) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
OK
O O CC
Continuous output current, I (V = 0 to V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25 mA
Continuous current through V
Package thermal impedance, θ (see Note 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127°C/W
O
O
CC
CC
or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
JA
N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78°C/W
Storage temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
†
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.
recommended operating conditions
SN54HC21
SN74HC21
UNIT
MIN NOM
MAX
MIN NOM
MAX
V
V
Supply voltage
2
1.5
3.15
4.2
0
5
6
2
1.5
3.15
4.2
0
5
6
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 2 V
High-level input voltage
= 4.5 V
= 6 V
V
V
IH
= 2 V
0.5
1.35
1.8
0.5
1.35
1.8
V
IL
Low-level input voltage
= 4.5 V
= 6 V
0
0
0
0
V
V
Input voltage
0
V
V
0
V
V
V
V
I
CC
CC
Output voltage
0
0
O
CC
CC
V
CC
V
CC
V
CC
= 2 V
0
1000
500
400
125
0
1000
500
400
85
t
Input transition (rise and fall) time
Operating free-air temperature
= 4.5 V
= 6 V
0
0
ns
t
0
0
T
–55
–40
°C
A
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HC21, SN74HC21
DUAL 4-INPUT POSITIVE-AND GATES
SCLS087C – DECEMBER 1982 – REVISED MAY 1997
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
T
= 25°C
SN54HC21
SN74HC21
A
PARAMETER
TEST CONDITIONS
V
UNIT
CC
MIN
TYP
MAX
MIN
1.9
4.4
5.9
3.7
5.2
MAX
MIN
1.9
MAX
2 V
4.5 V
6 V
1.9 1.998
4.4 4.499
5.9 5.999
I
= –20 µA
4.4
OH
V
V = V or V
IH
5.9
V
OH
OL
I
IL
IL
I
I
= –4 mA
4.5 V
6 V
3.98
5.48
4.3
5.8
3.84
5.34
OH
= –5.2 mA
OH
2 V
0.002
0.001
0.001
0.17
0.1
0.1
0.1
0.1
0.1
0.1
I
= 20 µA
4.5 V
6 V
OL
V
V = V or V
0.1
0.1
0.1
V
I
IH
I
I
= 4 mA
4.5 V
6 V
0.26
0.26
±100
2
0.4
0.33
0.33
±1000
20
OL
= 5.2 mA
0.15
0.4
OL
I
I
V = V
I
or 0
6 V
±0.1
±1000
40
nA
µA
pF
I
CC
CC
V = V
I
or 0,
I
O
= 0
6 V
CC
C
2 V to 6 V
3
10
10
10
i
switching characteristics over recommended operating free-air temperature range, C = 50 pF
L
(unless otherwise noted) (see Figure 1)
T
A
= 25°C
TYP
44
SN54HC21
MIN MAX
SN74HC21
MIN MAX
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
V
UNIT
CC
MIN
MAX
110
22
2 V
4.5 V
6 V
165
33
140
28
24
95
19
16
t
A, B, C, or D
Y
Y
14
ns
pd
t
11
19
28
2 V
29
75
110
22
t
4.5 V
6 V
10
15
ns
8
13
19
operating characteristics, T = 25°C
A
PARAMETER
Power dissipation capacitance per gate
TEST CONDITIONS
TYP
UNIT
C
No load
25
pF
pd
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54HC21, SN74HC21
DUAL 4-INPUT POSITIVE-AND GATES
SCLS087C – DECEMBER 1982 – REVISED MAY 1997
PARAMETER MEASUREMENT INFORMATION
V
CC
From Output
Under Test
Test
Point
Input
50%
50%
0 V
C
= 50 pF
L
t
t
PLH
PHL
90%
(see Note A)
V
V
OH
In-Phase
Output
90%
t
50%
10%
50%
10%
LOAD CIRCUIT
OL
t
r
f
f
t
t
PLH
PHL
90%
V
CC
V
V
90%
t
90%
OH
Input
50%
10%
50%
10%
90%
t
Out-of-Phase
Output
50%
10%
50%
10%
0 V
OL
t
r
f
t
r
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
NOTES: A.
B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, Z = 50 Ω, t = 6 ns, t = 6 ns.
C includes probe and test-fixture capacitance.
L
O
r
f
C. The outputs are measured one at a time with one input transition per measurement.
D. and t are the same as t
t
.
pd
PLH
PHL
Figure 1. Load Circuit and Voltage Waveforms
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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any product or service without notice, and advise customers to obtain the latest version of relevant information
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pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
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Copyright 1998, Texas Instruments Incorporated
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