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參數資料
| 型號： | 31402B2A |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT TRIGGER INPUTS |
| 中文描述： | 施密特觸發輸入與雙單穩態多頻振蕩器 |
| 文件頁數： | 1/23頁 |
| 文件大小： | 620K |
| 代理商： | 31402B2A |
SDLS213B DECEMBER 1983 REVISED NOVEMBER 2004
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Dual Versions of Highly Stable SN54121
and SN74121 One Shots
SN54221 and SN74221 Demonstrate
Electrical and Switching Characteristics
That Are Virtually Identical to the SN54121
and SN74121 One Shots
Pinout Is Identical to the SN54123,
SN74123, SN54LS123, and SN74LS123
Overriding Clear Terminates Output Pulse
TYPE
MAXIMUM
OUTPUT
PULSE
LENGTH(S)
21
SN54221
SN74221
28
SN54LS221
49
SN74LS221
70
description/ordering information
The ’221 and ’LS221 devices are dual
multivibrators with performance characteristics
virtually identical to those of the ’121 devices.
Each multivibrator features a negative-transition-
triggered input and a positive-transition-triggered
input, either of which can be used as an inhibit
input.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP N
Tube
SN74221N
SN74221N
SN74LS221N
SN74LS221N
0
°
C to 70
°
C
SOIC D
Tube
SN74LS221D
LS221
Tape and reel
SN74LS221DR
SOP NS
Tape and reel
SN74LS221NSR
74LS221
SSOP DB
Tape and reel
SN74LS221DBR
LS221
CDIP J
Tube
SNJ54221J
SNJ54221J
55 C to 125 C
SNJ54LS221J
SNJ54LS221J
LCCC FK
Tube
SNJ54LS221FK
SNJ54LS221FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright
2004, Texas Instruments Incorporated
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3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
1C
ext
1Q
NC
2Q
2CLR
1CLR
1Q
NC
2Q
2C
ext
1
1
N
2
2
V
1
e
2
G
N
1A
1B
1CLR
1Q
2Q
2C
ext
2R
ext
/C
ext
GND
V
CC
1R
ext
/C
ext
1C
ext
1Q
2Q
2CLR
2B
2A
SN54221, SN54LS221 . . . J PACKAGE
SN74221 . . . N PACKAGE
SN74LS221 . . . D, DB, N, OR NS PACKAGE
(TOP VIEW)
SN54LS221 . . . FK PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
e
/
e
/
e
NC No internal connection
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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.
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