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參數資料
| 型號： | DM74LS221 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |
| 中文描述： | 雙非Retriggerable一個明確和互補輸出鉛球 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 108K |
| 代理商： | DM74LS221 |
2000 Fairchild Semiconductor Corporation
DS006409
www.fairchildsemi.com
August 1986
Revised April 2000
D
DM74LS221 Dual Non-Retriggerable One-Shot
with Clear and Complementary Outputs
General Description
The DM74LS221 is a dual monostable multivibrator with
Schmitt-trigger input. Each device has three inputs permit-
ting the choice of either leading-edge or trailing-edge trig-
gering. Pin (A) is an active-LOW trigger transition input and
pin (B) is an active-HIGH transition Schmitt-trigger input
that allows jitter free triggering for inputs with transition
rates as slow as 1 volt/second. This provides the input with
excellent noise immunity. Additionally an internal latching
circuit at the input stage also provides a high immunity to
V
CC
noise. The clear (CLR) input can terminate the output
pulse at a predetermined time independent of the timing
components. This (CLR) input also serves as a trigger
input when it is pulsed with a low level pulse transition
(
). To obtain the best and trouble free operation from
this device please read operating rules as well as the Fair-
child Semiconductor one-shot application notes carefully
and observe recommendations.
Features
I
A dual, highly stable one-shot
I
Compensated for V
CC
and temperature variations
I
Pin-out identical to DM74LS123 (Note 1)
I
Output pulse width range from 30 ns to 70 seconds
I
Hysteresis provided at (B) input for added noise
immunity
I
Direct reset terminates output pulse
I
Triggerable from CLEAR input
I
DTL, TTL compatible
I
Input clamp diodes
Note 1:
The pin-out is identical to DM74LS123 but, functionally it is not;
refer to Operating Rules #10 in this datasheet.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
H
=
HIGH Logic Level
L
=
LOW Logic Level
X
=
Can Be Either LOW or HIGH
↑
=
Positive Going Transition
↓
=
Negative Going Transition
=
A Positive Pulse
=
A Negative Pulse
Note 2:
This mode of triggering requires first the B input be set from a
LOW-to-HIGH level while the CLEAR input is maintained at logic LOW
level. Then with the B input at logic HIGH level, the CLEAR input whose
positive transition from LOW-to-HIGH will trigger an output pulse.
Order Number
DM74LS221M
DM74LS221SJ
DM74LS221N
Package Number
M16A
M16D
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Outputs
CLEAR
L
X
X
H
H
↑
(Note 2)
A
X
H
X
L
↓
L
B
X
X
L
↑
H
H
Q
L
L
L
Q
H
H
H
相關PDF資料 |
PDF描述 |
|---|---|
| DM74LS221M | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |
| DM74LS221N | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |
| DM74LS221MX | Monostable Multivibrator |
| DM74LS221SJX | Monostable Multivibrator |
| DM74LS221SJ | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DM74LS221 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DM74LS221M | 功能描述:單穩態多諧振蕩器 Dl Non-Ret One-Shot RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| DM74LS221MX | 功能描述:單穩態多諧振蕩器 Dl Non-Ret One-Shot RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| DM74LS221N | 功能描述:單穩態多諧振蕩器 Dl Non-Ret One-Shot RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| DM74LS221SJ | 功能描述:單穩態多諧振蕩器 Dl Non-Ret One-Shot RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
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