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参数资料
| 型号： | SN74LS221DR2 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 谐振器 |
| 英文描述： | LS SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16 |
| 封装： | PLASTIC, SOIC-16 |
| 文件页数： | 1/7页 |
| 文件大小： | 199K |
| 代理商： | SN74LS221DR2 |
Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 8
1
Publication Order Number:
SN74LS221/D
SN74LS221
Dual Monostable
Multivibrators with
SchmittTrigger Inputs
Each multivibrator of the LS221 features a negative-transition-
triggered input and a positive-transition-triggered input either of
which can be used as an inhibit input.
Pulse triggering occurs at a voltage level and is not related to the
transition time of the input pulse. Schmitt-trigger input circuitry for B
input allows jitter-free triggering for inputs as slow as 1 volt/second,
providing the circuit with excellent noise immunity. A high immunity
to VCC noise is also provided by internal latching circuitry.
Once triggered, the outputs are independent of further transitions of
the inputs and are a function of the timing components. The output
pulses can be terminated by the overriding clear. Input pulse width
may be of any duration relative to the output pulse width. Output pulse
width may be varied from 35 nanoseconds to a maximum of 70 s by
choosing appropriate timing components. With Rext = 2.0 kΩ and Cext
= 0, a typical output pulse of 30 nanoseconds is achieved. Output rise
and fall times are independent of pulse length.
Pulse width stability is achieved through internal compensation and
is virtually independent of VCC and temperature. In most applications,
pulse stability will only be limited by the accuracy of external timing
components.
Jitter-free operation is maintained over the full temperature and VCC
ranges for greater than six decades of timing capacitance (10 pF to 10
μF), and greater than one decade of timing resistance (2.0 to 100 kΩ
for the SN74LS221). Pulse width is defined by the relationship:
tw(out) = CextRext ln 2.0 ≈ 0.7 Cext Rext; where tW is in ns if Cext is in
pF and Rext is in kΩ. If pulse cutoff is not critical, capacitance up to
1000 μF and resistance as low as 1.4 kΩ may be used. The range of
jitter-free pulse widths is extended if VCC is 5.0 V and 25°C
temperature.
SN74LS221 is a Dual Highly Stable One-Shot
Overriding Clear Terminates Output Pulse
Pin Out is Identical to SN74LS123
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
4.75
5.0
5.25
V
TA
Operating Ambient
Temperature Range
0
25
70
°C
IOH
Output Current High
0.4
mA
IOL
Output Current Low
8.0
mA
LOW
POWER
SCHOTTKY
SOIC
D SUFFIX
CASE 751B
PLASTIC
N SUFFIX
CASE 648
16
1
16
1
Device
Package
Shipping
ORDERING INFORMATION
SN74LS221N
16 Pin DIP
2000 Units/Box
SN74LS221D
SOIC16
38 Units/Rail
SN74LS221DR2
SOIC16
2500/Tape & Reel
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74LS221DRE4 | 功能描述:单稳态多谐振荡器 Dual w/Schmitt-trgr inputs RoHS:否 制造商:Texas Instruments 每芯片元件:1 逻辑系列:LVC 逻辑类型:Monostable Multivibrator 封装 / 箱体:SSOP-8 传播延迟时间:18.6 ns 高电平输出电流:- 32 mA 低电平输出电流:32 mA 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
| SN74LS221DRG4 | 功能描述:单稳态多谐振荡器 Dual 单稳态多谐振荡器s RoHS:否 制造商:Texas Instruments 每芯片元件:1 逻辑系列:LVC 逻辑类型:Monostable Multivibrator 封装 / 箱体:SSOP-8 传播延迟时间:18.6 ns 高电平输出电流:- 32 mA 低电平输出电流:32 mA 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
| SN74LS221J | 制造商:ONS 功能描述:ON SEMICONDUCTOR NXC7D |
| SN74LS221JD | 制造商:Motorola Inc 功能描述: |
| SN74LS221N | 功能描述:单稳态多谐振荡器 Dual w/Schmitt-trgr inputs RoHS:否 制造商:Texas Instruments 每芯片元件:1 逻辑系列:LVC 逻辑类型:Monostable Multivibrator 封装 / 箱体:SSOP-8 传播延迟时间:18.6 ns 高电平输出电流:- 32 mA 低电平输出电流:32 mA 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
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