Datasheet > 74LS221

74LS221

更新时间： 2024-09-24 22:53:15

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
8页	124K
描述
LOW POWER SCHOTTKY

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中文翻译

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数据手册

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74LS221 数据手册

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.

http://onsemi.com

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

LOW

POWER

SCHOTTKY

to V 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 R = 2.0 kΩ and C

= 0, a typical output pulse of 30 nanoseconds is achieved. Output rise

and fall times are independent of pulse length.

ext

Pulse width stability is achieved through internal compensation and

PLASTIC

N SUFFIX

CASE 648

is virtually independent of V 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 V

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:

t (out) = C

ln 2.0 ≈ 0.7 C

R ; where t is in ns if C is in

ext ext W ext

ext ext

pF and R is in kΩ. If pulse cutoff is not critical, capacitance up to

ext

SOIC

D SUFFIX

CASE 751B

1000 µF and resistance as low as 1.4 kΩ may be used. The range of

jitter-free pulse widths is extended if V

temperature.

is 5.0 V and 25°C

• SN74LS221 is a Dual Highly Stable One-Shot

• Overriding Clear Terminates Output Pulse

• Pin Out is Identical to SN74LS123

ORDERING INFORMATION

GUARANTEED OPERATING RANGES

Device

Package

16 Pin DIP

16 Pin

Shipping

Symbol

Parameter

Supply Voltage

Min

4.75

Typ

5.0

Max

5.25

Unit

SN74LS221N

SN74LS221D

2000 Units/Box

2500/Tape & Reel

Operating Ambient

Temperature Range

°C

Output Current – High

Output Current – Low

–0.4

8.0

Semiconductor Components Industries, LLC, 1999

Publication Order Number:

December, 1999 – Rev. 6

SN74LS221/D

12 3 4 5 6 7 8

中文翻译

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与74LS221相关器件

型号	品牌	获取价格	描述	数据表
74LS221B	NXP	获取价格	IC MONOSTABLE MULTIVIBRATOR, PDIP16, Prescaler/Multivibrator
74LS221N	MOTOROLA	获取价格	DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
74LS221N	ONSEMI	获取价格	LOW POWER SCHOTTKY
74LS22D	TI	获取价格	LS SERIES, DUAL 4-INPUT NAND GATE, PDSO14
74LS22DC	FAIRCHILD	获取价格	NAND Gate, TTL, CDIP14,
74LS22DCQM	FAIRCHILD	获取价格	NAND Gate, TTL, CDIP14,
74LS22DCQR	FAIRCHILD	获取价格	NAND Gate, TTL, CDIP14,
74LS22DR	TI	获取价格	LS SERIES, DUAL 4-INPUT NAND GATE, PDSO14
74LS22FCQR	FAIRCHILD	获取价格	NAND Gate, TTL, CDFP14,
74LS22J	TI	获取价格	暂无描述

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