SN54LS221

更新时间： 2024-11-18 23:03:03

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		触发器输入元件
页数	文件大小	规格书
7页	196K
描述
DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS

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SN54LS221 数据手册

SN54/74LS221

DUAL MONOSTABLE

MULTIVIBRATORS

WITH SCHMITT-TRIGGER INPUTS

DUAL MONOSTABLE

MULTIVIBRATORS

WITH SCHMITT-TRIGGER 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

LOW POWER SCHOTTKY

with excellent noise immunity. A high immunity to V

by internal latching circuitry.

noise is also provided

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

J SUFFIX

CERAMIC

CASE 620-09

components. With R

= 2.0 kΩ and C

= 0, a typical output pulse of 30

ext

nanoseconds is achieved. Output rise and fall times are independent of pulse

length.

Pulse width stability is achieved through internal compensation and is

N SUFFIX

PLASTIC

CASE 648-08

virtually independent of V

and temperature. In most applications, pulse

stability will only be limited by the accuracy of external timing components.

Jitter-freeoperationismaintainedoverthefulltemperatureandV 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 70 kΩ for the

SN54LS221, and 2.0 to 100 kΩ for the SN74LS221). Pulse width is defined

D SUFFIX

SOIC

CASE 751B-03

bytherelationship:t (out)=C

ln2.0≈0.7C

;wheret isinns

ext ext

if C

ext

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

ext

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

jitter-free pulse widths is extended if V is 5.0 V and 25°C temperature.

• SN54LS221 and SN74LS221 is a Dual Highly Stable One-Shot

• Overriding Clear Terminates Output Pulse

• Pin Out is Identical to SN54/74LS123

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN Plastic

SN74LSXXXD SOIC

FUNCTION TABLE

(EACH MONOSTABLE)

(TOP VIEW)

INPUTS

OUTPUTS

CLEAR

*See operational notes — Pulse Trigger Modes

TYPICAL

POWER

DISSIPATION

23 mW

MAXIMUM

TYPE

OUTPUT PULSE

LENGTH

49 s

positive logic: Low input to clear resets Q low and

positive logic: Q high regardless of dc levels at A

positive logic: or B inputs.

SN54LS221

SN74LS221

23 mW

70 s

FAST AND LS TTL DATA

5-380

12 3 4 5 6 7

中文翻译

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与SN54LS221相关器件

型号	品牌	获取价格	描述	数据表
SN54LS221FK	TI	获取价格	DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN54LS221J	MOTOROLA	获取价格	DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN54LS221J	TI	获取价格	DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN54LS221JD	MOTOROLA	获取价格	Monostable Multivibrator, LS Series, 2-Func, TTL, CDIP16, CERAMIC, DIP-16
SN54LS221W	TI	获取价格	DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
SN54LS222A	TI	获取价格	16 Ã 4 SYNCHRONOUS FIRST-IN, FIRST-OUT MEMOR
SN54LS222AJ	TI	获取价格	16 Ã 4 SYNCHRONOUS FIRST-IN, FIRST-OUT MEMOR
SN54LS224A	TI	获取价格	16 Ã 4 SYNCHRONOUS FIRST-IN, FIRST-OUT MEMOR
SN54LS224AJ	TI	获取价格	16 Ã 4 SYNCHRONOUS FIRST-IN, FIRST-OUT MEMOR
SN54LS224J	TI	获取价格	16X4 OTHER FIFO, CDIP16

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