SN74LS221NG ON Semiconductor, SN74LS221NG Datasheet

SN74LS221NG

Manufacturer Part Number

SN74LS221NG

Description

Manufacturer

ON Semiconductor

Datasheet

1.SN74LS221NG.pdf (7 pages)

Specifications of SN74LS221NG

Logic Family

High Level Output Current

-400uA

Low Level Output Current

8mA

Quiescent Current

11uA

Number Of Elements

Operating Temperature Classification

Commercial

Operating Supply Voltage (max)

5.25V

Operating Supply Voltage (typ)

Operating Temperature (min)

Operating Temperature (max)

70C

Technology

Bipolar

Abs. Propagation Delay Time

80ns

Operating Supply Voltage (min)

4.75V

Lead Free Status / RoHS Status

Compliant

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SN74LS221

Dual Monostable

Multivibrators with

Schmitt−Trigger Inputs

triggered input and a positive-transition-triggered input either of

which can be used as an inhibit input.

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 V

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

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

and fall times are independent of pulse length.

is virtually independent of V

pulse stability will only be limited by the accuracy of external timing

components.

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:

pF and R

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.

•

GUARANTEED OPERATING RANGES

July, 2006 − Rev. 8

Symbol

Each multivibrator of the LS221 features a negative-transition-

Pulse triggering occurs at a voltage level and is not related to the

Once triggered, the outputs are independent of further transitions of

Pulse width stability is achieved through internal compensation and

Jitter-free operation is maintained over the full temperature and V

(out) = C

SN74LS221 is a Dual Highly Stable One-Shot

Overriding Clear Terminates Output Pulse

Pin Out is Identical to SN74LS123

noise is also provided by internal latching circuitry.

ext

Supply Voltage

Operating Ambient

Output Current − High

Output Current − Low

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

Temperature Range

ext

ln 2.0

Parameter

≈

0.7 C

and temperature. In most applications,

ext

4.75

Min

; where t

Typ

5.0

is 5.0 V and 25°C

ext

is in ns if C

= 2.0 kΩ and C

Max

5.25

−0.4

8.0

ext

Unit

°C

is in

ext

SN74LS221N

SN74LS221D

SN74LS221DR2

Device

ORDERING INFORMATION

http://onsemi.com

SCHOTTKY

POWER

CASE 751B

CASE 648

N SUFFIX

D SUFFIX

PLASTIC

16 Pin DIP

LOW

Package

SOIC−16

SOIC

Publication Order Number:

2500/Tape & Reel

2000 Units/Box

38 Units/Rail

SN74LS221/D

Shipping

Related parts for SN74LS221NG

SN74LS221NG Summary of contents

Page 1

SN74LS221 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 ...

Page 2

VIEW) 1 Rext Cext Cext CLR CLR CLR ...

Page 3

Once in the pulse trigger mode, the output pulse width is determined In2, as long ext ext within their minimum and maximum valves and the duty cycle is less than 50%. This ...

Page 4

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE Symbol Parameter Positive-Going Threshold V T+ Voltage at C Input V Negative-Going Threshold T− Voltage at C Input Positive-Going Threshold V T+ Voltage at B Input V Negative-Going Threshold T− Voltage at B Input ...

Page 5

AC CHARACTERISTICS ( From (Input) (Output) Symbol A t PLH PHL B t Clear PHL t Clear PLH W(out) AC SETUP REQUIREMENTS (V = 5.0 ...

Page 6

AC WAVEFORMS t W(in) B INPUT 1.3 V ≥60 ns CLEAR t t PLH Q OUTPUT t PHL Q OUTPUT A INPUT IS LOW. TRIGGER FROM B, THEN CLEAR — CONDITION 1 B INPUT ≥ 1.3 V CLEAR ...

Page 7

... Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303− ...

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