SN74LS221NG

Manufacturer Part NumberSN74LS221NG
ManufacturerON Semiconductor
SN74LS221NG datasheet
 


Specifications of SN74LS221NG

Logic FamilyLSHigh Level Output Current-400uA
Low Level Output Current8mAQuiescent Current11uA
Number Of Elements2Operating Temperature ClassificationCommercial
Operating Supply Voltage (max)5.25VOperating Supply Voltage (typ)5V
Operating Temperature (min)0COperating Temperature (max)70C
TechnologyBipolarAbs. Propagation Delay Time80ns
Operating Supply Voltage (min)4.75VLead Free Status / RoHS StatusCompliant
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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 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 V
noise is also provided by internal latching circuitry.
CC
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
= 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 V
and temperature. In most applications,
CC
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
R
ln 2.0
0.7 C
R
w
ext
ext
ext
pF and R
is in kΩ. If pulse cutoff is not critical, capacitance up to
ext
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.
SN74LS221 is a Dual Highly Stable One-Shot
Overriding Clear Terminates Output Pulse
Pin Out is Identical to SN74LS123
GUARANTEED OPERATING RANGES
Symbol
Parameter
V
Supply Voltage
CC
T
Operating Ambient
A
Temperature Range
I
Output Current − High
OH
I
Output Current − Low
OL
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 8
= 2.0 kΩ and C
ext
ext
CC
; where t
is in ns if C
is in
ext
W
ext
is 5.0 V and 25°C
CC
Min
Typ
Max
Unit
4.75
5.0
5.25
V
0
25
70
°C
−0.4
mA
8.0
mA
1
http://onsemi.com
LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
Package
Shipping
SN74LS221N
16 Pin DIP
2000 Units/Box
SN74LS221D
SOIC−16
38 Units/Rail
SN74LS221DR2
SOIC−16
2500/Tape & Reel
Publication Order Number:
SN74LS221/D

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− ...