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  ON Semiconductor Electronic Components Datasheet  

SN74LS221 Datasheet

Dual Monostable Multivibrators

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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 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
TA Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0 25 70 °C
IOH Output Current High
IOL Output Current Low
0.4
8.0
mA
mA
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
SOIC16
38 Units/Rail
SN74LS221DR2 SOIC16 2500/Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 8
1
Publication Order Number:
SN74LS221/D


  ON Semiconductor Electronic Components Datasheet  

SN74LS221 Datasheet

Dual Monostable Multivibrators

No Preview Available !

SN74LS221
(TOP VIEW)
1 Rext/
1
2
Cext Cext
CLR
VCC 1Q 2Q
16 15 14 13 12 11
2B
10
Q
Q
CLR CLR
Q
Q
2A
9
1 2 3 4 56 78
1A
1B
1
CLR
1Q
2Q
2
Cext
GND2CReexxtt/
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.
VCC
Rext
+
Cext R/C
FUNCTION TABLE
(EACH MONOSTABLE)
INPUTS
OUTPUTS
CLEAR A B
Q
Q
L XX
X HX
X XL
H L°
H ±H
L
L
L
H
H
H
*° L H
*See operational notes — Pulse Trigger Modes
TYPE
SN74LS221
TYPICAL
POWER
DISSIPATION
23 mW
MAXIMUM
OUTPUT PULSE
LENGTH
70 s
http://onsemi.com
2


Part Number SN74LS221
Description Dual Monostable Multivibrators
Maker ON Semiconductor
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SN74LS221 Datasheet PDF






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