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HD74LS221P Datasheet

Dual Monostable Multivibrators

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HD74LS221
Dual Monostable Multivibrators
REJ03D0458–0300
Rev.3.00
Jul.15.2005
This multivibrator 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 particular voltage level and is not directly related to the
transition time of the input pulse. Schmitt-trigger input circuitry (TTL hysteresis) for B input allows jitter-free
triggering from inputs with transition rates as slow as 1 V/s, providing the circuit with excellent noise immunity of
typically 1.2 V. A high immunity to VCC noise of typically 1.5 V is also provided by internal latching circuitry. Once
fired, the outputs are independent of further transitions of the A and B inputs and are a function of the timing
components, or the output pulses can be terminated by the overriding clear. Input pulses may be of any duration
relative to the output pulse. Output rise and fall times are TTL compatible and independent of pulse length.
Typical triggering and clearing sequence are illustrated as a part of the switching characteristics waveforms. 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 range for more than six decades of timing capacitance (10 pF
to 10 µF) and more than one decade of timing resistance (2 kto 100 k).
Throughout these ranges, pulse width is defined by the relationship: tw (out) = Cext Rext 1n 2.
Features
Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74LS221P
DILP-16 pin
PRDP0016AE-B
(DP-16FV)
P
HD74LS221RPEL SOP-16 pin (JEDEC) PRSP0016DG-A
RP
(FP-16DNV)
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,500 pcs/reel)
Rev.3.00, Jul.15.2005, page 1 of 8


Renesas Electronics Components Datasheet

HD74LS221P Datasheet

Dual Monostable Multivibrators

No Preview Available !

HD74LS221
Pin Arrangement
1A 1
1B 2
1CLR 3
1Q 4
2Q 5
2 Cext 6
2 Rext/Cext 7
GND 8
CLR
Q
Q
Q
Q
CLR
(Top view)
Function Table
Inputs
Clear
A
B
L
X
X
X
H
X
X
X
L
H
L
H
H
L
H
Notes: H; high level, L; low level, X; irrelevant.
; Transition from high to low level.
; Transition from low to high level.
; one high-level pulse.
; one low-level pulse.
Block Diagram (1/2)
A
16 VCC
15 1 Rext/Cext
14 1 Cext
13 1Q
12 2Q
11 2CLR
10 2B
9 2A
Outputs
Q
Q
L
H
L
H
L
H
Q
Q
B
Clear
Q
Q
Clear
Rev.3.00, Jul.15.2005, page 2 of 8


Part Number HD74LS221P
Description Dual Monostable Multivibrators
Maker Renesas
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HD74LS221P Datasheet PDF






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