HD74LS221FP

更新时间： 2024-09-23 13:08:19

品牌	Logo	应用领域
瑞萨 - RENESAS		触发器
页数	文件大小	规格书
9页	104K
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HD74LS221FP 数据手册

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 V_CCnoise 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 V_CCand 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 V_CCrange for more than six decades of timing capacitance (10 pF

to 10 µF) and more than one decade of timing resistance (2 kΩ to 100 kΩ).

Throughout these ranges, pulse width is defined by the relationship: t_{w (out)}= Cext • Rext • 1n 2.

Features

•

Ordering Information

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

Part Name

Package Type

DILP-16 pin

PRDP0016AE-B

(DP-16FV)

HD74LS221P

HD74LS221RPEL

—

PRSP0016DG-A

(FP-16DNV)

SOP-16 pin (JEDEC)

EL (2,500 pcs/reel)

Note: Please consult the sales office for the above package availability.

Rev.3.00, Jul.15.2005, page 1 of 8

12 3 4 5 6 7...9

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