74VHC221ASJ(2007) データシートの表示（PDF） - Fairchild Semiconductor

部品番号

コンポーネント説明

メーカー

74VHC221ASJ
(Rev.:2007)

Dual Non-Retriggerable Monostable Multivibrator

Fairchild Semiconductor 

74VHC221A

Dual Non-Retriggerable Monostable Multivibrator

May 2007

tm

Features

■ High Speed: tPD = 8.1ns (Typ.) at VCC = 5V

■ Low Power Dissipation: ICC = 4µA (Max.) at TA = 25°C

■ Active State: ICC = 600µA (Max.) at TA = 25°C

■ High Noise Immunity: VNIH = VNIL = 28% VCC (Min.)

■ Power down protection is provided on all inputs

■ Pin and function compatible with 74HC221A

General Description

The VHC221A is an advanced high speed CMOS

Monostable Multivibrator fabricated with silicon gate

CMOS technology. It achieves the high speed operation

similar to equivalent Bipolar Schottky TTL while main-

taining the CMOS low power dissipation. Each multi-

vibrator features both a negative, A, and a positive, B,

transition triggered input, either of which can be used as

an inhibit input. Also included is a clear input that when

taken LOW resets the one-shot. The VHC221A can be

triggered on the positive transition of the clear while A is

held LOW and B is held HIGH. The VHC221A is non-

retriggerable, and therefore cannot be retriggered until

the output pulse times out. The output pulse width is

determined by the equation:

PW = (Rx)(Cx)

where,

PW is in seconds, R is in ohms, and C is in farads.

Limits for Rx and Cx are:

External capacitor, Cx: No limit

External resistors, Rx: VCC = 2.0V, 5kΩ Min.

VCC > 3.0V, 1 kΩ Min

An input protection circuit ensures that 0 to 7V can be

applied to the input pins without regard to the supply

voltage. This device can be used to interface 5V to 3V

systems and two supply systems such as battery back

up. This circuit prevents device destruction due to mis-

matched supply and input voltages.

Ordering Information

Package

Order Number Number

Package Description

74VHC221AM

74VHC221ASJ

74VHC221AMTC

M16A

M16D

MTC16

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm

Wide

Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the

ordering code.

©1994 Fairchild Semiconductor Corporation

74VHC221A Rev. 1.2

www.fairchildsemi.com

Share Link: