CD4538BC

CD4538BC Dual Precision Monostable

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CD4538BC Dual Precision Monostable

October 1987 Revised April 2002

CD4538BC Dual Precision Monostable
General Description
The CD4538BC is a dual, precision monostable multivibrator with independent trigger and reset controls. The device is retriggerable and resettable, and the control inputs are internally latched. Two trigger inputs are provided to allow either rising or falling edge triggering. The reset inputs are active LOW and prevent triggering while active. Precise control of output pulse-width has been achieved using linear CMOS techniques. The pulse duration and accuracy are determined by external components RX and CX. The device does not allow the timing capacitor to discharge through the timing pin on power-down condition. For this reason, no external protection resistor is required in series with the timing pin. Input protection from static discharge is provided on all pins.

Features
s Wide supply voltage range: 3.0V to 15V s High noise immunity: 0.45 VCC (typ.) s Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS s New formula: PWOUT RC (PW in seconds, R in Ohms, C in Farads) s 1.0% pulse-width variation from part to part (typ.) s Wide pulse-width range: 1 s to s Separate latched reset inputs s Symmetrical output sink and source capability s Low standby current: 5 nA (typ.) 5 VDC s Pin compatible to CD4528BC

Ordering Code:
Order Number CD4538BCM CD4538BCWM CD4538BCN Package Number M16A M16B N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 16-Lead Small Outline Intergrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.

Connection Diagram

Truth Table
Inputs Clear L X X H H A X H X L B X X L Outputs Q L L L Q H H H

Top View

H HIGH Level L LOW Level Transition from LOW-to-HIGH Transition from HIGH-to-LOW One HIGH Level Pulse One LOW Level Pulse X Irrelevant

2002 Fairchild Semiconductor Corporation

DS006000

www.fairchildsemi.com