CD4538BC Datasheet | National Semiconductor

Description The CD4538B 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 ponents 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 Y Y Y Y Y Wide supply voltage range 3 0V to 15V High noise immunity 0 45 VCC (typ ) Low power Fan out of 2 driving 74L TTL patibility or 1 driving 74LS New formula PWOUT e RC (PW in seconds R in Ohms C in Farads) g 1 0% pulse-width variation from part to part (typ ) Wide pulse-width range 1 ms to % Separate latched reset inputs Symmetrical output sink and source capability Low standby current 5 n A (typ ) 5 VDC Pin patible to CD4528B Block and Connection Diagrams Dual-In-Line Package CD4538BM CD4538BC TL F 6000 - 2 Top View Order Number CD4538B TL F 6000 - 1 RX and CX are External ponents VDD e Pin 16 VSS e Pin 8 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 H L u v X e e e e e e e High Level Low Level Transition from Low to High Transition from High to Low One High Level Pulse One Low Level Pulse Irrelevant v H u C1995 National Semiconductor Corporation TL F 6000 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Notes 1 and 2) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications b 0 5 to a 18 VDC DC Supply Voltage (VDD) b 0 5V to...