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BUY HEF4538BP,652 https://www.utsource.net/itm/p/854658.html
Dual precision monostable multivibrator - Description: Dual Retriggerable Precision Monostable Multivibrator ; Logic switching levels: CMOS ; Number of pins: 16 ; Output drive capability: +/- 2.4 mA @ 15 V ; Power dissipation considerations: Low Power or Automotive Applications ; Propagation delay: 60@15V ns; Voltage: 4.5-15.5 V; Package: SOT38-4 DIP16; Container: Bulk Pack, CECC
Description: The HEF4538BP is a dual 4-input NAND gate with Schmitt-trigger inputs. Features: Schmitt-trigger inputs Low power consumption High noise immunity High input impedance High speed Low input current Low output saturation voltage High noise immunity Output current capability of up to 20 mA Applications: Pulse generator Monostable multivibrator Astable multivibrator Frequency divider Logic gates Flip-flops Shift registers Counters (For reference only)