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TC74HC4538AF Dataheets PDF



Part Number TC74HC4538AF
Manufacturers Toshiba Semiconductor
Logo Toshiba Semiconductor
Description Dual Retriggerable Monostable Multivibrator
Datasheet TC74HC4538AF DatasheetTC74HC4538AF Datasheet (PDF)

TC74HC4538AP/AF/AFT TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HC4538AP, TC74HC4538AF, TC74HC4538AFT Dual Retriggerable Monostable Multivibrator The TC74HC4538A is a high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicon gate C2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. There are two trigger inputs, A input (positive edge input), and B input (negative edge input). These inputs a.

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TC74HC4538AP/AF/AFT TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HC4538AP, TC74HC4538AF, TC74HC4538AFT Dual Retriggerable Monostable Multivibrator The TC74HC4538A is a high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicon gate C2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. There are two trigger inputs, A input (positive edge input), and B input (negative edge input). These inputs are valid for a slow rise/fall time signal (tr = tf = 1 s) as they are schmitt trigger inputs. After triggering, the output stays in a MONOSTABLE state for the time period determined by the external resistor and capacitor (RX, CX). A low level at CD input breaks this STABLE STATE. In the MONOSTABLE state, if a new trigger is applied, it makes the MONOSTABLE period longer (retrigger mode). Limitations for CX and RX are as follows: External capacitor CX ........... No limitation External resistor RX .............. VCC = 2.0 V more than 5 kΩ VCC ≥ 3.0 V more than 1 kΩ All inputs are equipped with protection circuits against static discharge or transient excess voltage. Features (Note) • High speed: tpd = 25 ns (typ.) at VCC = 5 V • Low power dissipation Stand by state: ICC = 4 μA (max) at Ta = 25°C Active state: ICC = 300 μA (max) at Ta = 25°C • High noise immunity: VNIH = VNIL = 28% VCC (min) • Output drive capability: 10 LSTTL loads • Symmetrical output impedance: |IOH| = IOL = 4 mA (min) • Balanced propagation delays: tpLH −∼ tpHL • Wide operating voltage range: VCC (opr) = 2 V to 6 V • Pin and function compatible with 4538B Note: In the case of using only one circuit, CD should be tied to GND, T1·T2·Q· Q should be tied to OPEN, the other inputs should be tied to VCC or GND. TC74HC4538AP TC74HC4538AF TC74HC4538AFT Weight DIP16-P-300-2.54A SOP16-P-300.1.27A TSSOP16-P-0044-0.65A : 1.00 g (typ.) : 0.18 g (typ.) : 0.06 g (typ.) Start of commercial production 1987-11 1 2016-12-02 Pin Assignment 1T1 1 1T2 2 1CD 3 1A 4 1B 5 1Q 6 1Q 7 GND 8 (top view) 16 VCC 15 2T1 14 2T2 13 2CD 12 2A 11 2B 10 2Q 9 2Q Truth Table Inputs A B CD H H X L H H X H L H X X L X: Don’t care Outputs Q Q L H L H L H Note Output Enable Inhibit Inhibit Output Enable Reset TC74HC4538AP/AF/AFT IEC Logic Symbol 1A (4) 1B (5) 1CD (3) 1T1 (1) 1T2 (2) 2A (12) 2B (11) 2CD (13) 2T1 (15) 2T2 (14) & R CX RX/CX & R CX RX/CX (6) 1Q (7) 1Q (10) 2Q (9) 2Q 2 2016-12-02 Block Diagram (Note) TC74HC4538AP/AF/AFT A4 B5 DX CX RX 12 VCC T1 T2 6Q 7Q 3 CD A 12 B 11 DX CX RX 15 14 VCC T1 T2 10 Q 13 CD 9Q Note: Note: CX, RX, DX are external capacitor, resistor, and diode, respectively. External clamping diode, DX The external capacitor is charged to VCC level in the wait state, i.e. when no trigger is applied. Supply voltage is turned off and CX is discharged mainly through the internal (parasitic) diode. If CX is sufficiently large and VCC drops rapidly.


TC74HC4538AP TC74HC4538AF TC74HC4538AFT


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