M74HC4538TTR 查看數據表（PDF） - STMicroelectronics

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M74HC4538TTR

Dual retriggerable monostable multivibrator

STMicroelectronics 

M74HC4538

Dual retriggerable monostable multivibrator

Features

■ High speed:

tPD = 25 ns (typ.) at VCC = 6 V

■ Low power dissipation

standby state:

ICC = 4 μA (max.) at TA = 25 °C

active state:

ICC = 200 μA (max.) at VCC = 6 V

■ High noise immunity:

VNIH = VNIL = 28 % VCC (min.)

■ Symmetrical output impedance:

|IOH| = IOL = 4 mA (min.)

■ Balanced propagation delays:

tPLH ≅ tPHL

■ Wide operating voltage range:

VCC (opr) = 2 to 6 V

■ Wide output pulse width range:

tWOUT = 120 ns ~ 60 s over at VCC = 4.5 V

■ Pin and function compatible with

74 series 4538

DIP-16

SO-16

TSSOP16

Description

The M74HC4538 is a high speed CMOS monostable

multivibrator fabricated with silicon gate C2MOS

technology.

Each multivibrator features both a negative A, and a

positive B, edge 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

monostable multivibrators are retriggerable. That is,

they may be triggered repeatedly while their outputs are

generating a pulse and the pulse will be extended.

Pulse width stability over a wide range of temperature

and supply is achieved using linear CMOS techniques.

The output pulse equation is simply: PW = 0.7 (R)(C)

where PW is in seconds, R in Omhs and C is in Farads.

All the inputs are equipped with protection circuits

against static discharge and transient excess voltage.

Table 1.

Device summary

Order code

M74HC4538B1R

M74HC4538RM13TR

M74HC4538TTR

Package

DIP-16

SO-16

TSSOP16

Packaging

Tube

Tape and reel

Tape and reel

May 2008

Rev 2

1/18

www.st.com

18

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