CD54HC4538 Datasheet, PDF(8/11 Page) Texas Instruments – High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator

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CD54HC4538 Datasheet, PDF (8/11 Pages) Texas Instruments – High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator

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CD54HC4538, CD74HC4538, CD74HCT4538

Switching Speciï¬cations CL = 50pF, Input tr, tf = 6ns, RX = 10Kâ¦, CX = 0 (Continued)

PARAMETER

TEST

SYMBOL CONDITIONS VCC (V) MIN

25oC

TYP MAX

-40oC TO

85oC

MIN MAX

-55oC TO

125oC

MIN MAX UNITS

R to Q

tPLH

CL = 50pF

4.5

CL = 15pF

Output Transition Time

Output Pulse Width

RX = 10k, CX = 0.1ÂµF

tTLH, tTHL

CL = 50pF

4.5

0.63 - 0.77 0.602 0.798 0.595 0.805 ms

Output Pulse Width Match,

Same Package

Power Dissipation Capacitance CPD

CL = 15pF

Â±1

- 134 -

Input Capacitance

CL = 50pF

NOTES:

10. CPD is used to determine the dynamic power consumption, per one shot.

11. PD = (CPD + CX) VCC2 fi â(CL VCC2 fO) where fi = input frequency, fO = output frequency, CL = output load capacitance,

CX = external capacitance VCC = supply voltage assuming fi Â« Ï-I-

Test Circuits and Waveforms

tr = 6ns

INPUT

90%

50%

10%

tf = 6ns

VCC

GND

tTHL

INVERTING

OUTPUT

tPHL

tTLH

90%

50%

10%

tPLH

FIGURE 6. HC AND HCU TRANSITION TIMES AND PROPAGA-

TION DELAY TIMES, COMBINATION LOGIC

tr = 6ns

INPUT

tTHL

2.7V

1.3V

0.3V

INVERTING

OUTPUT

tPHL

tf = 6ns

GND

tTLH

90%

1.3V

10%

tPLH

FIGURE 7. HCT TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

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