74HCT123DB datasheet(9/25 Pages) PHILIPS

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74HC_HCT123

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Product data sheet

Rev. 8 — 16 December 2011

9 of 25

NXP Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

trtrig

retrigger time

nA,nB; CEXT = 0 pF;

REXT = 5 k; VCC = 5.0 V;

see Figure 10

[3][4]

-110

REXT

external timing

resistor

see Figure 7

VCC = 2.0 V

1000



VCC = 5.0 V

1000



CEXT

external timing

capacitor

VCC = 5.0 V; see Figure 7

[4]

CPD

power

dissipation

capacitance

per monostable;

VI = GND to VCC

[5]

-54-

74HCT123

tPHL

HIGH to LOW

propagation

delay

nRD, nA, nB to nQ or nQ;

CEXT = 0 pF; REXT =

; see Figure 9

VCC = 4.5 V

VCC = 5 V; CL =15pF

nRD (reset) to nQ or nQ;

CEXT =0 pF;

REXT =5 k;

see Figure 9

VCC = 4.5 V

VCC = 5 V; CL =15pF

tPLH

LOW to HIGH

propagation

delay

nRD, nA, nB to nQ or nQ;

CEXT = 0 pF;

REXT =5 k;

see Figure 9

VCC = 4.5 V

VCC = 5 V; CL =15pF

nRD (reset) to nQ or nQ;

CEXT =0 pF; REXT =

; see Figure 9

VCC = 4.5 V

VCC = 5 V; CL =15pF

transition time

VCC = 4.5 V; see Figure 9

[1]

Table 7.

Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 12.

Symbol Parameter

Conditions

C

40 C to +85 C 40 C to +125 C Unit

Min

Typ

Max

Min

Max

Min

Max

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