Texas Instruments CD74HCT4538M96 Handleiding

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Data sheet acquired from Harris Semiconductor

SCHS123E

Features

• Retriggerable/Resettable Capability

• Trigger and Reset Propagation Delays Independent of

RX, CX

• Triggering from the Leading or Trailing Edge

• Q and Q Buered Outputs Available

• Separate Resets

• Wide Range of Output Pulse Widths

• Schmitt Trigger Input on A and B Inputs

• Retrigger Time is Independent of CX

• Fanout (Over Temperature Range)

- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55oC to 125oC

• Balanced Propagation Delay and Transition Times

• Signiﬁcant Power Reduction Compared to LSTTL

Logic ICs

• HC Types

- 2V to 6V Operation

- High Noise Immunity: NIL = 30%, NIH = 30% of VCC

at VCC = 5V

• HCT Types

- 4.5V to 5.5V Operation

- Direct LSTTL Input Logic Compatibility,

VIL= 0.8V (Max), VIH = 2V (Min)

- CMOS Input Compatibility, Il ≤µ1 A at VOL, VOH

Pinout

CD54HC4538, CD54HCT4538

(CERDIP)

CD74HC4538

(PDIP, SOIC, SOP, TSSOP)

CD74HCT4538

(PDIP, SOIC)

TOP VIEW

Description

The ’HC4538 and ’HCT4538 are dual

retriggerable/resettable monostable precision multivibrators

for ﬁxed voltage timing applications. An external resistor

(RX ) and an external capacitor (CX ) control the timing and

the accuracy for the circuit. Adjustment of RX and CX

provides a wide range of output pulse widths from the Q and

Q terminals. The propagation delay from trigger input-to-

output transition and the propagation delay from reset input-

to-output transition are independent of R

X and CX.

Leading-edge triggering (A) and trailing edge triggering (B)

inputs are provided for triggering from either edge of the

input pulse. An unused “A” input should be tied to GND and

an unused B should be tied to VCC . On power up the IC is

reset. Unused resets and sections must be terminated. In

normal operation the circuit retriggers on the application of

each new trigger pulse. To operate in the non-triggerable

mode Q is connected to B when leading edge triggering (A)

is used or Q is connected to A when trailing edge triggering

( B) is used. The period ( ) can be calculated from = (0.7)τ τ

RX, CX; RMIN is 5k . CΩMIN is 0pF.

GND

Ordering Information

PART NUMBER

TEMP. RANGE

(o C) PACKAGE

CD54HC4538F3A -55 to 125 16 Ld CERDIP

CD54HCT4538F3A -55 to 125 16 Ld CERDIP

CD74HC4538E -55 to 125 16 Ld PDIP

CD74HC4538M -55 to 125 16 Ld SOIC

CD74HC4538MT -55 to 125 16 Ld SOIC

CD74HC4538M96 -55 to 125 16 Ld SOIC

CD74HC4538NSR -55 to 125 16 Ld SOP

CD74HC4538PW -55 to 125 16 Ld TSSOP

CD74HC4538PWR -55 to 125 16 Ld TSSOP

CD74HC4538PWT -55 to 125 16 Ld TSSOP

CD74HCT4538E -55 to 125 16 Ld PDIP

CD74HCT4538M -55 to 125 16 Ld SOIC

CD74HCT4538MT -55 to 125 16 Ld SOIC

CD74HCT4538M96 -55 to 125 16 Ld SOIC

NOTE: When ordering, use the entire part number. The sufﬁxes 96

and R denote tape and reel. The sufﬁx T denotes a small-quantity

reel of 250.

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

CD54HC4538, CD74HC4538,

CD54HCT4538, CD74HCT4538

High-Speed CMOS Logic Dual Retriggerable

Precision Monostable Multivibrator

[ /Title

(CD54

HC453

CD74

HC453

CD74

HCT45

38)

/Sub-

ject

(High

Speed

CMOS

Logic

June 1998 - Revised October 2003

Functional Diagram

MONO 2

VCC

15 14

2Cx 2RxCx

MONO 1

VCC

1 2

1Cx 1RxCx

1Cx 1Rx

2Cx 2Rx

GND = 8

VCC = 16

TRUTH TABLE

INPUTS OUTPUTS

R A B Q Q

L X X L H

X H X L H

X X L L H

H L ↓

H H↑

H = High Level, L = Low Level, = Transition from Low to High,↑

↓ = Transition from High to Low, One High Level Pulse,

One Low Level Pulse, X = Irrelevant. FIGURE 1. FF DETAIL

CD54HC4538, CD74HC4538, CD54HCT4538, CD74HCT4538

FIGURE 2. LOGIC DIAGRAM (1 MONO)

FUNCTIONAL TERMINAL CONNECTIONS

FUNCTION

VCC TO

TERMINAL NUMBER

GND TO

TERMINAL NUMBER

INPUT PULSE TO

TERMINAL NUMBER

OTHER

CONNECTIONS

MONO1MONO2MONO 1MONO2MONO 1MONO2MONO1MONO2

Leading-Edge

Trigger/Retriggerable

3, 5 11, 13 4 12

Leading-Edge

Trigger/Non-Retriggerable

3 13 4 12 5-7 11-9

Trailing-Edge

Trigger/Retriggerable

313412511

Trailing-Edge

Trigger/Non-Retriggerable

3 13 5 11 4-6 12-10

NOTES:

1. A retriggerable one-shot multivibrator has an output pulse width which is extended one full time period (T) after application of the last

trigger pulse.

2. A non-triggerable one-shot multivibrator has a time period (T) referenced from the application of the rst trigger pulse.

FIGURE 3. INPUT PULSE TRAIN FIGURE 4. RETRIGGERABLE MODE

PULSE WIDTH (A MODE)

FIGURE 5. NON-RETRIGGERABLE MODE

PULSE WIDTH

(A MODE)

CL CL Q

R2R1

VCC

2(14)

1(15)

3(13)

4(12)

5(11)

VCC

HIGH Z

VCC

COMP II

+6(10)

7(9)

VCC

CD54HC4538, CD74HC4538, CD54HCT4538, CD74HCT4538

Product specificaties

Merk:	Texas Instruments
Categorie:	Niet gecategoriseerd
Model:	CD74HCT4538M96
Breedte:	10 mm
Diepte:	4 mm
Hoogte:	1.5 mm
Breedte verpakking:	336.1 mm
Diepte verpakking:	340.5 mm
Hoogte verpakking:	32 mm
Soort:	Logic IC
Type verpakking:	SOIC
Aantal per verpakking:	2500 stuk(s)
Temperatuur bij opslag:	-65 - 150 °C
Bedrijfstemperatuur (T-T):	-55 - 125 °C
Aantal pinnen:	16
Breedte (met pennen):	10 mm
Diepte (met pennen):	6.2 mm
Hoogte (met pennen):	1.75 mm