74HC5555D,118 查看數據表（PDF） - NXP Semiconductors.

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74HC5555D,118

Programmable delay timer with oscillator

NXP Semiconductors. 

Philips Semiconductors

Programmable delay timer with oscillator

Product specification

74HC/HCT5555

FEATURES

• Positive and negative edge

triggered

• Retriggerable or non-retriggerable

• Programmable delay

minimum: 100 ns

maximum: depends on input

frequency and division ratio

• Divide-by range of 2 to 224

• Direct reset terminates output

pulse

• Very low power consumption in

triggered start mode

• 3 oscillator operating modes:

– RC oscillator

– Crystal oscillator

– External oscillator

• Device is unaffected by variations

in temperature and VCC when using

an external oscillator

• Automatic power-ON reset

• Schmitt trigger action on both

trigger inputs

• Direct drive for a power transistor

• Low power consumption in active

mode with respect to TTL type

timers

• High precision due to digital timing

• Output capability: 20 mA

• ICC category: MSI.

APPLICATIONS

• Motor control

• Attic fan timers

• Delay circuits

• Automotive applications

• Precision timing

• Domestic appliances.

GENERAL DESCRIPTION

The 74HC/HCT5555 are high-speed

Si-gate CMOS devices and are pin

compatible with low power Schottky

TTL (LSTTL). They are specified in

compliance with JEDEC standard

no. 7A.

The 74HC/HCT5555 are precision

programmable delay timers which

consist of:

• 24-stage binary counter

• integrated oscillator (using external

timing components)

• retriggerable/non-retriggerable

monostable

• automatic power-ON reset

• output control logic

• oscillator control logic

• overriding asynchronous master

reset (MR).

QUICK REFERENCE DATA

GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns.

SYMBOL

PARAMETER

CONDITIONS

tPHL/tPLH

CI

CPD

propagation delay

A, B to Q/Q

MR to Q/Q

RS to Q/Q

input capacitance

power dissipation

capacitance per buffer

CL = 15 pF;

VCC = 5 V

notes 1 and 2

TYP. UNIT

24 24 ns

19 20 ns

26 28 ns

3.5 3.5 pF

23 36 pF

Notes

1. CPD is used to determine the dynamic power dissipation (PD in µW):

PD = CPD x VCC2 x fi + Σ(CL x VCC2 x fo) where:

fi = input frequency in MHz

fo = output frequency in MHz

Σ(CL x VCC2 x fo) = sum of outputs.

CL = output load capacitance in pF

VCC = supply voltage in V

2. For HC the condition is VI = GND to VCC

For HCT the condition is VI = GND to VCC − 1.5 V.

ORDERING INFORMATION

EXTENDED TYPE

NUMBER

74HC/HCT5555N

74HC/HCT5555D

PINS

16

16

PACKAGE

PIN POSITION MATERIAL

DIL

SO16

plastic

plastic

CODE

SOT38Z

SOT109A

September 1993

2

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