74HC5555N datasheet(4/23 Pages) NXP

номер детали	74HC5555N

подробное описание детали	Programmable delay timer with oscillator

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4 / 23 page

September 1993

4

Philips Semiconductors

Product speciﬁcation

Programmable delay timer with oscillator

74HC/HCT5555

Fig.3 Functional diagram.

handbook, full pagewidth

MGA644

R TC

C TC

MONOSTABLE

CIRCUITRY

Q

RS

OSC

CON

MR

A

B

1

14

15

4

5

6

9

7

2

3

10

11

12

13

POWER-ON

RESET

RTR/RTR

OUTPUT

STAGE

Q

24 - STAGE COUNTER

CP

CD

012

S

SSS3

FUNCTIONAL DESCRIPTION

The oscillator configuration allows the

design of RC or crystal oscillator

circuits. The device can operate from

an external clock signal applied to the

RS input (RTC and CTC must not be

connected). The oscillator frequency

is determined by the external timing

components (RT and CT), within the

frequency range 1 Hz to 4 MHz

(32 kHz to 20 MHz with crystal

oscillator).

In the HCT version the MR input is

TTL compatible but the RS input has

CMOS input switching levels. The RS

input can be driven by TTL input

levels if RS is tied to VCC via a pull-up

resistor.

The counter divides the frequency to

obtain a long pulse duration. The

24-stage is digitally programmed via

the select inputs (S0 to S3). Pin S3 can

also be used to select the test mode,

which is a convenient way of

functionally testing the counter.

The “5555” is triggered on either the

positive-edge, negative-edge or both.

• Trigger pulse applied to input A for

positive-edge triggering

• Trigger pulse applied input B for

negative-edge triggering

• Trigger pulse applied to inputs A

and B (tied together) for both

positive-edge and negative

triggering.

The Schmitt trigger action in the

trigger inputs, transforms slowly

changing input signals into sharply

defined jitter-free output signals and

provides the circuit with excellent

noise immunity.

The OSC CON input is used to select

the oscillator mode, either

continuously running (OSC CON =

HIGH) or triggered start mode (OSC

CON = LOW). The continuously

running mode is selected where a

start-up delay is an undesirable

feature and the triggered start mode

is selected where very low power

consumption is the primary concern.

The start of the programmed time

delay occurs when output Q goes

HIGH (in the triggered start mode, the

previously disabled oscillator will

start-up). After the programmed time

delay, the flip-flop stages are reset

and the output returns to its original

state.

An internal power-on reset is used to

reset all flip-flop stages.

The output pulse can be terminated

by the asynchronous overriding

master reset (MR), this results in all

flip-flop stages being reset. The

output signal is capable of driving a

power transistor. The output time

delay is calculated using the following

formula (minimum time delay is

100 ns):

Once triggered, the output width may

be extended by retriggering the

gated, active HIGH-going input A or

the active LOW-going input B. By

repeating this process, the output

pulse period (Q = HIGH, Q = LOW)

can be made as long as desired. This

mode is selected by RTR/RTR =

HIGH. A LOW on RTR/RTR makes,

once triggered, the outputs (Q, Q)

independent of further transitions of

inputs A and B.

1

f

i

---

division ratio (s).

×

Аналогичный номер детали - 74HC5555N

производитель	номер детали	датащи	подробное описание детали
NXP Semiconductors	74HC5555N	142Kb / 23P	Programmable delay timer with oscillator September 1993
Nexperia B.V. All right...	74HC5555N	113Kb / 23P	Programmable delay timer with oscillator September 1993

More results

Аналогичное описание - 74HC5555N

производитель	номер детали	датащи	подробное описание детали
NXP Semiconductors	74HC5555	142Kb / 23P	Programmable delay timer with oscillator September 1993
Nexperia B.V. All right...	74HC5555	314Kb / 28P	Programmable delay timer with oscillator Rev. 4 - 5 July 2018
Nexperia B.V. All right...	74HCT5555	113Kb / 23P	Programmable delay timer with oscillator September 1993
LSI Computer Systems	LS7213R	65Kb / 5P	PROGRAMMABLE DIGITAL DELAY TIMER
	LS7213	43Kb / 4P	PROGRAMMABLE DIGITAL DELAY TIMER
	LS7211N	216Kb / 8P	PROGRAMMABLE DIGITAL DELAY TIMER
	LS7215	221Kb / 8P	PROGRAMMABLE DIGITAL DELAY TIMER
	LS7211	275Kb / 8P	PROGRAMMABLE DIGITAL DELAY TIMER
	LS7210	49Kb / 4P	PROGRAMMABLE DIGITAL DELAY TIMER
	LS7211	171Kb / 8P	PROGRAMMABLE DIGITAL DELAY TIMER

More results

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Аналогичный номер детали - 74HC5555N

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