HD-4702 Ver la hoja de datos (PDF) - Renesas Electronics

Número de pieza

componentes Descripción

Fabricante

HD-4702

CMOS Programmable Bit Rate Generator

Renesas Electronics 

HD-4702

Pin Description

PIN NUMBER

TYPE

16

8

5

I

4

I

7

I

6

O

15

I

11, 12, 13, 14

I

9

O

1, 2, 3

O

10

O

SYMBOL

DESCRIPTION

VCC

VCC: Is the +5V power supply pin. A 0.1F capacitor between pins 16 and 8 is

recommended for decoupling.

GND

GROUND

CP

EXTERNAL CLOCK INPUT

ECP

EXTERNAL CLOCK ENABLE: A low signal on this input allows the baud rate to be

generated from the CP input.

IX

OX

IM

S0 - S3

CRYSTAL INPUT

CRYSTAL DRIVE OUTPUT

MULTIPLEXED INPUT

BAUD RATE SELECT INPUTS

CO

CLOCK OUTPUT

Q0 - Q2

Z

SCAN COUNTER OUTPUTS

BIT RATE OUTPUT

CLOCK MODES AND INITIALIZATION

IX

ECP

CP

OPERATION

H

L

Clocked from IX

X

L

Clocked from CP

X

H

H

Continuous Reset

X

L

Reset During 1st CP = High

Time

H = HIGH Level

L = LOW Level

X = Don’t Care

= Clock Pulse

= 1st HIGH Level Clock Pulse after ECP goes LOW

NOTE: Actual output frequency is 16 times the indicated Output

Rate, assuming a clock frequency of 2.4576MHz.

FN2954 Rev 2.00

August 24, 2006

Page 2 of 8

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