DESCRIPTION

The

µPD4702 is 8-bit up/down counters for an incremental encoder. Two-phase (A, B) incremental input signals

are phase-differentiated, and on each signal edge, an up-count is executed if the A phase is leading, or a down-count

if the B phase is leading. Eight-bit count data is output in real time. A carry output and borrow output are also

provided for counter overflow and underflow.

The

µPD4704 is also available; use of these enables the count width to be extended.

©

1994

DATA SHEET

1993

INCREMENTAL ENCODER 8-BIT UP/DOWN COUNTER

CMOS INTEGRATED CIRCUITS

MOS INTEGRATED CIRCUIT

FEATURES

• Incremental inputs (A, B)

• On-chip phase discrimination circuit (up-count mode

when the phase order is A

→ B, down-count mode

when B

→ A) 4-multiplication count method

• On-chip edge detection circuit

• 8-bit up/down counter latch output o Carry output,

borrow output

• Count data output controllable (3-state output)

• CMOS, single +5 V power supply

ORDERING INFORMATION

Part Number

Package

µPD4702C

20-pin plastic DIP

(300 mil)

µPD4702G

20-pin plastic SOP

(300 mil)

1

2

3

4

5

6

7

8

9

10

Reset

A

B

NC

NC

Carry

Borrow

STB

OE

NC

20

19

18

17

16

15

14

13

12

11

PIN CONFIGURATION (Top View)

PIN NAMES

A

2-phase incremental signal inputs

B

Reset

: Counter reset input

STB

: Latch strobe signal input

OE

: Output control signal input

: Count data outputs

Carry

: Carry pulse output

Borrow : Borrow pulse output







Document No.

IC-3304A (2nd edition)

(O. D. No.

IC-5403A)

Date Published April 1997 P

Printed in Japan