UPD4702 Datasheet, PDF (1/16 Pages) NEC – INCREMENTAL ENCODER 8-BIT UP/DOWN COUNTER CMOS INTEGRATED CIRCUITS

DATA SHEET
MOS INTEGRATED CIRCUIT
µPD4702
INCREMENTAL ENCODER 8-BIT UP/DOWN COUNTER
CMOS INTEGRATED CIRCUITS
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.
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
µPD4702C
µPD4702G
Package
20-pin plastic DIP
20-pin plastic SOP
(300 mil)
(300 mil)
PIN CONFIGURATION (Top View)
Reset
1
A
2
B
3
NC
4
CD0
5
CD1
6
CD2
7
CD3
8
NC
9
VSS
10
20
VDD
19
Carry
18
Borrow
17
STB
16
OE
15
CD7
14
CD6
13
CD5
12
CD4
11
NC
PIN NAMES
A

 _{2-phase incremental signal inputs}
B

Reset : Counter reset input
STB : Latch strobe signal input
OE
: Output control signal input
CD0-7 : 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
©
11999934