UPD4702 Datasheet | NEC

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 PIN CONFIGURATION (Top View) Reset A B NC CD0 CD1 CD2 CD3 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VDD Carry Borrow STB OE CD7 CD6 CD5 CD4 NC ORDERING INFORMATION Part Number Package 20-pin plastic DIP 20-pin plastic SOP (300 mil) (300 mil) NC VSS µPD4702C µPD4702G PIN NAMES A B Reset STB OE CD0-7 Carry   2-phase incremental signal inputs  : Counter reset input : Latch strobe signal input : Output control signal input : Count data outputs : 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 © 1993 1994 µPD4702 BLOCK DIAGRAM Reset A Phase Discrimination Edge Detection B 8-Bit Up/Down...