UPD4702

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


Pinout




Specifications

PARAMETER	SYMBOL	RATING		UNIT
Supply voltage	VDD	0.5 to +7.0		V
Input voltage	VI	1.0 to VDD +1.0		V
Output voltage	VO	0.5 to VDD +0.5		V
Operating temperature	Topt	40 to +85		°C
Storage temperature	Tstg	65 to +150		°C
Permissible loss	PD	500 (DIP)	200 (SOP)	mW

Description

The µPD4702 is 8-bit up/down counters for an incremental encoder. Two-phase (A, B) incremental input signalsarephase-differentiated, and on each signal edge, an up-count is executed if the A phase is leading, or a down-countifthe B phase is leading. Eight-bit count data is output in real time. A carry output and borrow output arealsoprovided for counter overflow and underflow.

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