upd4704 Renesas Electronics Corporation., upd4704 Datasheet
upd4704
Available stocks
Related parts for upd4704
upd4704 Summary of contents
Page 1
EXTENSION 8-BIT UP/DOWN COUNTER DESCRIPTION The PD4704 is 8-bit up/down counters for extension of the PD4702 incremental encoder counter. They perform an up/down-count using an 8-bit width with a PD4702 carry or borrow signal as input. In addition, a carry ...
Page 2
BLOCK DIAGRAM Reset A Discrimination Edge Detection B PIN FUNCTIONS Pin Name Input/Output Up Input Down D Output (3-state) Carry Output Borrow Output RESET Input (Schmitt) OE Input STB Input V DD GND 2 Phase 8-Bit Up/Down ...
Page 3
TRUTH TABLE 1 (COUNTER BLOCK) UP DOWN RESET TRUTH TABLE 2 (LATCH & OUTPUT BLOCKS) STB OE H Output disable (3-state) L Output ...
Page 4
DESCRIPTION OF OPERATIONS (1) Count operation The PD4704 is designed as 8-bit up/down counter for extension of the PD4702. The first-stage Carry output is connected to the UP input of the PD4704, and similarly, the Borrow output is connected ...
Page 5
Fig. 2 Relation Between STB Timing and Counter Value UP/DOWN STB Pre-count value latched UP/DOWN t RESET STB (3) Carry & borrow outputs If the counter performs an up-count operation when the count value is 0FF Carry output (the pulse ...
Page 6
OPERATING PRECAUTIONS As the PD4704 incorporates an 8-bit counter, a large transient current flows in the case of a count value which changes all the bits (such as 00 0FF H power supply line is sufficiently low ...
Page 7
ABSOLUTE MAXIMUM RATINGS (T A PARAMETER SYMBOL Supply voltage V DD Input voltage V I Output voltage V O Operating temperature T opt Storage temperature T stg Permissible loss CHARACTERISTICS (T = – ...
Page 8
AC Timings t PWUDL UP/DOWN RESET UP/DOWN t DRSCD Hi-Z CD – STB Fig. 3 Carry/Borrow Signal Output Timing UP/DOWN Carry Borrow UP/DOWN STB 8 Fig. 1 Up/Down Signal Input Timing t CYCT t PWUDH t SUDM ...
Page 9
Consumption Current Measurement Circuit STB Test Input Waveform 2.6 V (RESET input 2.2 V (inputs other than RESET) IH ...
Page 10
Sample Application Circuits 16-bit counter Incremental Rotary Encoder RESET The application circuits and their parameters are for references only and are not intended for use in actual design-in' Carry UP B Borrow ...
Page 11
RECOMMENDED SOLDERING CONDITIONS The following conditions (see table below) must be met when soldering this product. Please consult with our sales offices in case other soldering process is used case soldering is done under different conditions. TYPES OF ...
Page 12
PLASTIC DIP (300 mil NOTES 1) Each lead centerline is located within 0.25 mm (0.01 inch) of its true position (T.P.) at maximum material condition. 2) ltem "K" to center of ...
Page 13
PIN PLASTIC SOP (300 mil NOTE Each lead centerline is located within 0.12 mm (0.005 inch) of its true position (T.P.) at maximum material condition PD4704 detail of ...
Page 14
PD4704 ...
Page 15
PD4704 15 ...
Page 16
No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Corporation. NEC Corporation assumes no responsibility for any errors which may appear in this document. ...