upd4702 Renesas Electronics Corporation., upd4702 Datasheet
upd4702
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upd4702 Summary of contents
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INCREMENTAL ENCODER 8-BIT UP/DOWN COUNTER DESCRIPTION The µ PD4702 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, ...
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BLOCK DIAGRAM Reset A Phase Discrimination Edge Detection B PIN FUNCTIONS Pin Name Input/Output A, B Input (Schmitt Output 0 7 (3-state) Carry Output Borrow Output RESET Input (Schmitt) OE Input STB Input V – DD GND ...
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DESCRIPTION OF OPERATIONS (1) Count operation The µ PD4702 incorporates a phase discrimination circuit, and counts by 4-multiplication of the A and B input 2-phase pulses. Therefore, a count operation is performed input edge and a ...
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Carry & borrow outputs If the counter performs an up-count operation when the count value is 0FFH, an active-low pulse is output to the Carry output (the pulse width MIN. 120 ns MAX. irrespective of the ...
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OPERATING PRECAUTIONS As the µ PD4702 incorporates an 8-bit counter, a large transient current flows in the case of a count value which changes all the bits (such as 00H ↔ 0FFH or 7FH ↔ 080H). This will cause ...
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ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS (T PARAMETER SYMBOL Supply voltage V DD Input voltage V I Output voltage V O Operating temperature T opt Storage temperature T stg Permissible loss –40 to +85 ° ...
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AC Timings Figure 3–1. Two-Phase Signal Input Timing A t SAB B t PWRS Reset t SRSAB A/B t DRSCD CD 0–7 t DOECD OE STB Figure 3–3. Carry/Borrow Signal Output Timing A/B (0FEH) (0FFH) (CD) t DABCB Carry Borrow ...
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Consumption Current Measurement Circuit STB Test Input Waveform Measurement Conditions A, B inputs f = 3.6 MHz IN 2 0.8 ...
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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 Borrow B ...
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PACKAGE DRAWINGS 20-PIN PLASTIC DIP (7.62mm(300 NOTES 1. Each lead centerline is located within 0. its true position (T.P.) at maximum material condition. 2. ltem "K" to center of leads ...
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PLASTIC SOP (7.62 mm (300 NOTE Each lead centerline is located within 0. its true position (T.P.) at maximum material condition. 11 detail of lead end 10 ...
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RECOMMENDED SOLDERING CONDITIONS The µ PD4702 should be soldered and mounted under the following recommended conditions. For soldering methods and conditions other than those recommended below, contact an NEC Electronics sales representative. For technical information, see the following ...
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REFERENCE DOCUMENTS NEC Semiconductor Device Reliability/Quality Control System (C10983E) Quality Grades on NEC Semiconductor Devices (C11531E) Guide to Quality Assurance for Semiconductor devices (MEI-1202) Semiconductor Selection Guide - Products and Packages - (X13769X) Data Sheet S14940EJ3V0DS µ PD4702 13 ...
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PRECAUTION AGAINST ESD FOR SEMICONDUCTORS Note: Strong electric field, when exposed to a MOS device, can cause destruction of the gate oxide and ultimately degrade the device operation. Steps must be taken to stop generation of static electricity as ...
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The information in this document is current as of January, 2004. The information is subject to change without notice. For actual design-in, refer to the latest publications of NEC Electronics data sheets or data books, etc., for the most ...