UPD4702C NEC [NEC], UPD4702C Datasheet
UPD4702C
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UPD4702C Summary of contents
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INCREMENTAL ENCODER 8-BIT UP/DOWN COUNTER DESCRIPTION The 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, or ...
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BLOCK DIAGRAM Reset A Phase Discrimination Edge Detection B PIN FUNCTIONS Pin Name Input/Output A, B Input (Schmitt) D Output (3-state) Carry Output Borrow Output RESET Input (Schmitt) OE Input STB Input V DD GND 2 8-Bit ...
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DESCRIPTION OF OPERATIONS (1) Count operation The 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 0FF Carry output (the pulse width MIN. 120 ns MAX. irrespective of the A/B phase input cycle. Similarly, if the ...
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OPERATING PRECAUTIONS As the 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 00 0FF H power supply line is sufficiently low ...
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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 CHARACTERISTICS (T = – ...
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AC Timings A t SAB B t PWRS Reset t SRSAB A/B t DRSCD CD 0–7 t DOECD OE STB Fig. 3 Carry/Borrow Signal Output Timing A/B (CD) (0FEH) (0FFH) (00) t DABCB Carry Borrow Fig. 1 Two-Phase Signal Input ...
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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 Down ...
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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 ...
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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 ...
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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 PD4702 detail ...
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