UPD4702G NEC, UPD4702G Datasheet
UPD4702G
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UPD4702G 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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... 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 therefore recommended that a decoupling capacitor (of around 0 connected between V and V right next to the IC as shown in Fig Also pulse shorter than the phase difference time miscount ...
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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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... AC Test Input Waveform Measurement Conditions A, B inputs f = 3.6 MHz STB input connected input connected to V Load on all outputs 2.6 V (A, B, RESET inputs 2.2 V (inputs other than A, B, RESET 0 Timing measurement is performed at 1.5 V. PD4702 ...
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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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... Wave soldering Solder temperature: 260 C or below, Flow time: 10 seconds or below REFERENCE NEC semiconductor device reliability/quality control system Quality grade on NEC semiconductor devices Semiconductor device mounting technology manual Semiconductor device package manual Guide to quality assurance for semiconductor devices Semiconductor selection guide ...
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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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... Specific: Aircrafts, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems or medical equipment for life support, etc. The quality grade of NEC devices is "Standard" unless otherwise specified in NEC's Data Sheets or Data Books. If customers intend to use NEC devices for applications other than those specified for Standard quality grade, they should contact an NEC sales representative in advance ...