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6811 Datasheet(PDF) 5 Page - Allegro MicroSystems |
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6811 Datasheet(HTML) 5 Page - Allegro MicroSystems |
5 / 8 page 6811 12-BIT SERIAL-INPUT, LATCHED SOURCE DRIVER www.allegromicro.com TIMING REQUIREMENTS and SPECIFICATIONS (Logic Levels are VDD and Ground) Serial Data present at the input is transferred to the shift register on the logic “0” to logic “1” transition of the CLOCK input pulse. On succeeding CLOCK pulses, the registers shift data information towards the SERIAL DATA OUTPUT. The SERIAL DATA must appear at the input prior to the rising edge of the CLOCK input waveform. Information present at any register is transferred to the respective latch when the STROBE is high (serial-to-parallel conversion). The latches will continue to accept new data as long as the STROBE is held high. Applications where the latches are bypassed (STROBE tied high) will require that the BLANKING input be high during serial data entry. When the BLANKING input is high, the output source drivers are disabled (OFF); the pnp active pull-down sink drivers are ON. The information stored in the latches is not affected by the BLANKING input. With the BLANKING input low, the outputs are controlled by the state of their respective latches. CLOCK SERIAL DATA IN STROBE BLANKING OUTN Dwg. WP-029 50% SERIAL DATA OUT DATA DATA 10% 90% 50% 50% 50% C A B D E LOW = ALL OUTPUTS ENABLED p(STH-QL) t p(CH-SQX) t DATA p(STH-QH) t BLANKING OUTN Dwg. WP-030 DATA 10% 50% en(BQ) t dis(BQ) t HIGH = ALL OUTPUTS BLANKED (DISABLED) 90% r t f t A. Data Active Time Before Clock Pulse (Data Set-Up Time), tsu(D) ......................................... 25 ns B. Data Active Time After Clock Pulse (Data Hold Time), th(D) ............................................... 25 ns C. Clock Pulse Width, tw(CH) ............................................... 50 ns D. Time Between Clock Activation and Strobe, tsu(C) ....... 100 ns E. Strobe Pulse Width, tw(STH) ............................................. 50 ns NOTE – Timing is representative of a 10 MHz clock. Signifi- cantly higher speeds are attainable. |
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