ls7211 LSI Computer Systems, Inc., ls7211 Datasheet
ls7211
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ls7211 Summary of contents
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... Direct relay drive • +4V to +18V operation ( • LS7211, LS7212 (DIP); LS7211-S, LS7212-S (SOIC) - See Figure 1 DESCRIPTION: The LS7211 and LS7212 are CMOS integrated circuits for generating digitally programmable delays. The controlled by 8 binary weighted inputs, WB0 - WB7, in con- junction with an applied clock or oscillator frequency ...
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... Schmitt trigger to provide input hysterisis. LS7211 TIME BASE Input (RC/CLOCK, Pin 4) For LS7211, the basic timing signal is applied at the RC/ CLOCK input. The clock can be provided from either an ex- ternal source or generated by an internal oscillator by con- necting an R-C network to this input. ...
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ABSOLUTE MAXIMUM RATINGS: (All voltages referenced Supply Voltage Voltage (Any Pin) Operating Temperature Storage Temperature ELECTRICAL CHARACTERISTICS (Voltages referenced to Vss) Characteristic SYMBOL Supply Voltage V DD Supply Current I DD Input Voltages: Trigger Low V Trigger ...
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... MODE REG EDGE DETECT LATCH 500K CLOCK MUX OSC +V 1M 3-STATE DECODER 1M FIGURE 2. LS7211/LS7212 BLOCK DIAGRAM Unit Condition Max Min Max 1.0 - 0.76 MHz 3.0 - 2.3 MHz - 4.5 - 3.4 MHz 1.8 - 1.3 MHz For prescale 5.5 - 4.0 MHz factor 3000 8.5 - 6.5 MHz or 3600 0.93 - ...
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Clock t 1 TRIG Delayed Operate A WB0-WB7 OUT Note 1. TRIG input is clocked in by the negative edge of external clock. Note 2. Inputs A, B ...
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10K ƒ µ ƒ ...
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TRIGGER IN 25pF ƒ 25pF 470K + OUTPUT NOTE : Crystal Frequency, ƒ = 32,768Hz FIGURE 9. PROGRAMMABLE ACCURATE REAL-TIME DELAY GENERATION 7211-012703 TRIG 4 XTLI 10M 5 XTLO 6 PSCLS LS7212 7 ...
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CASE 1. MODE = DO or DR; PRESCALE FACTOR this setup a frequency division of the input clock, ƒ factor 257, in increments of 1 can be obtained ...