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MAX6817EUT-T Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX6817EUT-T Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page Detailed Description Theory of Operation The MAX6816/MAX6817/MAX6818 are designed to eliminate the extraneous level changes that result from interfacing with mechanical switches (switch bounce). Virtually all mechanical switches bounce upon opening or closing. These switch debouncers remove bounce when a switch opens or closes by requiring that sequentially clocked inputs remain in the same state for a number of sampling periods. The output does not change until the input is stable for a duration of 40ms. The circuit block diagram (Figure 1) shows the func- tional blocks consisting of an on-chip oscillator, counter, exclusive-NOR gate, and D flip-flop. When the input does not equal the output, the XNOR gate issues a count- er reset. When the switch input state is stable for the full qualification period, the counter clocks the flip-flop, updating the output. Figure 2 shows the typical opening and closing switch debounce operation. On the MAX6818, the change output (CH) is updated simultaneously with the switch outputs. Undervoltage Lockout The undervoltage lockout circuitry ensures that the out-puts are at the correct state on power-up. While the supply voltage is below the undervoltage threshold (typically 1.9V), the debounce circuitry remains transparent. Switch states are present at the logic outputs with no debouce delay. Figure 1. Block Diagram PIN NAME FUNCTION MAX6816 MAX6817 MAX6818 1 2 10 GND Ground 2 — — IN Switch Input — 1, 3 — IN1, IN2 Switch Inputs — — 2–9 IN1–IN8 Switch Inputs 3 — — OUT CMOS Debounced Output — 4, 6 — OUT2, OUT1 CMOS Debounced Outputs — — 12–19 OUT8–OUT1 CMOS Debounced Outputs 4 5 20 VCC +2.7V to +5.5V Supply Voltage — — 1 EN Active-Low, Three-State Enable Input for outputs. Resets CH. Tie to GND to “always enable” outputs. — — 11 CH Change-of-State Output. Goes low on switch input change of state. Resets on EN. Leave unconnected if not used. VCC VCC VCC RPU D Q R Q D COUNTER LOAD OUT IN ESD PROTECTION UNDER- VOLTAGE LOCKOUT OSC. MAX6816 MAX6817 MAX6818 www.maximintegrated.com Maxim Integrated │ 4 MAX6816/MAX6817/ MAX6818 ±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers Pin Description |
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