MAX6816EUS-T datasheet(4/8 Pages) MAXIM

Part #	MAX6816EUS-T

Description	±15kV ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers

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Manufacturer	MAXIM [Maxim Integrated Products]

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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

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

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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