MAX6816 데이터 시트보기 (PDF) - Maxim Integrated

부품명

상세내역

제조사

MAX6816

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

Maxim Integrated 

MAX6816/MAX6817/

MAX6818

±15kV ESD-Protected, Single/Dual/Octal,

CMOS Switch Debouncers

tDP

IN1

OUT1

IN2

OUT2

CH

MAX6818 ONLY

Figure 2. Input Characteristics

20V

IN 0V

(20V/div)

-20V

4V

OUT

(2V/div)

0V

20ms/div

Figure 3. Switch Input ±25V Fault Tolerance

Robust Switch Inputs

The switch inputs on the MAX6816–MAX6818 have

overvoltage-clamping diodes to protect against damaging

fault conditions. Switch input voltage scan safely swing

±25V to ground (Figure 3). Proprietary ESD-protection

structures protect against high ESD encountered in

harsh industrial environments, membrane keypads, and

portable applications. They are designed to withstand

±15kV per the IEC 1000-4-2 Air-Gap Discharge Test and

±8kV per the IEC 1000-4-2 Contact Discharge Test.

Since there are 63kΩ (typical) pullup resistors

connected to each input, driving an input to -25V draws

approximately 0.5mA (up to 4mA for eight inputs) from

the VCC supply. Driving an input to +25V will cause

approximately 0.32mA of current (up to 2.6mA for eight

EN

tEN

1/2 VCC

1/2 VCC

OUT1–OUT8

OUT1–OUT8

CH

tPE

1/2

VCCOUT

NORMALLY

LOW

tPE 1/2 VCC OUT NORMALLY

HIGH

tPC

1/2 VCC

tPD

VOL + 0.5V

VOH - 0.5V

tPD

Figure 4. MAX6818 μP Interface Timing Diagram

+VCC

SW1

IN1

IN8

SW8

0.1µF

MAX6818

EN

CH

OUT1

OUT8

+VCC

I/O

µP

IRQ

D0

D7

Figure 5. MAX6818 Typical μP Interfacing Circuit

inputs) to flow back into the VCC supply. If the total system

VCC supply current is less than the current flowing back

into the VCC supply, VCC will rise above normal levels.

In some low-current systems, a zener diode on VCC may

be required.

±15kV ESD Protection

As with all Maxim devices, ESD-protection structures are

incorporated on all pins to protect against electrostatic dis-

charges encountered during handling and assembly. The

MAX6816–MAX6818 have extra protection against static

electricity. Maxim’s engineers have developed state-of-

the-art structures to protect against ESD of ±15kV at the

switch inputs without damage. The ESD structures with-

stand high ESD in all states: normal operation, shutdown,

and powered down. After an ESD event, the MAX6816–

MAX6818 keep working without latchup, whereas other

solutions can latch and must be powered down to

remove latchup.

www.maximintegrated.com

Maxim Integrated │  5

Share Link: