MAX6817 MAXIM [Maxim Integrated Products], MAX6817 Datasheet

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MAX6817

Manufacturer Part Number
MAX6817
Description
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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The MAX6816/MAX6817/MAX6818 are single, dual, and
octal switch debouncers that provide clean interfacing
of mechanical switches to digital systems. They accept
one or more bouncing inputs from a mechanical switch
and produce a clean digital output after a short, preset
qualification delay. Both the switch opening bounce
and the switch closing bounce are removed. Robust
switch inputs handle ±25V levels and are ±15kV ESD-
protected for use in harsh industrial environments. They
feature single-supply operation from +2.7V to +5.5V.
Undervoltage lockout circuitry ensures the output is in
the correct state upon power-up.
The single MAX6816 and dual MAX6817 are offered in
SOT packages and require no external components.
Their low supply current makes them ideal for use in
portable equipment.
The MAX6818 octal switch debouncer is designed for
data-bus interfacing. The MAX6818 monitors switches
and provides a switch change-of-state output (CH),
simplifying microprocessor (µP) polling and interrupts.
Additionally, the MAX6818 has three-state outputs con-
trolled by an enable (EN) pin, and is pin-compatible
with the ‘LS573 octal latch (except for the CH pin),
allowing easy interfacing to a digital data bus.
19-4770; Rev 1; 1/99
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MECHANICAL
SWITCH
µP Switch Interfacing
Industrial Instruments
PC-Based Instruments
Portable Instruments
Automotive Applications
Membrane Keypads
IN
MAX6816
Typical Operating Circuit
GND
________________________________________________________________ Maxim Integrated Products
±15kV ESD-Protected, Single/Dual/Octal,
OUT
General Description
V
CC
0.1 F
DEBOUNCED
OUTPUT
Applications
RESET
P
CMOS Switch Debouncers
Note: There is a minimum order increment of 2500 pieces for
SOT packages.
MAX6816EUS-T
MAX6817EUT-T
MAX6818EAP
Pin Configurations continued at end of data sheet.
Robust Inputs can Exceed Power Supplies
up to ±25V
ESD Protection for Input Pins
Small SOT Packages (4 and 6 pins)
Single-Supply Operation from +2.7V to +5.5V
Single (MAX6816), Dual (MAX6817), and Octal
(MAX6818) Versions Available
No External Components Required
6µA Supply Current
Three-State Outputs for Directly Interfacing
Switches to µP Data Bus (MAX6818)
Switch Change-of-State Output Simplifies
Polling and Interrupts (MAX6818)
Pin-Compatible with ’LS573 (MAX6818)
TOP VIEW
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
PART
GND
IN
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
1
2
Ordering Information
SOT143
MAX6816
Pin Configurations
4 SOT143
6 SOT23-6
20 SSOP
PIN-
PACKAGE
3
4
V
OUT
CC
Features
TOP MARK
KABA
AAAU
SOT
1

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MAX6817 Summary of contents

Page 1

... Undervoltage lockout circuitry ensures the output is in the correct state upon power-up. The single MAX6816 and dual MAX6817 are offered in SOT packages and require no external components. Their low supply current makes them ideal for use in portable equipment. ...

Page 2

... EN Low to CH Out High Propagation Delay OUT_ Three-State Leakage Current ESD CHARACTERISTICS ESD Protection Note 1: MAX6816 and MAX6817 production testing is done _______________________________________________________________________________________ Continuous Power Dissipation (T 4-Pin SOT143 (derate 4.0mW/°C above +70°C)..........320mW 6-Pin SOT23 (derate 8.7mW/°C above +70°C)............691mW 20-Pin SSOP (derate 8.0mW/° ...

Page 3

ESD-Protected, Single/Dual/Octal +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. TEMPERATURE -50 - TEMPERATURE (°C) OUTPUT LOGIC ...

Page 4

... ESD PROTECTION Figure 1. Block Diagram _______________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 ...

Page 5

... Figure 3. Switch Input ±25V Fault Tolerance Robust Switch Inputs The switch inputs on the MAX6816/MAX6817/MAX6818 have overvoltage clamping diodes to protect against damaging fault conditions. Switch input voltages can 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 ± ...

Page 6

... Figure 6b. Human Body Current Waveform damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, the MAX6816/MAX6817/ MAX6818 keep working without latchup, whereas other solutions can latch and must be powered down to remove latchup. ...

Page 7

... If a change of state is not required, leave CH unconnected. Pin Configurations (continued) 6 OUT1 OUT2 ___________________Chip Information MAX6816 TRANSISTOR COUNT: 284 MAX6817 TRANSISTOR COUNT: 497 MAX6818 TRANSISTOR COUNT: 2130 SUBSTRATE CONNECTED TO GND Machine Model MAX6818 µP Interfacing IN1 2 ...

Page 8

ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers 8 _______________________________________________________________________________________ Package Information ...

Page 9

ESD-Protected, Single/Dual/Octal, _______________________________________________________________________________________ CMOS Switch Debouncers Package Information (continued) 9 ...

Page 10

ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers 10 ______________________________________________________________________________________ Package Information (continued) ...

Page 11

ESD-Protected, Single/Dual/Octal, ______________________________________________________________________________________ CMOS Switch Debouncers NOTES 11 ...

Page 12

ESD-Protected, Single/Dual/Octal, CMOS Switch Debouncers Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are Maxim cannot assume responsibility for use of any circuitry other than ...

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