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PDF MAX6818 Data sheet ( Hoja de datos )
| Número de pieza | MAX6818 | |
| Descripción | CMOS Switch Debouncers | |
| Fabricantes | Maxim Integrated | |
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Hay una vista previa y un enlace de descarga de MAX6818 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
General Description
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
controlled 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.
Applications
●● µP Switch Interfacing
●● Industrial Instruments
●● PC-Based Instruments
●● Portable Instruments
●● Membrane Keypads
Pin Configurations
TOP VIEW
GND 1
MAX6816
4 VCC
IN 2
3 OUT
SOT143
Pin Configurations continued at end of data sheet.
Benefits and Features
●● Switch Debouncer Integration Simplifies System
Interface to Mechanical Switches
• Single-Supply Operation from +2.7V to +5.5V
• No External Components Required
• Single (MAX6816), Dual (MAX6817), and
Octal (MAX6818) Versions Available
• 6μA Supply Current
●● Built-In Protection Circuitry Improves System
Reliability
• Inputs Can Exceed Power Supplies up to ±25V
• ESD Protection for Input Pins
-- ±15kV—Human Body Model
-- ±8kV—IEC 1000-4-2, Contact Discharge
-- ±15kV—IEC 1000-4-2, Air-Gap Discharge
●● Octal Version (MAX6818) Provides Direct Data
Bus Interface
• Three-State Outputs for Directly Interfacing to
μP (MAX6818)
• Switch Change-of-State Output Simplifies Polling
and Interrupts (MAX6818)
• Pin-Compatible with ‘LS573 (MAX6818)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
SOT
TOP MARK
MAX6816EUS-T -40°C to +125°C 4 SOT143
KABA
MAX6817EUT-T -40°C to +125°C 6 SOT23-6
AAAU
MAX6818EAP -40°C to +125°C 20 SSOP
—
Note: There is a minimum order increment of 2500 pieces for
SOT packages.
Devices are available in both leaded and lead(Pb)-free/RoHS-
compliant packaging. Specify lead-free by replacing “-T” with
“+T” when ordering.
Typical Operating Circuit
VCC
MECHANICAL
SWITCH
MAX6816
IN OUT
GND
0.1µF
µP
RESET
DEBOUNCED
OUTPUT
19-4770; Rev 5; 4/15
1 page  
MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
IN1
OUT1
IN2
OUT2
CH
tDP
MAX6818 ONLY
Figure 2. Input Characteristics
20V
IN 0V
(20V/div)
-20V
OUT
(2V/div)
4V
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
tPE
1/2
VCCOUT
NORMALLY
LOW
tPD
VOL + 0.5V
OUT1–OUT8
CH
tPE 1/2 VCC OUT NORMALLY
HIGH
tPC
1/2 VCC
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
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX6818.PDF ] | |
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