MAX6816EUS+T [MAXIM]
Logic Circuit, BICMOS, PDSO4, ROHS COMPLIANT, SOT-143, 4-PIN;
| 型号： | MAX6816EUS+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Logic Circuit, BICMOS, PDSO4, ROHS COMPLIANT, SOT-143, 4-PIN 信息通信管理 光电二极管 逻辑集成电路 |
| 文件： | 总8页 (文件大小：1279K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
General Description
Benefits and Features
● Switch Debouncer Integration Simplifies System
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.
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
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.
- ±8kV—IEC 1000-4-2, Contact Discharge
- ±15kV—IEC 1000-4-2, Air-Gap Discharge
● Octal Version (MAX6818) Provides Direct Data
Bus Interface
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.
• 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
SOT
PIN-
PACKAGE
PART
TEMP RANGE
Applications
TOP MARK
● µP Switch Interfacing
● Industrial Instruments
● PC-Based Instruments
● Portable Instruments
● Membrane Keypads
MAX6816EUS-T -40°C to +125°C 4 SOT143
MAX6817EUT-T -40°C to +125°C 6 SOT23-6
KABA
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.
Pin Configurations
Typical Operating Circuit
TOP VIEW
GND
1
4
V
CC
V
CC
MAX6816
MAX6816
µP
MECHANICAL
SWITCH
0.1µF
IN
3
OUT
2
IN
OUT
RESET
DEBOUNCED
OUTPUT
SOT143
GND
Pin Configurations continued at end of data sheet.
19-4770; Rev 5; 4/15
MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Absolute Maximum Ratings
Voltage (with respect to GND)
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........691mW
20-Pin SSOP (derate 8.0mW/°C above +70°C)..........640mW
Operating Temperature Range......................... -40°C to +125°C
Storage Temperature Range............................ -65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
V
......................................................................-0.3V to +6V
CC
IN_ (Switch Inputs).............................................-30V to +30V
EN........................................................................-0.3V to +6V
OUT_, CH............................................. -0.3V to (V
+ 0.3V)
CC
OUT Short-Circuit Duration
(One or Two Outputs to GND)...................................Continuous
Lead(Pb)-free...............................................................+260°C
Containing lead............................................................+240°C
Continuous Power Dissipation (T = +70°C)
A
4-Pin SOT143 (derate 4.0mW/°C above +70°C) ........320mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
= +2.7V to +5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
= +5V, T = +25°C.) (Note 1)
CC
A
CC A
PARAMETER
SYMBOL
CONDITIONS
= 5V, I = 0A, IN_ = V
CC
MIN
TYP
MAX
5.5
20
UNITS
V
V
CC
Operating Voltage Range
Supply Current
2.7
I
CC
V
CC
6
µA
OUT
MAX6818
MAX6816/MAX6817
20
20
40
50
40
t
Debounce Duration
DP
ms
V
80
V
V
IL
0.8
Input Threshold
V
= 5V
2.4
2.0
CC
IH
V
V
CC
= 2.7V
Input Hysteresis
300
63
mV
kW
mA
V
Input Pullup Resistance
IN Input Current
32
100
±1
I
IN
V
= ±15V
IN
V
Input Voltage Range
IN
-25
+25
2.6
0.4
Undervoltage-LockoutThreshold
1.9
V
V
OL
I
= 1.6mA
SINK
OUT_, CHOutput Voltage
ENPulse Width
V
ns
V
V
OH
I
= 0.4mA
V
- 1.0
SOURCE
CC
t
EN
200
V
V
= 5V
0.8
0.8
1.7
1.1
2.4
2.0
±1
CC
ENThreshold
= 2.7V
CC
I
ENInput Current
IL
µA
ns
EN Low to Out Active
t
t
t
PE
PD
PC
R = 10k
W
, C = 100pF
100
100
L
L
Propagation Delay
ENHigh to Out Three-State
R = 1k
W, C = 15pF
ns
L
L
PropagationDelay
ENLow to CH Out High
R = 10k
W
, C = 50pF
100
±10
ns
L
L
PropagationDelay
OUT_Three-State Leakage Current
V
= 0V or V
µA
OUT
CC
ESD CHARACTERISTICS
IEC 1000-4-2 Air-Gap Discharge
IEC 1000-4-2 Contact Discharge
Human Body Model
±15
±8
ESD Protection
IN_
kV
±15
Note 1: MAX6816 and MAX6817 production testing is done at T = +25°C; overtemperature limits are guaranteed by design.
A
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MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
SUPPLY CURRENT vs. TEMPERATURE
DEBOUNCE OF CLOSING SWITCH
DEBOUNCE OF OPENING SWITCH
7
6
V
= 5V
CC
5
4
3
2
1
0
5V
5V
-5V
4V
-5V
4V
V
CC
= 3V
0V
0V
V
CC
= 5V
V
= 5V
CC
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (C)
10ms/div
10ms/div
OUTPUT LOGIC LEVEL
vs. SUPPLY VOLTAGE
MAX6818 EN INPUT LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
6
5
4
3
2
1
0
5
4
3
2
1
0
V
, I
= 0.4mA
OH SOURCE
V
, I
= 1.6mA
OL SINK
2
3
4
5
6
2
3
4
5
6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
DEBOUNCE DELAY PERIOD
vs. TEMPERATURE
V
CC
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
50
5
4
3
2
1
0
45
40
35
30
V
= 5V
= 3V
CC
V
CC
-40 -25 -10
5
20 35 50 65 80 95 100 125
-40 -25 -10
5
20 35 50 65 80 95 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
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MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Pin Description
PIN
NAME
FUNCTION
MAX6816
MAX6817
MAX6818
1
2
2
—
10
—
GND
IN
Ground
Switch Input
—
—
3
1, 3
—
—
IN1, IN2
IN1–IN8
OUT
Switch Inputs
2–9
—
SwitchInputs
—
CMOSDebouncedOutput
CMOSDebouncedOutputs
—
—
4
4, 6
—
5
—
OUT2, OUT1
12–19
20
OUT8–OUT1 CMOS Debounced Outputs
V
CC
+2.7V to +5.5V Supply Voltage
Active-Low, Three-State Enable Input for outputs. Resets CH.
—
—
—
—
1
EN
CH
Tie to GND to “always enable” outputs.
Change-of-State Output. Goes low on switch input change of
state. Resets on EN. Leave unconnected if not used.
11
D
Q
OUT
V
CC
V
CC
D
Q
LOAD
COUNTER
V
CC
OSC.
R
R
PU
UNDER-
VOLTAGE
LOCKOUT
MAX6816
MAX6817
MAX6818
IN
ESD
PROTECTION
Figure 1. Block Diagram
does not equal the output, the XNOR gate issues a
counter 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.
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.
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.
The circuit block diagram (Figure 1) shows the
functional blocks consisting of an on-chip oscillator, counter,
exclusive-NOR gate, and D flip-flop. When the input
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MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
EN
t
t
DP
EN
1
V
1
V
/2 CC
/2 CC
IN1
t
PE
t
OUT1–OUT8
PD
OUT NORMALLY
LOW
1
1
V
/2 CC
V
OL
+ 0.5V
- 0.5V
OUT1
t
PE
OUT NORMALLY
HIGH
V
V
OH
/2 CC
OUT1–OUT8
t
PD
IN2
t
PC
1
V
/2 CC
CH
OUT2
Figure 4. MAX6818 μP Interface Timing Diagram
CH
+V
CC
+V
CC
0.1µF
MAX6818 ONLY
SW1
Figure 2. Input Characteristics
EN
CH
I/O
IN1
IN8
µP
IRQ
MAX6818
20V
IN
OUT1
OUT8
D0
D7
0V
(20V/div)
-20V
SW8
4V
OUT
(2V/div)
0V
Figure 5. MAX6818 Typical μP Interfacing Circuit
inputs) to flow back into the V
supply. If the total system
CC
V
supply current is less than the current flowing back
20ms/div
CC
into the V
supply, V
will rise above normal levels.
CC
CC
Figure 3. Switch Input ±25V Fault Tolerance
In some low-current systems, a zener diode on V
be required.
may
CC
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.
±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.
Since there are 63kW (typical) pullup resistors
connected to each input, driving an input to -25V draws
approximately 0.5mA (up to 4mA for eight inputs) from
the V
supply. Driving an input to +25V will cause
CC
approximately 0.32mA of current (up to 2.6mA for eight
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MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
R
C
50MΩ to 100MΩ
R 330Ω
D
R
C
1MΩ
R 1500Ω
D
DISCHARGE
RESISTANCE
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
CHARGE CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
DEVICE
UNDER
TEST
C
s
100pF
STORAGE
CAPACITOR
C
s
150pF
STORAGE
CAPACITOR
SOURCE
SOURCE
Figure 6a. Human Body ESD Test Model
Figure 7a. IEC 1000-4-2 ESD Test Model
I
100%
90%
I
100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
P
r
AMPERES
36.8%
10%
0
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
10%
Figure 6b. Human Body Current Waveform
t
t
= 0.7ns to 1ns
r
30ns
60ns
ESD protection can be tested in various ways;
these products are characterized for protection to the
following limits:
Figure 7b. IEC 1000-4-2 ESD Generator Current Waveform
discharged into a low impedance. This model consists
of a 100pF capacitor charged to the ESD voltage of
interest, which is then discharged into the test device
through a 1.5kW resistor.
1) ±15kV using the Human Body Model
2) ±8kV using the Contact-Discharge method specified
in IEC 1000-4-2
3) ±15kV using IEC 1000-4-2’s Air-Gap method.
IEC 1000-4-2
ESD Test Conditions
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not
specifically refer to integrated circuits. The MAX6816–
MAX6818 help you design equipment that meets
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Level
4
(the highest level) of IEC 1000-4-2,
Human Body Model
without the need for additional ESD-protection
components.
Figure 6a shows the Human Body Model and Figure
6b shows the current waveform it generates when
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MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
The major difference between tests done using the Human
Body Model and IEC 1000-4-2 is higher peak current in
IEC 1000-4-2, because series resistance is lower in the
IEC 1000-4-2 model. Hence, the ESD withstand volt-
age measured to IEC 1000-4-2 is generally lower than
that measured using the Human Body Model. Figure 7a
shows the IEC 1000-4-2 model and Figure 7b shows the
current waveform for the 8kV, IEC 1000-4-2, Level 4, ESD
Contact-Discharge test.
Machine Model
The Machine Model for ESD tests all pins using a 200pF
storage capacitor and zero discharge resistance. Its
objective is to emulate the stress caused by contact that
occurs with handling and assembly during manufacturing.
MAX6818 µP Interfacing
The MAX6818 has an output enable (EN) input that
allows switch outputs to be three-stated on the µP data
bus until polled by the µP. Also, state changes at the
switch inputs are detected, and an output (CH) goes
low after the debounce period to signal the µP. Figure
4 shows the timing diagram for enabling outputs and
reading data. If the output enable is not used, tie EN to
GND to “always enable” the switch outputs. If EN is low,
CH is always high. If a change of state is not required,
leave CH unconnected.
The Air-Gap test involves approaching the device with
a
charged probe. The Contact-Discharge method
connects the probe to the device before the probe is ener-
gized.
Pin Configurations (continued)
TOP VIEW
EN
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
1
2
3
4
5
6
7
8
9
20 V
CC
19 OUT1
18 OUT2
17 OUT3
16 OUT4
15 OUT5
14 OUT6
13 OUT7
12 OUT8
11 CH
IN1
GND
IN2
1
2
3
6
5
4
OUT1
MAX6818
MAX6817
V
CC
OUT2
SOT23-6
GND 10
SSOP
Chip Information
SUBSTRATE CONNECTED TO GND
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
4 SOT143
6 SOT23
20 SSOP
U4-1
U6-4
21-0052
21-0058
21-0056
90-0183
90-0175
90-0094
A20-1
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MAX6816/MAX6817/
MAX6818
±15kV ESD-Protected, Single/Dual/Octal,
CMOS Switch Debouncers
Revision History
REVISION
REVISION
DATE
PAGES
DESCRIPTION
CHANGED
NUMBER
0
7/98
8/10
Initial release
—
Updated Ordering Information, Electrical Characteristics, Typical Operating
Characteristics, and the Undervoltage Lockout section.
3
1–4, 7
4
5
7/14
4/15
No /V OPNs; removed automotive reference from Applications section
Updated Benefits and Features section
1
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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