MAX6817EUT [MAXIM]
Logic Circuit, CMOS, PDSO6;
| 型号： | MAX6817EUT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Logic Circuit, CMOS, PDSO6 光电二极管 逻辑集成电路 |
| 文件： | 总10页 (文件大小：702K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4770; Rev 2; 12/05
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
General Description
Features
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 ±±25 levels and are ±12ꢀ5 VꢁES
protected for use in harsh industrial environments. They
feature singleSsupply operation from +±.75 to +2.25.
Undervoltage locꢀout circuitry ensures the output is in
the correct state upon powerSup.
♦ Robust 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
♦ 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
The single MAX6816 and dual MAX6817 are offered in
ꢁOT pacꢀages and require no external components.
Their low supply current maꢀes them ideal for use in
portable equipment.
♦ No External Components Required
♦ 6µA Supply Current
♦ Three-State Outputs for Directly Interfacing
The MAX6818 octal switch debouncer is designed for
dataSbus interfacing. The MAX6818 monitors switches
and provides a switch changeSofSstate output (CH),
simplifying microprocessor (µP) polling and interrupts.
Additionally, the MAX6818 has threeSstate outputs conS
trolled by an enable (EN) pin, and is pinScompatible
with the Lꢁ273 octal latch (except for the CH pin),
allowing easy interfacing to a digital data bus.
Switches to µP Data Bus (MAX6818)
♦ Switch Change-of-State Output Simplifies
Polling and Interrupts (MAX6818)
♦ Pin-Compatible with ’LS573 (MAX6818)
Ordering Information
PIN-
SOT
Applications
PART
TEMP RANGE
PACKAGE TOP MARK
µP ꢁwitch Interfacing
Industrial Instruments
PCSBased Instruments
Portable Instruments
Automotive Applications
Membrane Keypads
MAX6816VUꢁST S40°C to +82°C 4 ꢁOT143
MAX6817VUTST S40°C to +82°C 6 ꢁOT±3S6
KABA
AAAU
—
MAX6818VAP
S40°C to +82°C ±0 ꢁꢁOP
Note: There is a minimum order increment of 2500 pieces for
SOT packages.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
-in Configurations
Typical Operating Circuit
TOP VIEW
V
CC
V
4
CC
GND
1
2
MAX6816
µP
MAX6816
MECHANICAL
SWITCH
0.1µF
IN
OUT
RESET
DEBOUNCED
OUTPUT
IN
3
OUT
GND
SOT143
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
ABSOLUTE MAXIMUM RATINGS
5oltage (with respect to GNE)
Continuous Power Eissipation (T = +70°C)
A
5
.......................................................................S0.35 to +65
4SPin ꢁOT143 (derate 4.0mW/°C above +70°C)..........3±0mW
6SPin ꢁOT±3 (derate 8.7mW/°C above +70°C)............691mW
±0SPin ꢁꢁOP (derate 8.0mW/°C above +70°C) ...........640mW
Operating Temperature Range ...........................S40°C to +82°C
ꢁtorage Temperature Range.............................S62°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
IN_ (ꢁwitch Inputs) ..............................................S305 to +305
EN.........................................................................S0.35 to +65
OUT_, CH ...............................................S0.35 to (5 + 0.35)
OUT ꢁhortSCircuit Euration
CC
(One or Two Outputs to GNE)....................................Continuous
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
(5
= +±.75 to +2.25, T = S40°C to +82°C, unless otherwise noted. Typical values are at 5 = +25, T = +±2°C.) (Note 1)
A CC A
CC
PARAMETER
SYMBOL
CONDITIONS
= 0, IN_ = 5
CC
MIN
TYP
MAX UNITS
Operating 5oltage Range
ꢁupply Current
5
±.7
2.2
±0
60
5
CC
CC
I
5
= 25, I
6
µA
CC
OUT
MAX6818
MAX6816/MAX6817
±0
±0
40
20
Eebounce Euration
t
ms
5
EP
80
5
IL
0.8
Input Threshold
5
5
= 25
±.4
±.0
CC
CC
5
5
IH
= ±.75
Input Hysteresis
300
63
m5
ꢀΩ
mA
5
Input PullSUp Resistance
IN Input Current
3±
100
±1
I
5
= ±125
IN
IN
Input 5oltage Range
UndervoltageSLocꢀout Threshold
5
S±2
+±2
±.6
0.4
IN
1.9
5
5
I
I
= 1.6mA
ꢁINK
OL
5
ns
5
OUT_, CH Output 5oltage
EN Pulse Width
5
t
= 0.4mA
5
S 1.0
CC
OH
ꢁOURCV
±00
VN
5
5
= 25
0.8
0.8
1.7
1.1
±.4
±.0
±1
CC
CC
EN Threshold
= ±.75
I
µA
ns
EN Input Current
IL
EN Low to Out Active
Propagation Eelay
t
R = 10ꢀΩ, C = 100pF
100
100
PV
PE
PC
L
L
EN High to Out ThreeSꢁtate
Propagation Eelay
t
t
R = 1ꢀΩ, C = 12pF
ns
L
L
EN Low to CH Out High
Propagation Eelay
R = 10ꢀΩ, C = 20pF
100
±10
ns
L
L
5
= 0 or 5
µA
OUT_ ThreeSꢁtate Leaꢀage Current
OUT
CC
ESD CHARACTERISTICS
IVC1000S4S± Air Eischarge
±12
±8
VꢁE Protection
IN_
IVC1000S4S± Contact Eischarge
Human Body Model
ꢀ5
±12
Note 1: MAX6816 and MAX6817 production testing is done at T = +±2°C; overStemperature limits are guaranteed by design.
A
2
_______________________________________________________________________________________
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
Typical Operating Characteristics
(T = +±2°C, unless otherwise noted.)
A
DEBOUNCE OF CLOSING SWITCH
DEBOUNCE OF OPENING SWITCH
SUPPLY CURRENT vs. TEMPERATURE
7
6
5
4
3
2
1
0
V
= 5V
CC
CC
5V
5V
-5V
4V
-5V
4V
V
= 3V
0
0
V
= 5V
CC
V
= 5V
CC
10ms/div
10ms/div
-50
-25
0
25
50
75
100
TEMPERATURE (°C)
MAX6818 EN INPUT LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
OUTPUT LOGIC LEVEL
vs. SUPPLY VOLTAGE
5
4
3
2
1
0
6
5
4
3
2
1
V
, I
= 0.4mA
OH SOURCE
V
, I
= 1.6mA
OL SINK
0
2
2
3
4
5
6
3
4
SUPPLY VOLTAGE (V)
5
6
SUPPLY VOLTAGE (V)
V
CC
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
DEBOUNCE DELAY PERIOD
vs. TEMPERATURE
5
4
3
2
1
0
50
45
40
35
30
V
V
= 3V
= 5V
CC
CC
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
-in Description
PIN
NAME
FUNCTION
MAX6816
MAX6817
MAX6818
1
±
±
—
10
—
GNE
IN
Ground
ꢁwitch Input
—
—
3
1, 3
—
—
IN1, IN±
IN1–IN8
OUT
ꢁwitch Inputs
ꢁwitch Inputs
CMOꢁ Eebounced Output
±–9
—
—
—
—
4
4, 6
—
—
OUT±, OUT1
OUT8–OUT1
CMOꢁ Eebounced Outputs
CMOꢁ Eebounced Outputs
+±.75 to +2.25 ꢁupply 5oltage
1±–19
±0
2
5
CC
ActiveSLow, ThreeSꢁtate Vnable Input for outputs. Resets CH.
Tie to GNE to “always enable” outputs.
—
—
—
—
1
EN
CH
ChangeSofSꢁtate 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
IN
MAX6816
MAX6817
MAX6818
ESD
PROTECTION
Figure 1. Block Diagram
input 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 clocꢀs the
flipSflop, updating the output. Figure ± 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).
5irtually all mechanical switches bounce upon opening
or closing. These switch debouncers remove bounce
when a switch opens or closes by requiring that
sequentially clocꢀed 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 Loc5out
The undervoltage locꢀout circuitry ensures that the outS
puts are at the correct state on powerSup. While the supS
ply voltage is below the undervoltage threshold
(typically 1.95), the debounce circuitry remains transS
parent. ꢁwitch states are present at the logic outputs
without delay.
The circuit blocꢀ diagram (Figure 1) shows the funcS
tional blocꢀs consisting of an onSchip oscillator,
counter, exclusiveSNOR gate, and E flipSflop. When the
4
_______________________________________________________________________________________
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
t
DP
EN
t
EN
IN1
1
V
1
V
/2 CC
/2 CC
t
PE
t
OUT1–OUT8
PD
OUT NORMALLY
LOW
OUT1
1
1
V
/2 CC
V
OL
+ 0.5V
- 0.5V
t
PE
OUT NORMALLY
HIGH
V
V
OH
/2 CC
OUT1–OUT8
CH
IN2
t
PD
t
PC
1
V
/2 CC
OUT2
Figure 4. MAX6818 µP-Interface Timing Diagram
CH
+V
CC
MAX6818 ONLY
+V
CC
0.1µF
Figure 2. Input Characteristics
SW1
EN
I/O
IN1
IN8
µP
CH
IRQ
20V
MAX6818
IN
0
(20V/div)
-20V
OUT1
OUT8
D0
D7
SW8
4V
OUT
(2V/div)
0
Figure 5. MAX6818 Typical µP Interfacing Circuit
20ms/div
approximately 0.2mA (up to 4mA for eight inputs) from
the 5 supply. Eriving an input to +±25 will cause
CC
Figure 3. Switch Input 25ꢀ Fault Tolerance
approximately 0.3±mA of current (up to ±.6mA for eight
inputs) to flow bacꢀ into the 5 supply. If the total sysS
CC
Robust Ewitch Inputs
tem 5
supply current is less than the current flowing
CC
The switch inputs on the MAX6816/MAX6817/MAX6818
have overvoltage clamping diodes to protect against
damaging fault conditions. ꢁwitch input voltages
can safely swing ±±25 to ground (Figure 3). Proprietary
VꢁESprotection structures protect against high
VꢁE encountered in harsh industrial environments,
membrane ꢀeypads, and portable applications.
They are designed to withstand ± 12ꢀ5 per the
IVC1000S4S± Air Gap Eischarge Test and ±8ꢀ5 per the
IVC1000S4S± Contact Eischarge Test.
bacꢀ into the 5
supply, 5
will rise above normal
CC
CC
levels. In some lowScurrent systems, a zener diode on
may be required.
5
CC
1ꢀ5k ꢁED -rotection
As with all Maxim devices, VꢁESprotection structures
are incorporated on all pins to protect against electroS
static discharges encountered during handling and
assembly. The MAX6816/MAX6817/MAX6818 have
extra protection against static electricity. Maxim's engiS
neers have developed stateSofStheSart structures to proS
tect against VꢁE of ±12ꢀ5 at the switch inputs without
ꢁince there are 63ꢀΩ (typical) pullSup resistors conS
nected to each input, driving an input to S±25 will draw
_______________________________________________________________________________________
5
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
R
C
1M
R 1500Ω
D
R
50M to 100M
R 330Ω
D
C
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
CHARGE CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
100pF
STORAGE
CAPACITOR
s
C
s
150pF
STORAGE
CAPACITOR
SOURCE
SOURCE
Figure 6a. Human Body ESD Test Model
Figure 7a. IEC1000-4-2 ESD Test Model
I
I 100%
P
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
100%
90%
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
damage. The VꢁE structures withstand high VꢁE in all
states: normal operation, shutdown, and powered
down. After an VꢁE event, the MAX6816/MAX6817/
MAX6818 ꢀeep worꢀing without latchup, whereas other
solutions can latch and must be powered down to
remove latchup.
60ns
Figure 7b. IEC1000-4-2 ESD Generator Current Waveform
Human Body Model
Figure 6a shows the Human Body Model and Figure 6b
shows the current waveform it generates when disS
charged into a low impedance. This model consists of
a 100pF capacitor charged to the VꢁE voltage of interS
est, which is then discharged into the test device
through a 1.2ꢀΩ resistor.
VꢁE protection can be tested in various ways; these
products are characterized for protection to the followS
ing limits:
1) ±12ꢀ5 using the Human Body Model
±) ±8ꢀ5 using the ContactSEischarge method specified
in IVC1000S4S±
3) ±12ꢀ5 using IVC1000S4S±ꢂs AirSGap method.
IEC1000-4-2
The IVC1000S4S± standard covers VꢁE testing and perS
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX6816/
MAX6817/MAX6818 help you design equipment that
ESD Test Conditions
VꢁE performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
6
_______________________________________________________________________________________
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
meets Level 4 (the highest level) of IVC1000S4S±, withS
out the need for additional VꢁESprotection compoS
nents.
Machine Model
The Machine Model for VꢁE tests all pins using a
±00pF storage capacitor and zero discharge resisS
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing.
The major difference between tests done using the
Human Body Model and IVC1000S4S± is higher peaꢀ
current in IVC1000S4S±, because series resistance is
lower in the IVC1000S4S± model. Hence, the VꢁE withS
stand voltage measured to IVC1000S4S± is generally
lower than that measured using the Human Body
Model. Figure 7a shows the IVC1000S4S± model and
Figure 7b shows the current waveform for the 8ꢀ5,
IVC1000S4S±, Level 4, VꢁE ContactSEischarge test.
MAX6818 µ- Interfacing
The MAX6818 has an output enable (EN) input that
allows switch outputs to be threeSstated 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 readS
ing data. If the output enable is not used, tie EN to GNE
to “always enableꢂꢂ the switch outputs. If EN is low, CH is
always high. If a change of state is not required, leave
CH unconnected.
The AirSGap test involves approaching the device with
a charged probe. The ContactSEischarge method
connects the probe to the device before the probe is
energized.
-in 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
MAX6816 TRANꢁIꢁTOR COUNT: ±84
MAX6817 TRANꢁIꢁTOR COUNT: 497
MAX6818 TRANꢁIꢁTOR COUNT: ±130
ꢁUBꢁTRATV CONNVCTVE TO GNE
_______________________________________________________________________________________
7
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
-ac5age Information
(The pacꢀage drawing(s) in this data sheet may not reflect the most current specifications. For the latest pacꢀage outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, SOT-143, 4L
1
21-0052
E
1
8
_______________________________________________________________________________________
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
-ac5age Information (continued)
(The pacꢀage drawing(s) in this data sheet may not reflect the most current specifications. For the latest pacꢀage outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, SOT 6L BODY
1
21-0058
G
1
_______________________________________________________________________________________
9
1ꢀ5k ꢁEDꢂ-rotected, Eingle/Dual/Octal,
CMOE Ewitch Debouncers
-ac5age Information (continued)
(The pacꢀage drawing(s) in this data sheet may not reflect the most current specifications. For the latest pacꢀage outline information,
go to www.maxim-ic.com/packages.)
2
1
INCHES
MILLIMETERS
DIM
A
MIN
0.068
MAX
MIN
1.73
0.05
0.25
0.09
MAX
1.99
0.21
0.38
0.20
INCHES
MIN
MAX
MILLIMETERS
MIN
6.07
6.07
7.07
8.07
MAX
6.33
N
0.078
A1
B
D
D
D
D
D
0.239 0.249
0.239 0.249
0.278 0.289
0.317 0.328
14L
0.002 0.008
0.010 0.015
0.004 0.008
6.33 16L
7.33
8.33 24L
20L
C
E
H
D
SEE VARIATIONS
0.205 0.212 5.20
0.0256 BSC
0.397 0.407 10.07 10.33 28L
E
5.38
e
0.65 BSC
H
0.301 0.311 7.65
0.025 0.037 0.63
7.90
0.95
8∞
L
0∞
8∞
0∞
N
A
C
B
L
e
A1
D
NOTES:
1. D&E DO NOT INCLUDE MOLD FLASH.
2. MOLD FLASH OR PROTRUSIONS NOT TO EXCEED .15 MM (.006").
3. CONTROLLING DIMENSION: MILLIMETERS.
4. MEETS JEDEC MO150.
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, SSOP, 5.3 MM
APPROVAL
DOCUMENT CONTROL NO.
REV.
5. LEADS TO BE COPLANAR WITHIN 0.10 MM.
1
21-0056
C
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
10 ____________________Maxim Integrated -roducts, 120 Ean Gabriel Drive, Eunnyvale, CA 94086 408ꢂ737ꢂ7600
© ±002 Maxim Integrated Products
is a registered trademarꢀ of Maxim Integrated Products, Inc.
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