MAX6336US21D3+T [MAXIM]
Power Supply Support Circuit, Fixed, 1 Channel, +2.1VV, CMOS, PDSO4, LEAD FREE, TO-253, SOT-143, 4 PIN;
| 型号： | MAX6336US21D3+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, +2.1VV, CMOS, PDSO4, LEAD FREE, TO-253, SOT-143, 4 PIN 光电二极管 |
| 文件： | 总7页 (文件大小：175K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1412; Rev 2; 12/05
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
General Description
Features
The MAX6335/MAX6336/MAX6337 microprocessor (µP)
supervisory circuits monitor the power supplies in 1.8V
to 3.3V µP and digital systems. They increase circuit reli-
ability and reduce cost by eliminating external compo-
nents and adjustments. They also feature a debounced
manual-reset input.
♦ Ultra-Low 0.7V Operating Supply Voltage
♦ Low 3.3µA Supply Current
♦ Precision Monitoring of 1.8V and 2.5V Power-
Supply Voltages
♦ Reset Thresholds Available from 1.6V to 2.5V,
These devices perform a single function: they assert a
in Approximately 100mV Increments
reset signal whenever the V
supply voltage declines
CC
below a preset threshold or whenever manual reset is
asserted. Reset remains asserted for a preset timeout
♦ Debounced Manual Reset
♦ Fully Specified over Temperature
period after V
has risen above the reset threshold or
CC
after manual reset is deasserted. The only difference
among the three devices is their output. The MAX6336
(push/pull) and MAX6337 (open-drain) have an active-
low RESET output, while the MAX6335 (push/pull) has
an active-high RESET output. The MAX6335/MAX6336
♦ Three Power-On Reset Pulse Widths Available
(1ms min, 20ms min, 100ms min)
♦ Low Cost
♦ Three Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESET
are guaranteed to be in the correct state for V
down
CC
to 0.7V. The MAX6337 is guaranteed to be in the cor-
rect state for V down to 1.0V.
♦ Guaranteed RESET/RESET Valid to V
= 0.7V
CC
CC
(MAX6335/MAX6336)
The reset comparator in these ICs is designed to ignore
fast transients on V . Reset thresholds are factory-
CC
♦ Power-Supply Transient Immunity
♦ No External Components
♦ 4-Pin SOT143 Package
trimmable between 1.6V and 2.5V, in approximately
100mV increments. There are 15 standard versions
available (2500 piece minimum-order quantity); contact
the factory for availability of nonstandard versions
(10,000 piece minimum-order quantity). For space-criti-
cal applications, the MAX6335/MAX6336/MAX6337
come packaged in a 4-pin SOT143.
♦ Pin Compatible with MAX811/MAX812 and
MAX6314/MAX6315
Ordering Information
Applications
Pentium II™ Computers
Computers
PART*
TEMP. RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
4 SOT143
MAX6335US__D_-T
MAX6336US__D_-T
MAX6337US__D_-T
4 SOT143
Controllers
4 SOT143
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
* These devices are available in factory-set V
reset thresh-
CC
olds from 1.6V to 2.5V, in approximately 0.1V increments.
Choose the desired reset threshold suffix from Table 1 and
insert it in the blanks following “US” in the part number.
Factory-programmed reset timeout periods are also available.
Insert the number corresponding to the desired nominal reset
timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in
the blank following “D” in the part number. There are 15 stan-
dard versions with a required order increment of 2500 pieces.
Sample stock is generally held on the standard versions only
(see Selector Guide). Contact the factory for availability of non-
standard versions (required order increment is 10,000 pieces).
All devices available in tape-and-reel only.
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Selector Guide appears at end of data sheet.
Pentium II is a trademark of Intel Corp.
________________________________________________________________ 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.
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
Continuous Power Dissipation (T = +70°C)
A
V
......................................................................-0.3V to +6V
SOT143 (derate 4mW/°C above +70°C) .....................320mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
Push/Pull RESET or RESET, MR ............-0.3V to (V
Open-Drain RESET ..............................................-0.3V to +6V
+ 0.3V)
CC
Input Current (V ).............................................................20mA
CC
Output Current (RESET, RESET).........................................20mA
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
(VCC = full range, MR = VCC or unconnected, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C and
A
A
VCC = 3V, reset not asserted.)
PARAMETER
SYMBOL
CONDITIONS
MAX6335/MAX6336
MIN
0.7
TYP
MAX
UNITS
5.5
5.5
5.5
5.5
T = 0°C to +85°C
A
MAX6337
1.0
MAX6335/MAX6336
MAX6337
0.78
1.2
Supply Voltage Range
V
CC
T = -40°C to +85°C
V
A
MAX6335/MAX6336
MAX6337
T = -40°C to +125°C
A
1.2
5.5
3.0
3.3
6.0
7.0
VCC = 1.8V
VCC = 2.5V
Supply Current
Reset Threshold
I
No load
µA
V
CC
V
1.8%
V
TH +
1.8%
TH -
T = +25°C
A
V
TH
MAX633_US__D_-T,
Table 1
V
TH
V
TH -
V
TH +
3%
T = -40°C to +125°C
A
V
TH
3%
V
Falling Reset Delay
V
falling at 10V/ms
CC
24
1.5
30
µs
CC
MAX633_US__D1-T
MAX633_US__D2-T
MAX633_US__D3-T
1
2
Reset Active Timeout Period
20
40
ms
tRP
100
150
200
0.4
0.3
I
I
I
I
I
I
I
I
= 50µA, V ≥ 1.0V
CC
SINK
Reset
asserted
RESET Output Low Voltage
(MAX6336/MAX6337)
V
V
V
V
V
OL
OH
OH
= 500µA, V ≥ 1.8V
SINK
CC
= 200µA, V ≥ 1.8V
0.8V
SOURCE
SOURCE
SOURCE
SOURCE
CC
CC
CC
CC
CC
Reset not
asserted
RESET Output High Voltage
(MAX6336)
V
V
= 500µA, V ≥ 2.7V
0.8V
0.8V
0.8V
CC
= 1µA, V ≥ 1.0V
CC
Reset
asserted
= 200µA, V ≥ 1.8V
CC
RESET Output Voltage
(MAX6335)
= 500µA, V ≥ 1.8V
0.3
0.3
SINK
SINK
CC
Reset not
asserted
V
OL
= 1.2mA, V ≥ 2.7V
CC
1
µs
ns
µs
V
MR Minimum Pulse Width
MR Glitch Immunity
MR Reset Delay
V
V
= 2.6V
160
CC
CC
= 2.6V
0.42
V
0.3V
0.7V
CC
MR Threshold
MR
CC
12
20
30
kΩ
MR Pull-Up Resistance
RESET Output Leakage
Current (MAX6337)
0.5
µA
V
> V , RESET deasserted
TH
CC
2
_______________________________________________________________________________________
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
__________________________________________Typical Operating Characteristics
(Reset not asserted, T = +25°C, unless otherwise noted.)
A
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
OUTPUT VOLTAGE LOW
vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.050
1.040
1.030
1.020
1.010
1.000
0.990
0.980
0.970
0.960
0.950
80
70
60
50
40
30
20
10
0
V
= 2.2V
TH
V
I
= 2.5V
TH
= 500µA
SINK
RESET ASSERTED
V
= 2.5V
CC
T
= +25°C
T
A
= +85°C
A
V
0
= 1.8V
CC
T
= -40°C
1.50
A
RESET NOT ASSERTED
-60 -40 -20
20 40 60 80 100
-60 -40 -20
0
20 40 60 80 100
0.50
1.00
2.00
(V)
2.50
3.00
TEMPERATURE (°C)
TEMPERATURE (°C)
V
CC
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
V
CC
FALLING PROPAGATION DELAY
vs. TEMPERATURE
OUTPUT VOLTAGE HIGH
vs. SUPPLY VOLTAGE
160
140
120
100
80
80
600
500
400
300
200
100
0
V
= 2.2V
TH
70
60
50
40
30
20
10
ISOURCE = 100µA
RESET ASSERTED
V
FALLING AT 1V/ms
FALLING AT 10V/ms
CC
RESET OCCURS
60
T
= +25°C
T
A
V
CC
40
= -40°C
A
RESET DOES
NOT OCCUR
20
T
= +85°C
A
0
0.1
1
10
100
1000
-60 -40 -20
0
20 40 60 80 100
0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5
(V)
RESET COMPARATOR OVERDRIVE (mV)
TEMPERATURE (°C)
V
CC
_______________________________________________________________________________________
3
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
Pin Description
PIN
NAME
FUNCTION
MAX6336
MAX6337
1
MAX6335
1
GND
Ground
Active-Low Reset Output. RESET remains low while V
is below the reset
CC
threshold, or MR is asserted and for a reset timeout period (t ) after V
rises above the reset threshold, or MR is deasserted. RESET on the
MAX6337 is open-drain.
RP
CC
—
2
2
RESET
Active-High Reset Output. RESET remains high while V
is below the
CC
reset threshold, or MR is asserted and for a reset timeout period (t ) after
RP
—
RESET
V
rises above the reset threshold, or MR is deasserted. RESET also
CC
asserts when MR is low.
Manual-Reset Input. A logic low on MR asserts reset. Reset remains
3
4
3
4
MR
asserted as long as MR is low, and for the reset timeout period (t ) after
RP
MR goes high. Leave unconnected or connect to V
if not used.
CC
V
CC
Supply Voltage (0.7V to 5.5V)
signal. As the amplitude of the transient increases, the
maximum allowable pulse width decreases.
Applications Information
Manual-Reset Inputs
Many µP-based products require manual-reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset. Reset remains asserted while MR is low,
and for the reset active timeout period after MR returns
high. MR has an internal 20kΩ pull-up resistor, so it can
be left unconnected if not used. Connect a normally
open momentary switch from MR to GND to create a
manual-reset function; external debounce circuitry is
not required.
Ensuring a Valid Reset Output
down to V
= 0
CC
When V
falls below 1V and approaches the minimum
CC
operating voltage of 0.7V, push/pull-structured reset
sinking (or sourcing) capabilities decrease drastically.
High-impedance CMOS-logic inputs connected to the
RESET pin can drift to indeterminate voltages. This
does not present a problem in most cases, since most
µPs and circuitry do not operate at V
below 1V. For
CC
the MAX6336, where RESET must be valid down to 0,
adding a pull-down resistor between RESET and GND
removes stray leakage currents, holding RESET low
Interfacing to µPs with
Bidirectional Reset Pins
Since the RESET output on the MAX6337 is open-drain,
this device interfaces easily with µPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESET output directly
to the microcontroller’s (µC’s) RESET pin with a single
pull-up resistor allows either device to assert reset
(Figure 1).
V
CC
V
V
CC
CC
µP
MOTOROLA
68HCXX
MAX6337
Negative-Going V
Transients
CC
RESET
INPUT
MR
RESET
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration, negative-going
V
transients (glitches). The Typical Operating
CC
GND
GND
Characteristics show the Maximum Transient Duration
vs. Reset Comparator Overdrive graph. The graph
shows the maximum pulse width that a negative-going
V
transient may typically have without issuing a reset
CC
Figure 1. Interfacing to µPs with Bidirectional Reset Pins
4
_______________________________________________________________________________________
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
Table 1. Factory-Trimmed Reset
Thresholds*
V
CC
RESET
THRESHOLD
SUFFIX
T
= +25°C
T = -40°C to +125°C
A
A
MIN TYP MAX MIN
MAX
MAX6336
MAX633_US25D_
MAX633_US24D_
MAX633_US23D_
MAX633_US22D_
MAX633_US21D_
MAX633_US20D_
MAX633_US19D_
MAX633_US18D_
MAX633_US17D_
MAX633_US16D_
2.46 2.50 2.55
2.36 2.40 2.44
2.26 2.30 2.34
2.16 2.20 2.24
2.06 2.10 2.14
1.96 2.00 2.04
1.87 1.90 1.93
1.77 1.80 1.83
1.67 1.70 1.73
1.57 1.60 1.63
2.43
2.33
2.23
2.13
2.04
1.94
1.84
1.75
1.65
1.55
2.58
2.47
2.37
2.27
2.16
2.06
1.96
1.85
1.75
1.65
MR
RESET
100k
GND
(a)
V
CC
100k*
MAX6335
MR
RESET
* Factory-trimmed reset thresholds are available in approximately
100mV increments, with a 1.ꢀ8 room-temperature variance.
GND
(b)
*ASSUMES HIGH-Z RESET INPUT TO THE µP
Figure 2. Ensuring Reset Valid down to V
= 0
CC
(Figure 2a). The pull-down resistor value is not critical;
100kΩ is large enough not to load RESET, and small
enough to pull it low. For the MAX6335, where RESET
must be valid to V
= 0, a 100kΩ pull-up resistor
CC
between RESET and V
will hold RESET high when
CC
V
falls below 0.7V (Figure 2b).
CC
Since the MAX6337 has an open-drain, active-low out-
put, it typically uses a pull-up resistor. With this device,
RESET will most likely not maintain an active condition,
but will drift to a non-active level due to the pull-up
resistor and the reduced sinking capability of the open-
drain device. Therefore, this device is not recommend-
ed for applications where the RESET pin is required to
be valid down to V
= 0.
CC
_______________________________________________________________________________________
5
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
Selector Guide (standard versions*)
MINIMUM RESET
TIMEOUT (ms)
PART
OUTPUT STAGE
NOMINAL V (V)
TH
SOT TOP MARK
MAX6335US23D3-T
MAX6335US22D3-T
MAX6335US20D3-T
MAX6335US18D3-T
MAX6335US16D3-T
MAX6336US23D3-T
MAX6336US22D3-T
MAX6336US20D3-T
MAX6336US18D3-T
MAX6336US16D3-T
MAX6337US23D3-T
MAX6337US22D3-T
MAX6337US20D3-T
MAX6337US18D3-T
MAX6337US16D3-T
Push/Pull RESET
Push/Pull RESET
Push/Pull RESET
Push/Pull RESET
Push/Pull RESET
Push/Pull RESET
Push/Pull RESET
Push/Pull RESET
Push/Pull RESET
Push/Pull RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
2.30
2.20
2.00
1.80
1.60
2.30
2.20
2.00
1.80
1.60
2.30
2.20
2.00
1.80
1.60
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
KABQ
KAAR
KABP
KAAQ
KAAP
KAAW
KAAV
KAAU
KAAT
KAAS
KABS
KAAZ
KABR
KAAY
KAAX
* Sample stock is generally held on all standard versions.
Pin Configuration
Typical Operating Circuit
TOP VIEW
V
CC
V
CC
V
CC
V
CC
GND
1
4
µP
MAX6335
MAX6336
MAX6335
MAX6336
MAX6337
RESET
MR
RESET
(RESET)
GND
GND
RESET (RESET)
2
3
MR
PUSHBUTTON
SWITCH
SOT143
( ) ARE FOR MAX6335
( ) ARE FOR MAX6335
6
_______________________________________________________________________________________
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
Chip Information
TRANSISTOR COUNT: 505
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, SOT-143, 4L
1
21-0052
E
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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