MAX6334UR25D3-T [MAXIM]
Voltage Detector ; 电压检测器\n
| 型号： | MAX6334UR25D3-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Voltage Detector
|
| 文件： | 总6页 (文件大小：152K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1411; Rev 1; 6/00
3-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits
General Description
Features
The MAX6332/MAX6333/MAX6334 microprocessor (µP)
supervisory circuits monitor the power supplies in 1.8V
to 3.3V µP and digital systems. They increase circuit
reliability and reduce cost by eliminating external com-
ponents and adjustments.
ꢀ Ultra-Low 0.7V Operating Supply Voltage
ꢀ Low 3.3µA Supply Current
ꢀ Precision Monitoring of 1.8V and 2.5V Power-
Supply Voltages
These devices perform a single function: they assert a
ꢀ Reset Thresholds Available from 1.6V to 2.5V,
reset signal whenever the V
supply voltage declines
CC
in Approximately 100mV Increments
below a preset threshold, keeping it asserted for a pre-
set timeout period after V has risen above the reset
ꢀ Fully Specified over Temperature
CC
threshold. The only difference among the three devices
is their output. The MAX6333 (push/pull) and MAX6334
(open-drain) have an active-low RESET output, while
the MAX6332 (push/pull) has an active-high RESET out-
put. The MAX6332/MAX6333 are guaranteed to be in
ꢀ 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
the correct state for V
down to 0.7V. The MAX6334 is
CC
guaranteed to be in the correct state for V
1.0V.
down to
CC
ꢀ Guaranteed RESET/RESET Valid to V
= 0.7V
CC
The reset comparator in these ICs is designed to ignore
fast transients on V . Reset thresholds are factory-
CC
(MAX6332/MAX6333)
ꢀ Power-Supply Transient Immunity
ꢀ No External Components
ꢀ 3-Pin SOT23 Package
trimmable between 1.6V and 2.5V, in approximately
100mV increments. There are 15 standard versions
available (2,500 piece minimum-order quantity); con-
tact the factory for availability of nonstandard versions
(10,000 piece minimum-order quantity). For space-criti-
cal applications, the MAX6332/MAX6333/MAX6334
come packaged in a 3-pin SOT23.
ꢀ Pin Compatible with MAX809/MAX810 and
MAX6326/MAX6327/MAX6328
Applications
Pentium II™ Computers
Computers
Ordering Information
Controllers
PART*
TEMP. RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
3 SOT23-3
MAX6332UR__D_-T
MAX6333UR__D_-T
MAX6334UR__D_-T
Intelligent Instruments
3 SOT23-3
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
3 SOT23-3
* 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 “UR” 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.
Selector Guide appears at end of data sheet.
Pentium II is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
This Material Copyrighted by Its Respective Manufacturer
3-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
Continuous Power Dissipation (T = +70°C)
A
V
......................................................................-0.3V to +6V
SOT23-3 (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, RESET .......................-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, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C and V
= 3V, reset not assert-
A
A
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
0.7
TYP
MAX
5.5
UNITS
MAX6332/MAX6333
MAX6334
T
A
= 0°C to +85°C
1.0
5.5
MAX6332/MAX6333
MAX6334
0.78
1.2
5.5
Supply Voltage Range
V
CC
T = -40°C to +85°C
A
V
5.5
MAX6332/MAX6333
MAX6334
T = -40°C to +125°C
A
1.2
5.5
V
V
= 1.8V
= 2.5V
3.0
3.3
6.0
7.0
CC
Supply Current
Reset Threshold
I
No load
µA
V
CC
CC
V
1.8%
V
TH +
1.8%
TH -
V
TH
T = +25°C
A
MAX633_UR__D_-T,
Table 1
V
TH
V
TH -
V
TH +
3%
V
TH
T = -40°C to +125°C
A
3%
V
CC
Falling Reset Delay
V
CC
falling at 10V/ms
24
µs
MAX633_UR__D1-T
MAX633_UR__D2-T
MAX633_UR__D3-T
1
20
100
1.5
30
150
2
40
200
0.4
Reset Active Timeout Period
ms
tRP
I
I
I
I
I
I
I
I
= 50µA, V ≥ 1.0V
CC
SINK
Reset
asserted
RESET Output Low Voltage
(MAX6333/MAX6334)
V
V
V
OL
OH
OH
= 500µA, V ≥ 1.8V
0.3
SINK
CC
= 200µA, V ≥ 1.8V
0.8V
SOURCE
SOURCE
SOURCE
SOURCE
CC
CC
CC
CC
CC
Reset not
asserted
RESET Output High Voltage
(MAX6333)
V
V
= 500µA, V ≥ 2.7V
0.8V
0.8V
0.8V
CC
= 1µA, V ≥ 1.0V
CC
Reset
asserted
V
= 200µA, V ≥ 1.8V
CC
RESET Output Voltage
(MAX6332)
= 500µA, V ≥ 1.8V
0.3
0.3
SINK
SINK
CC
Reset not
asserted
V
OL
V
= 1.2mA, V ≥ 2.7V
CC
RESET Output Leakage
Current (MAX6334)
0.5
µA
V
CC
> V
RESET deasserted
TH,
2
_______________________________________________________________________________________
This Material Copyrighted by Its Respective Manufacturer
3-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits
Typical Operating Characteristics
(Reset not asserted, T = +25°C, unless otherwise noted.)
A
OUTPUT VOLTAGE LOW
vs. SUPPLY VOLTAGE
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
80
70
60
50
40
30
20
10
0
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
V
= 2.5V
= 500µA
TH
V
= 2.2V
TH
I
SINK
RESET ASSERTED
V
= 2.5V
CC
T
= +25°C
A
V
CC
= 1.8V
T = +85°C
A
T
= -40°C
A
RESET NOT ASSERTED
0.5
1.00
1.50
2.00
2.50
3.00
-60 -40 -20
0
20 40 60 80 100
-60 -40 -20
0
20 40 60 80 100
V
(V)
TEMPERATURE (°C)
TEMPERATURE (°C)
CC
V
FALLING PROPAGATION DELAY
vs. TEMPERATURE
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
CC
OUTPUT VOLTAGE HIGH
vs. SUPPLY VOLTAGE
160
140
120
100
80
80
70
60
50
40
30
20
10
600
500
400
300
200
100
0
V
= 2.2V
TH
ISOURCE = 100µA
RESET ASSERTED
V
FALLING AT 1V/ms
FALLING AT 10V/ms
CC
RESET OCCURS
60
T
= +25°C
A
V
CC
40
T
= -40°C
A
RESET DOES
NOT OCCUR
20
T
= +85°C
A
0
-60 -40 -20
0
20 40 60 80 100
0.1
1
10
100
1000
0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5
(V)
TEMPERATURE (°C)
RESET COMPARATOR OVERDRIVE (mV)
V
CC
Pin Description
PIN
NAME
GND
FUNCTION
MAX6333
MAX6334
1
MAX6332
1
Ground
Active-Low Reset Output. RESET remains low while V
is below the reset
CC
—
2
threshold and for a reset timeout period (t ) after V
rises above the
RESET
RP
CC
reset threshold. RESET on the MAX6334 is open-drain.
Active-High Reset Output. RESET remains high while V
is below the
CC
2
3
—
3
RESET
reset threshold and for a reset timeout period (t ) after V
the reset threshold.
rises above
RP
CC
V
CC
Supply Voltage (0.7V to 5.5V)
_______________________________________________________________________________________
3
This Material Copyrighted by Its Respective Manufacturer
3-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits
______________Applications Information
V
CC
Interfacing to µPs with Bidirectional
Reset Pins
V
V
CC
CC
Since the RESET output on the MAX6334 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).
µP
MOTOROLA
68HCXX
MAX6334
RESET
INPUT
RESET
GND
GND
Negative-Going V
CC
Transients
Figure 1. Interfacing to µPs with Bidirectional Reset Pins
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
CC
V
CC
transients (glitches). The Typical Operating Characteristics
show the Maximum Transient Duration vs. Reset
Comparator Overdrive graph. The graph shows the maxi-
V
CC
mum pulse width that a negative-going V transient may
CC
100k*
MAX6333
MAX6332
typically have without issuing a reset signal. As the ampli-
tude of the transient increases, the maximum allowable
pulse width decreases.
RESET
RESET
100k
GND
GND
Ensuring a Valid Reset Output
Down to VCC = 0
falls below 1V and approaches the minimum
(a)
(b)
When V
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
*ASSUMES HIGH-Z RESET INPUT TO THE µP
Figure 2. Ensuring Reset Valid Down to V
= 0
CC
µPs and circuitry do not operate at V
below 1V. For
CC
Table 1. Factory-Trimmed Reset
Thresholds*
the MAX6333, where RESET must be valid down to 0,
adding a pull-down resistor between RESET and GND
removes stray leakage currents, holding RESET low
(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 MAX6332, where RESET
RESET-
THRESHOLD
SUFFIX
T
= +25°C
T
= -40°C to +125°C
A
A
MIN TYP MAX MIN
MAX
MAX633_UR25D_ 2.46 2.50 2.55 2.43
MAX633_UR24D_ 2.36 2.40 2.44 2.33
MAX633_UR23D_ 2.26 2.30 2.34 2.23
MAX633_UR22D_ 2.16 2.20 2.24 2.13
MAX633_UR21D_ 2.06 2.10 2.14 2.04
MAX633_UR20D_ 1.96 2.00 2.04 1.94
MAX633_UR19D_ 1.87 1.90 1.93 1.84
2.58
2.47
2.37
2.27
2.16
2.06
1.96
1.85
1.75
1.65
must be valid to V
= 0, a 100kΩ pull-up resistor
CC
between RESET and V
will hold RESET high when
CC
V
CC
falls below 0.7V (Figure 2b).
Since the MAX6334 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
MAX633_UR18D_ 1.77 1.80 1.83
MAX633_UR17D_ 1.67 1.70 1.73
MAX633_UR16D_ 1.57 1.60 1.63
1.75
1.65
1.55
be valid down to V
= 0.
CC
* Factory-trimmed reset thresholds are available in approximately
100mV increments, with a 1.ꢀ8 room-temperature variance.
4
_______________________________________________________________________________________
This Material Copyrighted by Its Respective Manufacturer
3-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits
Pin Configuration
Typical Operating Circuit
TOP VIEW
V
CC
1
GND
V
V
CC
CC
µP
MAX6332
MAX6333
MAX6332
MAX6333
MAX6334
RESET
INPUT
3
V
CC
RESET
(RESET)
GND
GND
2
RESET (RESET)
SOT23-3
( ) ARE FOR MAX6332
(
) ARE FOR MAX6332
Selector Guide (Standard Versions*)
MINIMUM RESET
TIMEOUT (ms)
PART
OUTPUT STAGE
NOMINAL V (V)
TH
SOT TOP MARK
MAX6332UR23D3-T
MAX6332UR22D3-T
MAX6332UR20D3-T
MAX6332UR18D3-T
MAX6332UR16D3-T
MAX6333UR23D3-T
MAX6333UR22D3-T
MAX6333UR20D3-T
MAX6333UR18D3-T
MAX6333UR16D3-T
MAX6334UR23D3-T
MAX6334UR22D3-T
MAX6334UR20D3-T
MAX6334UR18D3-T
MAX6334UR16D3-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
FZDM
FZCN
FZDL
FZCM
FZCL
FZCS
FZCR
FZCQ
FZCP
FZCO
FZDO
FZCV
FZDN
FZCU
FZCT
* Sample stock is generally held on all standard versions.
_______________________________________________________________________________________
5
This Material Copyrighted by Its Respective Manufacturer
3-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits
Chip Information
TRANSISTOR COUNT: 505
Package Information
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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
This Material Copyrighted by Its Respective Manufacturer
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