MAX6333UR17D2中文资料

General Description

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.

These devices perform a single function: they assert a reset signal whenever the V CC supply voltage declines below a preset threshold, keeping it asserted for a pre-set timeout period after V CC has risen above the reset 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 the correct state for V CC down to 0.7V. The MAX6334 is guaranteed to be in the correct state for V CC down to 1.0V.

The reset comparator in these ICs is designed to ignore fast transients on V CC . Reset thresholds are factory-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/MAX6334come packaged in a 3-pin SOT23.

Applications

Pentium II? Computers Computers Controllers

Intelligent Instruments

Critical μP/μC Power Monitoring Portable/Battery-Powered Equipment Automotive

Features

?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,in Approximately 100mV Increments ?Fully Specified over Temperature

?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 ?Guaranteed RESET/RESET Valid to V CC = 0.7V (MAX6332/MAX6333)?Power-Supply Transient Immunity ?No External Components ?3-Pin SOT23 Package

?Pin Compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328

MAX6332/MAX6333/MAX6334

3-Pin, Ultra-Low-Voltage, Low-Power

μP Reset Circuits

________________________________________________________________Maxim Integrated Products

1

19-1411; Rev 2; 12/05

Ordering Information

* These devices are available in factory-set V CC reset thresh-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.

Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.

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.

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at https://www.wendangku.net/doc/789499080.html,.

M A X 6332/M A X 6333/M A X 6334

3-Pin, Ultra-Low-Voltage, Low-Power μP Reset Circuits 2_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V CC = full range, T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C and V CC = 3V, reset not assert-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.

Terminal Voltage (with respect to GND)

V CC ......................................................................-0.3V to +6V Push/Pull RESET, RESET .......................-0.3V to (V CC + 0.3V)Open-Drain RESET ..............................................-0.3V to +6V Input Current (V CC ).............................................................20mA Output Current (RESET, RESET ).........................................20mA

Continuous Power Dissipation (T A = +70°C)

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

3-Pin, Ultra-Low-Voltage, Low-Power

μP Reset Circuits

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2.02.62.2

3.03.63.83.43.2

4.0-60

2.4-40

-20

2.820

40

60

80

100

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

I C C (μA )

0.950

0.9900.9701.0001.0301.0401.0201.0101.050-60-400.980-2000.96020406080100

NORMALIZED RESET TIMEOUT PERIOD

vs. TEMPERATURE

TEMPERATURE (°C)

N O R M A L I Z E D R E S E T T I M E O U T P E R I O D

10

20-20403070605080

-600-4020406080100

V CC

FALLING PROPAGATION DELAY

vs. TEMPERATURE

TEMPERATURE (°C)

P R O P A G A T I O N D E L A Y (μs )

1001000

100

2004003005006000.1

110MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE

RESET COMPARATOR OVERDRIVE (mV)

M A X I M U M T R A N S I E N T D U R A T I O N (μs )

40208060100120140160

0.5 1.0 1.250.75 1.5 1.75 2.0 2.25 2.5

OUTPUT VOLTAGE HIGH vs. SUPPLY VOLTAGE

V CC (V)

O U T P U T V O L T A G E H I G H (V C C - V O H ) (m V )

2010

306070504080

0.5 1.00 1.50 2.00 2.50 3.00

OUTPUT VOLTAGE LOW vs. SUPPLY VOLTAGE

V CC (V)

O U T P U T V O L T A G E L O W (m V )

Typical Operating Characteristics

(Reset not asserted, T A = +25°C, unless otherwise noted.)

MAX6332/MAX6333/MAX6334

Pin Description

M A X 6332/M A X 6333/M A X 6334

3-Pin, Ultra-Low-Voltage, Low-Power μP Reset Circuits 4_______________________________________________________________________________________

______________Applications Information

Interfacing to μPs with Bidirectional

Reset Pins

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).

Negative-Going V CC Transients

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 transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Comparator Overdrive graph. The graph shows the maxi-mum pulse width that a negative-going V CC transient may typically have without issuing a reset signal. As the ampli-tude of the transient increases, the maximum allowable pulse width decreases.

Ensuring a Valid Reset Output

Down to V CC = 0

When V CC falls below 1V and approaches the minimum 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 CC below 1V. For 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;100k ?is large enough not to load RESET and small enough to pull it low. For the MAX6332, where RESET must be valid to V CC = 0, a 100k ?pull-up resistor between RESET and V CC will hold RESET high when 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 be valid down to V CC = 0.

* Factory-trimmed reset thresholds are available in approximately 100mV increments, with a ±1.8% room-temperature variance.

Table 1. Factory-Trimmed Reset Thresholds*

Figure 1. Interfacing to μPs with Bidirectional Reset Pins

Figure 2. Ensuring Reset Valid Down to V CC = 0

3-Pin, Ultra-Low-Voltage, Low-Power

μP Reset Circuits

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MAX6332/MAX6333/MAX6334

Pin Configuration

Selector Guide (Standard Versions *)

Typical Operating Circuit

* Sample stock is generally held on all standard versions.

M A X 6332/M A X 6333/M A X 6334

3-Pin, Ultra-Low-Voltage, Low-Power μP Reset Circuits 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?2005 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products, Inc.

TRANSISTOR COUNT:505

Chip Information

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 https://www.wendangku.net/doc/789499080.html,/packages .)