MAX807MCWE Maxim Integrated, MAX807MCWE Datasheet

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MAX807MCWE

Manufacturer Part Number
MAX807MCWE
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX807L, MAX807M, MAX807Nr
Datasheet

Specifications of MAX807MCWE

Number Of Voltages Monitored
1
Monitored Voltage
4.425 V
Undervoltage Threshold
4.35 V
Overvoltage Threshold
4.5 V
Output Type
Active High, Active Low
Manual Reset
Resettable
Watchdog
Watchdog
Battery Backup Switching
Backup
Power-up Reset Delay (typ)
280 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Package / Case
SOIC-16 Wide
Chip Enable Signals
Yes
Maximum Power Dissipation
762 mW
Minimum Operating Temperature
0 C
Power Fail Detection
Yes
Supply Current (typ)
70 uA
Supply Voltage - Min
0 V

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The MAX807 microprocessor (µP) supervisory circuit
reduces the complexity and number of components
needed to monitor power-supply and battery-control func-
tions in µP systems. A 70µA supply current makes the
MAX807 ideal for use in portable equipment, while a 2ns
chip-enable propagation delay and 250mA output current
capability (20mA in battery-backup mode) make it suit-
able for larger, higher-performance equipment.
The MAX807 comes in 16-pin DIP, SO, and TSSOP pack-
ages, and provides the following functions:
• µP reset. The active-low RESET output is asserted dur-
• Active-high RESET output.
• Manual-reset input.
• Two-stage power-fail warning. A separate low-line
• Backup-battery switchover for CMOS RAM, real-time
• Write protection of CMOS RAM or EEPROM.
• 2.275V threshold detector provides for power-fail
• BATT OK status flag indicates that the backup-battery
• Watchdog-fault output—asserted if the watchdog input
19-0433; Rev 4; 11/05
Ordering Information and Typical Operating Circuit appear at end of data sheet.
SuperCap is a registered trademark of Baknor Industries. MaxCap is a registered trademark of Cesiwid, Inc.
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.
ing power-up, power-down, and brownout conditions,
and is guaranteed to be in the correct state for V
down to 1V.
comparator compares V
the reset threshold. This low-line comparator is more
accurate than those in previous µP supervisors.
clocks, µPs, or other low-power logic.
warning and low-battery detection, or monitors a
power supply other than +5V.
voltage is above +2.275V.
has not been toggled within a preset timeout period.
Computers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
Portable/Battery-Powered Equipment
Full-Featured µP Supervisory Circuit with
________________________________________________________________ Maxim Integrated Products
General Description
CC
to a threshold 52mV above
Applications
CC
♦ Precision 4.675V (MAX807L), 4.425V (MAX807M),
♦ 200ms Power-OK/Reset Time Delay
♦ RESET and RESET Outputs
♦ Independent Watchdog Timer
♦ 1µA Standby Current
♦ Power Switching
♦ On-Board Gating of Chip-Enable Signals;
♦ MaxCap
♦ Voltage Monitor for Power Fail
♦ Backup-Battery Monitor
♦ Guaranteed RESET Valid to V
♦ ±1.5% Low-Line Threshold Accuracy 52mV above
±1.5% Reset Accuracy
or 4.575V (MAX807N) Voltage Monitoring
2ns CE Gate Propagation Delay
Reset Threshold
TOP VIEW
250mA in V
20mA in Battery-Backup Mode
®
LOW LINE
and SuperCap
RESET
GND
WDI
PFO
V
MR
PFI
CC
CC
Mode
1
2
3
4
5
6
7
8
DIP/SO/TSSOP
MAX807
Pin Configuration
®
Compatible
CC
16
15
14
13
12
11
10
9
= 1V
OUT
CE IN
CE OUT
WDO
RESET
BATT
BATT OK
BATT ON
Features
1

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MAX807MCWE Summary of contents

Page 1

... Ordering Information and Typical Operating Circuit appear at end of data sheet. SuperCap is a registered trademark of Baknor Industries. MaxCap is a registered trademark of Cesiwid, Inc. ________________________________________________________________ Maxim Integrated Products 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. ...

Page 2

Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy ABSOLUTE MAXIMUM RATINGS Input Voltages (with respect to GND) V ..........................................................................-0. .......................................................................-0. BATT All Other Inputs......................................-0. Input Current V Peak ...........................................................................1. Continuous ...

Page 3

Full-Featured µP Supervisory Circuit with ELECTRICAL CHARACTERISTICS (continued 4.60V to 5.5V for the MAX807L 2.8V 0V BATT PFI A MIN PARAMETER SYMBOL BATT ON Output Short-Circuit Current ...

Page 4

Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy ELECTRICAL CHARACTERISTICS (continued 4.60V to 5.5V for the MAX807L 2.8V 0V BATT PFI A MIN MAX PARAMETER SYMBOL PFI ...

Page 5

Full-Featured µP Supervisory Circuit with __________________________________________Typical Operating Characteristics ( 2.8V, PFI = 0, no load BATT V SUPPLY CURRENT vs. TEMPERATURE CC (NORMAL OPERATING MODE ...

Page 6

Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy ( 2.8V, PFI = 0, no load BATT LOW LINE THRESHOLD vs. TEMPERATURE (V RISING) CC 4.80 L VERSION 4.75 4.70 N VERSION 4.65 4.60 4.55 ...

Page 7

Full-Featured µP Supervisory Circuit with PIN NAME 1 PFI Power-Fail Input. When PFI is less than V Power-Fail Output. This CMOS-logic output goes low when PFI is less than V 2 PFO ≥ 4V. PFO swings between ...

Page 8

Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy Detailed Description The MAX807 µP supervisory circuit provides power- supply monitoring, backup-battery switchover, and pro- gram execution watchdog functions in µP systems (Figure 1). Use of BiCMOS technology results in an improved ...

Page 9

Full-Featured µP Supervisory Circuit with V V RST LOW LINE RESET (MAX801 RESET (MAX808 OUT V BATT SHOWN FOR 5V 2.8V, CE ...

Page 10

Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy MR RESET OUT Figure 4. Manual-Reset Timing Diagram WDO remains high if there is a transition or pulse at WDI during the watchdog-timeout period. WDO goes low if ...

Page 11

Full-Featured µP Supervisory Circuit with V CC RESET THRESHOLD OUT 28µs 26µs RESET RESET Figure 7. Reset and Chip-Enable Timing (see the Chip-Enable Propagation Delay vs. CE OUT Load Capacitance graph in the Typical Operating Characteristics). The ...

Page 12

Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy V R1 MAX807 PFI R2 GND PFO – TRIP PFT PFH ...

Page 13

Full-Featured µP Supervisory Circuit with Table 1. Input and Output Status in Battery-Backup Mode PIN NAME 1 PFI The power-fail comparator remains active in battery-backup mode for V 2 PFO The power-fail comparator remains active in battery-backup mode for V ...

Page 14

Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy BATT OK Output The BATT OK comparator monitors the backup battery voltage, comparing it with a 2.265V reference (V 4V). BATT OK remains high as long as the backup bat- tery voltage ...

Page 15

Full-Featured µP Supervisory Circuit with Backup-Battery Replacement The backup battery may be disconnected while V above the reset threshold, provided BATT is bypassed with a 0.1µF capacitor to ground. No precautions are necessary to avoid spurious reset pulses. Negative-Going V ...

Page 16

... 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. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2005 Maxim Integrated Products PART MAX807_CPE 0.1µ ...

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