Maxim MAX806TMJA, MAX806TCPA, MAX806TCSA, MAX806TEPA, MAX806SCSA Datasheet

...

19-0243; Rev 1; 9/94

3.0V/3.3V Microprocessor Supervisory Circuits

_______________General Description

These microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in µP systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components.

These devices are designed for use in systems powered by 3.0V or 3.3V supplies. See the selector guide in the back of this data sheet for similar devices designed for 5V systems. The suffixes denote different reset threshold voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see

Reset Threshold

section in the

Detailed Description

). All these parts are available in 8-pin DIP and SO packages. Functions offered in this series are as follows:

Active-High Reset

Active-Low Reset

Part

MAX690 MAX704 MAX802 MAX804 MAX805 MAX806

Watchdog Input

✓✓ ✓ ✓✓✓ ✓✓ ✓

✓✓✓

✓✓ ✓ ✓✓ ✓

Threshold Accuracy

Backup-Battery

Manual Reset

Switch

Input

Comparator

Power-Fail

±4% ±4% ±2% ±2% ±4% ±2%

Reset Window

✓

±75mV

✓

±75mV

✓

±2%

✓

±2%

✓

±75mV

✓

±2%

________________________Applications

Battery-Powered Computers and Controllers Embedded Controllers Intelligent Instruments Automotive Systems Critical µP Power Monitoring Portable Equipment

__________________Pin Configuration

TOP VIEW

OUT

MAX690T/S/R

MAX704T/S/R

MAX802T/S/R

GND

MAX804T/S/R MAX805T/S/R

PFI

MAX806T/S/R

( )

ARE FOR MAX804T/S/R, MAX805T/S/R

< > ARE FOR MAX704T/S/R, MAX806T/S/R

DIP/SO

VBATT

RESET (RESET)

WDI

<MR>

PFO



____________________________Features

♦–R—E—S—E—T–and RESET Outputs ♦ Manual Reset Input ♦ Precision Supply-Voltage Monitor ♦ 200ms Reset Time Delay ♦ Watchdog Timer (1.6sec timeout) ♦ Battery-Backup Power Switching—

Battery Can Exceed VCCin Normal Operation

♦ 40µA VCCSupply Current ♦ 1µA Battery Supply Current ♦ Voltage Monitor for Power-Fail or

Low-Battery Warning

♦ Guaranteed –R—E—S—E—T– Assertion to VCC= 1V ♦ 8-Pin DIP and SO Packages

______________Ordering Information

PART** TEMP. RANGE

MAX690_CPA

MAX690_CSA 0°C to +70°C MAX690_C/D 0°C to +70°C Dice* MAX690_EPA -40°C to +85°C MAX690_ESA -40°C to +85°C MAX690_MJA -55°C to +125°C 8 CERDIP

0°C to +70°C

Ordering Information continued on last page.

* Contact factory for dice specifications. ** These parts offer a choice of reset threshold voltage. Select

the letter corresponding to the desired nominal reset threshold voltage (T = 3.075V, S = 2.925V, R = 2.625V) and insert it into the blank to complete the part number.

PIN-PACKAGE

8 Plastic DIP 8 SO

_________Typical Operating Circuits

REGULATED +3.3V OR +3.0V

UNREGULATED 

0.1µF

3.6V

LITHIUM BATTERY

( ) ARE FOR MAX804T/S/R, MAX805T/S/R

See last page for MAX704T/S/R, MAX806T/S/R.

PFI

VBATT

0.1µF

MAX690T/S/R MAX802T/S/R MAX804T/S/R MAX805T/S/R

GND

RESET

(RESET)

PFO

WDI

OUT

0.1µF

RESET NMI

I/O LINE

BUS

CMOS RAM

µP

GND

MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R

________________________________________________________________

Maxim Integrated Products

Call toll free 1-800-998-8800 for free samples or literature.

3.0V/3.3V Microprocessor Supervisory Circuits

ABSOLUTE MAXIMUM RATINGS

Terminal Voltage (with respect to GND)

.........................................................................-0.3V to 6.0V

VBATT....................................................................-0.3V to 6.0V

All Other Inputs ...................-0.3V to the higher of V

Continuous Input Current

..................................................................................100mA

VBATT...............................................................................18mA

or VBATT

GND..................................................................................18mA

Output Current

–R—E—S—E—T–, –P—F—O–

OUT

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.

....................................................................18mA

................................................................................100mA

ELECTRICAL CHARACTERISTICS

(VCC= 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T, VCC= 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S, VCC= 2.72V to

5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; T

Operating Voltage Range,

, VBATT (Note 1)

MAX690_C, MAX704_C, MAX80_ _C MAX690_E/M, MAX704_E/M, MAX80_ _E/M

–M—R– VCCSupply Current (excluding I

OUT

)

SUPPLY

(MAX704_/

MAX806_)

–M—R– VCCSupply Current in BatteryBackup Mode (excluding I

OUT

)

VBATT Supply Current, Any Mode (excluding I

OUT

) (Note 2)

Battery Leakage Current (Note 3)

(MAX704_/

MAX806_)

MAX690_C/E, MAX704_C/E, MAX80_ _C/E

MAX690_M, MAX704_M, MAX80_ _M

MAX690_C/E, MAX704_C/E, MAX80_ _C/E

MAX690_M, MAX704_M, MAX80_ _M

MAX690_C/E, MAX704_C/E, MAX80_ _C/E,

OUT

MAX690_C/E, MAX704_C/E, MAX80_ _C/E

OUT

Output Voltage V

OUT

MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R

MAX690_M, MAX704_M, MAX80_ _M

OUT

MAX690_M, MAX704_M, MAX80_ _M

OUT

= V

= 5mA (Note 4)

= 50mA

= 5mA (Note 4)

= 50mA

= 250µA, VCC> 2.5V (Note 4)

Continuous Power Dissipation (T

Plastic DIP (derate 9.09mW/°C above +70°C) ..............727mW

= +70°C)

SO (derate 5.88mW/°C above +70°C)...........................471mW

CERDIP (derate 8.00mW/°C above +70°C)...................640mW

Operating Temperature Ranges

MAX690_C_ _/MAX704_C_ _/MAX80_ _C_ _........0°C to +70°C

MAX690_E_ _/MAX704_E_ _/MAX80_ _E_ _......-40°C to +85°C

MAX690_M_ _/MAX704_M_ _/MAX80_ _M_ _...-55°C to +125°C

Storage Temperature Range.............................-65°C to +160°C

Lead Temperature (soldering, 10sec).............................+300°C

= T

to T

MIN

; unless otherwise noted. Typical values are at TA= +25°C.)

MAX

CONDITIONS

1.0 5.5

1.1 5.5

MAX690_C/E, MAX704_C/E, MAX80_ _C/E, VCC< 3.6V

MAX690_C/E, MAX704_C/E, MAX80_ _C/E, VCC< 5.5V

MAX690_M, MAX704_M, MAX80_ _M, VCC< 3.6V

MAX690_M, MAX704_M, MAX80_ _M, V

< 5.5V

40 50

50 65

40 55

50 70

VCC= 2.0V, VBATT = 2.3V

0.4 1

0.4 10

0.01 0.5

0.01 5

-V

0.03 0.015

-V

0.3 0.15

-V

0.035 0.015 V

-V

0.35 0.15

-V

0.0015 0.0006

UNITSMIN TYP MAXSYMBOLPARAMETER

µA

µA25 50

µA

2 _______________________________________________________________________________________

3.0V/3.3V Microprocessor Supervisory Circuits

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T, VCC= 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S, VCC= 2.72V to

5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; T

in Battery-Backup Mode

OUT

Battery Switch Threshold, VCCFalling

Battery Switch Threshold, VCCRising (Note 7)

OUT

VBATT - V VBATT > VCC(Note 6)

This value is identical to the reset threshold, VCCrising

MAX690T/704T/805T

MAX802T/804T/806T

MAX690S/704S/805S

Reset Threshold (Note 8)

RST

MAX802S/804S/806S

MAX690R/704R/805R

MAX802R/804R/806S

Reset Timeout Period –P—F—O–, –R—E—S—E—T–

–P—F—O–, –R—E—S—E—T–

Output Voltage

Output Short to

GND Current (Note 4) –P—F—O–, –R—E—S—E—T–

, RESET

Output Voltage

VCC< 3.6V

SOURCE

VCC= 3.3V, VOH= 0V

SINK

MAX690_/704_/802_/806_, VCC= V

MAX804_/805_, VCC= V VBATT = 0V, VCC= 1.0V, I

–P—F—O–, –R—E—S—E—T–

Output Voltage

MAX690_C, MAX704_C, MAX80_ _C

VBATT = 0V, VCC= 1.2V, I MAX690_E/M, MAX704_E/M, MAX80_ _E/M

RESET Output Leakage Current (Note 9)

VBATT = 0V, VCC= V V

RESET

= T

to T

MIN

MAX

CONDITIONS

= 250µA, VBATT = 2.3V

= 1mA, VBATT = 2.3V

> VCC> 1.75V (Note 5)

CC,VSW

= 50µA

= 1.2mA;

RST

MAX804_C,

min;

RST

= 0V, V

MAX805_C MAX804_E/M,

MAX805_E/M

; unless otherwise noted. Typical values are at TA= +25˚C.)

UNITSMIN TYP MAXSYMBOLPARAMETER

VBATT VBATT

- 0.1 - 0.034 VBATT

- 0.14 mV65 25

VCCfalling VCCrising VCCfalling VCCrising VCCfalling VCCrising VCCfalling VCCrising VCCfalling VCCrising VCCfalling VCCrising

3.00 3.075 3.15

3.00 3.085 3.17

3.00 3.075 3.12

3.00 3.085 3.14

2.85 2.925 3.00

2.85 2.935 3.02

2.88 2.925 3.00

2.88 2.935 3.02

2.55 2.625 2.70

2.55 2.635 2.72

2.59 2.625 2.70

2.59 2.635 2.72 ms140 200 280t

- 0.3 - 0.05

µV180 500I

min;

RST

max

= 40µA,

SINK

= 200µA,

0.13 0.3

0.17 0.3

-1 1 µA

-10 10

V2.30 2.40 2.50V V

V0.06 0.3V

MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R

_______________________________________________________________________________________ 3

3.0V/3.3V Microprocessor Supervisory Circuits

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T, VCC= 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S, VCC= 2.72V to

5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; T

SYMBOLPARAMETER UNITS

VCC< 3.6V

PFI Input Threshold

PFI Input Current

PFI Hysteresis, PFI Rising

PFI Input Current

–M—R–

Input Threshold

–M—R–

Pulse Width

–M—R–

to Reset Delay

–M—R–

Pull-Up Current

WDI Input Threshold

PFT

falling

PFI

MAX690_C/E, MAX704_C/E, MAX80_ _C/E MAX690_M, MAX704_M, MAX80_ _M

VCC< 3.6V

PFH

MAX690_C/E, MAX704_C/E, MAX80_ _C/E MAX690_M, MAX704_M, MAX80_ _M

MAX704_/MAX806_ only

MAX704_/MAX806_ only, –M—R–= 0V, VCC= 3V

MAX690_/MAX802_/MAX804_/MAX805_ only

0V< VCC< 5.5V

Watchdog Timeout Period

VCC< 3.6V MAX690_/MAX802_/MAX804_/MAX805_ only

Note 1: VCCsupply current, logic input leakage, watchdog functionality (MAX690_/802_/805_/804_), –M—R–functionality

(MAX704_/806_), PFI functionality, state of –R—E—S—E—T–(MAX690_/704_/802_/806_), and RESET (MAX804_/805_) tested at VBATT = 3.6V, and V

Note 2: Tested at VBATT = 3.6V, V

= 1.9V.

Note 3: Leakage current into the battery is tested under the worst-case conditions at V

= 5.5V. The state of –R—E—S—E—T–or RESET and –P—F—O–is tested at VCC= VCCmin.

= 3.5V and 0V. The battery current will rise to 10µA over a narrow transition window around

VBATT= 1.0V.

Note 4: Guaranteed by design. Note 5: When V

has a small 25mV typical hysteresis to prevent oscillation. For V

MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R

voltage on VBATT.

Note 6: When VBATT > V Note 7: V

V switchover occurs 200ms prior to reset.

> VCC> VBATT, V

> VSW, V

switches from VBATT to VCCwhen VCCrises above the reset threshold, independent of VBATT. Switchover back to

OUT

occurs at the exact voltage that causes –R—E—S—E—T–to go high (on the MAX804_/805_, RESET goes low); however

remains connected to VCCuntil VCCdrops below VBATT. The VCC-to-VBATT comparator

OUT

remains connected to VCCuntil VCCdrops below the battery switch threshold (VSW).

OUT

Note 8: The reset threshold tolerance is wider for V

prevents internal oscillation.

Note 9: The leakage current into or out of the RESET pin is tested with RESET asserted (RESET output high impedance).

= T

to T

MIN

CONDITIONS

MAX802_C/E, MAX804_C/E, MAX806_C/E

MAX690_/MAX704_/MAX805_

; unless otherwise noted. Typical values are at TA= +25˚C.)

MAX

MIN TYP MAX

1.212 1.237 1.262

1.187 1.237 1.287

-25 2 25

-500 2 500

MAX690_C/E, MAX704_C/E, MAX80_ _C/E

MAX690_M, MAX704_M, MAX80_ _M

10 20 10 25

-25 2 25

-500 2 500

0.7 x V

0.3 x V

0.7 x V

0.3 x V

MAX690_C/E, MAX802_C/E, MAX804_C/E, MAX805_C/E

MAX690_M, MAX802_M, MAX804_M, MAX805_M

MAX690/MAX802/MAX804/ MAX805 only

< 1.75V (typ), V

rising than for VCCfalling to accommodate the 10mV typical hysteresis, which

-1 0.01 1

-10 0.01 10

1.12 1.60 2.24

= 5.5V, VBATT = 1.8V and at VCC= 1.5V,

switches to VBATT regardless of the

OUT

ns100 20t ns60 500t µA20 60 350

µAWDI Input Current

sect

ns100 20WDI Pulse Width

4 _______________________________________________________________________________________

+ 8 hidden pages