MAXIM MAX6365, MAX6368 Technical data

General Description

The MAX6365–MAX6368 supervisory circuits simplify
power-supply monitoring, battery-backup control func­tions, and memory write protection in microprocessor
(µP) systems. The circuits significantly improve the size,
accuracy, and reliability of modern systems with an ultra­small integrated solution.

These devices perform four basic system functions:

1) Provide a µP reset output during VCCsupply power­up, power-down, and brownout conditions.

2) Internally control VCCto backup-battery switching to
maintain data or low-power operation for CMOS
RAM, CMOS µPs, real-time clocks, and other digital
logic when the main supply fails.

3) Provide memory write protection through internal
chip-enable gating during supply or processor faults.

4) Include one of the following options: a manual reset
input (MAX6365), a watchdog timer function
(MAX6366), a battery-on output (MAX6367), or an
auxiliary user-adjustable reset input (MAX6368).

The MAX6365–MAX6368 operate from VCCsupply volt­ages as low as 1.2V. The factory preset reset threshold
voltages range from 2.32V to 4.63V (see Ordering
Information). In addition, each part is offered in three
reset output versions: push-pull active low, open-drain
active low, or open-drain active high (see Selector
Guide). The MAX6365–MAX6368 are available in minia­ture 8-pin SOT23 packages.

Applications

Critical µP/µC Power Portable/Battery­Monitoring Powered Equipment

Fax Machines Set-Top Boxes

Industrial Control POS Equipment

Computers/Controllers

Features

♦ Low +1.2V Operating Supply Voltage (VCCor V

BATT

)

♦ Precision Monitoring of +5.0V, +3.3V, +3.0V, and

+2.5V Power-Supply Voltages

♦ On-Board Gating of Chip-Enable Signals, 1.5ns

Propagation Delay

♦ Debounced Manual Reset Input (MAX6365)
♦ Watchdog Timer, 1.6s Timeout (MAX6366)
♦ Battery-On Output Indicator (MAX6367)
♦ Auxiliary User-Adjustable RESET IN (MAX6368)
♦ Low 10µA Quiescent Supply Current
♦ Three Available Output Structures

Push-Pull RESET
Open-Drain RESET
Open-Drain RESET

♦ RESET/RESET Valid Down to 1.2V Guaranteed

(V

CC

or V

BATT

)

♦ Power-Supply Transient Immunity
♦ 150ms min Reset Timeout Period
♦ Miniature 8-Pin SOT23 Package

MAX6365–MAX6368

SOT23, Low-Power µP Supervisory Circuits

with Battery Backup and Chip-Enable Gating

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

19-1658; Rev 1; 6/01

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.

Ordering Information

*These parts offer a choice of reset threshold voltages. From the
Reset Threshold Ranges table, insert the desired threshold volt­age code in the blank to complete the part number. SOT parts
come in tape-and-reel only and must be ordered in 2500-piece
increments. See Device Marking Codes for a complete parts list,
including SOT top marks and standard threshold versions. See
Selector Guide for a listing of device features.

Pin Configurations continued at end of data sheet.

Typical Operating Circuit appears at end of data sheet.

PART* TEMP. RANGE

PIN­PACKAGE

-40°C to +85°C 8 SOT23-8

MAX6365PKA_ _-T -40°C to +85°C 8 SOT23-8

-40°C to +85°C 8 SOT23-8

-40°C to +85°C 8 SOT23-8

M A X 6 36 6P K A_ _-T

-40°C to +85°C 8 SOT23-8

M A X 6 36 6H K A_ _-T

-40°C to +85°C 8 SOT23-8

-40°C to +85°C 8 SOT23-8

-40°C to +85°C 8 SOT23-8

-40°C to +85°C 8 SOT23-8

-40°C to +85°C 8 SOT23-8

-40°C to +85°C 8 SOT23-8

-40°C to +85°C 8 SOT23-8

查询MAX6365供应商

TOP VIEW

RESET, RESET

1

2

GND

3

4

MR

87CE OUT

MAX6365

SOT23

6

5

BATTCE IN

OUT

V

M A X6 3 6 5 LK A_ _-T

MAX6365HKA_ _-T

M A X6 3 6 6 LK A_ _-T

M A X6 3 6 7 LK A_ _-T

M A X 6 36 7P K A_ _-T

M A X 6 36 7H K A_ _-T

M A X6 3 6 8 LK A_ _-T

M A X 6 36 8P K A_ _-T

M A X 6 36 8H K A_ _-T

CC

MAX6365–MAX6368

SOT23, Low-Power µP Supervisory Circuits
with Battery Backup and Chip-Enable Gating

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +2.4V to +5.5V, V

BATT

= +3.0V, CE IN = VCC, reset not asserted, TA= -40°C to +85°C. Typical values are at TA= +25°C,

unless otherwise noted.) (Note 1)

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 Voltages (with respect to GND)
V

CC

, BATT, OUT.......................................................-0.3V to +6V

RESET (open drain), RESET (open drain) ................-0.3V to +6V

BATT ON, RESET (push-pull), RESET IN,

WDI, CE IN, CE OUT ...........................-0.3V to (V

OUT

+ 0.3V)

MR ..............................................................-0.3V to (V

CC

+ 0.3V)

Input Current

V

CC

Peak ..............................................................................1A

V

CC

Continuous .............................................................250mA

BATT Peak .....................................................................250mA

BATT Continuous .............................................................40mA

GND ...............................................................................75mA

Output Current

OUT ...............................Short-Circuit Protected for up to 10s

RESET, RESET, BATT ON, CE OUT...............................20mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SOT23 (derate 8.75mW/°C above +70°C)........700mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature .....................................................+150°C

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

PARAMETER

CONDITIONS

UNITS

Operating Voltage Range
(Note 2)

No load 0 5.5 V

VCC = 2.8V 10 30

VCC = 3.6V 12 35

Supply Current
(Excluding I

OUT

)

I

CC

VCC = 5.5V 15 50

µA

T

A

= +25°C1

Supply Current in Battery-

Backup Mode (Excluding I

OUT

)

I

BACK

V

BATT

= 2.8V,

V

CC

= 0

T

A

= -40°C to +85°C3

µA

T

A

= +25°C

BATT Standby Current I

BATT

+ 0.2V)

T

A

= -40°C to +85°C

µA

VCC = 4.75V, I

OUT

= 150mA 3.1

VCC = 3.15V, I

OUT

= 65mA 3.7VCC to OUT On-Resistance R

ON

VCC = 2.38V, I

OUT

= 25mA 4.6

Ω

V

BATT

= 4.5V, I

OUT

= 20mA

V

BATT

-

V

BATT

= 3.0V, I

OUT

= 10mA

V

BATT

-

Output Voltage in Battery­Backup Mode

V

OUT

V

BATT

= 2.25V, I

OUT

= 5mA

V

BATT

-

V

Power-up 20

Battery-Switchover Threshold

(VCC - V

BATT

)

V

SW

VCC < V

TH

Power-down -20

mV

MAX636_ _KA46

MAX636_ _KA44

MAX636_ _KA31

MAX636_ _KA29

MAX636_ _KA26

Reset Threshold V

TH

MAX636_ _KA23

V

VCC Falling Reset Delay t

RD

V

CC

falling at 10V /ms 20 µs

SYMBOL

MIN TYP MAX

VCC, V

BATT

No load, VCC > V

TH

5.5V > VCC > (V

BATT

-0.1 0.02

-1.0 0.02

0.2

0.15

0.15

4.50 4.63 4.75

4.25 4.38 4.50

3.00 3.08 3.15

2.85 2.93 3.00

2.55 2.63 2.70

2.25 2.32 2.38

MAX6365–MAX6368

SOT23, Low-Power µP Supervisory Circuits

with Battery Backup and Chip-Enable Gating

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.4V to +5.5V, V

BATT

= +3.0V, CE IN = VCC, reset not asserted, TA= -40°C to +85°C. Typical values are at TA= +25°C,

unless otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Reset Active Timeout Period t

RESET Output Voltage

RESET Output Voltage

RESET Outp ut Leakag e C ur r ent I

RP

V

OL

V

OH

V

OL

Reset asserted,

= 0

V

BATT

Reset not asserted
(MAX636_L only)

Reset not asserted

Reset not asserted,
V

= 0

V

OH

BATT

(MAX636_H only)
(Note 3)

LKG

MAX636_P and MAX636_H only 1 µA

I

= 1.6mA,

SINK

> 2.1V

V

CC

I

= 100µA,

SINK

> 1.2V

V

CC

I

SOURCE

V

> V

CC

I

= 1.6mA,

SINK

V

> V

CC

I

SOURCE

V

> 1.8V

CC

I

SOURCE

> 1.2V

V

CC

= 500µA,

TH(MAX)

TH (MAX)

= 1mA,

= 200µA,

150 280 ms

0.3

0.4

✕

0.8
V

CC

0.3

✕

0.7
V

CC

✕

0.8
V

CC

V

V

MANUAL RESET (MAX6365 only)

✕

0.3
V

CC

V

MR Input Voltage

V

IL

✕

V

IH

0.7
V

CC

Pullup Resistance 20 kΩ

Minimum Pulse Width 1µs

Glitch Immunity VCC = 3.3V 100 ns
MR to Reset Delay VCC = 3.3V 120 ns

WATCHDOG (MAX6366 only)

Watchdog Timeout Period t

Minimum WDI Input Pulse Width t

WDI Input Voltage

WD

WDI

V

V

IH

IL

1.00 1.65 2.25 s

100 ns

✕

0.3
V

CC

✕

0.7
V

CC

V

WDI Input Current -1.0 1.0 µA

BATT ON (MAX6367 only)

Output Voltage V

OL

I

SINK

= 3.2mA, V

= 2.1V 0.4 V

BATT

Sink current, VCC = 5V 60 mA

Output Short-Circuit Current

Source current, V

> 2V 10 30 100 µA

BATT

MAX6365–MAX6368

SOT23, Low-Power µP Supervisory Circuits
with Battery Backup and Chip-Enable Gating

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

8

10

9

12

11

15

14

13

16

-40 0-20 20 40 60 80

SUPPLY CURRENT

vs. TEMPERATURE (NO LOAD)

MAX6365/8-01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

VCC = 5.0V
V

BATT

= 0

0

0.2

0.6

0.4

0.8

1.0

1.2

BATTERY SUPPLY CURRENT

(BACKUP MODE) vs. TEMPERATURE

MAX6365/8-02

TEMPERATURE (°C)

BATTERY SUPPLY CURRENT (µA)

-40 20 40-20 0 60 80

V

BATT

= 2.0V

VCC = 0

V

BATT

= 2.8V

0

2

1

4

3

7

6

5

8

-40 0-20 20 40 60 80

BATT-TO-OUT ON-RESISTANCE

vs. TEMPERATURE

MAX6365/8-03

TEMPERATURE (°C)

BATT-TO-OUT ON-RESISTANCE (Ω)

V

BATT

= 5.0V

V

BATT

= 2.0V

V

BATT

= 2.8V

I

OUT

= 25mA

V

CC

= 0

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.4V to +5.5V, V

BATT

= +3.0V, CE IN = VCC, reset not asserted, TA= -40°C to +85°C. Typical values are at TA= +25°C,

unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

RESET IN (MAX6368 only)

RESET IN Threshold V

RTH

V

RESET IN Leakage Current

nA

RESET IN to Reset Delay VOD = 50mV, RESET IN falling 1.5 µs

CHIP-ENABLE GATING

CE IN Leakage Current Reset asserted

µA

CE IN to CE OUT Resistance

Reset not asserted (Note 4) 20

Ω

CE OUT Short-Circuit Current Reset asserted, CE OUT = 0

mA

VCC = 4.75V 1.5 7

CE IN to CE OUT Propagation

Delay

50Ω source,
C

LOAD

= 50pF

V

CC

= 3.15V 2 9

ns

VCC = 5V, VCC

>

V

BATT

, I

SOURCE

= 100µA

CE OUT Output Voltage High

V

CC

= 0, V

BATT

>

2.2V, I

SOURCE

= 1µA

V

BATT

-

0.1

V

Reset-to-CE OUT Delay 12 µs

Note 1: All devices are 100% production tested at TA= +25°C. Limits over temperature are guaranteed by design.
Note 2: V

BATT

can be 0 anytime, or VCCcan go down to 0 if V

BATT

is active (except at startup).

Note 3: RESET is pulled up to OUT. Specifications apply for OUT = V

CC

or OUT = BATT.

Note 4: The chip-enable resistance is tested with V

CC

= V

TH(MAX)

and CE IN = VCC/2.

1.185 1.235 1.285

±0.01 ±25

0.75 2.0

0.8 ✕ V

CC

±1

100

MAX6365–MAX6368

SOT23, Low-Power µP Supervisory Circuits

with Battery Backup and Chip-Enable Gating

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

0

0.4

0.2

0.8

0.6

1.2

1.0

1.4

-40 0 20-20 40 60 80

VCC TO OUT ON-RESISTANCE

vs. TEMPERATURE

MAX6365/8-04

TEMPERATURE (°C)

V

CC

TO OUT ON-RESISTANCE (Ω)

VCC = 3.0V
I

OUT

= 65mA

VCC = 4.5V
I

OUT

= 150mA

VCC = 2.3V
I

OUT

= 25mA

190

195

205

200

210

RESET TIMEOUT PERIOD

vs. TEMPERATURE

MAX6365/8-05

TEMPERATURE (°C)

RESET TIMEOUT PERIOD (ms)

-40 20 40-20 0 60 80

0

30

15

75

60

45

135

120

105

90

MAX6365/8-06

TEMPERATURE (°C)

PROPAGATION DELAY (µs)

-40 20 40-20 0 60 80

VCC TO RESET PROPAGATION DELAY

vs. TEMPERATURE

VCC FALLING

0.25V/ms

1V/ms

10V/ms

2.0

3.0

2.5

5.0

4.5

4.0

3.5

RESET THRESHOLD
vs. TEMPERATURE

MAX6365/8-07

TEMPERATURE (°C)

THRESHOLD (V)

-40 20 40-20 0 60 80

MAX636_ 46 (VTH = 4.63V)

MAX636_ 26 (VTH = 2.63V)

1 10010 1000 10,000

MAXIMUM TRANSIENT DURATION

vs. RESET THRESHOLD OVERDRIVE

MAX6365/8-08

RESET THRESHOLD OVERDRIVE V

TH

- VCC (mV)

MAXIMUM TRANSIENT DURATION (µs)

400

300

350

250

200

0

50

150

100

MAX636_ 26
(V

TH

= 2.63V)

MAX636_ 46
(V

TH

= 4.63V)

RESET OCCURS
ABOVE CURVE

0

3

2

1

5

4

9

8

7

6

10

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5

BATTERY SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX6365/8-09

VCC (V)

BATTERY SUPPLY CURRENT (µA)

VTH = 2.93V

V

BATT

= 2.8V

V

BATT

= 2.5V

V

BATT

= 2.3V