MAX6368LKA26+ Maxim Integrated Products, MAX6368LKA26+ Datasheet

MAX6368LKA26+

Manufacturer Part Number

MAX6368LKA26+

Description

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

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6368LKA26.pdf (15 pages)

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The MAX6365–MAX6368 supervisory circuits simplify

power-supply monitoring, battery-backup control func-

tions, and memory write protection in microprocessor

(µP) systems. The circuits significantly improve the size,

accuracy, and reliability of modern systems with an ultra-

small integrated solution.

These devices perform four basic system functions:

1) Provide a µP reset output during V

2) Internally control V

3) Provide memory write protection through internal

4) Include one of the following options: a manual reset

The MAX6365–MAX6368 operate from V

ages as low as 1.2V. The factory preset reset threshold

voltages range from 2.32V to 4.63V (see the 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 the Selector

Guide). The MAX6365–MAX6368 are available in minia-

ture 8-pin SOT23 packages.

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.

19-1658; Rev 3; 12/05

Pin Configurations continued at end of data sheet.

up, power-down, and brownout conditions.

maintain data or low-power operation for CMOS

RAM, CMOS µPs, real-time clocks, and other digital

logic when the main supply fails.

chip-enable gating during supply or processor faults.

input (MAX6365), a watchdog timer function

(MAX6366), a battery-on output (MAX6367), or an

auxiliary user-adjustable reset input (MAX6368).

TOP VIEW

Critical µP/µC Power

Monitoring

Fax Machines

Industrial Control

Computers/Controllers

with Battery Backup and Chip-Enable Gating

RESET, RESET

SOT23, Low-Power µP Supervisory Circuits

CE IN

GND

________________________________________________________________ Maxim Integrated Products

General Description

MAX6365

SOT23

to backup-battery switching to

Pin Configurations

Portable/Battery-

Powered Equipment

Set-Top Boxes

POS Equipment

Applications

CE OUT

BATT

OUT

supply power-

supply volt-

♦ Low +1.2V Operating Supply Voltage (V

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

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

♦ 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

♦ RESET/RESET Valid Down to 1.2V Guaranteed

♦ Power-Supply Transient Immunity

♦ 150ms min Reset Timeout Period

♦ Miniature 8-Pin SOT23 Package

*These parts offer a choice of reset threshold voltages. From the

Reset Threshold Ranges table, insert the desired threshold volt-

age 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.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

Typical Operating Circuit appears at end of data sheet.

M A X6 3 6 5 LK A_ _-T

MAX6365PKA_ _-T

MAX6365HKA_ _-T

M A X6 3 6 6 LK A_ _-T

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

M A X 6 36 6H K 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

+2.5V Power-Supply Voltages

Propagation Delay

Push-Pull RESET

Open-Drain RESET

PART*

or V

BATT

)

Ordering Information

-40°C to +85°C

TEMP RANGE

Features

PIN-

8 SOT23-8

PACKAGE

or V

BATT

)

Related parts for MAX6368LKA26+

MAX6368LKA26+ Summary of contents

Page 1

... GND SOT23 Pin Configurations continued at end of data sheet. ________________________________________________________________ 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. ♦ Low +1.2V Operating Supply Voltage (V ♦ Precision Monitoring of +5.0V, +3.3V, +3.0V, and +2.5V Power-Supply Voltages ♦ ...

Page 2

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating ABSOLUTE MAXIMUM RATINGS Terminal Voltages (with respect to GND BATT, OUT.......................................................-0.3V to +6V CC RESET (open drain), RESET (open drain) ................-0.3V to +6V BATT ON, RESET (push-pull), ...

Page 3

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating ELECTRICAL CHARACTERISTICS (continued) = +3.0V +2.4V to +5.5V BATT unless otherwise noted.) (Note 1) PARAMETER SYMBOL Reset Active Timeout Period RESET ...

Page 4

Page 5

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating (T = +25°C, unless otherwise noted OUT ON-RESISTANCE CC vs. TEMPERATURE 1 2.3V 1 25mA OUT 1.0 0.8 0 ...

Page 6

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating (T = +25°C, unless otherwise noted.) A MAX6368 RESET IN THRESHOLD vs. TEMPERATURE 1.236 1.235 1.234 -40 - TEMPERATURE (° ...

Page 7

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating PIN NAME Acti ve Reset Outp ut asser conti nuousl y w hen ...

Page 8

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating 1.235V V CC BATT CE IN 20k MR (MAX6365 ONLY) WDI (MAX6366 ONLY) RESET IN (MAX6368 ONLY) 1.235V Detailed Description The Typical Operating Circuit shows a typical connec- tion ...

Page 9

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating OUT goes high and stays high regardless of any sub- sequent transitions during the reset event. When CE OUT is disconnected from CE IN, CE OUT ...

Page 10

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating WDI RESET t = WATCHDOG TIMEOUT PERIOD RESET TIMEOUT PERIOD RP Figure 2. MAX6366 Watchdog Timeout Period and Reset Active Time Watchdog Input (MAX6366 Only) The ...

Page 11

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating watchdog is set low in the beginning of the program, set high at the beginning of every subroutine or loop, and set low again when the program returns to ...

Page 12

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating Reset Threshold Ranges RESET THRESHOLD RANGES (V) SUFFIX MIN TYP 46 4.50 4.63 44 4.25 4.38 31 3.00 3.08 29 2.85 2.93 26 2.55 2.63 23 2.25 2.32 PART ...

Page 13

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating MANUAL WATCH- PART RESET INPUT MAX6365LKA__ MAX6365PKA__ MAX6365HKA__ MAX6366LKA__ MAX6366PKA__ MAX6366HKA__ MAX6367LKA__ MAX6367PKA__ MAX6367HKA__ MAX6368LKA__ MAX6368PKA__ MAX6368HKA__ TOP VIEW RESET, RESET MAX6366 GND ...

Page 14

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating SECONDARY DC VOLTAGE R1 R2 *RESET IN APPLIES TO MAX6368 ONLY. **WDI APPLIES TO MAX6366 ONLY. Chip Information TRANSISTOR COUNT: 729 PROCESS: CMOS 14 ______________________________________________________________________________________ +2.4V TO +5.5V CMOS ...

Page 15

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2005 Maxim Integrated Products SEE DETAIL " ...

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