MAX6366 MAXIM [Maxim Integrated Products], MAX6366 Datasheet

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MAX6366

Manufacturer Part Number
MAX6366
Description
SOT23, Low-Power ?P Supervisory Circuits with Battery Backup and Chip-Enable Gating
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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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 Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
19-1658; Rev 4; 5/09
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
MR
________________________________________________________________ Maxim Integrated Products
1
2
4
3
CC
General Description
MAX6365
SOT23
to backup-battery switching to
Pin Configurations
Portable/Battery-
Powered Equipment
Set-Top Boxes
POS Equipment
7
6
5
8
Applications
CC
CE OUT
BATT
OUT
V
CC
CC
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)Pb)-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
-Denotes a package containing lead(Pb).
T = Tape and reel.
/V Denotes an automotive qualified part.
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 7P K A_ _/V-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
(V
CC
Push-Pull RESET
Open-Drain RESET
Open-Drain RESET
or V
PART*
BATT
)
Ordering Information
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
PIN-PACKAGE
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
Features
CC
or V
BATT
1
)

Related parts for MAX6366

MAX6366 Summary of contents

Page 1

... 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 auxiliary user-adjustable reset input (MAX6368). The MAX6365–MAX6368 operate from V ages as low as 1.2V. The factory preset reset threshold voltages range from 2 ...

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

... RESET Outp ut Leakag ent I MANUAL RESET (MAX6365 only) MR Input Voltage Pullup Resistance Minimum Pulse Width Glitch Immunity MR to Reset Delay WATCHDOG (MAX6366 only) Watchdog Timeout Period t Minimum WDI Input Pulse Width t WDI Input Voltage WDI Input Current BATT ON (MAX6367 only) ...

Page 4

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 IN (MAX6368 only) RESET ...

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

... CHIP-ENABLE PROPAGATION DELAY vs. CE OUT LOAD CAPACITANCE DRIVER SOURCE IMPEDANCE = 50Ω 100 150 C (pF) LOAD MAX6366 WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE BATT - TEMPERATURE (°C) 200 ...

Page 7

... MAX6365 Manual-Reset Input. Maintaining logic low on MR asserts a reset. Reset output remains asserted as long low and for the reset timeout period (t MR from low to high. Leave unconnected, or connect to V pullup to V MAX6366 Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period ( WDI 4 timeout period (t a rising or falling edge (Figure 2) ...

Page 8

... 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 for the MAX6365–MAX6368. OUT powers the static random-access memory (SRAM the reset threshold ( ...

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

... WATCHDOG TIMEOUT PERIOD RESET TIMEOUT PERIOD RP Figure 2. MAX6366 Watchdog Timeout Period and Reset Active Time Watchdog Input (MAX6366 Only) The watchdog monitors µP activity through the watch- dog input (WDI). If the µP becomes inactive, reset asserts. To use the watchdog function, connect WDI to a bus line or µ ...

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

... MAX 4.75 4.50 3.15 3.00 2.70 2.38 PART TOP MARK MAX6366PKA23 AABK MAX6366PKA26 AABJ MAX6366PKA29* AABI MAX6366PKA31 AABH MAX6366PKA44 AABG MAX6366PKA46* AABF MAX6366HKA23 AABQ MAX6366HKA26 AABP MAX6366HKA29 AABO MAX6366HKA31 AABN MAX6366HKA44 AABM MAX6366HKA46* AABL MAX6367LKA23 AABW MAX6367LKA26 AABV MAX6367LKA29* AABU MAX6367LKA31 AABT MAX6367LKA44 AABS MAX6367LKA46* AABR ...

Page 13

... INPUT MAX6365LKA__ MAX6365PKA__ MAX6365HKA__ MAX6366LKA__ MAX6366PKA__ MAX6366HKA__ MAX6367LKA__ MAX6367PKA__ MAX6367HKA__ MAX6368LKA__ MAX6368PKA__ MAX6368HKA__ TOP VIEW RESET, RESET MAX6366 GND 3 6 WDI 4 5 SOT23 ______________________________________________________________________________________ RESET BATT RESET DOG PUSH PULL Pin Configurations (continued) RESET, RESET CE OUT BATT ...

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 PROCESS: CMOS 14 ______________________________________________________________________________________ +2.4V TO +5.5V CMOS RAM 0.1μ OUT BATT 0.1μF MAX6366 MAX6368 RESET WDI** RESET IN OUT ...

Page 15

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating REVISION REVISION NUMBER DATE 4 5/09 Added automotive part number to Ordering Information table Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in ...

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