MAX6867UK20D4L-T Maxim Integrated, MAX6867UK20D4L-T Datasheet

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MAX6867UK20D4L-T

Manufacturer Part Number
MAX6867UK20D4L-T
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6854, MAX6855, MAX6856, MAX6858, MAX6860, MAX6861, MAX6862, MAX6863, MAX6864, MAX6865, MAX6866, MAX6867, MAX6868, MAX6869r
Datasheet

Specifications of MAX6867UK20D4L-T

Number Of Voltages Monitored
1
Monitored Voltage
1.2 V to 5.5 V
Undervoltage Threshold
1.95 V
Overvoltage Threshold
2.05 V
Output Type
Active Low, Push-Pull
Manual Reset
Resettable
Watchdog
Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
1800 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-23
Chip Enable Signals
No
Maximum Power Dissipation
571 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Supply Current (typ)
7 uA
Supply Voltage - Min
1.1 V
The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–
MAX6869 ultra-low-current (170nA, typ) microprocessor
(µP) supervisory circuits combine voltage monitoring,
watchdog timer, and manual reset input functions in a 5-
pin SOT23 package. These devices assert a reset signal
whenever the monitored voltage drops below the factory-
trimmed reset threshold voltage, manual reset is assert-
ed, or the watchdog timer expires. The reset output
remains asserted for a minimum timeout period after V
rises above the reset threshold and manual reset is
deasserted. Factory-trimmed reset threshold voltages
are offered from +1.575V to +4.625V in approximately
100mV increments (see the Threshold Suffix Guide).
Each device is offered with six minimum reset timeout
options, ranging from 10ms to 1200ms.
The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–
MAX6869 are offered in a variety of configurations (see
the Selector Guide). The MAX6854/MAX6855/MAX6856/
MAX6861–MAX6869 provide a manual reset input, MR.
The MAX6864–MAX6869 offer a watchdog timer that
monitors activity at the WDI input to prevent code execu-
tion errors. The MAX6864–MAX6869 offer watchdog
timeout options of 3.3s or 209s (typ). The MAX6861/
MAX6862/MAX6863 feature a pin-selectable reset delay
period of 10ms or 150ms (min). Push-pull active-low,
push-pull active-high, and open-drain active-low reset
outputs are available.
19-3139; Rev 4; 12/05
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.
MANUAL
RESET
Portable/Battery-Powered Equipment
PDAs/Cell Phones
MP3 Players/Pagers
Glucose Monitors/Patient Monitors
V
CC
MR
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
Nanopower µP Supervisory Circuits with
MAX6864
MAX6867
GND
V
CC
General Description
RESET
WDI
Manual Reset and Watchdog Timer
Applications
0.1µF
RESET
I/O
GND
V
µP
CC
CC
♦ Ultra-Low 170nA (typ) Supply Current
♦ Reset Thresholds from +1.575V to +4.625V in
♦ Six Minimum Reset Timeout Period Options from
♦ Manual Reset Option
♦ Watchdog Timer Option
♦ Pin-Selectable 10ms/150ms (min) Reset Timeout
♦ Immune to Short V
♦ Guaranteed Reset Valid to V
♦ Three Reset Output Options:
♦ No External Components
♦ Small 5-Pin SOT23 Package
♦ Pin Compatible to the TPS3836/TPS3837/TPS3838
† Insert reset threshold suffix (see Table 2, Threshold Suffix
Guide) after UK. Insert the number corresponding to the
desired reset timeout period (see Table 4, Reset Timeout
Period) after D.
Note: Sample stock is generally held on standard versions
only (see Table 5, Standard Versions Table). Standard versions
have an order increment of 2500 pieces. Nonstandard versions
have an order increment of 10,000 pieces. Contact factory for
availability of nonstandard versions.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Pin Configurations and Selector Guide appear at end of
data sheet.
Ordering Information continued at end of data sheet.
MAX6854UK_ _D_-T
MAX6855UK_ _D_-T
Approximately 100mV Increments
10ms to 1200ms
Period (MAX6861/MAX6862/MAX6863)
(MAX6861/MAX6862/MAX6863)
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
PART †
Ordering Information
CC
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Transients
CC
= +1.1V
PIN-PACKAGE
5 SOT23-5
5 SOT23-5
Features
1

Related parts for MAX6867UK20D4L-T

MAX6867UK20D4L-T Summary of contents

Page 1

... MAX6867 MR WDI MANUAL RESET GND ________________________________________________________________ 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. ♦ Ultra-Low 170nA (typ) Supply Current ♦ Reset Thresholds from +1.575V to +4.625V in Approximately 100mV Increments ♦ ...

Page 2

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer ABSOLUTE MAXIMUM RATINGS , Open-Drain RESET to GND ..........................-0.3V to +6. MR, Push-Pull RESET, RESET, WDI, CT, I.C............................................-0. Input Current, Output Current (all pins)............................±20mA Continuous Power Dissipation (T = +70°C) A 5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW Stresses beyond those listed under “ ...

Page 3

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer ELECTRICAL CHARACTERISTICS (continued 1.2V to 5.5V -40°C to +85°C, unless otherwise specified. Typical values are PARAMETER SYMBOL RESET Output Voltage CT Input Current CT Input Voltage MANUAL RESET INPUT MR Input Voltage MR Minimum Pulse Width ...

Page 4

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer (V = +2.5V +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE 10 2.23V +85° +25°C 1 -40°C A 0.1 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 V (V) CC NORMALIZED WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 -40 - TEMPERATURE (°C) NORMALIZED RESET THRESHOLD VOLTAGE vs ...

Page 5

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer (V = +2.5V +25°C, unless otherwise noted OUTPUT LOW VOLTAGE vs. SINK CURRENT 0.30 0. 2. 1.8V CC 0.15 0. 3. 1000 2000 3000 4000 5000 I (µA) SINK V TO RESET DELAY CC 1. 1.575V TH 1. 10µs/div ...

Page 6

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer PIN NAME MAX6854/ MAX6855 MAX6856 RESET 1 — — 1 RESET PIN NAME MAX6858/ MAX6860 1, 2 I.C. Internally Connected. For increased noise immunity, connect I.C. to GND. 3 GND Ground Active-Low Open-Drain or Push-Pull Reset Output. RESET transitions from high to low when V drops below the selected reset threshold ...

Page 7

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer PIN NAME MAX6861/ MAX6862 MAX6863 GND RESET 4 — — 4 RESET _______________________________________________________________________________________ MAX6861/MAX6862/MAX6863 Pin Description Reset Timeout Select Input. Connect CT low to select the D1 reset timeout output period (see Tables 1 and 4). Connect CT high (normally V reset timeout period ...

Page 8

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer PIN NAME MAX6864/ MAX6865 MAX6866 RESET 1 — — 1 RESET 8 _______________________________________________________________________________________ MAX6864/MAX6865/MAX6866 Pin Description Active-Low Open-Drain or Push-Pull Reset Output. RESET transitions from high to drops below the selected reset threshold pulled low, or the ...

Page 9

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer PIN NAME MAX6867/ MAX6868 MAX6869 1 1 WDI 2 2 GND RESET 4 — — 4 RESET _______________________________________________________________________________________ MAX6867/MAX6868/MAX6869 Pin Description Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period, the internal watchdog timer expires, and a reset is triggered for the reset timeout period ...

Page 10

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer 10kΩ MR (MAX6854/MAX6855/MAX6856/ MAX6861–MAX6869) WDI (MAX6864–MAX6869) Figure 1. Functional Diagram RESET* MR *RESET IS THE INVERSE OF RESET. Figure 2. RESET Timing Relationship 10 ______________________________________________________________________________________ MAX6854 MAX6855 MAX6856 MAX6858 MAX6860– ...

Page 11

... Detailed Description RESET /RESET Output A µP’s reset input starts the µ known state. The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860– MAX6869 µP supervisory circuits assert a reset to prevent code-execution errors during power-up, power-down, and brownout conditions. The MAX6854/MAX6855/MAX6856/ MAX6858/MAX6860–MAX6869 reset output is guaranteed to be valid for V down to 1 ...

Page 12

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer Transient Immunity In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, the MAX6854/ MAX6855/MAX6856/MAX6858/MAX6860–MAX6869 are relatively immune to short-duration supply transients, or glitches. The Maximum V Transient Duration vs. Reset CC Threshold Overdrive graph in the Typical Operating Characteristics shows this relationship ...

Page 13

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer input at different points in the program, rather than pulsing the watchdog input high-low-high or low-high- low. This technique avoids a stuck loop, in which the watchdog timer would continue to be reset inside the loop, keeping the watchdog from timing out. ...

Page 14

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer Table 4. Reset Timeout Periods RESET TIMEOUT PERIODS TIMEOUT OPTION MIN TYP 150 225 D4 1200 1800 D5 300 450 D6 600 900 Table 5. Standard Versions PART MAX6854UK16D3 MAX6854UK23D3 MAX6854UK26D3 MAX6854UK29D3 MAX6854UK31D3 ...

Page 15

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer TOP VIEW RESET (RESET) MAX6854 GND 2 MAX6855 MAX6856 GND SOT23 ( ) MAX6855 ONLY RESET 1 (RESET) GND MAX6865 ONLY ______________________________________________________________________________________ I. MAX6858 I.C. 2 MAX6860 GND 3 4 RESET SOT23 5 V WDI ...

Page 16

... Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer PART PUSH-PULL ACTIVE LOW √ MAX6854 MAX6855 — MAX6856 — √ MAX6858 MAX6860 — √ MAX6861 MAX6862 — MAX6863 — √ MAX6864 MAX6865 — MAX6866 — √ MAX6867 MAX6868 — MAX6869 — ...

Page 17

... 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 ____________________ 17 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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