MAX6887RETE Maxim Integrated, MAX6887RETE Datasheet

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MAX6887RETE

Manufacturer Part Number
MAX6887RETE
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6887, MAX6888r
Datasheet

Specifications of MAX6887RETE

Number Of Voltages Monitored
6
Undervoltage Threshold
0.527 V, 0.527 V, 0.527 V, 0.527 V, 0.527 V, 0.527 V
Overvoltage Threshold
0.673 V, 0.673 V, 0.673 V, 0.673 V, 0.673 V, 0.673 V
Manual Reset
Resettable
Watchdog
Watchdog
Supply Voltage - Max
5.8 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
TQFN-16
Maximum Power Dissipation
1667 mW
Minimum Operating Temperature
- 40 C
Supply Current (typ)
900 uA
Supply Voltage - Min
2.7 V
The MAX6887/MAX6888 multivoltage supply supervi-
sors provide several voltage-detector inputs, one watch-
dog input, and three outputs. Each voltage-detector
input offers a factory-set undervoltage and overvoltage
threshold. Manual reset and margin disable inputs offer
additional flexibility.
The MAX6887 offers six voltage-detector inputs, while
the MAX6888 offers four inputs. Output RESET asserts
when any input voltage drops below its respective
undervoltage threshold or manual reset MR is asserted.
Output OV asserts when any input voltage exceeds its
respective overvoltage threshold. Monitor standard
supply voltages listed in the Selector Guide .
The MAX6887/MAX6888 offer a watchdog timer with an
initial and normal timeout periods of 102.4s and 1.6s,
respectively. Watchdog output WDO asserts when the
watchdog timer expires. Connect WDO to manual reset
input MR to generate resets when the watchdog timer
expires. RESET, OV, and WDO are active-low, open-
drain outputs.
The MAX6887/MAX6888 are available in a 5mm x 5mm
x 0.8mm, 16-pin thin QFN package and operate over
the extended -40°C to +85°C temperature range.
19-0291; Rev 2; 2/10
* See thresholds options tables (Tables 1 and 2) for actual undervoltage and overvoltage thresholds.
Selector Guides continued at end of data sheet.
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.
MAX6887AETE 5.0
MAX6887BETE 5.0
MAX6887CETE 5.0
MAX6887DETE 3.3
MAX6887EETE
MAX6887FETE
MAX6887GETE 3.3
MAX6887HETE 3.3
MAX6887QETE Adj
Multivoltage Systems
Telecom
Networking
Servers/Workstations/Storage Systems
PART
Hex/Quad, Power-Supply Supervisory Circuits
3.3
3.3
IN1
NOMINAL INPUT VOLTAGE (V)*
________________________________________________________________ Maxim Integrated Products
IN2
Adj
3.3
3.3
3.3
2.5
2.5
2.5
2.5
1.8
General Description
IN3
Adj
Adj
Adj
2.5
2.5
1.8
1.8
1.8
1.5
IN4
Adj
Adj
Adj
Adj
Adj
Adj
Adj
1.8
1.5
Applications
IN5
Adj
Adj
Adj
Adj
Adj
Adj
Adj
Adj
Adj
IN6
Adj
Adj
Adj
Adj
Adj
Adj
Adj
Adj
Adj
TOL
(%)
5
5
5
5
5
5
5
5
5
o Hex/Quad Voltage Detectors
o Undervoltage and Overvoltage Thresholds
o 1% Threshold Accuracy
o Margining Disable and Manual Reset Input
o Watchdog Timer
o Open-Drain RESET, OV, and WDO Outputs
o 180ms (min) Reset Timeout Period
o Few External Components
o Small 5mm x 5mm, 16-Pin Thin QFN Packages
Note: Insert the desired letter from the Selector Guide into the
blank to complete the part number.
+Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
MAX6887IETE
MAX6887JETE
MAX6887KETE 5.0
MAX6887LETE
MAX6887METE 3.3
MAX6887NETE 3.3
MAX6887OETE 3.3
MAX6887PETE
MAX6887RETE
MAX6887_ETE+
MAX6888_ETE+
PART
PART
5.0
5.0
3.3
3.3
IN1
Adj
NOMINAL INPUT VOLTAGE (V)*
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
IN2
Adj
3.3
3.3
3.3
2.5
2.5
2.5
2.5
1.8
Ordering Information
IN3
Adj
Adj
Adj
2.5
2.5
1.8
1.8
1.8
1.5
Selector Guide
IN4
Adj
Adj
Adj
Adj
Adj
Adj
Adj
1.8
1.5
16 Thin QFN-EP*
16 Thin QFN-EP*
PIN-PACKAGE
IN5
Adj
Adj
Adj
Adj
Adj
Adj
Adj
Adj
Adj
Features
IN6
Adj
Adj
Adj
Adj
Adj
Adj
Adj
Adj
Adj
TOL
(%)
10
10
10
10
10
10
10
10
10
1

Related parts for MAX6887RETE

MAX6887RETE Summary of contents

Page 1

... MAX6887METE 3.3 Adj Adj 5 MAX6887NETE 3.3 Adj Adj 5 MAX6887OETE 3.3 Adj Adj 5 MAX6887PETE Adj Adj 5 MAX6887RETE Features Ordering Information TEMP RANGE PIN-PACKAGE -40°C to +85°C 16 Thin QFN-EP* -40°C to +85°C 16 Thin QFN-EP* Selector Guide NOMINAL INPUT VOLTAGE (V)* TOL IN1 IN2 IN3 IN4 IN5 IN6 5 ...

Page 2

... Hex/Quad, Power-Supply Supervisory Circuits ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) , RESET, OV, WDO .............................-0.3V to +6V IN1–IN6 WDI, MR, MARGIN ...................................................-0.3V to +6V BP .............................................................................-0.3V to +3V Input/Output Current (all pins)..........................................±20mA Continuous Power Dissipation (T = +70°C) A 16-Pin 5mm x 5mm Thin QFN (derate 20.8mW/°C above +70°C) ..............................1667mW Stresses beyond those listed under “ ...

Page 3

... Hex/Quad, Power-Supply Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued) = 2.7V to 5.8V, WDI = GND, MARGIN = – IN1 IN4 +25°C.) (Notes PARAMETER SYMBOL MR, MARGIN, WDI Input Voltage MR Input Pulse Width MR Glitch Rejection MR to RESET or OV Delay MR to Internal BP Pullup Current MARGIN to Internal BP Pullup ...

Page 4

... Hex/Quad, Power-Supply Supervisory Circuits = 5V, WDI = GND, MARGIN = – IN1 IN4 CC IN_ TO RESET OR OV PROPAGATION DELAY vs. TEMPERATURE 30 100mV OVERDRIVE -40 - TEMPERATURE (°C) MAXIMUM IN_ TRANSIENT vs. IN_THRESHOLD OVERDRIVE 200 175 150 125 100 PO_ ASSERTION OCCURS ...

Page 5

... Hex/Quad, Power-Supply Supervisory Circuits PIN NAME MAX6887 MAX6888 Manual Reset Input. Pull MR low to assert RESET. Connect MR to WDO to generate resets MR when the watchdog timer expires. Leave MR unconnected or connect to DBP if unused internally pulled through a 10µA current source. Margin Input. When MARGIN is pulled low, RESET is held in its existing state independent of subsequent changes in monitored input voltages or the watchdog timer expiration ...

Page 6

... Hex/Quad, Power-Supply Supervisory Circuits IN1 IN2 IN2 DETECTOR IN3 DETECTOR IN3 IN4 DETECTOR IN4 IN5 IN5 DETECTOR (N.C.) IN6 IN6 DETECTOR (N.C REFERENCE 1µF 2.55V LDO BP 1µF *FOR ADJUSTABLE INPUTS REFER TO THE ADJUSTABLE THRESHOLD INPUTS SECTION. 6 _______________________________________________________________________________________ *IN_ DETECTOR RESET TIMING BLOCK ...

Page 7

... Hex/Quad, Power-Supply Supervisory Circuits Detailed Description The MAX6887/MAX6888 provide several supply-detector inputs, one watchdog input, and three outputs for power- supply monitoring applications. The MAX6887 offers six voltage-detector inputs, while the MAX6888 offers four. Each voltage-detector input offers both an undervoltage and overvoltage threshold. ...

Page 8

... MAX6887METE 2.880 2.190 MAX6887NETE 2.880 2.190 MAX6887OETE 2.880 2.190 MAX6887PETE 2.880 1.580 MAX6887RETE 0.527 0.527 8 _______________________________________________________________________________________ V REFUV age thresholds listed in Tables 1 and 2 that allow adjustable thresholds. Their values are based on toler- ⎞ ances of ±7.5% and ±12.5% from a 0.6V reference. 2 ⎟ See the Selector Guide to find which thresholds in + ⎠ ...

Page 9

... Hex/Quad, Power-Supply Supervisory Circuits Table 2. MAX6888 Threshold Options PART IN1 MAX6888AETE 4.620 MAX6888BETE 4.620 MAX6888CETE 4.620 MAX6888DETE 3.060 MAX6888EETE 3.060 MAX6888FETE 3.060 MAX6888GETE 3.060 MAX6888HETE 3.060 MAX6888QETE 0.557 MAX6888IETE 4.380 MAX6888JETE 4.380 MAX6888KETE 4.380 MAX6888LETE 2.880 MAX6888METE 2.880 MAX6888NETE 2.880 MAX6888OETE 2 ...

Page 10

... Hex/Quad, Power-Supply Supervisory Circuits OVERVOLTAGE THRESHOLD V IN PRIMARY THRESHOLD OV RESET Figure 2. Output Timing Diagram 2. IN1–IN4 CC WDO RESET WDI D-PO RP WDI WDO NOT CONNECTED THE INITIAL WATCHDOG TIMER PERIOD WDI Figure 3. Watchdog, Reset, and Power-Up Timing Diagram ...

Page 11

... Hex/Quad, Power-Supply Supervisory Circuits At power-up, WDO goes high after t The initial watchdog timeout period (t diately after WDO is high. The initial watchdog timeout period allows the µP to perform its initialization process. A normal watchdog timeout period (t ever WDI transitions from high to low after the initial watchdog timeout period occurs. WDI monitors the tog- gling output of the µ ...

Page 12

... Hex/Quad, Power-Supply Supervisory Circuits TOP VIEW IN4 13 14 IN3 MAX6887 15 IN2 16 IN1 *EXPOSED PAD 1 2 THIN QFN *EXPOSED PAD CONNECTED TO GND. 12V DC-DC 1 DC-DC 2 DC-DC 3 IN1 IN2 MARGIN 12 ______________________________________________________________________________________ 9 8 I.C. 7 WDI 6 MARGIN DC-DC 4 1.5V IN3 IN4 IN5* IN6* OV WDO RESET MAX6887 ...

Page 13

... 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 ____________________ 13 © 2010 Maxim Integrated Products ...

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