19-3594; Rev 0; 2/05
KIT
ATION
EVALU
BLE
AVAILA
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
General Description
Features
♦
6 Configurable Input Voltage Detectors
Programmable Thresholds 0.5V to 3.05V
(in 10mV Increments) or 1V to 5.8V (in 20mV
Increments)
Primary UV and Secondary UV/OV Thresholds
♦
One Configurable Watchdog Timer from 6.25ms
to 102.4s
♦
Configurable
RESET, UV/OV,
and
WDO
Outputs
♦
Three Programmable Outputs
Open-Drain or Weak Pullup
RESET, UV/OV,
and
WDO
Active-Low Output Logic
Timing Delays from 25µs to 1600ms
♦
Margining Disable and Manual Reset Controls
♦
Internal 1.25V Reference or External Reference
Input
♦
10-Bit Internal ADC Samples the Input Voltage
Detectors, V
CC
and Auxiliary Input
♦
512-Bit User EEPROM
Endurance: 100,000 Erase/Write Cycles
Data Retention: 10 Years
♦
SMBus/I
2
C-Compatible Serial
Configuration/Communication Interface
♦
±1% Threshold Accuracy
MAX6884/MAX6885
The MAX6884/MAX6885 EEPROM-configurable, multi-
voltage power-supply supervisors monitor six voltage-
detector inputs, one auxiliary input, and one watchdog
input, and feature three programmable outputs for highly
configurable power-supply monitoring applications.
Manual reset and margin disable inputs offer additional
flexibility.
Each voltage-detector input offers a programmable pri-
mary undervoltage and secondary undervoltage/over-
voltage threshold. Voltage-detector inputs IN1–IN6
monitor voltages from 1V to 5.8V in 20mV increments or
0.5V to 3.05V in 10mV increments.
Programmable outputs
RESET, UV/OV,
and
WDO
pro-
vide system resets/interrupts. Programmable output
options include open-drain or weak pullup. Program-
mable timing delay blocks configure each output to
wait between 25µs and 1600ms after their respective
assertion-causing conditions have been cleared. A fault
register logs condition-causing events (undervoltage,
overvoltage, manual reset, etc.).
An internal 10-bit, 1% accurate ADC (MAX6884 only)
converts the voltages at IN1–IN6, AUXIN, and V
CC
through a multiplexer that automatically sequences
through all inputs every 200ms. An SMBus™/I
2
C-com-
patible serial data interface programs and communi-
cates with the configuration EEPROM, configuration
registers, internal 512-bit user EEPROM, and reads the
ADC registers (MAX6884 only) and fault registers.
The MAX6884/MAX6885 are available in a 5mm x 5mm
x 0.8mm 20-pin thin QFN package and operate over
the extended temperature range (-40°C to +85°C).
Ordering Information
PART
MAX6884ETP
MAX6885ETP
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Thin QFN
20 Thin QFN
PKG
CODE
T2055-5
T2055-5
Applications
Telecommunications/Central-Office Systems
Networking Systems
Servers/Workstations
Base Stations
Storage Equipment
Multimicroprocessor/Voltage Systems
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
Selector Guide
PART
MAX6884ETP
MAX6885ETP
VOLTAGE-
DETECTOR INPUTS
6
6
INTERNAL ADC
Yes
No
PROGRAMMABLE
REFERENCE INPUT
OUTPUTS
3
3
Yes
No
AUXILIARY INPUT
Yes
No
________________________________________________________________
Maxim Integrated Products
1
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.
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
MAX6884/MAX6885
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
IN1–IN6, V
CC
,
RESET, UV/OV, WDO........................-0.3V
to +6V
WDI,
MR, MARGIN,
SDA, SCL, A0...........................-0.3V to +6V
AUXIN, DBP, REFIN .................................................-0.3V to +3V
Input/Output Current (all pins)..........................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin (5mm x 5mm) Thin QFN
(derate 21.3mW/°C above +70°C) .............................1702mW
Maximum Junction Temperature .....................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
IN1
–V
IN4
or V
CC
= 2.7V to 5.8V, AUXIN = WDI = GND,
MARGIN
=
MR
= DBP, T
A
= -40°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.) (Notes 1, 2, 3)
PARAMETER
Operating Voltage Range
Undervoltage Lockout
Digital Bypass Voltage
V
UVLO
V
DBP
SYMBOL
CONDITIONS
Voltage on either one of IN1–IN4 or V
CC
to
guarantee the device is fully operational
Minimum voltage on one of IN1–IN4 or V
CC
to guarantee device is EEPROM configured
No load
V
IN1
= 5.8V, IN2–IN6 = GND, no load
Supply Current
I
CC
Writing to configuration registers or
EEPROM, no load
V
IN1
–V
IN6
(in 20mV increments)
Threshold Range
V
TH
V
IN1
–V
IN6
(in 10mV increments)
V
IN1
–V
IN6
(Inputs high impedance;
in 3.3mV increments)
V
IN_
= 2.5V to 5.8V
(20mV increments)
V
IN_
= 1V to 2.5V
(20mV increments)
V
IN_
= 1.25V to 3.05V
(10mV increments)
V
IN_
= 0.5V to 1.25V
(10mV increments)
V
IN_
= 2.5V to 5.8V
(20mV increments)
V
IN_
= 1V to 2.5V
(20mV increments)
V
IN_
= 1.25V to 3.05V
(10mV increments)
V
IN_
= 0.5V to 1.25V
(10mV increments)
1.0
0.50
0.167
-1
-25
-1
-12.5
-1.5
-25
-1.5
-12.5
2.48
2.55
0.9
1.1
MIN
2.7
TYP
MAX
5.8
2.5
2.67
1.2
1.5
5.8
3.05
1.017
+1
+25
+1
+12.5
+1.5
+25
+1.5
+12.5
%
mV
%
mV
%
mV
%
mV
V
UNITS
V
V
V
mA
mA
T
A
= +25°C to
+85°C, (V
IN_
falling)
IN1–IN6 Threshold Accuracy
T
A
= -40°C to
+85°C, (V
IN_
falling)
2
_______________________________________________________________________________________
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
–V
IN4
or V
CC
= 2.7V to 5.8V, AUXIN = WDI = GND,
MARGIN
=
MR
= DBP, T
A
= -40°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.) (Notes 1, 2, 3)
PARAMETER
Threshold Hysteresis
Threshold Tempco
Threshold Differential Nonlinearity
IN_ Input Impedance
IN_ Input Leakage Current
Power-Up Delay
IN_ to
RESET
or
UV/OV
Delay
SYMBOL
V
TH-HYST
∆V
TH
/°C
V
TH
DNL
R
IN
I
IN_LKG
t
D-PO
t
D-R
For V
IN_
< highest of V
IN1–IN4
and
V
IN_
< V
CC
IN_ high impedance
V
CC
≥
V
UVLO
IN_ falling/rising, 100mV overdrive
000
001
010
RESET
and
UV/OV
Timeout
Period (Tables 6 and 7)
t
RP
, t
UP
011
100
101
110
111
RESET, UV/OV, WDO
Output Low
RESET, UV/OV, WDO
Output
Open-Drain Leakage Current
RESET, UV/OV, WDO
Output
Pullup Resistance
MR, MARGIN,
WDI Input Voltage
MR
Input Pulse Width
MR
Glitch Rejection
R
PU
V
IL
V
IH
t
MR
1.4
1
100
I
SINK
= 4mA, output asserted
Output high impedance
V
RESET
, V
UV/OV
, V
WDO
= 2V
-1
6.6
10
1.406
5.625
22.5
45
180
360
1440
20
0.025
1.5625
6.25
25
50
200
400
1600
1.719
6.875
27.5
55
220
440
1760
0.4
+1
15.0
0.6
V
µA
kΩ
V
µs
ns
ms
-1
130
-150
200
CONDITIONS
MIN
TYP
0.3
10
+1
300
+150
2.5
MAX
UNITS
% V
TH
ppm/°C
LSB
kΩ
nA
ms
µs
MAX6884/MAX6885
_______________________________________________________________________________________
3
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
MAX6884/MAX6885
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
–V
IN4
or V
CC
= 2.7V to 5.8V, AUXIN = WDI = GND,
MARGIN
=
MR
= DBP, T
A
= -40°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.) (Notes 1, 2, 3)
PARAMETER
MR
to
RESET
or
UV/OV
Delay
MR
to Internal V
DBP
Pullup
Current
MARGIN
to DBP Pullup Current
WDI Pulldown Current
WDI Input Pulse Width
SYMBOL
t
D-MR
I
MR
I
MARGIN
I
WDI
t
WDI
000
001
010
Watchdog Timeout Period
(Table 8)
t
WD
011
100
101
110
111
Reference Input Voltage Range
Reference Input Resistance
V
REF
R
REF
MAX6884 only
V
REF
= 1.25V, MAX6884 only
IN1–IN6, V
CC
; LSB = 7.32mV, MAX6884 only
ADC Range
ADC
RANGE
IN1–IN6; LSB = 3.66mV, MAX6884 only
AUXIN, IN1–IN6 high-impedance mode;
LSB = 1.2mV, MAX6884 only
Internal reference, MAX6884 only
External reference, MAX6884 only (Note 5)
MAX6884 only (Note 6)
Converts all six IN_ inputs, AUXIN, and
V
CC
, MAX6884 only
V
AUXIN
= 1.25V, MAX6884 only
-1
±1
200
266
+1
0.8
2.0
1
I
SINK
= 3mA
0.4
10
0
0
0
V
MR
= 1.4V
V
MARGIN
= 1.4V
V
WDI
= 0.6V
5
5
5
50
5.625
22.5
90
360
1.44
5.76
23.04
92.16
1.225
6.25
25
100
400
1.60
6.40
25.60
102.40
1.25
500
5.8
3.746
1.25
±1.0
±1.0
%FSR
LSB
ms
µA
V
V
µA
V
pF
V
6.875
27.5
110
440
1.76
7.04
28.16
112.64
1.275
V
kΩ
s
ms
CONDITIONS
MIN
TYP
200
10
10
10
15
15
15
MAX
UNITS
ns
µA
µA
µA
ns
ADC Total Unadjusted Error
(Note 4)
ADC Differential Nonlinearity
ADC Total Monitoring Cycle Time
AUXIN Input Leakage Current
Logic-Input Low Voltage
Logic-Input High Voltage
Input Leakage Current
Output-Voltage Low
Input/Output Capacitance
TUE
DNL
t
C
I
AUXIN
V
IL
V
IH
I
LKG
V
OL
C
I/O
SERIAL INTERFACE LOGIC (SDA, SCL, A0)
4
_______________________________________________________________________________________
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
TIMING CHARACTERISTICS
(V
IN1
–V
IN4
or V
CC
= 2.7V to 5.8V, AUXIN = WDI = GND,
MARGIN
=
MR
= DBP, T
A
= -40°C to +85°C, unless otherwise noted. Typical
values are at T
IN1
= +25°C.) (Notes 1, 2, 3)
PARAMETER
Serial Clock Frequency
Clock Low Period
Clock High Period
Bus Free Time
START Setup Time
START Hold Time
STOP Setup Time
Data In Setup Time
Data In Hold Time
Receive SCL/SDA Minimum Rise
Time
Receive SCL/SDA Maximum Rise
Time
Receive SCL/SDA Minimum Fall
Time
Receive SCL/SDA Maximum Fall
Time
Transmit SDA Fall Time
Pulse Width of Spike Suppressed
EEPROM Byte Write Cycle Time
SYMBOL
f
SCL
t
LOW
t
HIGH
t
BUF
t
SU:STA
t
HD:STA
t
SU:STO
t
SU:DAT
t
HD:DAT
t
R
t
R
t
F
t
F
t
F
t
SP
t
WR
(Note 7)
(Note 7)
(Note 7)
(Note 7)
C
BUS
= 400pF (Note 5)
(Note 8)
(Note 9)
20 +
0.1 x C
BUS
50
11
1.3
0.6
1.3
0.6
0.6
0.6
100
30
20 +
0.1 x C
BUS
300
20 +
0.1 x C
BUS
300
300
900
CONDITIONS
MIN
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
ms
MAX6884/MAX6885
TIMING CHARACTERISTICS (Figure 6)
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
100% production tested at T
A
= +25°C and T
A
= +85°C. Specifications at T
A
= -40°C are guaranteed by design.
Device may be supplied from IN1–IN4 or V
CC
.
The internal supply voltage, measured at V
CC
, equals the maximum of IN1–IN4.
V
IN_
> 0.3 x ADC range.
Does not include the inaccuracy of the 1.25V input reference voltage (MAX6884 only).
DNL is implicitly guaranteed by design in a
Σ∆
converter.
C
BUS
= total capacitance of one bus line in picofarads. Rise and fall times are measured between 0.1 x V
BUS
and 0.9 x
V
BUS
.
Note 8:
Input filters on SDA, SCL, and A0 suppress noise spikes <50ns.
Note 9:
An additional cycle is required when writing to configuration memory for the first time.
_______________________________________________________________________________________
5
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