19-3384; Rev 1; 9/04
EEPROM-Programmable Hex/Quad
Power-Supply Sequencers/Supervisors with ADC
General Description
The MAX6870/MAX6871 EEPROM-configurable, multi-
voltage supply sequencers/supervisors monitor several
voltage detector inputs, two auxiliary inputs, and four
general-purpose logic inputs. The MAX6870/MAX6871
feature programmable outputs for highly configurable
power-supply sequencing applications. The MAX6870
features six voltage detector inputs and eight program-
mable outputs, while the MAX6871 features four voltage
detector inputs and five programmable outputs. Manual
reset and margin disable inputs offer additional flexibility.
All voltage detectors offer two configurable thresholds
for undervoltage/overvoltage or dual undervoltage
detection. One high voltage input (IN1) provides detec-
tor threshold voltages from +2.5V to +13.2V in 50mV
increments, or from +1.25V to +7.625V in 25mV incre-
ments. A bipolar input (IN2) provides detector threshold
voltages from ±2.5V to ±15.25V in 50mV increments, or
from ±1.25V to ±7.625V in 25mV increments. Positive
inputs (IN3–IN6) provide detector threshold voltages
from +1V to +5.5V in 20mV increments, or from +0.5V
to +3.05V in 10mV increments.
Programmable output stages control power-supply
sequencing or system resets/interrupts. Programmable
output options include: active-high, active-low, open-
drain, weak pullup, push-pull, and charge pump.
Programmable timing delay blocks configure each output
to wait between 25µs and 1600ms before deasserting. A
fault register logs the condition that caused each output
to assert (undervoltage, overvoltage, manual reset, etc.).
An internal 10-bit ADC monitors the voltage detector
inputs, and two auxiliary inputs through a multiplexer
that automatically sequences through all inputs every
200ms. A SMBus
TM
-/I
2
C
T
-compatible, serial data inter-
face programs and communicates with the configuration
EEPROM, the configuration registers, the internal 4kb
user EEPROM, the ADC registers, and the fault registers
of the MAX6870/MAX6871.
The MAX6870/MAX6871 are available in a 7mm x 7mm
x 0.8mm 32-pin thin QFN package and operate over
the extended -40°C to +85°C temperature range.
IT
TION K
VALUA
E
BLE
AVAILA
Features
♦
Six (MAX6870) or Four (MAX6871) Configurable
Input Voltage Detectors
One High Voltage Input (+1.25V to +7.625V or
+2.5V to +13.2V Thresholds)
One Bipolar Voltage Input (±1.25V to ±7.625V
or ±2.5V to ±15.25V Thresholds)
Four (MAX6870) or Two (MAX6871) Positive
Voltage Inputs (+0.5V to +3.05V or +1V to
+5.5V Thresholds)
♦
Four General-Purpose Logic Inputs
♦
Two Configurable Watchdog Timers
♦
Eight (MAX6870) or Five (MAX6871)
Programmable Outputs
Active-High, Active-Low, Open-Drain, Weak
Pullup, Push-Pull, Charge-Pump
Timing Delays from 25µs to 1600ms
♦
10-Bit Internal ADC Monitors the Input Voltage
Detectors and Two Auxiliary Inputs
♦
Margining Disable and Manual Reset Controls
♦
Internal 1.25V Reference or External Reference
Input
♦
4kb Internal User EEPROM
Endurance: 100,000 Erase/Write Cycles
Data Retention: 10 Years
♦
I
2
C/SMBus-Compatible Serial
Configuration/Communication Interface
♦
±1% Threshold Accuracy
MAX6870/MAX6871
Ordering Information
PART
MAX6870ETJ
MAX6871ETJ
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
32 Thin QFN
32 Thin QFN
PKG
CODE
T3277-2
T3277-2
Applications
Telecommunications/Central Office Systems
Networking Systems
Servers/Workstations
Basestations
Storage Equipment
Multimicroprocessor/Voltage Systems
Pin Configurations, Typical Operating Circuit, and Selector
Guide appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
SMBus is a trademark of Intel Corp.
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/Quad
Power-Supply Sequencers/Supervisors with ADC
MAX6870/MAX6871
ABSOLUTE MAXIMUM RATINGS
All Voltages referenced to GND
IN3–IN6, ABP, SDA, SCL, A0, A1,
GPI1–GPI4,
MR, MARGIN,
PO5–PO8
(MAX6870), PO3/PO4/PO5 (MAX6871)............-0.3V to +6V
IN1, PO1–PO4 (MAX6870), PO1/PO2 (MAX6871)....-0.3V to +14V
IN2 ...........................................................................-20V to +20V
DBP, AUXIN1, AUXIN2, REFIN.................................-0.3V to +3V
Input/Output Current (all pins)..........................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
32-Pin 7mm x 7mm Thin QFN
(derate 33.3mW/°C above +70°C) .............................2667mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°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
= +6.5V to +13.2V, V
IN2
= +10V, V
IN3
to V
IN6
= +2.7V to +5.5V, AUXIN_ = GPI_ = GND,
MARGIN
=
MR
= DBP, T
A
= -40°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1 and 2)
PARAMETER
Operating Voltage Range
(Note 3)
SYMBOL
V
IN1
V
IN3
to
V
IN6
V
IN1P
V
UVLO
CONDITIONS
Voltage on IN1 to ensure the device is fully
operational, IN3 to IN6 = GND
Voltage on any one of IN3 to IN6 to ensure
the device is fully operational, IN1 = GND
Minimum voltage on IN1 to guarantee that the
device is powered through IN1
Minimum voltage on one of IN3 to IN6 to
guarantee the device is EEPROM configured.
V
IN1
= +13.2V, IN2 to IN6 = GND, no load
Supply Current
I
CC
Writing to configuration registers or EEPROM,
no load
V
IN1
(50mV increments)
V
IN1
(25mV increments)
Threshold Range
V
TH
V
IN2
(50mV increments)
V
IN2
(25mV increments)
V
IN3
to V
IN6
(20mV increments)
V
IN3
to V
IN6
(10mV increments)
IN1 to IN6 positive,
V
IN_
falling
Threshold Accuracy
-15.25V
≤
V
IN2
≤
-5V,
V
IN2
falling
-5V
≤
V
IN2
≤
0, V
IN2
falling
Threshold Hysteresis
Reset Threshold Temperature
Coefficient
Threshold-Voltage Differential
Nonlinearity
V
TH-HYST
∆V
TH
/°C
V
TH
DNL
-1
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
2.5
1.250
±2.50
±1.250
1.0
0.50
-1.0
-1.5
-1.5
-2
-75
-100
0.3
10
+1
1.2
1.3
MIN
4.0
2.7
TYP
MAX
13.2
V
5.5
6.5
2.5
1.5
2
13.2
7.625
±15.25
±7.625
5.5
3.05
+1.0
+1.5
+1.5
+2
+75
+100
mV
% V
TH
ppm/
°C
LSB
%
V
mA
V
V
UNITS
IN1 Supply Voltage
(Note 3)
Undervoltage Lockout
2
_______________________________________________________________________________________
EEPROM-Programmable Hex/Quad
Power-Supply Sequencers/Supervisors with ADC
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
= +6.5V to +13.2V, V
IN2
= +10V, V
IN3
to V
IN6
= +2.7V to +5.5V, AUXIN_ = GPI_ = GND,
MARGIN
=
MR
= DBP, T
A
= -40°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1 and 2)
PARAMETER
IN1 Input Leakage Current
IN2 Input Impedance
IN3 to IN6 Input Impedance
Power-Up Delay
IN_ to PO_ Delay
SYMBOL
I
LIN1
R
IN2
R
IN3
to
R
IN6
t
PU
t
DPO
V
IN1
> 6.5V
V
ABP
≥
V
UVLO
V
IN_
falling or rising, 100mV overdrive
000
001
010
PO_ Timeout Period
t
RP
Register contents
(Table 25)
011
100
101
110
111
PO1–PO4 (MAX6870), PO1/PO2
(MAX6871) Output Low (Note 3)
PO5–PO8 (MAX6870), PO3/PO4/
PO5 (MAX6871) Output Low (Note 3)
PO1–PO8 Output Initial Pulldown
Current
PO1–PO8 Output Open-Drain
Leakage Current
PO1–PO8 Output Pullup
Resistance, Weak Pullup Selected
PO1–PO4 (MAX6870), PO1/PO2
(MAX6871) Turn-On Time, Charge
Pump Selected (Note 4)
PO1–PO4 (MAX6870), PO1/PO2
(MAX6871) Turn-Off Time, Charge
Pump Selected
PO1–PO4 (MAX6870), PO1/PO2
(MAX6871) Output High,
Charge Pump Selected (Notes 3, 4)
V
OL
V
OL
I
PD
I
LKG
V
ABP
≥
+2.5V, I
SINK
= 500µA
V
ABP
≥
+4.0V, I
SINK
= 2mA
V
ABP
≥
+2.5V, I
SINK
= 1mA
V
ABP
≥
+4.0V, I
SINK
= 4mA
V
ABP
≤
V
UVLO
, V
PO_
= 0.8V
Output high impedance
-1
10
1.406
5.625
22.5
45
180
360
1440
25
25
1.5625
6.25
25
50
200
400
1600
1.719
6.875
27.5
55
220
440
1760
0.3
0.4
0.3
0.4
40
+1
V
V
µA
µA
ms
CONDITIONS
For V
IN1
< the highest of V
IN3
to V
IN6
160
70
MIN
TYP
100
230
100
MAX
140
320
145
3.5
UNITS
µA
kΩ
kΩ
ms
µs
µs
MAX6870/MAX6871
R
PU
V
PO_
= 2V
6.6
10
15.0
kΩ
t
ON
C
PO_
= 1500pF, V
ABP
= +3.3V,
V
PO_
= +7.8V
C
PO_
= 1500pF, V
ABP
= +3.3V,
V
PO_
= +0.5V
With respect to V
ABP
, I
PO_
< 100nA
0.5
1.5
3.0
ms
t
OFF
30
5.5
µs
V
OHCP
With respect to V
ABP
, I
PO_
< 1µA
Any one of V
IN3
to V
IN6
≥
+2.7V, I
SOURCE
=
10mA, output pulled up to the same IN_
4.0
1.5
0.8 x
V
IN_
0.8 x
V
IN_
5.0
6.0
V
PO5–PO8 (MAX6870), PO3/PO4/
PO5 (MAX6871) Output High,
Push-Pull Selected (Note 3)
V
OH
Any one of V
IN3
to V
IN6
≥
+2.7V, I
SOURCE
=
1mA, output pulled up to the same IN_
Any one of V
IN3
to V
IN6
≥
+4.5V, I
SOURCE
=
2mA, output pulled up to the same IN_
V
_______________________________________________________________________________________
3
EEPROM-Programmable Hex/Quad
Power-Supply Sequencers/Supervisors with ADC
MAX6870/MAX6871
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
= +6.5V to +13.2V, V
IN2
= +10V, V
IN3
to V
IN6
= +2.7V to +5.5V, AUXIN_ = GPI_ = GND,
MARGIN
=
MR
= DBP, T
A
= -40°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1 and 2)
PARAMETER
MR, MARGIN,
GPI_ Input Voltage
MR
Input Pulse Width
MR
Glitch Rejection
MR
to PO_ Delay
MR
to V
DBP
Pullup Current
MARGIN
to V
DBP
Pullup Current
GPI_ to PO_ Delay
GPI_ Pulldown Current
Watchdog Input Pulse Width
t
DMR
I
MR
I
MARGIN
t
DGPI_
I
GPI_
t
WDI
V
GPI_
= +0.8V
GPI_ configured as a watchdog input
000
001
010
Watchdog Timeout Period
t
WD
Register Contents
(Table 28)
011
100
101
110
111
Reference Input Voltage Range
Reference Input Resistance
V
REFIN
R
REFIN
V
REFIN
= +1.25V
IN1, LSB = 18.3mV
IN1, LSB = 9.16mV
IN2, LSB = 18.3mV
ADC Range
IN2, LSB = 9.16mV
IN3 to IN6, LSB = 7.32mV
IN3 to IN6, LSB = 3.66mV
AUXIN_, LSB = 1.2mV
ADC Total Unadjusted Error
(Note 5)
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
LAUXIN_
V
IL
V
IH
I
LKG
V
OL
C
I/O
I
SINK
= 3mA
10
2.0
-1
+1
0.4
Internal Reference
IN1 to IN6 positive
IN2 negative
±1.0
±1.0
±1
200
-1
266
+1
0.8
LSB
ms
µA
V
V
µA
V
pF
0
0
0
0
0
0
0
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
13.2
9.366
±15.25
±9.366
5.50
3.746
1.249
±1.0
%FSR
V
6.875
27.5
110
440
1.76
7.04
28.16
112.64
1.275
V
kΩ
s
ms
V
MR
= +1.4V
V
MARGIN
= +1.4V
5
5
SYMBOL
V
IL
V
IH
t
MR
1.4
1
100
2
10
10
200
10
15
15
15
CONDITIONS
MIN
TYP
MAX
0.8
UNITS
V
µs
ns
µs
µA
µA
ns
µA
ns
External Reference, IN1 to IN6 positive (Note 6)
(Note 7)
Monitors all 8 inputs
V
AUXIN_
= 1.25V
SERIAL INTERFACE LOGIC (SDA, SCL, A0, A1)
4
_______________________________________________________________________________________
EEPROM-Programmable Hex/Quad
Power-Supply Sequencers/Supervisors with ADC
TIMING CHARACTERISTICS
(IN1 = GND, V
IN2
= +10V, V
IN3
to V
IN6
= +2.7V to +5.5V, AUXIN_ = GPI_ = GND,
MARGIN
=
MR
= DBP, T
A
= -40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1 and 2)
PARAMETER
TIMING CHARACTERISTICS (Figure 2)
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
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 8)
(Note 8)
(Note 8)
(Note 8)
C
BUS
= 400pF
(Note 9)
(Note 10)
20 +
0.1 x
C
BUS
50
11
1.3
0.6
1.3
0.6
0.6
0.6
100
0
20 +
0.1 x
C
BUS
300
20 +
0.1 x
C
BUS
300
300
900
400
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX6870/MAX6871
Specifications guaranteed for the stated global conditions. The device also meets the parameters specified when 0 < V
IN1
< +6.5V, and at least one of V
IN3
through V
IN6
is between +2.7V and +5.5V, while the remaining V
IN3
through V
IN6
are
between 0 and +5.5V.
Note 2:
Device may be supplied from any one of IN_, except IN2.
Note 3:
The internal supply voltage, measured at ABP, equals the maximum of IN3 to IN6 if V
IN1
= 0, or equals +5.4V if V
IN1
>
+6.5V. For +4V < V
IN1
< +6.5V and V
IN3
through V
IN6
> +2.7V, the input that powers the device cannot be determined.
Note 4:
100% production tested at T
A
= +25°C and T
A
= +125°C. Specifications at T
A
= -40°C are guaranteed by design.
Note 5:
V
IN_
> 0.3 x ADC range.
Note 6:
Does not include the inaccuracy of the external +1.25V voltage reference.
Note 7:
DNL implicitly guaranteed by design in a sigma-delta converter.
Note 8:
C
BUS
= total capacitance of one bus line in pF. Rise and fall times are measured between 0.1 x V
BUS
and 0.9 x V
BUS
.
Note 9:
Input filters on SDA, SCL, A0, and A1 suppress noise spikes < 50ns.
Note 10:
An additional cycle is required when writing to configuration memory for the first time.
Note 1:
_______________________________________________________________________________________
5
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