19-3438; Rev 0; 10/04
IT
TION K
VALUA
E
BLE
AVAILA
EEPROM-Programmable, Hex/Quad,
Power-Supply Sequencers/Supervisors
General Description
Features
♦
Six (MAX6874) or Four (MAX6875) Configurable
Input Voltage Detectors
One High Voltage Input (+1.25V to +7.625V or
+2.5V to +13.2V Thresholds)
One Voltage Input (+1.25V to +3.05V or
+2.5V to +5.5V)
Four (MAX6874) or Two (MAX6875) Positive
Voltage Inputs (+0.5V to +3.05V or +1V
to +5.5V)
♦
Four (MAX6874) or Three (MAX6875) General-
Purpose Logic Inputs
♦
Two Configurable Watchdog Timers
♦
Eight (MAX6874) or Five (MAX6875) Programmable
Open-Drain Outputs
Active-High or Active-Low
Timing Delays from 25µs to 1600ms
♦
Margining Disable and Manual Reset Controls
♦
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
MAX6874/MAX6875
The MAX6874/MAX6875 EEPROM-configurable, multi-
voltage supply sequencers/supervisors monitor several
voltage detector inputs and general-purpose logic
inputs, and provide programmable open-drain outputs
for highly configurable power-supply sequencing appli-
cations. The MAX6874 provides six voltage monitor
inputs, four general-purpose inputs, and eight program-
mable open-drain outputs. The MAX6875 provides four
voltage monitor inputs, three general-purpose inputs,
and five programmable open-drain outputs. Manual reset
and margin disable inputs provide additional flexibility.
All voltage detectors offer configurable thresholds for
undervoltage detection. One high-voltage input (IN1)
provides detector threshold voltages from +2.5V to
+13.2V in 50mV increments, or from +1.25V to +7.625V
in 25mV increments. A second positive input (IN2) pro-
vides detector threshold voltages from +2.5V to +5.5V
in 50mV increments, or from +1.25V to +3.05V in 25mV
increments. Positive inputs (IN3–IN6) provide detector
threshold voltages from +1V to +5.5V in 20mV incre-
ments, or from +0.5V to +3.05V in 10mV increments.
Programmable output stages control power-supply
sequencing or system resets/interrupts. Program the
open-drain outputs as active-high or active-low.
Programmable timing delay blocks configure each output
to wait between 25µs and 1600ms before deasserting.
An SMBus™/I
2
C-compatible serial data interface pro-
grams and communicates with the configuration EEP-
ROM, the configuration registers, and the internal 4kb
user EEPROM of the MAX6874/MAX6875.
The MAX6874/MAX6875 are available in a 7mm x 7mm
x 0.8mm 32-pin thin QFN package and operate over
the extended temperature range (-40°C to +85°C).
Ordering Information
PART
MAX6874
ETJ
MAX6875
ETJ
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
Base Stations
Storage Equipment
Multimicroprocessor/Voltage Systems
SMBus is a trademark of Intel Corp.
Pin Configurations, Typical Operating Circuit, and Selector
Guide appear at end of data sheet.
________________________________________________________________
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/Quad,
Power-Supply Sequencers/Supervisors
MAX6874/MAX6875
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND)
IN2–IN6, ABP, SDA, SCL, A0, A1,
GPI1–GPI4,
MR, MARGIN,
PO5–PO8
(MAX6874), PO3–PO5 (MAX6875)...................-0.3V to +6V
IN1, PO1–PO4 (MAX6874), PO1–PO2 (MAX6875)...-0.3V to +14V
DBP ..........................................................................-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
–V
IN6
= +2.7V to +5.5V, 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, 2)
PARAMETER
SYMBOL
V
IN1
V
IN3
to
V
IN5
V
IN1P
V
UVLO
CONDITIONS
Voltage on IN1 to ensure the device is fully
operational, IN3–IN6 = GND
Voltage on any one of IN3–IN5 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–IN5 to
guarantee the device is EEPROM configured.
V
IN1
= +13.2V, IN2–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
–V
IN6
(20mV increments)
V
IN3
–V
IN6
(10mV increments)
T
A
= +25°C
Threshold Accuracy
Threshold Hysteresis
Reset Threshold Temperature
Coefficient
Threshold-Voltage Differential
Nonlinearity
V
TH-HYST
∆V
TH
/°C
V
TH
DNL
-1
IN1–IN6, V
IN_
falling
T
A
= -40°C to +85°C
2.5
1.250
2.50
1.250
1.0
0.50
-1.0
-1.5
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
5.5
3.05
5.5
3.05
+1.0
+1.5
%
% V
TH
ppm/
°C
LSB
V
V
V
mA
mA
UNITS
Operating Voltage Range
(Note 3)
IN1 Supply Voltage
(Note 3)
Undervoltage Lockout
2
_______________________________________________________________________________________
EEPROM-Programmable, Hex/Quad,
Power-Supply Sequencers/Supervisors
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
= +6.5V to +13.2V, V
IN2
–V
IN6
= +2.7V to +5.5V, 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, 2)
PARAMETER
IN1 Input Leakage Current
IN2 Input Impedance
IN3–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 16)
011
100
101
110
111
PO1–PO4 (MAX6874), PO1–PO2
(MAX6875) Output Low (Note 3)
PO5–PO8 (MAX6874), PO3–PO5
(MAX6875) Output Low (Note 3)
PO1–PO8 Output Initial Pulldown
Current
PO1–PO8 Output Open-Drain
Leakage Current
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
–V
IN5
160
70
MIN
TYP
100
230
100
MAX
140
320
145
3.5
UNITS
µA
kΩ
kΩ
ms
µs
µs
MAX6874/MAX6875
_______________________________________________________________________________________
3
EEPROM-Programmable, Hex/Quad,
Power-Supply Sequencers/Supervisors
MAX6874/MAX6875
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
= +6.5V to +13.2V, V
IN2
–V
IN6
= +2.7V to +5.5V, 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, 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 19)
011
100
101
110
111
SERIAL INTERFACE LOGIC (SDA, SCL, A0, A1)
Logic-Input Low Voltage
Logic-Input High Voltage
Input Leakage Current
Output Voltage Low
Input/Output Capacitance
V
IL
V
IH
I
LKG
V
OL
C
I/O
I
SINK
= 3mA
10
2.0
-1
+1
0.4
0.8
V
V
µA
V
pF
5
50
5.625
22.5
90
360
1.44
5.76
23.04
92.16
6.25
25
100
400
1.6
6.4
25.6
102.4
6.875
27.5
110
440
1.76
7.04
28.16
112.64
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
4
_______________________________________________________________________________________
EEPROM-Programmable, Hex/Quad,
Power-Supply Sequencers/Supervisors
TIMING CHARACTERISTICS
(IN1 = GND, V
IN2
–V
IN6
= +2.7V to +5.5V, 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, 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 4)
(Note 4)
(Note 4)
(Note 4)
C
BUS
= 400pF
(Note 5)
(Note 6)
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
MAX6874/MAX6875
Note 1:
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
–V
IN6
is between +2.7V and +5.5V, while the remaining V
IN3
–V
IN6
are between 0 and
+5.5V.
Note 2:
Device may be supplied from any one of IN_, except IN2 and IN6.
Note 3:
The internal supply voltage, measured at ABP, equals the maximum of IN3–IN5 if V
IN1
= 0, or equals +5.4V if V
IN1
> +6.5V.
For +4V < V
IN1
< +6.5V and V
IN3
–V
IN5
> +2.7V, the input that powers the device cannot be determined.
Note 4:
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 5:
Input filters on SDA, SCL, A0, and A1 suppress noise spikes < 50ns.
Note 6:
An additional cycle is required when writing to configuration memory for the first time.
_______________________________________________________________________________________
5
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