19-3268; Rev 4; 3/08
4-Channel, 10-Bit, System Monitors with Programmable
Trip Window and SMBus Alert Response
General Description
The MAX1361/MAX1362 low-power, 10-bit, 4-channel,
analog-to-digital converters (ADCs) feature a digitally
programmable window comparator with an interrupt out-
put for automatic system-monitoring applications. Once
configured, monitor mode automatically asserts an inter-
rupt when any analog input exceeds the programmed
upper or lower thresholds, without interaction to the
host. The MAX1361/MAX1362 respond to the SMBus™
alert, allowing quick identification of the alarming device
on a shared interrupt. A programmable delay between
monitoring intervals lowers power consumption at
reduced monitoring rates.
In addition, the MAX1361/MAX1362 integrate an internal
voltage reference, a clock, and a 1.7MHz, high-speed,
I
2
C-compatible, 2-wire, serial interface. The optimized
interface allows a maximum conversion rate of 94.4ksps
in normal mode while reading back the conversion
results. Each of the four analog inputs is configurable for
single-ended or fully differential operation and unipolar
or bipolar operation. Two scan modes utilize on-chip
random access memory (RAM) to allow eight conver-
sions of a selected channel or scanning of a group of
channels to reduce interface overhead.
These devices operate from a single 2.7V to 3.6V
(MAX1361) or 4.5V to 5.5V (MAX1362) supply and
require only 436µA at the maximum sampling rate of
150ksps in monitor mode and 670µA at the maximum
sampling rate of 94.4ksps. AutoShutdown™ powers
down the devices between conversions, reducing sup-
ply current to less than 0.5µA when idle.
The full-scale analog-input range is determined by the
internal reference or by an externally applied reference
voltage ranging from 1V to V
DD
. The MAX1361 features
a 2.048V internal reference, and the MAX1362 features
a 4.096V internal reference.
The MAX1361/MAX1362 are available in a 10-pin
µMAX
®
package and are specified over the extended
(-40°C to +85°C) temperature range. For 12-bit applica-
tions, refer to the pin-compatible MAX1363/MAX1364
data sheet.
Features
♦
Monitor Mode
Programmable Lower/Upper Trip Threshold
Alarm-Status Register Records Fault Events
SMBus Alert Response
Programmable Sampling Intervals
♦
10-Bit I
2
C-Compatible ADC
±1 LSB INL, ±1 LSB DNL
♦
4-Channel Single-Ended or 2-Channel Fully
Differential Inputs
♦
Software Programmable Bipolar/Unipolar
Conversions
♦
Fast Sampling Rate
94.4ksps While Continuously Reading
Conversions
150ksps in Monitor Mode
♦
High-Speed I
2
C-Compatible Serial Interface
100kHz/400kHz Standard/Fast Mode
Up to 1.7MHz High-Speed Mode
6 Available I
2
C Slave Addresses
♦
Single Supply
2.7V to 3.6V (MAX1361)
4.5V to 5.5V (MAX1362)
♦
Internal Reference
2.048V (MAX1361)
4.096V (MAX1362)
♦
External Reference: 1V to V
DD
♦
Low Power
436µA in Monitor Mode (150ksps)
670µA at 94.4ksps
6µA at 1ksps
0.5µA in Power-Down Mode
♦
Small Package
10-Pin µMAX
MAX1361/MAX1362
Applications
System Monitoring/Supervision
Servers/Workstations
High Reliability Power Supplies
Medical Instrumentation
SMBus is a trademark of Intel Corporation.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit and Pin Configuration appear at
end of data sheet.
Ordering Information/Selector Guide
PART
MAX1361EUB+
MAX1361MEUB+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
I
2
C SLAVE ADDRESS
0110100/0110101
0110110/0110111
SUPPLY VOLTAGE (V)
2.7 to 3.6
2.7 to 3.6
+Denotes
a lead-free package.
Ordering Information/Selector Guide continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response
MAX1361/MAX1362
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ..............................................................-0.3V to +6V
AIN0–AIN3, A0, REF to GND......................-0.3V to (V
DD
+ 0.3V)
SDA, SCL,
INT
to GND .............................................-0.3V to +6V
Maximum Current Into Any Pin .........................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ........444.4mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-60°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
DD
= 2.7V to 3.6V (MAX1361), V
DD
= 4.5V to 5.5V (MAX1362), V
REF
= 2.048V (MAX1361), V
REF
= 4.096V (MAX1362), C
REF
=
0.1µF, f
SCL
= 1.7MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Resolution
Relative Accuracy
Differential Nonlinearity
Offset Error
Offset-Error Temperature
Coefficient
Gain Error
Gain Temperature Coefficient
Channel-to-Channel Offset
Matching
Channel-to-Channel Gain
Matching
DYNAMIC PERFORMANCE (f
IN(SINE-WAVE)
= 10kHz, V
IN(P-P)
= V
REF, fSAMPLE
= 94.4ksps)
Signal-to-Noise Plus Distortion
Total Harmonic Distortion
Spurious-Free Dynamic Range
Full-Power Bandwidth
Full-Linear Bandwidth
CONVERSION RATE
Conversion Time (Note 4)
t
CONV
Internal clock
External clock
Internal clock, SCAN[1:0] = 01
Throughput Rate (Note 5)
f
SAMPLE
External clock
Monitor mode, SCAN[1:0] = 10
10.6
53
94.4
150
ksps
6.8
µs
SINAD
THD
SFDR
SINAD > 57dB
-3dB point
Up to the 5th harmonic
60
-70
70
3.0
5.0
dB
dB
dB
MHz
MHz
Relative to FSR
(Note 3)
Relative to FSR
0.3
±0.1
±0.1
0.3
±1
INL
DNL
(Note 2)
No missing codes
SYMBOL
CONDITIONS
MIN
10
±1
±1
±1
TYP
MAX
UNITS
Bits
LSB
LSB
LSB
ppm/°C
LSB
ppm/°C
LSB
LSB
DC ACCURACY (f
SAMPLE
= 94.4ksps) (Note 1)
2
_______________________________________________________________________________________
4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.7V to 3.6V (MAX1361), V
DD
= 4.5V to 5.5V (MAX1362), V
REF
= 2.048V (MAX1361), V
REF
= 4.096V (MAX1362), C
REF
=
0.1µF, f
SCL
= 1.7MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Track/Hold Acquisition Time
Internal Clock Frequency
Aperture Delay (Note 6)
ANALOG INPUT (AIN0–AIN3)
Input Voltage Range, Single-
Ended and Differential (Note 7)
Input Multiplexer Leakage
Current
Input Capacitance
INTERNAL REFERENCE (Note 8)
Reference Voltage
Reference-Voltage Temperature
Coefficient
REF Short-Circuit Current
REF Source Impedance
EXTERNAL REFERENCE
REF Input Voltage Range
REF Input Current
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Current
Input Capacitance
Output Low Voltage
INT
OUTPUT
Output Low Voltage
INT
Leakage Current
Output Capacitance
POWER REQUIREMENTS
Supply Voltage
V
DD
MAX1361
MAX1362
2.7
4.5
3.6
5.5
V
I
SINK
= 3mA
No faults detected
15
0.4
±10
V
µA
pF
V
REF
I
REF
V
IH
V
IL
V
HYST
I
IN
C
IN
V
OL
I
SINK
= 3mA
15
0.4
SCL, SDA
Ao
0.1 x V
DD
0.1 x V
DD
±10
(Note 9)
f
SAMPLE
= 94.4ksps
0.7 x V
DD
0.3 x
1
V
DD
40
V
µA
V
V
V
µA
pF
V
1.5
V
REF
TCV
REF
T
A
= +25°C
MAX1361
MAX1362
2.027
4.055
2.048
4.096
25
2
2.068
4.137
V
ppm/°C
mA
kΩ
Unipolar
Bipolar
ON/OFF leakage current, V
AIN_
= 0 or V
DD
C
IN
0
-V
REF
/ 2
±0.01
22
V
REF
+V
REF
/ 2
±1
V
µA
pF
t
AD
External clock, fast mode
External clock, high-speed mode
SYMBOL
CONDITIONS
MIN
800
2.8
60
30
TYP
MAX
UNITS
ns
MHz
ns
MAX1361/MAX1362
DIGITAL INPUTS/OUTPUTS (SCL, SDA, A
0
)
_______________________________________________________________________________________
3
4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response
MAX1361/MAX1362
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.7V to 3.6V (MAX1361), V
DD
= 4.5V to 5.5V (MAX1362), V
REF
= 2.048V (MAX1361), V
REF
= 4.096V (MAX1362), C
REF
=
0.1µF, f
SCL
= 1.7MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
f
SAMPLE
=
150ksps,
monitor mode
(Note 10)
f
SAMPLE
=
94.4ksps, external
clock
MAX1361
f
SAMPLE
= 40ksps,
internal clock
Internal
External
reference
Internal
External
reference
Internal
External
reference
Internal
f
SAMPLE
= 10ksps,
internal clock
External
reference
Internal
f
SAMPLE
= 1ksps,
internal clock
Supply Current
I
DD
f
SAMPLE
=
150ksps,
monitor mode
(Note10)
f
SAMPLE
=
94.4ksps, external
clock
MAX1362
f
SAMPLE
= 40ksps,
internal clock
External
reference
Internal
External
reference
Internal
External
reference
Internal
External
reference
Internal
f
SAMPLE
= 10ksps,
internal clock
External
reference
Internal
f
SAMPLE
= 1ksps,
internal clock
Shutdown Current
Power-Supply Rejection Ratio
Serial Clock Frequency
Bus Free Time Between a
STOP (P) and a
START (S) Condition
PSRR
f
SCL
t
BUF
1.3
Internal reference on
Internal reference off
Full-scale input (Note 11)
External
reference
MIN
TYP
660
436
900
670
530
230
380
60
330
6
666
436
900
670
530
230
380
60
330
6
330
0.5
±0.01
10
±0.5
400
µA
LSB/V
kHz
µs
1600
1350
1150
900
µA
MAX
1600
1350
1150
900
UNITS
TIMING CHARACTERISTICS FOR FAST MODE (Figures 1a, 2)
4
_______________________________________________________________________________________
4-Channel, 10-Bit, System Monitor with Programmable
Trip Window and SMBus Alert Response
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 2.7V to 3.6V (MAX1361), V
DD
= 4.5V to 5.5V (MAX1362), V
REF
= 2.048V (MAX1361), V
REF
= 4.096V (MAX1362), C
REF
=
0.1µF, f
SCL
= 1.7MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Hold Time for START (S)
Condition
Low Period of the SCL Clock
High Period of the SCL Clock
Setup Time for a Repeated
START Condition (Sr)
Data Hold Time
Data Setup Time
Rise Time of Both SDA and SCL
Signals, Receiving
Fall Time of SDA Transmitting
Setup Time for STOP (P)
Condition
Capacitive Load for Each Bus
Line
Pulse Width of Spike Suppressed
TIMING CHARACTERISTICS FOR HIGH-SPEED MODE (C
B
= 400pF, Figures 1a, 2) (Note 12)
Serial Clock Frequency
Hold Time, Repeated START
Condition (Sr)
Low Period of the SCL Clock
High Period of the SCL Clock
Setup Time for a Repeated
START Condition (Sr)
Data Hold Time
Data Setup Time
Rise Time of SCL Signal
Rise Time of SCL Signal After
Acknowledge Bit
Fall Time of SCL Signal
Rise Time of SDA Signal
Fall Time of SDA Signal
Setup Time for STOP (P)
Condition
Capacitive Load for Each Bus
Pulse Width of Spike Suppressed
f
SCLH
t
HD, STA
t
LOW
t
HIGH
t
SU, STA
t
HD, DAT
t
SU, DAT
t
RCL
t
RCL1
t
FCL
t
RDA
t
FDA
t
SU, STO
C
B
0
Measured from 0.3V
DD
to 0.7V
DD
Measured from 0.3V
DD
to 0.7V
DD
Measured from 0.3V
DD
to 0.7V
DD
Measured from 0.3V
DD
to 0.7V
DD
Measured from 0.3V
DD
to 0.7V
DD
(Note 14)
(Note 13)
(Note 13)
160
320
120
160
0
10
20
20
20
20
20
160
400
10
80
160
80
160
160
150
1.7
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
ns
SYMBOL
t
HD, STA
t
LOW
t
HIGH
t
SU, STA
t
HD, DAT
t
SU, DAT
t
R
t
F
t
SU, STO
C
B
Measured from 0.3V
DD
to 0.7V
DD
Measured from 0.3V
DD
to 0.7V
DD
CONDITIONS
MIN
0.6
1.3
0.6
0.6
0
100
0
0
0.6
400
50
300
300
900
TYP
MAX
UNITS
µs
µs
µs
µs
ns
ns
ns
ns
µs
pF
ns
MAX1361/MAX1362
_______________________________________________________________________________________
5
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