General Description
The MAX6618 PECI-to-I
2
C translator provides an effi-
cient, low-cost solution for PECI-to-SMBus
TM
/I
2
C proto-
col conversion. The PECI-compliant host reads
temperature data directly from up to four PECI-enabled
CPUs.
The I
2
C interface provides an independent serial com-
munication channel to communicate synchronously with
peripheral devices in a multiple master or multiple slave
system. This interface allows a maximum serial-data
rate of 400kbps.
The MAX6618 is designed to operate from a +3.0V to
+3.6V supply voltage and ambient temperature range
of -20°C to +120°C.
Applications
Servers
Workstations
Desktop Computers
Features
400kbps I
2
C-Compatible, 2-Wire Serial Interface
+3V to +3.6V Supply Voltage
PECI-Compliant Port
PECI-to-I
2
C Translation
Programmable Temperature Offsets
-20°C to +120°C Operating Temperature Range
V
REF
Input Refers Logic Levels to the PECI
Supply Voltage
Automatic I
2
C Bus Lockup Timeout Reset
Lead-Free, 10-Pin µMAX
®
Package
MAX6618
PECI-to-I
2
C Translator
________________________________________________________________
Maxim Integrated Products
1
I
2
C
MASTER
SDA
SCL
SDA
SCL
PECI
+3.3V
V
CPU
V
TT
GND
CPU
INTERNAL
TEMP
SENSOR
V
REF
V
CC
AD0
AD1
AD2
MAX6618
Typical Application Circuit
19-0730; Rev 2; 2/11
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.
Pin Configuration appears at end of data sheet.
Ordering Information
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PART TEMP RANGE PIN-PACKAGE
MAX6618AUB+ -20°C to +120°C 10 μMAX
MAX6618AUB+T -20°C to +120°C 10 μMAX
SMBus is a trademark of Intel Corp.
μMAX is a registered trademark of Maxim Integrated Products.
MAX6618
PECI-to-I
2
C Translator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, V
CC
= +3V to +3.6V, V
REF
= +0.95V to +1.26V, T
A
= -20°C to +120°C, unless otherwise noted. Typical
values are at V
CC
= +3.3V, V
REF
= +1.0V, T
A
= +25°C.) (Note 1)
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.
(All voltages with respect to GND.)
V
CC
..........................................................................-0.3V to +4V
AD0, AD1, AD2,..........................................-0.3V to (V
CC
+ 0.3V)
SCL, SDA .................................................................-0.3V to +6V
V
REF
.........................................................................-0.3V to +4V
PECI .........................................................-0.3V to (V
REF
+ 0.3V)
DC Current through SDA ...................................................10mA
Continuous Power Dissipation (T
A
= +70°C)
μMAX (derate 5.6mW/°C over T
A
= +70°C).................444mW
Operating Temperature Range .........................-20°C to +120°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SUPPLY
Operating Supply Voltage V
CC
3.0 3.6 V
Operating Supply Current I
CC
SCL = 400kHz 4 7 mA
Power-On-Reset Voltage V
POR
2.60 2.95 V
INPUT SCL, INPUT/OUTPUT SDA
Low-Level Input Voltage V
IL
0.3
x V
CC
V
High-Level Input Voltage V
IH
0.7
x V
CC
5.5 V
Low-Level Output Voltage V
OL
I
OL
= 6mA 0.4 V
Leakage Current I
L
-1 +1 μA
Input Capacitance C
I
10 pF
ADDRESS INPUT AD0
Low-Level Input Voltage V
IL
0.3
x V
CC
V
High-Level Input Voltage V
IH
0.7
x V
CC
V
CC
+ 0.3
V
Leakage Current I
L
-2 +2 μA
Input Capacitance C
I
10 pF
PECI
Supply Voltage to PECI Cell V
REF
0.95 1.26 V
Input Voltage Range V
IN
-0.3
V
REF
+ 0.3
V
Low-Level Input Voltage
Threshold
V
IL
0.275
x V
REF
0.500
x V
REF
V
High-Level Input Voltage
Threshold
V
IH
0.550
x V
REF
0.725
x V
REF
V
MAX6618
PECI-to-I
2
C Translator
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(
Typical Application Circuit
, V
CC
= +3V to +3.6V, V
REF
= +0.95V to +1.26V, T
A
= -20°C to +120°C, unless otherwise noted. Typical
values are at V
CC
= +3.3V, V
REF
= +1.0V, T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Hysteresis V
H
0.1
x V
REF
V
Low-Level Sinking Current I
IL
0.5 1.0 mA
High-Level Sourcing Current I
IH
-6 mA
Input Capacitance C
I
(Note 2) 10 pF
Signal-Noise Immunity Above
300MHz
V
N
(Note 2)
0.1
x V
REF
V
P-P
TIMING CHARACTERISTICS
(
Typical Application Circuit
, V
CC
= +3V to +3.6V, V
REF
= +0.95V to +1.26V, T
A
= -20°C to +120°C, unless otherwise noted. Typical
values are at V
CC
= +3.3V, V
REF
= +1.0V, T
A
= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
2
C INTERFACE
Serial-Clock Frequency f
SCL
400 kHz
Bus Free Time Between a
STOP and a START Condition
t
BUF
1.3 μs
Hold Time, (Repeated) START
Condition
t
HD
,
STA
0.6 μs
Repeated START Condition
Setup Time
t
SU
,
STA
0.6 μs
STOP Condition Setup Time t
SU
,
STO
0.6 μs
Data Hold Time t
HD
,
DAT
(Note 3) 0.9 μs
Data Setup Time t
SU
,
DAT
120 ns
SCL Clock-Low Period t
LOW
1.3 μs
SCL Clock-High Period t
HIGH
0.6 μs
Rise Time of Both SDA and
SCL Signals, Receiving
t
R
(Notes 4, 5)
20
+ 0.1C
b
300 ns
Fall Time of Both SDA and
SCL Signals, Receiving
t
F
(Notes 4, 5)
20
+ 0.1C
b
300 ns
Fall Time of SDA Transmitting t
F.TX
(Notes 4, 5)
20
+ 0.1C
b
250 ns
Pulse Width of Spike
Suppressed
t
SP
(Notes 2, 6) 50 160 ns
Capacitive Load for Each
Bus Line
C
b
(Notes 2, 4) 400 pF
PECI INTERFACE
Overall time evident on PECI 0.495 500
Bit Time (Note 7) t
BIT
Driven by MAX6618 0.495 250
μs

MAX6618AUB+TG126

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
Interface - Specialized PECI-to-I2C Translator
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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