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MAX6621AUB+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
General Description
The MAX6621 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. Interrupts are generated when the measured
temperature exceeds the high-temperature limit and
causes ALERT to assert. The RESET input allows the
host to reset the I
2
C bus in the event of a communica-
tion error.
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 MAX6621 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
♦ ALERT Output
♦ RESET Input (May Be Disabled as a Factory
Option)
♦ 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
Ordering Information
T = Tape and reel.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
PART TEMP RANGE PIN-PACKAGE
MAX6621AUB+ -20°C to +120°C 10 μMAX
MAX6621AUB+T -20°C to +120°C 10 μMAX
19-0729; Rev 2; 12/09
MAX6621
PECI-to-I
2
C Translator
________________________________________________________________
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.
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
ALERT
RESET
MAX6621
Typical Application Circuit
Pin Configuration appears at end of data sheet.
SMBus is a trademark of Intel Corp.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX6621
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, RESET, ALERT...................................-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)
10-Pin 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
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
ALERT
Low-Level Output Voltage V
OL
I
OL
= 6mA 0.4 V
ADDRESS INPUT AD0/RST
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
MAX6621
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
RESET Pulse Width RST 100 ns
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
(Note 6) 50 160 ns
Capacitive Load for Each
Bus Line
C
b
(Note 4) 400 pF
PECI INTERFACE
Overall time evident on PECI 0.495 500
Bit Time (Note 7) t
BIT
Driven by MAX6621 0.495 250
μs
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX6621AUB+

Mfr. #:
Buy MAX6621AUB+
Manufacturer:
Maxim Integrated
Description:
Translation - Voltage Levels MAX6621 PROTOCOL CONVERTER USOP PB
Lifecycle:
New from this manufacturer.
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