mt18jsf25672az Micron Semiconductor Products, mt18jsf25672az Datasheet - Page 14

• Manufacturer Part Number: mt18jsf25672az
• Description: 2gb, 4gb X72, Ecc, Dr 240-pin Ddr3 Sdram Udimm
• Manufacturer: Micron Semiconductor Products

Temperature Sensor with Serial Presence-Detect EEPROM
Serial Presence-Detect EEPROM Operation
Table 13: Temperature Sensor with Serial Presence-Detect EEPROM Operating Conditions
Table 14: Sensor and EEPROM Serial Interface Timing
PDF: 09005aef83606b46
jsf18c256_512x72az.pdf – Rev. B 5/09
Parameter/Condition
Supply voltage
Supply current: Vdd = 3.3V
Input high voltage: Logic 1; SCL, SDA
Input low voltage: Logic 0; SCL, SDA
Output low voltage: Iout = 2.1mA
Input current
Temperature sensing range
Temperature sensor accuracy (initial release)
Temperature sensor accuracy (class B)
Parameter/Condition
Time bus must be free before a new transition can
start
SDA fall time
SDA rise time
Data hold time
Start condition hold time
Clock HIGH period
Clock LOW period
The temperature from the integrated thermal sensor is monitored and converts into a
digital word via the I
to create a custom temperature-sensing solution based on system requirements. Pro-
gramming and configuration details comply with JEDEC standard No. 21-C page 4.7-1,
“Definition of the TSE2002av, Serial Presence Detect with Temperature Sensor.”
DDR3 SDRAM modules incorporate serial presence-detect. The SPD data is stored in a
256-byte EEPROM. The first 128 bytes are programmed by Micron to comply with JE-
DEC standard JC-45, “Appendix X: Serial Presence Detect (SPD) for DDR3 SDRAM
Modules.” These bytes identify module-specific timing parameters, configuration infor-
mation, and physical attributes. User-specific information can be written into the
remaining 128 bytes of storage. READ/WRITE operations between the system (master)
and the EEPROM (slave) device occur via an I
Vss, permanently disabling hardware write protect. For further information please refer
to Micron technical note TN-04-42, "Memory Module Serial Presence-Detect."
Temperature Sensor with Serial Presence-Detect EEPROM
2GB, 4GB (x72, ECC, DR) 240-Pin DDR3 SDRAM UDIMM
2
C bus. System designers can use the user-programmable registers
t
Symbol
Symbol
Vddspd
HD:DAT
t
t
t
H:STA
t
HIGH
LOW
Idd
Vih
Vol
BUF
14
Vil
Iin
t
t
–
–
–
R
F
Micron Technology, Inc. reserves the right to change products or specifications without notice.
+1.45
Min
Min
+3.0
–5.0
–2.0
–1.0
2
200
–40
4.7
4.0
4.0
4.7
20
C bus. Write protect (WP) is connected to
–
–
–
–
Vddspd + 1
+0.55
1,000
+125
Max
Max
+3.6
+2.0
+0.4
+5.0
+2.0
+1.0
300
900
© 2009 Micron Technology, Inc. All rights reserved.
50
–
–
–
Units
Units
mA
µA
°C
°C
°C
µs
ns
ns
ns
µs
µs
µs
V
V
V
V