Serial Presence-Detect
For the latest SPD data, refer to Micron's SPD page: www.micron.com/SPD.
Table 14: SPD EEPROM Operating Conditions
Parameter/Condition Symbol Min Max Units
Supply voltage V
DDSPD
1.7 3.6 V
Input high voltage: logic 1; All inputs V
IH
V
DDSPD
× 0.7 V
DDSPD
+ 0.5 V
Input low voltage: logic 0; All inputs V
IL
–0.6 V
DDSPD
× 0.3 V
Output low voltage: I
OUT
= 3mA V
OL
–
0.4 V
Input leakage current: V
IN
= GND to V
DD
I
LI
0.1 3 µA
Output leakage current: V
OUT
= GND to V
DD
I
LO
0.05 3 µA
Standby current I
SB
1.6 4 µA
Power supply current, READ: SCL clock frequency = 100 kHz I
CCR
0.4 1 mA
Power supply current, WRITE: SCL clock frequency = 100 kHz I
CCW
2 3 mA
Table 15: SPD EEPROM AC Operating Conditions
Parameter/Condition Symbol Min Max Units Notes
SCL LOW to SDA data-out valid
t
AA 0.2 0.9 µs 1
Time bus must be free before a new transition can start
t
BUF 1.3
–
µs
Data-out hold time
t
DH 200
–
ns
SDA and SCL fall time
t
F
–
300 ns 2
SDA and SCL rise time
t
R
–
300 ns 2
Data-in hold time
t
HD:DAT 0
–
µs
Start condition hold time
t
HD:STA 0.6
–
µs
Clock HIGH period
t
HIGH 0.6
–
µs
Noise suppression time constant at SCL, SDA inputs
t
I
–
50 µs
Clock LOW period
t
LOW 1.3
–
µs
SCL clock frequency
t
SCL
–
400 kHz
Data-in setup time
t
SU:DAT 100
–
ns
Start condition setup time
t
SU:STA 0.6
–
µs 3
Stop condition setup time
t
SU:STO 0.6
–
µs
WRITE cycle time
t
WRC
–
10 ms 4
Notes:
1. To avoid spurious start and stop conditions, a minimum delay is placed between SCL = 1
and the falling or rising edge of SDA.
2. This parameter is sampled.
3. For a restart condition or following a WRITE cycle.
4. The SPD EEPROM WRITE cycle time (
t
WRC) is the time from a valid stop condition of a
write sequence to the end of the EEPROM internal ERASE/PROGRAM cycle. During the
WRITE cycle, the EEPROM bus interface circuit is disabled, SDA remains HIGH due to pull-
up resistance, and the EEPROM does not respond to its slave address.
2GB, 4GB (x72, ECC, DR) 240-Pin DDR2 SDRAM RDIMM
Serial Presence-Detect
PDF: 09005aef818e3fc8
htf36c256_512x72py.pdf - Rev. D 3/10 EN
17
Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2005 Micron Technology, Inc. All rights reserved.
