Serial Presence-Detect
For the latest SPD data, refer to Micron's SPD page: www.micron.com/SPD.
Table 15: 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 16: 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 ns
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.
512MB, 1GB (x72, ECC, SR) 244-Pin DDR2 VLP Mini-RDIMM
Serial Presence-Detect
PDF: 09005aef83d09b45
hvf9c64_128x72pkz.pdf - Rev. C 4/14 EN
16
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© 2009 Micron Technology, Inc. All rights reserved.
