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DDF16C64_128x64A.fm - Rev. B 11/07 EN
10 ©2007 Micron Technology, Inc. All rights reserved
512MB, 1GB (x64, DR) 184-Pin DDR SDRAM UDIMM
Serial Presence-Detect
Serial Presence-Detect
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 resis-
tance, and the EEPROM does not respond to its slave address.
Serial Presence-Detect Data
For the latest serial presence-detect data, refer to Micron’s SPD page:
www.micron.com/SPD.
Table 11: Serial Presence-Detect EEPROM DC Operating Conditions
Parameter/Condition Symbol Min Max Units
Supply voltage VDDSPD 2.3 3.6 V
Input high voltage: Logic 1; All inputs VIH VDDSPD × 0.7 VDDSPD + 0.5 V
Input low voltage: Logic 0; All inputs V
IL –1.0 VDDSPD × 0.3 V
Output low voltage: I
OUT = 3mA VOL –0.4V
Input leakage current: VIN = GND to VDD ILI –10µA
Output leakage current: V
OUT = GND to VDD ILO –10µA
Standby current: SCL = SDA = V
DD - 0.3V; All other inputs = VSS or VDD ISB –30µA
Power supply current: SCL clock frequency = 100 kHz ICC –2.0mA
Table 12: Serial Presence-Detect 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 the bus must be free before a new transition can start
t
BUF 1.3 – µs
Data-out hold time
t
DH 200 – ns
Clock/data fall time
t
F – 300 ns 2
Clock/data 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–50ns
Clock LOW period
t
LOW 1.3 – µs
SCL clock frequency
f
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
