EBD25UC8AMFA Datasheet, PDF (11/18 Pages) Elpida Memory – 256MB Unbuffered DDR SDRAM DIMM

EBD25UC8AMFA
Pin Capacitance (TA = 25°C, VDD = 2.5V ± 0.2V)
Parameter
Input capacitance
Input capacitance
Data and DQS input/output
capacitance
Symbol
CI1
CI2
CO
Pins
max.
Address, /RAS, /CAS, /WE,
/CS, CKE
75
CK, /CK
60
DQ, DQS
15
Unit
Notes
pF
pF
pF
AC Characteristics (TA = 0 to +70°C, VDD, VDDQ = 2.5V ± 0.2V, VSS = 0V)
(DDR SDRAM Component Specification)
Parameter
Clock cycle time
(CL = 2)
(CL = 2.5)
CK high-level width
CK low-level width
CK half period
DQ output access time from CK, /CK
DQS output access time from CK, /CK
DQS to DQ skew
DQ/DQS output hold time from DQS
Data hold skew factor
Data-out high-impedance time from CK, /CK
Data-out low-impedance time from CK, /CK
Read preamble
Read postamble
DQ and DM input setup time
DQ and DM input hold time
DQ and DM input pulse width
Write preamble setup time
Write preamble
Write postamble
Write command to first DQS latching transition
DQS falling edge to CK setup time
DQS falling edge hold time from CK
DQS input high pulse width
DQS input low pulse width
Address and control input setup time
Address and control input hold time
Address and control input pulse width
Mode register set command cycle time
Active to Precharge command period
Active to Active/Auto refresh command period
Auto refresh to Active/Auto refresh command period
Active to Read/Write delay
Symbol
tCK
tCK
tCH
tCL
tHP
tAC
tDQSCK
tDQSQ
tQH
tQHS
tHZ
tLZ
tRPRE
tRPST
tDS
tDH
tDIPW
tWPRES
tWPRE
tWPST
tDQSS
tDSS
tDSH
tDQSH
tDQSL
tIS
tIH
tIPW
tMRD
tRAS
tRC
tRFC
tRCD
min.
max.
Unit
7.5
12
ns
6
12
ns
0.45
0.55
tCK
0.45
0.55
tCK
min
(tCH, tCL)
—
tCK
–0.7
0.7
ns
–0.6
0.6
ns
—
0.45
ns
tHP – tQHS —
ns
—
0.55
ns
–0.7
0.7
ns
–0.7
0.7
ns
0.9
1.1
tCK
0.4
0.6
tCK
0.45
—
ns
0.45
—
ns
1.75
—
ns
0
—
ns
0.25
—
tCK
0.4
0.6
tCK
0.75
1.25
tCK
0.2
—
tCK
0.2
—
tCK
0.35
—
tCK
0.35
—
tCK
0.75
—
ns
0.75
—
ns
2.2
—
ns
2
—
tCK
42
120000
ns
60
—
ns
72
—
ns
18
—
ns
Notes
10
2, 11
2, 11
3
5, 11
6, 11
8
8
7
9
8
8
7
Preliminary Data Sheet E0452E10 (Ver. 1.0)
11