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EDD2508AKTA-5 Datasheet(PDF) 6 Page - Elpida Memory

Part No. EDD2508AKTA-5
Description  256M bits DDR SDRAM (32M words x 8 bits, DDR400)
Download  48 Pages
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Manufacturer  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

EDD2508AKTA-5 Datasheet(HTML) 6 Page - Elpida Memory

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EDD2508AKTA-5
Preliminary Data Sheet E0349E60 (Ver. 6.0)
6
Pin Capacitance (TA = +25°C, VDD, VDDQ = 2.6V ± 0.1V)
Parameter
Symbol
Pins
min.
typ.
max.
Unit
Notes
Input capacitance
CI1
CK, /CK
2.0
3.0
pF
1
CI2
All other input pins
2.0
3.0
pF
1
Delta input capacitance
Cdi1
CK, /CK
0.25
pF
1
Cdi2
All other input-only pins
0.5
pF
1
Data input/output capacitance
CI/O
DQ, DM, DQS
4.0
5
pF
1, 2
Delta input/output capacitance
Cdio
DQ, DM, DQS
0.5
pF
1
Notes: 1. These parameters are measured on conditions:
f = 100MHz, VOUT = VDDQ/2,
∆VOUT = 0.2V,
TA = +25
°C.
2. DOUT circuits are disabled.
AC Characteristics (TA = 0 to +70
°C, VDD, VDDQ = 2.6V ± 0.1V, VSS, VSSQ = 0V)
-5B
-5C
Parameter
Symbol
min.
max.
min.
max.
Unit
Notes
Clock cycle time
tCK
5
8
5
8
ns
10
CK high-level width
tCH
0.45
0.55
0.45
0.55
tCK
CK low-level width
tCL
0.45
0.55
0.45
0.55
tCK
CK half period
tHP
min
(tCH, tCL)
min
(tCH, tCL)
tCK
DQ output access time from CK, /CK
tAC
–0.7
0.7
–0.7
0.7
ns
2, 11
DQS output access time from CK, /CK
tDQSCK
–0.55
0.55
–0.55
0.55
ns
2, 11
DQS to DQ skew
tDQSQ
0.4
0.4
ns
3
DQ/DQS output hold time from DQS
tQH
tHP – tQHS —
tHP – tQHS —
ns
Data hold skew factor
tQHS
0.5
0.5
ns
Data-out high-impedance time
from CK, /CK
tHZ
0.7
0.7
ns
5, 11
Data-out low-impedance time
from CK, /CK
tLZ
–0.7
0.7
–0.7
0.7
ns
6, 11
Read preamble
tRPRE
0.9
1.1
0.9
1.1
tCK
Read postamble
tRPST
0.4
0.6
0.4
0.6
tCK
DQ and DM input setup time
tDS
0.4
0.4
ns
8
DQ and DM input hold time
tDH
0.4
0.4
ns
8
DQ and DM input pulse width
tDIPW
1.75
1.75
ns
7
Write preamble setup time
tWPRES
0
0
ns
Write preamble
tWPRE
0.25
0.25
tCK
Write postamble
tWPST
0.4
0.6
0.4
0.6
tCK
9
Write command to first DQS latching
transition
tDQSS
0.72
1.28
0.72
1.28
tCK
DQS falling edge to CK setup time
tDSS
0.2
0.2
tCK
DQS falling edge hold time from CK
tDSH
0.2
0.2
tCK
DQS input high pulse width
tDQSH
0.35
0.35
tCK
DQS input low pulse width
tDQSL
0.35
0.35
tCK
Address and control input setup time
tIS
0.6
0.6
ns
8
Address and control input hold time
tIH
0.6
0.6
ns
8
Address and control input pulse width
tIPW
2.2
2.2
ns
7
Mode register set command cycle time
tMRD
2
2
tCK


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