Internet Data Sheet
HYB18TC1G[80/16]0AF
1-Gbit DDR2 SDRAM
7
Timing Characteristics
This chapter contains speed grade definition, AC timing parameter and ODT tables.
7.1
Speed Grade Definitions
All Speed grades faster than DDR2-DDR400B comply with DDR2-DDR400B timing specifications (tCK = 5ns with tRAS = 40ns).
List of Speed Grade Definition tables:
•
•
•
Table 37 “Speed Grade Definition Speed Bins for DDR2–667D” on Page 34
Table 38 “Speed Grade Definition Speed Bins for DDR2–533C” on Page 35
Table 39 “Speed Grade Definition Speed Bins for DDR2–400B” on Page 36
TABLE 37
Speed Grade Definition Speed Bins for DDR2–667D
Speed Grade
DDR2–667D
Unit
Note
IFX Sort Name
–3S
CAS-RCD-RP latencies
5–5–5
Min.
tCK
Parameter
Symbol
Max.
—
1)2)3)4)
1)2)3)4)
1)2)3)4)
1)2)3)4)5)
1)2)3)4)
1)2)3)4)
1)2)3)4)
Clock Frequency
@ CL = 3
@ CL = 4
@ CL = 5
tCK
5
8
ns
ns
ns
ns
ns
ns
ns
tCK
3.75
3
8
tCK
8
Row Active Time
Row Cycle Time
RAS-CAS-Delay
Row Precharge Time
tRAS
tRC
tRCD
tRP
45
60
15
15
70000
—
—
—
1) Timings are guaranteed with CK/CK differential Slew Rate of 2.0 V/ns. For DQS signals timings are guaranteed with a differential Slew
Rate of 2.0 V/ns in differential strobe mode and a Slew Rate of 1 V/ns in single ended mode.Timings are further guaranteed for normal
OCD drive strength (EMRS(1) A1 = 0) under the “Reference Load for Timing Measurements” .
2) The CK/CK input reference level (for timing reference to CK/CK) is the point at which CK and CK cross. The DQS / DQS, RDQS / RDQS,
input reference level is the crosspoint when in differential strobe mode; The input reference level for signals other than CK/CK, DQS / DQS,
RDQS / RDQS is defined.
3) Inputs are not recognized as valid until VREF stabilizes. During the period before VREF stabilizes, CKE = 0.2 x VDDQ is recognized as low.
4) The output timing reference voltage level is VTT
.
5) RAS.MAX is calculated from the maximum amount of time a DDR2 device can operate without a refresh command which is equal to 9 x tREFI
t
.
Rev. 1.11, 2006-09
34
03292006-PJAE-UQLG
QIMONDA [ QIMONDA AG ]
