Internet Data Sheet
HYS[64/72]T[32/64/128]xx0HU-[25F/2.5/3/3S/3.7/5]-B
Unbuffered DDR2 SDRAM Module
3.3
Timing Characteristics
This chapter describes the AC Characteristics.
3.3.1
Speed Grade Definitions
All Speed grades faster than DDR2-DDR400B comply with DDR2-DDR400B timing specifications(tCK = 5ns with tRAS = 40ns).
Speed Grade Definition for: DDR2–800(Table 12), DDR2–667(Table 13), DDR2–533C(Table 14) and DDR2–400B(Table 15)
TABLE 12
Speed Grade Definition Speed Bins for DDR2–800
Speed Grade
DDR2–800D
DDR2–800E
Unit
Note
QAG Sort Name
CAS-RCD-RP latencies
–25F
–2.5
5–5–5
6–6–6
tCK
Parameter
Symbol
Min.
Max.
Min.
Max.
—
1)2)3)4)
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
@ CL = 6
tCK
5
8
5
8
ns
ns
ns
ns
ns
ns
ns
ns
tCK
3.75
2.5
8
3.75
3
8
tCK
8
8
tCK
2.5
8
2.5
45
60
15
15
8
Row Active Time
Row Cycle Time
RAS-CAS-Delay
Row Precharge Time
tRAS
tRC
tRCD
tRP
45
70000
—
70000
—
57.5
12.5
12.5
—
—
—
—
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)
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.
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
.
TABLE 13
Speed Grade Definition Speed Bins for DDR2–667
Speed Grade
DDR2–667C
DDR2–667D
Unit
Note
QAG Sort Name
CAS-RCD-RP latencies
–3
–3S
4–4–4
5–5–5
tCK
Parameter
Symbol
Min.
Max.
Min.
Max.
—
1)2)3)4)
1)2)3)4)
1)2)3)4)
Clock Frequency
@ CL = 3
@ CL = 4
@ CL = 5
tCK
tCK
tCK
5
3
3
8
8
8
5
8
8
8
ns
ns
ns
3.75
3
Rev. 1.3, 2006-12
18
03292006-6GMD-RSFT
QIMONDA [ QIMONDA AG ]
