HYB18T512400BF Datasheet, PDF (36/57 Pages) Qimonda AG – 512-Mbit Double-Data-Rate-Two SDRAM

HYB18T512xxxBF–[2.5…5]
512-Mbit Double-Data-Rate-Two 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(t_CK = 5ns with
t_RAS = 40ns).
List of Speed Grade Definition tables:
• Table 37 “Speed Grade Definition Speed Bins DDR2–800” on Page 36
• Table 38 “Speed Grade Definition Speed Bins for DDR2–667” on Page 37
• Table 39 “Speed Grade Definition Speed Bins for DDR2–533C” on Page 37
• Table 40 “Speed Grade Definition Speed Bins for DDR2–400B” on Page 38
Table 37 Speed Grade Definition Speed Bins DDR2–800
Speed Grade
DDR2–800D
DDR2–800E
Unit Note
IFX Sort Name
–2.5F
–2.5
CAS-RCD-RP latencies
5–5–5
6–6–6
t_CK
Parameter
Symbol Min. Max.
Min. Max.
—
Clock Frequency
@ CL = 3
t_CK
5
8
5
8
ns
1)2)3)4)
@ CL = 4
t_CK
3.75 8
3.75 8
ns —
@ CL = 5
t_CK
2.5 8
3
8
ns —
Row Active Time
@ CL = 6
t_CK
t_RAS
2.5 8
2.5 8
ns —
45
70000 45
70000 ns
5)
Row Cycle Time
t_RC
57.5 —
60
—
ns —
RAS-CAS-Delay
t_RCD
12.5 —
15
—
ns —
Row Precharge Time
t_RP
12.5 —
15
—
ns —
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.
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 V_REF stabilizes. During the period before V_REF stabilizes, CKE = 0.2 x V_DDQ is
recognized as low.
4) The output timing reference voltage level is V_TT.
5) t_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 t_REFI.
Internet Data Sheet
36
Rev. 1.05, 2007-01
03292006-YBYM-WG0Z