HYB18TC256160AF_1 Datasheet, PDF (34/55 Pages) Qimonda AG – 256-Mbit Double-Data-Rate-Two SDRAM DDR2 SDRAM

Internet Data Sheet
HYB18TC256160AF
256-Mbit Double-Data-Rate-Two SDRAM
Speed Grade
TABLE 38
Speed Grade Definition Speed Bins for DDR2–533C
DDR2–533C
Unit
Note
QAG Sort Name
–3.7
CAS-RCD-RP latencies
4–4–4
t_CK
Parameter
Symbol
Min.
Max.
—
Clock Frequency
@ CL = 3
t_CK
5
8
ns
1)2)3)4)
@ CL = 4
t_CK
3.75
8
ns
1)2)3)4)
@ CL = 5
t_CK
3.75
8
ns
1)2)3)4)
Row Active Time
t_RAS
45
70000
ns
1)2)3)4)5)
Row Cycle Time
t_RC
60
—
ns
1)2)3)4)
RAS-CAS-Delay
t_RCD
15
—
ns
1)2)3)4)
Row Precharge Time
t_RP
15
—
ns
1)2)3)4)
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 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.
Speed Grade
TABLE 39
Speed Grade Definition Speed Bins for DDR2-400B
DDR2–400B
Unit
Note
QAG Sort Name
–5
CAS-RCD-RP latencies
3–3–3
t_CK
Parameter
Symbol
Min.
Max.
—
Clock Frequency
@ CL = 3
t_CK
5
8
ns
1)2)3)4)
@ CL = 4
t_CK
5
8
ns
1)2)3)4)
@ CL = 5
t_CK
5
8
ns
1)2)3)4)
Row Active Time
t_RAS
40
70000
ns
1)2)3)4)5)
Row Cycle Time
t_RC
55
—
ns
1)2)3)4)
RAS-CAS-Delay
t_RCD
15
—
ns
1)2)3)4)
Row Precharge Time
t_RP
15
—
ns
1)2)3)4)
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. For other Slew Rates see Chapter 8Timings
are further guaranteed for normal OCD drive strength (EMRS(1) A1 = 0) under the “Reference Load for Timing Measurements” according
to Chapter 8.1 only.
Rev. 1.20, 2007-04
34
03062006-H3V1-XJT4