參數(shù)資料
型號(hào)： IBMN625404GT3B
廠商： IBM Microeletronics
英文描述： 256Mb Double Data Rate Synchronous DRAM(256M位雙數(shù)據(jù)速率同步動(dòng)態(tài)RAM)
中文描述： 256MB雙數(shù)據(jù)速率同步DRAM（256M位雙數(shù)據(jù)速率同步動(dòng)態(tài)RAM）的
文件頁數(shù)： 62/79頁
文件大?。?/td> 1328K
代理商： IBMN625404GT3B
IBMN625404GT3B
IBMN625804GT3B
256Mb Double Data Rate Synchronous DRAM
Preliminary
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 62 of 79
29L0011.E36997B
1/01
17. An input setup and hold time derating table is used to increase t
IS
and t
IH
in the case where the input slew
rate is below 0.5 V/ns.
18. An input setup and hold time derating table is used to increase t
DS
and t
DH
in the case where the I/O slew
rate is below 0.5 V/ns.
19. An I/O Delta Rise, Fall Derating table is used to increase t
DS
and t
DH
in the case where DQ, DM, and
DQS slew rates differ.
Input Slew Rate
t
IS
t
IH
Unit
Note
0.5 V/ns
0
0
ps
1, 2
0.4 V/ns
+ 50
0
ps
1, 2
0.3 V/ns
+ 100
0
ps
1, 2
1. Input slew rate is based on the lesser of the slew rates determined by either V
IH (AC)
to V
IL (AC)
or V
IH (DC)
to V
IL (DC)
, similarly for
rising transitions.
2. These derating parameters may be guaranteed by design or tester characterization and are not necessarily tested on each
device.
Input Slew Rate
t
DS
t
DH
Unit
Note
0.5 V/ns
0
0
ps
1, 2
0.4 V/ns
+ 75
+ 75
ps
1, 2
0.3 V/ns
+ 150
+ 150
ps
1, 2
1. I/O slew rate is based on the lesser of the slew rates determined by either V
IH (AC)
to V
IL (AC)
or V
IH (DC)
to V
IL (DC)
, similarly for
rising transitions.
2. These derating parameters may be guaranteed by design or tester characterization and are not necessarily tested on each
device.
Delta Rise and Fall Rate
t
DS
t
DH
Unit
Note
0.0 ns/V
0
0
ps
1, 2,
3, 4
0.25 ns/V
+ 50
+ 50
ps
1, 2,
3, 4
0.5 ns/V
+ 100
+ 100
ps
1, 2,
3, 4
1. Input slew rate is based on the lesser of the slew rates determined by either V
IH (AC)
to V
IL (AC)
or V
IH (DC)
to V
IL (DC)
, similarly for
rising transitions.
2. Input slew rate is based on the larger of AC to AC delta rise, fall rate and DC to DC delta rise, fall rate.
3. The delta rise, fall rate is calculated as: [1/(slew rate 1)] - [1/(slew rate 2)]
For example: slew rate 1 = 0.5 V/ns; slew rate 2 = 0.4 V/ns
Delta rise, fall = (1/0.5) - (1/0.4) [ns/V]
= -0.5 ns/V
Using the table above, this would result in an increase in t
DS
and t
DH
of 100 ps.
4. These derating parameters may be guaranteed by design or tester characterization and are not necessarily tested on each
device.
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