IBMN625404GT3B
IBMN625804GT3B
Preliminary
256Mb Double Data Rate Synchronous DRAM
Revision Log
Rev
Contents of Modification
10/99
Initial release; Rev 0.1.
1st Revision; Rev 0.2.
Corrected p/n labelling for stacked devices. Changed 4B to 4K to signify stacked devices have 2 CKE pins, not 1
CKE pin.
Correct typo in Features section. Avg period refresh interval is 7.8µs not 7.8ns.
Added note to pinout that QFC\ is an optional feature and must be specified upon purchasing.
Modified AC and DC operating conditions for V , I , I , V . Added Iolw and Iohw DC parameters.
ix ol oh
ref
Added DDR device labeling guild to device ordering information.
Added p/n’s for devices that support the QFC\ option.
Clarified description of Extended mode register, DLL Enable/Disable, Output drive strength, and QFC\ Enable
/Disable.
Added note to Pinout diagrams that QFC\ is an optional feature and must be specified via p/n when ordering
devices.
Removed the word “optional” from the Drive Strength Field in the Extended Mode Register Definition Diagram.
Changed Vil (DC) and V (DC) to V -0.15V and V +0.15V, respectively.
ih
ref
ref
Changed Vil (AC) and V (AC) to V -0.31V and V +0.31V, respectively.
ih
ref
ref
Added Idd values for PC200 and PC266 speed sorts.
Removed t (min) and t (min) from AC timing parameters.
DQSQ
DQSQA
03/24/00
Changed AC Timing Load Circuit diagram and added QFC\ Timing Load Circuit diagram.
Added t parameter to AC timings and modified t & t to reflect slow and fast input slew rates.
IPW
IS
IH
Changed Input capacitance for all inputs and outputs (except CK and CK\).
Added delta input capacitance specification for all inputs and outputs (except QFC\)
AC Operating Characteristics: changed definition of Vix from input “closing” point to input “crossing” point.
Added new AC timing parameter (t ).
HP
Replaced AC timing parameter t with t
DV
QH
Modified Dataout Read Timing Diagram to remove reference to t and replace with t and t .
QH
DV
Changed RAS, CAS, and WE to RAS, CAS, and WE where applicable.
Added further clarification to “Initialization” description.
HP
Added tRAS lockout description under auto precharge description with supporting timing diagram.
Added t
Added t
as a new parameter to AC timing parameters.
lock out support to Features section.
RAP
RAS
Removed statement from Auto Refresh section that states “a maximum of 8 auto refresh commands can be
posted in the system”.
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
29L0011.E36997B
1/01
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