IBM11M4730H
IBM11M4730HB
4M x 72 DRAM MODULE
Refresh Cycle
-60
-70
Symbol
Parameter
Unit
Notes
Min
8
Max
—
Min
8
Max
—
CAS Hold Time
(CAS before RAS Refresh Cycle)
tCHR
tCSR
tWRP
tWRH
ns
ns
ns
ns
CAS Setup Time
(CAS before RAS Refresh Cycle)
14
15
8
—
—
—
14
15
8
—
—
—
WE Setup Time
(CAS before RAS Refresh Cycle)
WE Hold Time
(CAS before RAS Refresh Cycle)
tRPC
tREF
RAS Precharge to CAS Hold Time
Refresh Period
3
—
3
—
ns
—
32
—
32
ms
1
1. 2048 refreshes are required every 64ms.
Presence Detect Read Cycle
-60
-70
Symbol
Parameter
Unit
Notes
Min
—
0
Max
Min
Max
tPD
PDE to Valid Presence Detect Data
10
10
—
0
10
10
ns
ns
1
2
tPDOFF
PDE Inactive to Presence Detects Inactive
1. Measured with the specified current load and 100pF.
2. tPDOFF(max) defines the time at which the output achieves the open circuit condition and is not referenced to output voltage levels.
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
54H8529
SA14-4637-01
Released 3/96
Page 11 of 26
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