SM4M64ALDT-6 Enhanced Memory Systems, Inc., SM4M64ALDT-6 Datasheet - Page 11

• Manufacturer Part Number: SM4M64ALDT-6
• Description: 168-pin Low Profile ESDRAM DIMM
• Manufacturer: Enhanced Memory Systems, Inc.

Preliminary Data Sheet
Read and Write Parameters
Notes:
1.
2.
3.
Refresh Parameters
Notes:
1.
2.
3.
Enhanced Memory Systems Inc., 1850 Ramtron Dr., Colo Spgs, CO 80921
PHONE: (800) 545-DRAM; FAX: [phone];
Revision 1.0
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
AC3
AC2
AC1
OH3
OH2
OH1
LZ
HZ2
HZ1
DQZ
DS
DH
DPL
DAL
DQW
REF
SREX
Symbol
Symbol
Access time is measured at 1.4V (LVTTL) at max clock rate for the CAS latency specified. See AC Test Load.
Access time is based on a clock rise time of 1ns. If clock rise time is longer than 1ns, then (trise/2-0.5) ns must be added to the access time.
Referenced to the time at which the output achieves an open circuit condition.
4096 cycles.
Any time that the refresh period has been exceeded, a minimum of two Auto-Refresh (CBR) commands must be given to “wake up” the device.
Self-Refresh exit is a synchronous operation and begins on the 2nd positive clock edge after CKE returns high. Self-Refresh Exit is not
completed until tRC is satisfied once the Self-Refresh Exit command is registered.
Clock Access Time, CL = 3
Clock Access Time, CL = 2
Clock Access Time, CL = 1
Data Output Hold Time (CL=3)
Data Output Hold Time (CL=2)
Data Output Hold Time (CL=1)
Data Output to Low-Z Time
Data Output to High-Z Time (CL=2, 3)
Data Output to High-Z Time (CL=1)
DQM Data Output Disable Time
Data Input Set-Up Time
Data Input Hold Time
Data Input to Precharge
Data Input to ACTV/Refresh
Data Write Mask Latency
Refresh Period
Self Refresh Exit Time
Parameter
Parameter
http://www.edram.com
2CLK+t
20.0
Min
2.0
2.3
3.0
1.5
0.8
6.0
Min
0
2
0
-
-
-
-
-
-
RC
-6
-6
Max
10.5
4.3
4.6
4.6
7.0
Max
64
-
-
-
-
-
-
-
-
-
-
The information contained herein is subject to change without notice.
168-pin Low Profile ESDRAM DIMMs
2CLK+t
22.5
Min
2.0
2.3
3.0
1.5
0.8
7.5
Min
2001 Enhanced Memory Systems. All rights reserved.
0
2
0
-
-
-
-
-
-
RC
-7.5
-7.5
Max
32MB, 64MB, 128MB
Max
4.5
4.8
4.8
7.5
11
64
-
-
-
-
-
-
-
-
-
-
-
Units
Units
CLK
CLK
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Page 11 of 15
Notes
Notes
1,2
1,2
1,2
1,2
3
3
3