64Mbit – Enhanced SDRAM
8Mx8, 4Mx16 ESDRAM
Preliminary Datasheet
Clock and Clock Enable Parameters
Symbol
Parameter
-6
-7.5
-10
Units
Notes
Min
6
12
-
-
-
2.4
5
1.5
0.8
1.5
-
Max
166MHz
Min
7.5
15
-
-
-
2.8
6
1.5
0.8
1.5
-
Max
133MHz
Min
10
15
-
-
-
3.5
6
2.0
1.0
2.0
-
Max
100MHz
tCK2
tCK1
tAC3
tAC2
Clock Cycle Time, CL = 2, 3
Clock Cycle Time, CL = 1
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
83MHz
66MHz
66MHz
Clock Access Time, CL = 3
Clock Access Time, CL = 2
Clock Access Time, CL = 1
Clock High & Low Times, CL = 2, 3
Clock High & Low Times, CL = 1
Clock Enable Set-Up Time
Clock Enable Hold Time
CKE Set-Up Time (Power down mode)
Transition Time (Rise and Fall)
4.3
4.6
10.5
-
-
-
-
-
2
4.5
4.8
11
-
-
-
-
-
3
4.7
5.0
11.5
-
-
-
-
-
3
1, 2
1, 2
1, 2
3
tAC1
tCKH2, tCKL2
tCKH1, tCKL2
tCKES
tCKEH
tCKSP
3
tT
Notes:
1. Access time is measured at 1.4V (LVTTL) and VDDQ = 3.3V +10%, -5%. See AC Test Load.
2. 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.
3. Assumes clock rise and fall times are equal to 1ns. If rise or fall time exceeds 1ns, other AC timing parameters must be compensated by an
additional [(trise+tfall)/2 - 1] ns.
Common Parameters
Symbol
Parameter
-6
-7.5
-10
Units
Notes
Min
1.5
0.8
12
30
18
12
12
6
Max
Min
1.5
0.8
15
37.5
22.5
15
15
7.5
2
Max
Min
2.0
1.0
15
45
30
15
15
10
2
Max
tCS
tCH
Command and Address Set-Up Time
Command and Address Hold Time
RAS to CAS Delay Time
Bank Cycle Time
Bank Active Time
-
-
-
-
-
-
-
-
-
-
-
-
ns
ns
ns
ns
ns
ns
ns
ns
clk
tRCD
tRC
tRAS
tRP
tRRD
tCCD
tMRD
120K
120K
120K
Precharge Time
-
-
-
-
-
-
-
-
-
-
-
-
Bank to Bank Delay Time (Alt. Bank)
CAS to CAS Delay Time (Same Bank)
Mode Register Set to Active Delay
2
This is a product in sampling or pre-production phase of development. Charac-
teristic data and other specifications are subject to change without notice.
Enhanced Memory Systems Inc., 1850 Ramtron Dr., Colo Spgs, CO 80921
PHONE: (800) 545-DRAM; FAX: (719) 488-9095; http://www.edram.com
Revision 1.1
Page 19 of 33
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
