IBM11N1645L
IBM11N1735Q
1M x 64/72 DRAM Module
AC Characteristics (TA = 0 to +70°C, VCC = 3.3V ± 0.3V)
1. VIH (min) and VIL (max) are reference levels for measuring timing of input signals. Transition times are measured between VIH and
VIL.
2. An initial pause of 200µs is required after power-up followed by 8 RAS only refresh cycles before proper device operation is
achieved. In case of using internal refresh counter, a minimum of 8 CAS before RAS refresh cycles instead of 8 RAS only refresh
cycles is required..
3. AC measurements assume tT = 2ns.
.
Read, Write, Read-Modify-Write and Refresh Cycles (Common Parameters)
-60
-6R
-70
Symbol
Parameter
Unit
Notes
Min
104
40
10
60
10
0
Max
—
Min
104
40
10
60
10
0
Max
—
Min
124
50
10
70
12
0
Max
—
tRC
tRP
Random Read or Write Cycle Time
RAS Precharge Time
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
—
—
—
tCP
CAS Precharge Time
—
—
—
tRAS
tCAS
tASR
tRAH
tASC
tCAH
tRCD
tRAD
tRSH
tCSH
tCRP
tODD
tDZO
tDZC
tT
RAS Pulse Width
10K
10K
—
10K
10K
—
10K
10K
—
CAS Pulse Width
Row Address Setup Time
Row Address Hold Time
Column Address Setup Time
Column Address Hold Time
RAS to CAS Delay Time
RAS to Column Address Delay Time
RAS Hold Time
10
0
—
10
0
—
10
0
—
—
—
—
10
14
12
10
50
5
—
10
14
12
10
50
5
—
10
14
12
12
55
5
—
45
30
—
43
30
—
50
35
—
1
2
CAS Hold Time
—
—
—
CAS to RAS Precharge Time
OE to DIN Delay Time
—
—
—
15
0
—
15
0
—
15
0
—
3
4
4
OE Delay Time from DIN
CAS Delay Time from DIN
Transition Time (Rise and Fall)
—
—
—
0
—
0
—
0
—
2
30
2
30
2
30
1. Operation within the tRCD(max) limit ensures that tRAC(max) can be met. The tRCD(max) is specified as a reference point only: If
tRCD is greater than the specified tRCD(max) limit, then access time is controlled by tCAC.
2. Operation within the tRAD(max) limit ensures that tRAC(max) can be met. The tRAD(max) is specified as a reference point only: If
tRAD is greater than the specified tRAD(max) limit, then access time is controlled by tAA.
3. Either tCDD or tODD must be satisfied.
4. Either tDZC or tDZO must be satisfied.
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
50H8035
SA14-4630-02
Revised 5/96
Page 8 of 33
IBM [ IBM ]
