IBM014405M IBM014405
IBM014405P IBM014405B
1M x 4 10/10 EDO DRAM
AC Characteristics (T =0 to +70°C)
A
1. An initial pause of 100µs is required after power-up followed by 8 RAS only refresh cycles or 8 CAS before RAS refresh cycles.
2. AC measurements assume tT=2ns.
3. VIH(min) and VIL(max) are reference levels for measuring timing of input signals. Also, transition times are measured between VIH
and VIL (or between VIL and VIH).
4. In addition to meeting the transition rate specification, all input signals must transit between VIH and VIL (or between VIL and VIH) in
a monotonic manner.
5. If OE is tied permanently low, Late-Write or Read-Modify-Write operations are not possible.
6. If both RAS and CAS = VIH, then the data I/O’s will be high impedance.
7. If CAS = VIL, then the data I/O’s may contain data from the last valid Read cycle.
8. Measured with a load equivalent to 2 TTL loads and 100pF.
Read, Write, Read-Modify-Write and Ref. Cycles (Common Parameters)
-60
-70
Symbol
Parameter
Units
Notes
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
—
—
1
tRAS
tCAS
tASR
tRAH
tASC
tCAH
tRCD
tRAD
tRSH
tCSH
tCRP
tOED
tDZO
tDZC
tT
RAS Pulse Width
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
14
12
10
50
5
—
10
14
12
12
55
5
—
45
30
—
50
35
—
2
3
CAS Hold Time
—
—
CAS to RAS Precharge Time
OE to DIN Delay Time
—
—
15
0
—
15
0
—
4
5
5
6
OE Delay Time From DIN
CAS Delay Time From DIN
Transition Time (Rise and Fall)
—
—
0
—
0
—
2
30
2
30
1. If CAS is Low at the falling edge of RAS, data will be maintained from the previous cycle. To initiate a new cycle and clear the I/O
buffers, CAS must be pulsed High for tCP
2. Operation within the tRCD(max) limit ensures that tRAC(max) can be met. 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
3. Operation within the tRAD(max) limit ensures that tRAC(max) can be met. 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
4. Either tCDD or tOED must be satisfied.
.
5. Either tDZC or tDZO must be satisfied.
6. AC measurements assume tT=2ns.
©IBM Corporation, 1996. All rights reserved.
Use is further subject to the provisions at the end of this document.
27H6242
SA14-4232-03
Revised 6/96
Page 6 of 29
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