MT45W1ML16PAFA-70 WT Micron Technology Inc, MT45W1ML16PAFA-70 WT Datasheet - Page 25

• Manufacturer Part Number: MT45W1ML16PAFA-70 WT
• Manufacturer: Micron Technology Inc

Specifications of MT45W1ML16PAFA-70 WT

• Operating Temperature (max): 85C
• Mounting: Surface Mount
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Not Compliant

APPENDIX A
How Extended Timings Impact
CellularRAM
Introduction
that periodically requires refresh to ensure against
data corruption. CellularRAM devices include on-chip
circuitry that performs the required refresh in a man-
ner that is completely transparent in systems with nor-
mal bus timings. The refresh circuitry does impose
constraints on timings in systems that take longer than
10µs to complete operations. This appendix describes
CellularRAM timing requirements in systems that per-
form extended operations. Table 25 below summarizes
this information.
WRITE Operation
page 15 require that all WRITE operations must be
completed within 10µs. After completing a WRITE
operation, the device must either enter standby (by
transitioning CE# HIGH), or else perform a second
operation (READ or WRITE) using a new address. Fig-
ures 22 and 23 demonstrate these constraints as they
apply during an asynchronous (page-mode-disabled)
operation. Either the CE# active period (
Figure 22) or the address valid period (
Figure 23) must be less than 10µs during any WRITE
operation, otherwise, the extended WRITE timings
must be used.
Table 25: Extended Cycle Impact on READ and WRITE Cycles
09005aef80d481d3
AsyncCellularRAM_16_32.fm - Rev. A 2/18/04 EN
Disabled
Enabled
PAGE MODE
CellularRAM products use a DRAM technology
The timing parameters provided in Table 14 on
TM
(See Figures 22 and 23 above.)
Operation
TIMING CONSTRAINT
(See Figure 22 above.)
t
CEM and
t
CEM > 10µs
t
TM > 10µs
t
CEM in
t
TM in
ASYNC/PAGE CellularRAM MEMORY
25
READ CYCLE
No impact.
Figure 22: Extended Timing for
Figure 23: Extended Timing for
Micron Technology, Inc., reserves the right to change products or specifications without notice.
ADDRESS
ADDRESS
CE#
CE#
2 MEG x 16, 1 MEG x 16
Not allowed.
Must use extended WRITE timing.
(See Figure 24 on page 26.)
t
t
TM
CEM
©2004 Micron Technology, Inc. All Rights Reserved.
<
<
10 s
WRITE CYCLE
10µs
ADVANCE
t
CEM
t
TM