MT45W4MW16PCGA-70 IT Micron Technology Inc, MT45W4MW16PCGA-70 IT Datasheet - Page 7

• Manufacturer Part Number: MT45W4MW16PCGA-70 IT
• Manufacturer: Micron Technology Inc

Specifications of MT45W4MW16PCGA-70 IT

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Mounting: Surface Mount
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Compliant

Page Mode READ Operation
Figure 7:
LB#/UB# Operation
PDF: 09005aef81f0698d / Source: 09005aef81f06935
64mb_asyncpage_cr1_0_p25z.fm - Rev. D 7/09 EN
Page Mode READ Operation
Page mode is a performance-enhancing extension to the legacy asynchronous READ
operation. In page-mode-capable products, after an initial asynchronous read access is
performed, adjacent addresses can be read quickly by simply changing the low-order
address. Addresses A[3:0] are used to determine the members of the 16-address
CellularRAM page. Any change in addresses A[4] or higher will initiate a new
time. Figure 7 shows the timing for a page mode access. Page mode takes advantage of
the fact that adjacent addresses can be read in a shorter period of time than random
addresses. WRITE operations do not include comparable page mode functionality.
Due to refresh considerations, CE# must not remain LOW longer than
The LB# enable and UB# enable signals support byte-wide data WRITEs. During WRITE
operations, any disabled bytes will not be transferred to the RAM array and the internal
value will remain unchanged. During WRITE cycles, the data to be written is latched on
the rising edge of CE#, WE#, LB#, or UB#, whichever occurs first. LB#/UB# must be LOW
during READ cycles.
When both LB# and UB# are disabled (HIGH) during an operation, the device will
disable the data bus from receiving or transmitting data. Although the device will seem
to be deselected, it remains in an active mode as long as CE# remains LOW.
ADDRESS
LB#/UB#
DATA
WE#
OE#
CE#
Add 0
t AA
64Mb: 4 Meg x 16 Async/Page CellularRAM 1.0
7
D0
t APA
Add 1 Add 2 Add 3
t CEM
Micron Technology, Inc., reserves the right to change products or specifications without notice.
D1
t APA
D2
t APA
D3
Don’t Care
Bus Operating Modes
©2005 Micron Technology, Inc. All rights reserved.
t
CEM.
t
AA access