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MT57W512H36CF-3.3 PDF预览

MT57W512H36CF-3.3

更新时间: 2023-07-15 00:00:00
品牌 Logo 应用领域
赛普拉斯 - CYPRESS 双倍数据速率静态存储器
页数 文件大小 规格书
28页 404K
描述
DDR SRAM, 512KX36, 0.45ns, CMOS, PBGA165, 13 X 15 MM, 1 MM PITCH, FBGA-165

MT57W512H36CF-3.3 数据手册

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2 MEG X 8, 1 MEG X 18, 512K X 36  
1.8V VDD, HSTL, DDR SIO SRAM  
Depth expansion is accomplished with a single  
device select (LD#), which is received at K rising edge.  
All synchronous inputs pass through registers con-  
trolled by the K or K# input clock rising edges. Active  
LOW byte writes (BWx#) permit byte write or nibble  
write selection. Write data and byte writes are regis-  
tered on the rising edges of both K and K#. The  
addressing within each burst of two is fixed and  
sequential, beginning with the lowest address and  
ending with the highest address. All synchronous data  
outputs pass through output registers controlled by  
the rising edges of the output clocks (C and C# if pro-  
vided, otherwise K, K#).  
Four balls are used to implement JTAG test capabili-  
ties: test mode select (TMS), test data-in (TDI), test  
clock (TCK), and test data-out (TDO). JTAG circuitry is  
used to serially shift data to and from the SRAM. JTAG  
inputs use JEDEC-standard 1.8V I/O levels to shift data  
during this testing mode of operation.  
READ cycles are pipelined. The request is initiated  
by driving R/W# HIGH and providing the address at K  
rising edge. Data is delivered after the next rising edge  
of K# (t + 1), using C and C# as the output timing refer-  
ences; or K and K# if C and C# are tied HIGH. If C and  
C# are tied HIGH, they may not be toggled during  
device operation. Output tri-stating is automatically  
controlled so that the bus is released if no data is being  
delivered. This permits banked SRAM systems with no  
complex output enable (OE) timing generation. Back-  
to-back READ cycles can be initiated at every K rising  
edge.  
WRITE cycles are initiated by driving R/W# LOW  
and providing the address at K rising edge. Data is  
expected at the rising edge of K and K#, beginning at  
the next K rising edge after the cycle is initiated. Write  
registers are incorporated to facilitate pipelined self-  
timed WRITE cycles and to provide fully coherent data  
for all combinations of reads and writes. A read can  
immediately follow a write even if they are to the same  
address. Although the write data has not been written  
to the memory array, the SRAM will deliver the data  
from the write register instead of using the older data  
from the memory array. The latest data is always uti-  
lized for all bus transactions. WRITE cycles can be ini-  
tiated on every K rising edge.  
The SRAM operates from a 1.8V power supply, and  
all inputs and outputs are HSTL-compatible. The  
device is ideally suited for applications that require a  
new transaction to be initiated each clock cycle.  
Please refer to Microns Web site (www.micron.com/  
sramds) for the latest data sheet.  
READ/WRITE Operations  
All bus transactions operate on an uninterruptable  
burst-of-two data and require one full clock cycle of  
bus utilization. Any transaction type can be initiated at  
K rising edge independent of the previous transaction  
type. This permits any random operation without ever  
needing bus turnaround delays.  
PARTIAL WRITE Operations  
BYTE WRITE operations are supported, except for  
x8 devices in which nibble write is supported. The  
active LOW byte write controls, BWx# (NWx#), are reg-  
istered coincident with their corresponding data. This  
feature can eliminate the need for some READ-MOD-  
IFY-WRITE cycles, collapsing it to a single BYTE/NIB-  
BLE WRITE operation in some instances.  
18Mb: 2 Meg x 8, 1 Meg x 18, 512K x 36, 1.8V VDD, HSTL, DDR SIO SRAM  
MT57W1MH18C_H.fm – Rev. H, Pub. 3/03  
Micron Technology, Inc., reserves the right to change products or specifications without notice.  
©2003 Micron Technology, Inc.  
2

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