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IS61LPS51218A-250TQ PDF预览

IS61LPS51218A-250TQ

更新时间: 2024-09-17 04:58:35
品牌 Logo 应用领域
美国芯成 - ISSI /
页数 文件大小 规格书
32页 209K
描述
256K x 36, 512K x 18 9 Mb SYNCHRONOUS PIPELINED, SINGLE CYCLE DESELECT STATIC RAM

IS61LPS51218A-250TQ 数据手册

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®
IS61VPS25636A IS61LPS25636A  
IS61VPS51218A IS61LPS51218A  
ISSI  
256K x 36, 512K x 18  
MAY 2005  
9 Mb SYNCHRONOUS PIPELINED,  
SINGLE CYCLE DESELECT STATIC RAM  
DESCRIPTION  
FEATURES  
The ISSI IS61LPS/VPS25636A and IS61LPS/  
VPS51218Aarehigh-speed,low-powersynchronousstatic  
RAMsdesignedtoprovideburstable,high-performancememory  
for communication and networking applications. The  
IS61LPS/VPS25636A is organized as 262,144 words by  
36 bits and the IS61LPS/VPS51218A is organized as  
524,288 words by 18 bits. Fabricated with ISSI's ad-  
vanced CMOS technology, the device integrates a 2-bit  
burst counter, high-speed SRAM core, and high-drive  
capability outputs into a single monolithic circuit. All  
synchronous inputs pass through registers controlled by  
a positive-edge-triggered single clock input.  
• Internal self-timed write cycle  
• Individual Byte Write Control and Global Write  
• Clock controlled, registered address, data and  
control  
• Burst sequence control using MODE input  
• Three chip enable option for simple depth  
expansion and address pipelining  
• Common data inputs and data outputs  
• Auto Power-down during deselect  
• Single cycle deselect  
Write cycles are internally self-timed and are initiated by  
therisingedgeoftheclockinput. Writecyclescanbeone  
tofourbyteswideascontrolledbythewritecontrolinputs.  
• Snooze MODE for reduced-power standby  
• JTAG Boundary Scan for PBGA package  
• Power Supply  
Separatebyteenablesallowindividualbytestobewritten.  
The byte write operation is performed by using the byte  
write enable (BWE) input combined with one or more  
individual byte write signals (BWx). In addition, Global  
Write (GW) is available for writing all bytes at one time,  
regardless of the byte write controls.  
LPS: VDD 3.3V + 5%, VDDQ 3.3V/2.5V + 5%  
VPS: VDD 2.5V + 5%, VDDQ 2.5V + 5%  
Bursts can be initiated with either ADSP (Address Status  
Processor) or ADSC (Address Status Cache Controller)  
inputpins.Subsequentburstaddressescanbegenerated  
internally and controlled by the ADV (burst address  
advance) input pin.  
• JEDEC 100-Pin TQFP, 119-ball PBGA, and  
165-ball PBGA packages  
• Lead-free available  
The mode pin is used to select the burst sequence order,  
Linear burst is achieved when this pin is tied LOW.  
Interleave burst is achieved when this pin is tied HIGH or  
left floating.  
FAST ACCESS TIME  
Symbol  
tKQ  
Parameter  
250  
2.6  
4
200  
3.1  
5
Units  
ns  
Clock Access Time  
Cycle Time  
tKC  
ns  
Frequency  
250  
200  
MHz  
Copyright © 2005 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability  
arisingoutoftheapplicationoruseofanyinformation, productsorservicesdescribedherein. Customersareadvisedtoobtainthelatestversionofthisdevicespecificationbeforerelyingonany  
publishedinformationandbeforeplacingordersforproducts.  
Integrated Silicon Solution, Inc. — 1-800-379-4774  
Rev. A  
1
04/29/05  

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