IS42S32800G Datasheet, PDF (1/58 Pages) Integrated Silicon Solution, Inc – 256Mb SYNCHRONOUS DRAM

IS42S32800G
IS45S32800G
8M x 32
256Mb SYNCHRONOUS DRAM
AUGUST 2012
FEATURES
• Clock frequency: 200, 166, 143 MHz
• Fully synchronous; all signals referenced to a
positive clock edge
• Internal bank for hiding row access/precharge
• Single Power supply: 3.3V + 0.3V
• LVTTL interface
• Programmable burst length
– (1, 2, 4, 8, full page)
• Programmable burst sequence:
Sequential/Interleave
• Auto Refresh (CBR)
• Self Refresh
• 4096 refresh cycles every 16ms (A2 grade) or
64 ms (Commercial, Industrial, A1 grade)
• Random column address every clock cycle
• Programmable CAS latency (2, 3 clocks)
• Burst read/write and burst read/single write
operations capability
• Burst termination by burst stop and precharge
command
OPTIONS
• Package:
90-ball TF-BGA
• Operating Temperature Range:
Commercial (0^oC to +70^oC)
Industrial (-40^oC to +85^oC)
Automotive Grade, A1 (-40^oC to +85^oC)
Automotive Grade, A2 (-40^oC to +105^oC)
OVERVIEW
ISSI's 256Mb Synchronous DRAMachieves high-speed
data transfer using pipeline architecture. All inputs and
outputs signals refer to the rising edge of the clock input.
The 256Mb SDRAM is organized in 2Meg x 32 bit x 4
Banks.
KEY TIMING PARAMETERS
Parameter
Clk Cycle Time
CAS Latency = 3
CAS Latency = 2
Clk Frequency
CAS Latency = 3
CAS Latency = 2
Access Timefrom Clock
CAS Latency = 3
CAS Latency = 2
-5
-6
5
6
10
10
200 166
100 100
4.8
5.4
6.5
6.5
-7 Unit
7 ns
7.5 ns
143 Mhz
133 Mhz
5.4 ns
5.5 ns
ADDRESS TABLE
Parameter
Configuration
Refresh Count Com./Ind.
A1
A2
Row Addresses
Column
Addresses
Bank Address
Pins
Autoprecharge
Pins
8M x 32
2M x 32 x 4 banks
4K / 64ms
4K / 64ms
4K / 16ms
A0 – A11
A0 – A8
BA0, BA1
A10/AP
Copyright © 2012 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 arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the lat-
est version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reason-
ably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications
unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. - www.issi.com
1
Rev. A
07/18/2012