IS42S32800J
IS45S32800J
8M x 32
256Mb SYNCHRONOUS DRAM
MARCH 2015
FEATURES
• Clock frequency:166, 143, 133 MHz
• Fully synchronous; all signals referenced to a
positive clock edge
• Internal bank for hiding row access/precharge
OVERVIEW
ISSI's 256Mb Synchronous DRAM achieves 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.
• Single Power supply: 3.3V + 0.3V
• LVTTL interface
KEY TIMING PARAMETERS
• Programmable burst length
– (1, 2, 4, 8, full page)
Parameter
• Programmable burst sequence:
Sequential/Interleave
CAS Latency = 3
6
CAS Latency = 2
10
• Auto Refresh (CBR)
Clk Frequency
• Self Refresh
CAS Latency = 3
166
• 4096 refresh cycles every 16ms (A2 grade) or
64 ms (Commercial, Industrial, A1 grade)
CAS Latency = 2
• Random column address every clock cycle
• Programmable CAS latency (2, 3 clocks)
• Burst read/write and burst read/single write
operations capability
-6
-7
-75E
Unit
7
—
ns
10
7.5
ns
143
—
Mhz
100
100
133
Mhz
CAS Latency = 3
5.4
5.4
—
ns
CAS Latency = 2
6.5
6.5
6
ns
Clk Cycle Time
Access Time from Clock
ADDRESS TABLE
• Burst termination by burst stop and precharge
command
Parameter
8M x 32
Configuration
2M x 32 x 4 banks
OPTIONS
Refresh Count
4K / 64ms
A1
4K / 64ms
A2
• Package:
90-ball TF-BGA, 86-pin TSOP2
Com./Ind.
4K / 16ms
Row Addresses
A0 – A11
Column
Addresses
A0 – A8
Bank Address
Pins
BA0, BA1
Autoprecharge
Pins
• Operating Temperature Range:
Commercial (0oC to +70oC)
Industrial (-40oC to +85oC)
Automotive Grade, A1 (-40oC to +85oC)
Automotive Grade, A2 (-40oC to +105oC)
A10/AP
Copyright © 2015 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 latest 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 reasonably 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
3/9/2015
