Document
Preliminary GS8662S08/09/18/36E-333/300/250/200/167 www.DataSheet4U.com
165-Bump BGA Commercial Temp Industrial Temp Features
• Simultaneous Read and Write SigmaSIO™ Interface • JEDEC-standard pinout and package • Dual Double Data Rate interface • Byte Write controls sampled at data-in time • DLL circuitry for wide output data valid window and future frequency scaling • Burst of 2 Read and Write • 1.8 V +100/–100 mV core power supply • 1.5 V or 1.8 V HSTL Interface • Pipelined read operation • Fully coherent read and write pipelines • ZQ mode pin for programmable output drive strength • IEEE 1149.1 JTAG-compliant Boundary Scan • Pin-compatible with future 144Mb devices • 165-bump, 15 mm x 17 mm, 1 mm bump pitch BGA package • RoHS-compliant 165-bump BGA package available
72Mb Burst of 2 DDR SigmaSIO-II SRAM
333 MHz–167 MHz 1.8 V VDD 1.8 V and 1.5 V I/O
Bottom View
165-Bump, 15 mm x 17 mm BGA 1 mm Bump Pitch, 11 x 15 Bump Array JEDEC Std. MO-216, Variation CAB-1
SigmaRAM™ Family Overview
GS8662S08/09/18/36 are built in compliance with the SigmaSIO-II SRAM pinout standard for Separate I/O synchronous SRAMs. They are 75,497,472-bit (72Mb) SRAMs. These are the first in a family of wide, very low voltage HSTL I/O SRAMs designed to operate at the speeds needed to implement economical high performance networking systems.
Clocking and Addressing Schemes
A Burst of 2 SigmaSIO-II SRAM is a synchronous device. It employs dual input register clock inputs, K and K. The device also allows the user to manipulate the output register clock input quasi independently with dual output register clock inputs, C and C. If the C clocks are tied high, the K clocks are routed internally to fire the output registers instead. Each Burst of 2 SigmaSIO-II SRAM also supplies Echo Clock outputs, CQ and CQ, which are synchronized with read data output. When used in a source synchronous clocking scheme, the Echo Clock outputs can be used to fire input registers at the data’s destination. Because Separate I/O Burst of 2 RAMs always transfer data in two packets, A0 is internally set to 0 for the first read or write transfer, and automatically incremented by 1 for the next transfer. Because the LSB is tied off internally, the address field of a Burst of 2 RAM is always one address pin less than the advertised index depth (e.g., the 4M x 18 has a 1M addressable index).
Parameter Synopsis
- 333 tKHKH tKHQV 3.0 ns 0.45 ns -300 3.3 ns 0.45 ns -250 4.0 ns 0.45 ns -200 5.0 ns 0.45 ns -167 6.0 ns 0.5 ns
Rev: 1.01 9/2005
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© 2005, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Preliminary GS8662S08/09/18/36E-333/300/250/200/167 www.DataSheet4U.com
8M x 8 SigmaQuad SRAM—Top View
1 A B C D E F G H J K L M N P R CQ NC NC NC NC NC NC DOFF NC NC NC NC NC NC TDO 2 SA NC NC D4 NC NC D5 VREF NC NC Q6 NC D7 NC TCK 3 SA NC NC NC Q4 NC Q5 VDDQ NC NC D6 NC NC Q7 SA 4 R/W SA VSS VSS VDDQ VDDQ VDDQ VDDQ VDD.