GS8662Q18BD-300M Datasheet, PDF (1/32 Pages) GSI Technology – 72Mb SigmaQuad-IITM Burst of 2 SRAM

GS8662Q08/09/18/36BD-300M
165-Bump BGA
Military Temp
72Mb SigmaQuad-II^TM
Burst of 2 SRAM
300 MHz
1.8 V V_DD
1.8 V and 1.5 V I/O
Features
Clocking and Addressing Schemes
• Military Temperature Range
• Simultaneous Read and Write SigmaQuad™ Interface
• JEDEC-standard pinout and package
• Dual Double Data Rate interface
• Byte Write controls sampled at data-in time
• 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 pin for programmable output drive strength
• IEEE 1149.1 JTAG-compliant Boundary Scan
• Pin-compatible with present 144 Mb devices
• 165-bump, 13 mm x 15 mm, 1 mm bump pitch BGA package
SigmaQuad™ Family Overview
The GS8662Q08/09/18/36BD are built in compliance with
the SigmaQuad-II SRAM pinout standard for Separate I/O
synchronous SRAMs. They are 75,497,472-bit (72Mb)
SRAMs. The GS8662Q08/09/18/36BD SigmaQuad SRAMs
are just one element in a family of low power, low voltage
HSTL I/O SRAMs designed to operate at the speeds needed to
implement economical high performance networking systems.
The GS8662Q08/09/18/36BD SigmaQuad-II SRAMs are
synchronous devices. They employ two input register clock
inputs, K and K. K and K are independent single-ended clock
inputs, not differential inputs to a single differential clock input
buffer. The device also allows the user to manipulate the
output register clock inputs quasi independently with the C and
C clock inputs. C and C are also independent single-ended
clock inputs, not differential inputs. If the C clocks are tied
high, the K clocks are routed internally to fire the output
registers instead.
Each internal read and write operation in a SigmaQuad-II B2
RAM is two times wider than the device I/O bus. An input data
bus de-multiplexer is used to accumulate incoming data before
it is simultaneously written to the memory array. An output
data multiplexer is used to capture the data produced from a
single memory array read and then route it to the appropriate
output drivers as needed. Therefore the address field of a
SigmaQuad-II B2 RAM is always one address pin less than the
advertised index depth (e.g., the 8M x 8 has an 4M addressable
index).
Parameter Synopsis
tKHKH
tKHQV
-300M
3.3 ns
0.45 ns
Rev: 1.00 10/2012
1/32
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2012, GSI Technology