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GS81302T09E-250 Arkusz danych(PDF) 1 Page - GSI Technology

Numer części GS81302T09E-250
Szczegółowy opis  144Mb SigmaDDRTM-II Burst of 2 SRAM
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Producent  GSI [GSI Technology]
Strona internetowa  http://www.gsitechnology.com
Logo GSI - GSI Technology

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GS81302T08/09/18/36E-375/350/333/300/250
144Mb SigmaDDRTM-II
Burst of 2 SRAM
375 MHz–250 MHz
1.8 V VDD
1.8 V and 1.5 V I/O
165-Bump BGA
Commercial Temp
Industrial Temp
Rev: 1.03b 12/2011
1/35
© 2011, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Features
• Simultaneous Read and Write SigmaDDR™ Interface
• Common I/O bus
• JEDEC-standard pinout and package
• Double Data Rate interface
• Byte Write (x36 and x18) and Nybble Write (x8) function
• 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 with self-timed Late Write
• Fully coherent read and write pipelines
• ZQ pin for programmable output drive strength
• IEEE 1149.1 JTAG-compliant Boundary Scan
• Pin-compatible with present 9Mb, 18Mb, 36Mb and 72Mb
devices
• 165-bump, 15 mm x 17 mm, 1 mm bump pitch BGA package
• RoHS-compliant 165-bump BGA package available
SigmaDDR™ Family Overview
The GS81302T08/09/18/36E are built in compliance with the
SigmaDDR-II SRAM pinout standard for Common I/O
synchronous SRAMs. They are 150,994,944-bit (144Mb)
SRAMs. The GS81302T08/09/18/36E SigmaDDR-II 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.
Clocking and Addressing Schemes
The GS81302T08/09/18/36E SigmaDDR-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 SigmaDDR-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.
When a new address is loaded into a x18 or x36 version of the
part, A0 is used to initialize the pointers that control the data
multiplexer / de-multiplexer so the RAM can perform "critical
word first" operations. From an external address point of view,
regardless of the starting point, the data transfers always follow
the same sequence {0, 1} or {1, 0} (where the digits shown
represent A0).
Unlike the x18 and x36 versions, the input and output data
multiplexers of the x8 and x9 versions are not preset by
address inputs and therefore do not allow "critical word first"
operations. The address fields of the x8 and x9 SigmaDDR-II
B2 RAMs are one address pin less than the advertised index
depth (e.g., the 16M x 8 has an 8M addressable index, and A0
is not an accessible address pin).
Parameter Synopsis
-375
-350
-333
-300
-250
tKHKH
2.66 ns
2.86 ns
3.0 ns
3.3 ns
4.0 ns
tKHQV
0.45 ns
0.45 ns
0.45 ns
0.45 ns
0.45 ns


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