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GS8170DD36C Datasheet(PDF) 1 Page - GSI Technology

Part # GS8170DD36C
Description  18Mb 誇1x2Lp CMOS I/O Double Data Rate SigmaRAM
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Manufacturer  GSI [GSI Technology]
Direct Link  http://www.gsitechnology.com
Logo GSI - GSI Technology

GS8170DD36C Datasheet(HTML) 1 Page - GSI Technology

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GS8170DD36C-333/300/250/200
18Mb
Σ1x2Lp CMOS I/O
Double Data Rate SigmaRAM™
200 MHz–333 MHz
1.8 V VDD
1.8 V I/O
209-Bump BGA
Commercial Temp
Industrial Temp
Rev: 2.03 1/2005
1/29
© 2002, GSI Technology, Inc.
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Features
• Double Data Rate Read and Write mode
• Late Write; Pipelined read operation
• JEDEC-standard SigmaRAM
pinout and package
• 1.8 V +150/–100 mV core power supply
• 1.8 V CMOS Interface
• ZQ controlled user-selectable output drive strength
• Dual Cycle Deselect
• Burst Read and Write option
• Fully coherent read and write pipelines
• Echo Clock outputs track data output drivers
• 2 user-programmable chip enable inputs
• IEEE 1149.1 JTAG-compliant Serial Boundary Scan
• 209-bump, 14 mm x 22 mm, 1 mm bump pitch BGA package
• Pin-compatible with future 36Mb, 72Mb, and 144Mb
devices
SigmaRAM Family Overview
GS8170DD36 SigmaRAMs are built in compliance with the
SigmaRAM pinout standard for synchronous SRAMs. They
are 18,874,368-bit (18Mb) SRAMs. This family of wide, very
low voltage CMOS I/O SRAMs is designed to operate at the
speeds needed to implement economical high performance
networking systems.
ΣRAMs are offered in a number of configurations including
Late Write, Double Late Write, and Double Data Rate (DDR).
The logical differences between the protocols employed by
these RAMs mainly involve various approaches to write
cueing and data transfer rates. The
ΣRAMfamily standard
allows a user to implement the interface protocol best suited to
the task at hand.
Functional Description
Because SigmaRAMs are synchronous devices, address data
inputs and read/write control inputs are captured on the rising
edge of the input clock. Write cycles are internally self-timed
and initiated by the rising edge of the clock input. This feature
eliminates complex off-chip write pulse generation required by
asynchronous SRAMs and simplifies input signal timing. In
DDR mode the device captures Data In on both rising and
falling edges of clock and drives data on both clock edges as
well.
Because the DDR
ΣRAM always transfers data in two halves,
A0 is internally set to 0 for the first half of each read or write
transfer, and automatically incremented to 1 for the falling
edge transfer. The address field of a DDR
ΣRAM is always
one address pin less than the advertised index depth (e.g., the
512k x 36 has a 512k addressable index).
ΣRAMs support pipelined reads utilizing a rising-edge-
triggered output register. DDR
ΣRAMs incorporate rising-
and falling-edge-triggered output registers. They also utilize a
Dual Cycle Deselect (DCD) output deselect protocol.
ΣRAMs are implemented with high performance CMOS
technology and are packaged in a 209-bump BGA.
Parameter Synopsis
Key Fast Bin Specs
Symbol
- 333
Cycle Time
tKHKH
3.0 ns
Access Time
tKHQV
1.8 ns


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