GS8342TT06/11/20/38BD-550/500/450/400/350
165-Bump BGA
Commercial Temp
Industrial Temp
Features
• 2.5 Clock Latency
• Simultaneous Read and Write SigmaDDR
TM
Interface
• JEDEC-standard pinout and package
• Double Data Rate interface
• Byte Write controls sampled at data-in time
• Burst of 2 Read and Write
• Dual-Range On-Die Termination (ODT) on Data (D), Byte
Write (BW), and Clock (K, K) inputs
• 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
• Data Valid Pin (QVLD) Support
• IEEE 1149.1 JTAG-compliant Boundary Scan
• 165-bump, 13 mm x 15 mm, 1 mm bump pitch BGA package
• RoHS-compliant 165-bump BGA package available
36Mb SigmaDDR
TM
-II+
Burst of 2 SRAM
550 MHz–350 MHz
1.8 V V
DD
1.8 V or 1.5 V I/O
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 GS8342TT06/11/20/38BD 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.
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. Therefore the address field of a
SigmaDDR-II+ B2 RAM is always one address pin less than
the advertised index depth (e.g., the 4M x 8 has a 2M
addressable index).
SigmaDDR-II™ Family Overview
The GS8342TT06/11/20/38BD are built in compliance with
the SigmaDDR-II+ SRAM pinout standard for Common I/O
synchronous SRAMs. They are 37,748,736-bit (36Mb)
SRAMs. The GS8342TT06/11/20/38BD SigmaDDR-II+
Parameter Synopsis
-550
tKHKH
tKHQV
1.81 ns
0.45 ns
-500
2.0 ns
0.45 ns
-450
2.2 ns
0.45 ns
-400
2.5 ns
0.45 ns
-350
2.86 ns
0.45 ns
Rev: 1.01 6/2012
1/30
© 2011, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
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