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GS8640V18/32/36T-300/250/200/167

100-Pin TQFPCommercial TempIndustrial TempFeatures

operation

Single Cycle Deselect (SCD) operation 1.8 V +10%/–10% core power supply 1.8 V I/O supply

Internal input resistors on mode pins allow floating mode pins Default to Interleaved Pipeline mode

Internal self-timed write cycle

Automatic power-down for portable applications JEDEC-standard 100-lead TQFP package Pb-Free 100-lead TQFP package available

4M x 18, 2M x 32, 2M x 3672Mb Sync Burst SRAMs300 MHz–167 MHz

1.8 V VDD1.8 V I/O

Burst mode, subsequent burst addresses are generated counter may be configured to count in either linear or

Burst function need not be used. New addresses can be loaded on every cycle with no degradation of chip performance.Flow Through/Pipeline Reads

The function of the Data Output register can be controlled by pin low places the RAM in Flow Through mode, causing high places the RAM in Pipeline mode, activating the rising-edge-triggered Data Output Register.

Byte Write and Global Write

Byte write operation is performed by using Byte Write enable writing all bytes at one time, regardless of the Byte Write control inputs.

Sleep Mode

Low power (Sleep mode) is attained through the assertion (High) of the ZZ signal, or by stopping the clock (CK). Memory data is retained during Sleep mode.

Core and Interface Voltages

The GS8640V18/32/36T operates on a 1.8 V power supply. All input are 1.8 V compatible. Separate output power (VDDQ) pins are used to decouple output noise from the internal circuits and are 1.8 V compatible.

Functional Description

Applications

The GS8640V18/32/36T is a 75,497,472-bit high performance synchronous SRAM with a 2-bit burst address counter. Although of a type originally developed for Level 2 Cache applications supporting high performance CPUs, the device now finds application in synchronous SRAM applications, ranging from DSP main store to networking chip set support. Controls

and power down control (ZZ) are asynchronous inputs. Burst

Parameter Synopsis

KQtCycle(x18)Curr (x32/x36)

KQtCycle(x18)Curr (x32/x36)

-3003.34805.5330

-2504.04106.5280

-2005.03507.5250

-1676.03058.0240

UnitnsmAnsmA

Pipeline3-1-1-1

Flow Through2-1-1-1