GENERAL DESCRIPTION

The 512Mb gDDR2 SDRAM chip is organized as 8Mbit x 16 I/O x 4banks banks device. This synchronous device achieve high speed graphic double-data-rate transfer rates of up to 800Mb/sec/pin for general applications. The chip is designed to comply with the following key gDDR2 SDRAM features such as posted CAS with additive latency, write latency = read latency - 1, Off-Chip Driver(OCD) impedance adjustment and On Die Termination. All of the control and address inputs are synchronized with a pair of externally supplied differential clocks. Inputs are latched at the cross point of differential clocks (CK rising and CK falling). All I/Os are synchronized with a pair of bidirectional strobes (DQS and DQS) in a source synchronous fashion. A thirteen bit address bus is used to convey row, column, and bank address information in a RAS/CAS multiplexing style. For example, 512Mb(x16) device receive 13/10/2 addressing. The 512Mb gDDR2 devices operate with a single 1.8V ± 0.1V power supply and 1.8V ± 0.1V VDDQ. The 512Mb gDDR2 devices are available in 84ball FBGAs(x16). FOR 8M x 16Bit x 4 Bank gDDR2 SDRAM

FEATURES

? 1.8V + 0.1V power supply for device operation

? 1.8V + 0.1V power supply for I/O interface

? 4 Banks operation

? Posted CAS

? Programmable CAS Letency : 3,4,5

? Programmable Additive Latency : 0, 1, 2, 3 and 4

? Write Latency (WL) = Read Latency (RL) -1

? Burst Legth : 4 and 8 (Interleave/nibble sequential)

? Programmable Sequential/ Interleave Burst Mode

? Bi-directional Differential Data-Strobe

(Single-ended data-strobe is an optional feature)

? Off-chip Driver (OCD) Impedance Adjustment

? On Die Termination

? Refresh and Self Refresh

Average Refesh Period 7.8us at lower then TCASE 85×C,

3.9us at 85×C < TCASE < 95 ×C

? Lead Free 84 ball FBGA(RoHS compliant)