Internet Data Sheet
HYB18T512161B2F–20/25
512-Mbit Double-Data-Rate-Two SDRAM
1
Overview
This chapter gives an overview of the 512-Mbit Double-Data-Rate-Two SDRAM product family for graphics application and
describes its main characteristics.
1.1
Features
The 512-Mbit Double-Data-Rate-Two SDRAM offers the following key features:
•
•
•
•
1.8 V ± 0.1V VDD for [–20/–25]
1.8 V ± 0.1V VDDQ for [–20/–25]
DRAM organizations with 16 data in/outputs
Double Data Rate architecture:
•
•
Data masks (DM) for write data
Posted CAS by programmable additive latency for better
command and data bus efficiency
•
Off-Chip-Driver impedance adjustment (OCD) and On-
Die-Termination (ODT) for better signal quality.
Auto-Precharge operation for read and write bursts
Auto-Refresh, Self-Refresh and power saving Power-
Down modes
Average Refresh Period 7.8 μs at a TCASE lower than 85
°C, 3.9 μs between 85 °C and 95 °C
Full Strength and reduced Strength (60%) Data-Output
Drivers
– two data transfers per clock cycle
– four internal banks for concurrent operation
Programmable CAS Latency: 3, 4, 5, 6, 7
Programmable Burst Length: 4 and 8
•
•
•
•
•
•
Differential clock inputs (CK and CK)
•
•
Bi-directional, differential data strobes (DQS and DQS) are
transmitted / received with data. Edge aligned with read
data and center-aligned with write data.
DLL aligns DQ and DQS transitions with clock
DQS can be disabled for single-ended data strobe
operation
•
•
•
•
•
2kB page size
Packages: P-TFBGA-84
RoHS Compliant Products1)
•
Commands entered on each positive clock edge, data and
data mask are referenced to both edges of DQS
TABLE 1
Ordering Information for RoHS compliant products
Product Number
Org.
Clock (MHz)
Package
HYB18T512161B2F–20/25
×16
500/400
P-TFBGA-84
1) RoHS Compliant Product: Restriction of the use of certain hazardous substances (RoHS) in electrical and electronic equipment as defined
in the directive 2002/95/EC issued by the European Parliament and of the Council of 27 January 2003. These substances include mercury,
lead, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated biphenyl ethers.
Rev. 1.1, 2007-06
3
05152007-ZYAH-ACMZ
Date: 2008-02-26
QIMONDA [ QIMONDA AG ]
