Edition 2004-04-02
Published by Infineon Technologies AG,
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©
Infineon Technologies AG 5/7/04.
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.
HYB18T256400/800/160AF
DATASHEET Rev. 1.02 (05.04)
Features
•
High Performance:
-5
Speed Sorts
DDR2
-400
-3.7
DDR2
-533
-3S
DDR2
-667
-3
DDR2
-667
256Mb DDR2 SDRAM
Units
tck
MHz
Mb/s/pin
Bin
(CL-tRCD-TRP)
max. Clock
Frequency
Data Rate
CAS Latency (CL)
tRCD
tRP
tRAS
tRC
3-3-3
200
400
3
15
15
40
55
4-4-4
266
533
4
15
15
45
60
5-5-5
4-4-4
333
667
5
15
15
45
60
4
12
12
45
57
tck
ns
ns
ns
ns
• 1.8V ± 0.1V Power Supply
1.8 V ± 0.1V (SSTL_18) compatible) I/O
• DRAM organisations with 4, 8 and 16 data in/outputs
• Double Data Rate architecture: two data transfers per
clock cycle, four internal banks for concurrent operation
• CAS Latency: 3, 4 and 5
• 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
• Commands entered on each positive clock edge, data
and data mask are referenced to both edges of DQS
• 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 7.8µs at a T
CASE
lower than
85
o
C, 3.9µs between 85
o
C and 95
o
C
• Normal and Weak Strength Data-Output Drivers
• 1k page size
• Lead-freePackages:
60 pin FBGA for x4 & x8 components
84 pin FBPA for x16 components
1.0 Description
The 256Mb Double-Data-Rate-2 (DDR2) DRAMs are high-
speed CMOS Double Data Rate 2 Synchronous DRAM
devices containing
268,435,456
bits and are internally config-
ured as a quad-bank DRAMs. The 256Mb chip is organized
as either 16Mbit x 4 I/O x 4 bank, 8Mbit x 8 I/O x 4 bank or
4Mbit x 16 I/O x 4 bank device. These synchronous devices
achieve high speed double-data-rate transfer rates of up to
667 Mb/sec/pin for general applications.
The chip is designed to comply with all key DDR2 DRAM key
features: (1) posted CAS with additive latency, (2) write
latency = read latency -1, (3) normal and weak strength data-
output driver, (4) Off-Chip Driver (OCD) impedance adjust-
ment and (5) an ODT (On-Die Termination) function.
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 single
ended DQS or differential (DQS, DQS) pair in a source
synchronous fashion. A 15 bit address bus is used to con-
vey row, column and bank address information in a RAS /
CAS multiplexing style.
The DDR2 devices operate with a 1.8V +/-0.1V power
supply and are available in FBGA packages.
An Auto-Refresh and Self-Refresh mode is provided along
with various power-saving power-down modes.
The functionality described and the timing specifications
included in this data sheet are for the DLL Enabled mode
of operation.
Page 3
Rainer.Weidlich@Infineon.com
Rev. 1.02
May 2004
INFINEON Technologies
Microchip MCU
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