SSTU32865

General description

The SSTU32865 is a 1.8 V 28-bit 1:2 register specifically designed for use on two rank by four (2R x 4) and similar high-density Double Data Rate 2 (DDR2) memory modules. It is similar in function to the JEDEC-standard 14-bit DDR2 register, but integrates the functionality of the normally required two registers in a single package, thereby freeing up board real-estate and facilitating routing to accommodate high-density Dual In-line Memory Module (DIMM) designs.

The SSTU32865 also integrates a parity function, which accepts a parity bit from the memory controller, compares it with the data received on the D-inputs and indicates whether a parity error has occurred on its open-drain PTYERR pin (active-LOW).

The SSTU32865 is packaged in a 160-ball, 12 x 18 grid, 0.65 mm ball pitch, thin profile fine-pitch ball grid array (TFBGA) package, which-while requiring a minimum 9 mm x 13 mm of board space-allows for adequate signal routing and escape using conventional card technology.

Features

• 28-bit data register supporting DDR2
• Fully compliant to JEDEC standard JESD82-9
• Supports 2 rank by 4 DIMM density by integrating equivalent functionality of two JEDEC-standard DDR2 registers (i.e. 2 x SSTU32864 or 2 x SSTU32866)
• Parity checking function across 22 input data bits
• Parity out signal
• Controlled output impedance drivers enable optimal signal integrity and speed
• Exceeds JESD82-9 speed performance (1.8 ns max. single-bit switching propagation delay, 2.0 ns max. mass-switching)
• Supports up to 450 MHz clock frequency of operation
• Optimized pinout for high-density DDR2 module design
• Chip-selects minimize power consumption by gating data outputs from changing state
• Supports Stub Series Terminated Logic SSTL_18 data inputs
• Differential clock (CK and CK) inputs
• Supports Low Voltage Complementary Metal Oxide Semiconductor (LVCMOS) switching levels on the control and RESET inputs
• Single 1.8 V supply operation
• Available in 160-ball 9 mm x 13 mm, 0.65 mm ball pitch TFBGA package

Products/packages

Pricing/ordering/availability

Applications

• High-density (e.g. 2 rank by 4) DDR2 registered DIMMs
• DDR2 Registered DIMMs (RDIMM) desiring parity checking functionality

Block diagrams/pinning

Design support

Support Documents

75014354; Memory interface selection guide Support logic for memory modules and other memory subsystems (2005-06-01)

75014345; SSTU32864/5/6 and PCKU877/8 Complete register and PLL solutions for DDR2 (2005-06-01)

Parametrics/similar products

Similar products
SSTU32865 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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