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SSTUP32866 Datasheet, PDF (1/31 Pages) NXP Semiconductors – 1.8 V 25-bit 1 : 1 or 14-bit 1 : 2 configurable registered buffer with parity and programmable output for DDR2-800 RDIMMs | |||
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SSTUP32866
1.8 V 25-bit 1 : 1 or 14-bit 1 : 2 conï¬gurable registered buffer
with parity and programmable output for DDR2-800 RDIMMs
Rev. 02 â 14 September 2006
Product data sheet
1. General description
The SSTUP32866 is a 1.8 V conï¬gurable register speciï¬cally designed for use on DDR2
memory modules requiring a parity checking function. It is deï¬ned in accordance with the
JEDEC standard for the SSTUA32866 and SSTUB32866 registered buffers. The register
is conï¬gurable (using conï¬guration pins C0 and C1) to two topologies: 25-bit 1 : 1 or
14-bit 1 : 2, and in the latter conï¬guration can be designated as Register A or Register B
on the DIMM. It offers added features over the JEDEC standard register in that it can be
conï¬gured for high or normal output drive strength, as well as for operation to 667 MT/s or
800 MT/s, simply by tying two input pins HIGH or LOW as needed.
The SSTUP32866 accepts a parity bit from the memory controller on its parity bit
(PAR_IN) input, compares it with the data received on the DIMM-independent D-inputs
and indicates whether a parity error has occurred on its open-drain QERR pin
(active LOW). The convention is even parity, that is, valid parity is deï¬ned as an even
number of ones across the DIMM-independent data inputs combined with the parity input
bit.
The SSTUP32866 is packaged in a 96-ball, 6 Ã 16 grid, 0.8 mm ball pitch LFBGA
package (13.5 mm à 5.5 mm).
2. Features
I Conï¬gurable register supporting DDR2 up to 667 MT/s or 800 MT/s Registered DIMM
applications
I Conï¬gurable to 25-bit 1 : 1 mode or 14-bit 1 : 2 mode
I Programmable for normal or high output drive
I Controlled multi-impedance output drivers enable optimal signal integrity and speed
I Programmable for 667 MT/s or 800 MT/s speed
I Excellent propagation delay performance
I Supports up to 450 MHz clock frequency of operation
I Optimized pinout for high-density DDR2 module design
I Chip-selects minimize power consumption by gating data outputs from changing state
I Supports SSTL_18 data inputs
I Checks parity on the DIMM-independent data inputs
I Partial parity output and input allows cascading of two SSTUP32866s for correct parity
error processing
I Differential clock (CK and CK) inputs
I Supports LVCMOS switching levels on the control and RESET inputs
I Single 1.8 V supply operation (1.7 V to 2.0 V)
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