SSTUB32866_10 Datasheet, PDF (1/30 Pages) NXP Semiconductors – 1.8 V 25-bit 1 : 1 or 14-bit 1 : 2 configurable registered buffer with parity for DDR2-800 RDIMM applications

SSTUB32866
1.8 V 25-bit 1 : 1 or 14-bit 1 : 2 configurable registered buffer
with parity for DDR2-800 RDIMM applications
Rev. 04 — 15 April 2010
Product data sheet
1. General description
The SSTUB32866 is a 1.8 V configurable register specifically designed for use on DDR2
memory modules requiring a parity checking function. The register is configurable (using
configuration pins C0 and C1) to two topologies: 25-bit 1 : 1 or 14-bit 1 : 2, and in the latter
configuration can be designated as Register A or Register B on the DIMM.
The SSTUB32866 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 defined as an even
number of ones across the DIMM-independent data inputs combined with the parity input
bit.
The SSTUB32866 is packaged in a 96-ball, 6 × 16 grid, 0.8 mm ball pitch LFBGA package
(13.5 mm × 5.5 mm).
2. Features and benefits
„ Configurable register supporting DDR2 up to 800 MT/s Registered DIMM applications
„ Configurable to 25-bit 1 : 1 mode or 14-bit 1 : 2 mode
„ Controlled output impedance drivers enable optimal signal integrity and speed
„ Meets or exceeds SSTUB32866 JEDEC standard speed performance
„ 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 SSTL_18 data inputs
„ Checks parity on the DIMM-independent data inputs
„ Partial parity output and input allows cascading of two SSTUB32866s for correct parity
error processing
„ Differential clock (CK and CK) inputs
„ Supports LVCMOS switching levels on the control and RESET inputs
„ Single 1.8 V supply operation (1.7 V to 2.0 V)
„ Available in 96-ball, 13.5 mm × 5.5 mm, 0.8 mm ball pitch LFBGA package
3. Applications
„ 400 MT/s to 800 MT/s DDR2 registered DIMMs desiring parity checking functionality