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SSTUB32866 Datasheet(PDF) 9 Page - NXP Semiconductors |
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SSTUB32866 Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 30 page SSTUB32866_4 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 04 — 15 April 2010 9 of 30 NXP Semiconductors SSTUB32866 1.8 V DDR2-800 configurable registered buffer with parity The device also supports low-power active operation by monitoring both system chip select (DCS and CSR) inputs and will gate the Qn and PPO outputs from changing states when both DCS and CSR inputs are HIGH. If either DCS or CSR input is LOW, the Qn and PPO outputs will function normally. The RESET input has priority over the DCS and CSR control and when driven LOW will force the Qn and PPO outputs LOW, and the QERR output HIGH. If the DCS control functionality is not desired, then the CSR input can be hard-wired to ground, in which case, the set-up time requirement for DCS would be the same as for the other Dn data inputs. To control the low-power mode with DCS only, then the CSR input should be pulled up to VDD through a pull-up resistor. To ensure defined outputs from the register before a stable clock has been supplied, RESET must be held in the LOW state during power-up. In the DDR2 RDIMM application, RESET is specified to be completely asynchronous with respect to CK and CK. Therefore, no timing relationship can be guaranteed between the two. When entering reset, the register will be cleared and the Qn outputs will be driven LOW quickly, relative to the time to disable the differential input receivers. However, when coming out of reset, the register will become active quickly, relative to the time to enable the differential input receivers. As long as the data inputs are LOW, and the clock is stable during the time from the LOW to HIGH transition of RESET until the input receivers are fully enabled, the design of the SSTUB32866 must ensure that the outputs will remain LOW, thus ensuring no glitches on the output. 7.1 Function table [1] Q0 is the previous state of the associated output. Table 4. Function table (each flip-flop) L = LOW voltage level; H = HIGH voltage level; X = don’t care; ↑ = LOW to HIGH transition; ↓ = HIGH to LOW transition. Inputs Outputs[1] RESET DCS CSR CK CK Dn, DODTn, DCKEn Qn QCS QODT, QCKE HL L ↑↓ LL L L HL L ↑↓ HH L H H L L L or H L or H X Q0 Q0 Q0 HL H ↑↓ LL L L HL H ↑↓ HH L H H L H L or H L or H X Q0 Q0 Q0 HH L ↑↓ LL H L HH L ↑↓ HH H H H H L L or H L or H X Q0 Q0 Q0 HH H ↑↓ LQ0 HL HH H ↑↓ HQ0 HH H H H L or H L or H X Q0 Q0 Q0 L X or floating X or floating X or floating X or floating X or floating L L L |
Similar Part No. - SSTUB32866_10 |
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Similar Description - SSTUB32866_10 |
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