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SN74SSTUB32866 Scheda tecnica(PDF) 1 Page - Texas Instruments |
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SN74SSTUB32866 Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 39 page 1 FEATURES DESCRIPTION SN74SSTUB32866 SCAS792C – OCTOBER 2006 – REVISED NOVEMBER 2007 www.ti.com 25-BIT CONFIGURABLE REGISTERED BUFFER WITH ADDRESS-PARITY TEST • Supports SSTL_18 Data Inputs 2 • Member of the Texas Instruments Widebus+™ • Differential Clock (CLK and CLK) Inputs Family • Supports LVCMOS Switching Levels on the • Pinout Optimizes DDR2 DIMM PCB Layout Control and RESET Inputs • Configurable as 25-Bit 1:1 or 14-Bit 1:2 • Checks Parity on DIMM-Independent Data Registered Buffer Inputs • Chip-Select Inputs Gate the Data Outputs from • Able to Cascade with a Second Changing State and Minimizes System Power SN74SSTUB32866 Consumption • Supports Industrial Temperature Range • Output Edge-Control Circuitry Minimizes (-40 °C to 85°C) Switching Noise in an Unterminated Line This 25-bit 1:1 or 14-bit 1:2 configurable registered buffer is designed for 1.7-V to 1.9-V VCC operation. In the 1:1 pinout configuration, only one device per DIMM is required to drive nine SDRAM loads. In the 1:2 pinout configuration, two devices per DIMM are required to drive 18 SDRAM loads. All inputs are SSTL_18, except the reset (RESET) and control (Cn) inputs, which are LVCMOS. All outputs are edge-controlled circuits optimized for unterminated DIMM loads and meet SSTL_18 specifications, except the open-drain error (QERR) output. The SN74SSTUB32866 operates from a differential clock (CLK and CLK). Data are registered at the crossing of CLK going high and CLK going low. The SN74SSTUB32866 accepts a parity bit from the memory controller on the parity bit (PAR_IN) input, compares it with the data received on the DIMM-independent D-inputs (D2–D3, D5–D6, D8–D25 when C0 = 0 and C1 = 0; D2–D3, D5–D6, D8–D14 when C0 = 0 and C1 = 1; or D1-D6, D8-D13 when C0 = 1 and C1 = 1) and indicates whether a parity error has occurred on the open-drain QERR pin (active low). The convention is even parity; i.e., valid parity is defined as an even number of ones across the DIMM-independent data inputs, combined with the parity input bit. To calculate parity, all DIMM-independent data inputs must be tied to a known logic state. When used as a single device, the C0 and C1 inputs are tied low. In this configuration, parity is checked on the PAR_IN input signal, which arrives one cycle after the input data to which it applies. Two clock cycles after the data are registered, the corresponding partial-parity-out (PPO) and QERR signals are generated. When used in pairs, the C0 input of the first register is tied low, and the C0 input of the second register is tied high. The C1 input of both registers are tied high. Parity, which arrives one cycle after the data input to which it applies, is checked on the PAR_IN input signal of the first device. Two clock cycles after the data are registered, the corresponding PPO and QERR signals are generated on the second device. The PPO output of the first register is cascaded to the PAR_IN of the second SN74SSTUB32866. The QERR output of the first SN74SSTUB32866 is left floating, and the valid error information is latched on the QERR output of the second SN74SSTUB32866. ORDERING INFORMATION TA PACKAGE(1) ORDERABLE PART NUMBER TOP-SIDE MARKING LFBGA–ZKE Tape and reel SN74SSTUB32866ZKER SB866 -40 °C to 85°C LFBGA–ZWL Tape and reel SN74SSTUB32866ZWLR SB866 (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 Widebus+ is a trademark of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright © 2006–2007, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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