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843442AGILFT Datasheet(PDF) 1 Page - Integrated Device Technology |
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843442AGILFT Datasheet(HTML) 1 Page - Integrated Device Technology |
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1 / 14 page  DATA SHEET 843442AG REVISION B 08/21/2015 1 ©2015 Integrated Device Technology, Inc. FemtoClock™ SAS/SATA Clock Generator 843442 General Description The 843442 is a low jitter, high performance clock generator. The 843442 is designed for use in applications using the SAS and SATA interconnect. The 843442 uses an external, 25MHz, parallel resonant crystal to generate two selectable output frequencies: 75MHz and 150MHz. This silicon based approach provides excellent frequency stability and reliability. The 843442 features down and center spread spectrum (SSC) clocking techniques. Applications • SAS/SATA Host Bus Adapters • SATA Port Multipliers • SAS I/O Controllers • TapeDrive and HDD Array Controllers • SAS Edge and Fanout Expanders • HDDs and TapeDrives • Disk Storage Enterprise Features • Designed for use in SAS, SAS-2, and SATA systems • Center (±0.25%) Spread Spectrum Clocking (SSC) • Down (-0.23% or -0.5%) SSC • Two differential 3.3V LVPECL output pairs • Crystal oscillator interface designed for 25MHz (C L = 18pF) frequency • External fundamental crystal frequency ensures high reliability and low aging • Selectable output frequencies: 75MHz, 150MHz • Output frequency is tunable with external capacitors • RMS phase jitter at 150MHz (integrated from 12kHz to 20MHz): 1.07ps (typical) • 3.3V operating supply • -40°C to 85°C ambient operating temperature • Available in lead-free (RoHS 6) package • Functional replacement part: 843002AYLF Block Diagram Pin Assignment 843442 16-Lead TSSOP 4.4mm x 5.0mm x 0.925mm package body G Package Top View OSC Q0 nQ0 XTAL_IN XTAL_OUT 25MHz SSC_SEL[1:0] nPLL_SEL Q1 nQ1 FemtoClock™ PLL Clock Output Control Logic 0 1 Pulldown Pulldown F_SEL Pullup 0 = 75MHz 1 = 150MHz (default) 2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 SSC_SEL1 nc nc nc SSC_SEL0 XTAL_IN XTAL_OUT VEE F_SEL VEE nPLL_SEL nQ0 Q0 nQ1 Q1 VCC |
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