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02/10/99
Errata:
CS61584A Revision D
(Reference CS61584A Data Sheet revision DS261PP4 dated JAN `99)
This document is an errata for Revision D of the CS61584A device, and describes the differences between Revision D and the referenced data sheet. Revision E is expected to fully meet the data sheet specifications. 1. Receiver Sensitivity and Loss of Signal (LOS) * Rev D: The receiver sensitivity and LOS thresholds are currently as follows: Sensitivity T1 E1 * -11.5dB -9.2dB LOS -14dB -11dB
Rev E: The receiver sensitivity and LOS thresholds will be as follows: Sensitivity T1 E1 -12dB -12dB LOS -20dB -20dB
2. Quartz Crystal Loading Issue * Rev D: The load presented to the quartz crystal, across the pins 1XCLK/XTALOUT (pins 28/27, TQFP) is around 31pF instead of 19pF. This can make the quartz crystal run at frequencies up to 1.5kHz lower than the nominal 12352/16384kHz frequencies. This results in the device generating frequencies such as RCLK (in the absence of input data and REFCLK/oscillator), or the TAOS signal (blue alarm/all ones), to be up to 160Hz lower than the expected T1/E1 frequencies. A work around is to add series capacitance to the quartz crystal, thus reducing the total loading; or using a crystal which runs at its nominal frequency with a 31pF load, instead of 19pF. Please note that if the REFCLK or an oscillator is being used then this problem does not manifest itself. Rev E: The issue persists in rev E.
*
The device revision is the letter before the 4 digit assembly date code in the second line of the package marking. Inquiries regarding this errata may be directed to Aamir Khan at (800) 888-5016 ext. 3096.
Cirrus Logic P.O. Box 17847, Austin, Texas 78760 (512) 445 7222 FAX: (512) 445 7581 http://www.crystal.com
ER261B2 FEB `99 1

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