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MH89770 Datasheet(PDF) 2 Page - Mitel Networks Corporation |
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MH89770 Datasheet(HTML) 2 Page - Mitel Networks Corporation |
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2 / 36 page  4-126 MH89770 Preliminary Information Figure 2 - Pin Connections Pin Description Pin # Name Description 2NC No Connection. 3E1.5o 1.544 MHz Extracted Clock (Output): This clock is extracted by the device from the received DS1 signal. It is used internally to clock in data received at RxT and RxR. 4VDD System Power Supply. +5V. 5RxA Received A (Output): The bipolar DS1 signal received by the device at RxR and RxT is converted to a unipolar format and output at this pin. 6 7 RxT RxR Receive Tip and Ring Inputs: Bipolar split phase inputs designed to be connected directly to the input transformer. Impedance to ground is approximately 1k Ω. Impedance between pins=430 Ω. 8RxB Received B (Output): The bipolar DS1 signal received by the device at RxR and RxT is converted to a unipolar format and output at this pin. 9NC No Connection. 10 CSTi1 Control ST-BUS Input #1: A 2048 kbit/s serial control stream which carries 24 per-channel control words. 11 CSTi0 Control ST-BUS Input #0: A 2048 kbit/s serial control stream that contains 24 per channel control words and two master control words. 12 E8Ko 8 kHz Extracted Clock (Output): This is an 8 kHz output generated by dividing the extracted 1.544 MHz clock by 193 and aligning it with the received DS1 frame. The 8 kHz signal can be used for synchronizing system clocks to the extracted 1.544 MHz clock. When digital loopback is enabled, the 8kHz is derived from C1.5. 13 XCtl External Control (Output): This is an uncommitted external output pin which is set or reset via bit 3 in Master Control Word 1 on CSTi0. The state of XCtl is updated once per frame. 14 XSt External Status (Schmitt Trigger Input): The state of this pin is sampled once per frame and the status is reported in bit 5 of Master Status Word 2 on CSTo. 15 CSTo Control ST-BUS Output: This is a 2048 kbit/s serial control stream which provides the 24 per-channel status words, and two master status words. 16 NC No Connection. NC LOS NC TxFDL NC TxFDLClk VSS RxFDLClk DSTo RxFDL OUTB C1.5i RxSF TxSF OUTA NC NC NC VSS NC NC E1.5o VDD RxA RxT RxR RxB NC CSTi1 CSTi0 E8Ko XCtl XSt CSTo NC DSTi C2i E1.5o F0i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 |
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