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TP3410J Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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TP3410J Datasheet(HTML) 2 Page - National Semiconductor (TI) |
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2 / 32 page  Connection Diagrams Pin Names for MICROWIRE Mode TLH9151 – 2 Top View Pin Names for GCI Mode TLH9151 – 3 Top View Order Number TP3410J See NS Package Number J28A Pin Descriptions Pin Symbol Description No 24 GNDA Negative power supply pins which must 9 GNDD1 be connected together close to the de- 23 GNDD2 vice All digital signals are referenced to these pins which are normally at the sys- tem 0V (Ground) potential 5VCCA Positive power supply input for the analog sections which must be a5V g5% and must be directly connected to VCCD 8VCCD Positive power supply input for the digital section which must be a5V g5% and must be directly connected to VCCA 21 MCLK The 1536 MHz Master Clock input which XTAL requires either a parallel resonance crystal to be tied between this pin and XTAL2 or a CMOS logic level clock input from a sta- ble source (a TTL Logic ‘‘1’’ level is not suitable) This clock does not need to be synchronized to the system clock (BCLK and FS) see Section 51 20 XTAL2 The output of the crystal oscillator which should be connected to one end of the crystal if used otherwise this pin must be left open-circuit Not recommended to drive additional logic 10 TSr This pin has 2 functions in LT mode it is SCLK an open-drain n-channel TSr output which goes low only during the time-slots as- signed to the B1 and B2 channels at the Br pin in order to enable the TRI-STATE control of the backplane line-driver In NT mode it is a full CMOS 1536 MHz syn- chronous clock output which is frequency- locked to the received line signal (unlike the XTAL pins it is not free-running) Pin Symbol Description No 22 TSFS The Transmit Superframe Sync pin which indicates the start of each 12 ms transmit superframe at the U Interface In NT mode this pin is always an output In LT mode it may be selected to be either an input or CMOS output via Register CR2 when se- lected as an output the signal is a square- wave Must be tied low if selected as input yet not driven 25 LSD RSFS This pin is an open-drain n-channel Line Signal Detector output which is normally high-impedance and pulls low only when the device is powered down and an incom- ing wake-up signal is detected from the far-end As an option this pin can be pro- grammed to be an output indicating the start of the received superframe at the U interface an external pull-up resistor is re- quired The RSFS signal indicates the start of each 12 ms receive superframe from the U Interface and is available in NT and LT modes The Received Superframe Synch clock output is accessible on pin 25 by writing X’1C04 and X’100C (or X’100E) during device initialization See TP3410 users manual AN-913 Part II Section 418) 1Loa Transmit 2B1Q signal differential outputs 4Lob to the line transformer When used with an appropriate 115 step-up transformer and the line coupling circuit recommended in the Applications section the line signal conforms to the output specifications in the ANSI standard 2 |
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