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ML4664CH Scheda tecnica(PDF) 3 Page - Micro Linear Corporation |
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ML4664CH Scheda tecnica(HTML) 3 Page - Micro Linear Corporation |
3 / 16 page 3 ML4664/ML4669 PIN NAME FUNCTION 1(29) CTIMER A capacitor from this pin to VCC determines the Link Monitor response time. 2(30) LTF Link Test Fail. Active high. Normally this pin is low, indicating that the link is operational. If the link goes down resulting from the absence of link pulses or frames being received, the chip will go into the Link Test Fail state and bring LTF high. When the ML4664 is in the link test fail state, the optical and twisted pair transmitters are disabled from sending data. However, the optical transmitter does send an idle signal, and link pulses are sent at the twisted pair transmitter. When the ML4669 is in link test fail state, the optical and twisted pair transmitters are disabled from sending data. Also, the optical transmitter will not send an idle signal. However, link pulses may be sent at the twisted pair transmitter, depending on the optical inputs. See Table 1. This pin may be grounded to disable Link Test. In this mode no link pulses are sent and the link will not fail if no link pulses are received. If this pin is not used as an LED driver, and is not grounded, a 2k W 5% resistor should be connected between this pin and VCC. 3(31) TPLED Indicates that reception is taking place on the TPINP, TPINN pair. Active low LED driver, open collector. It is extended 16ms for visibility. Optionally, this pin may be grounded to disable the optical output. If this pin is not used as an LED driver and is not grounded, a 2k W, 5% resistor should be connected between TPLED and VCC. 4(32) TPINP Twisted Pair receive data input. 5(1) TPINN When this signal exceeds the receive squelch requirements the receive data is buffered and sent to the Rx± outputs. 6(3) VCC 5V input 14(12) PIN DESCRIPTION (Pin Number in Parentheses is for TQFP Version) PIN NAME FUNCTION 7(4) TxCAP0 An external capacitor of 680pF is 8(5) TxCAP1 tied between these two pins to set the pulse width for the pre- equalization on the twisted pair transmitter. If these two pins are shorted together, no pre- equalization occurs. If the ML4664/ML4669 is driving only a short cable, or board traces, these pins may be shorted. 9(6) GND Ground reference 20(18) 10(7) TPOUTN Pre-equalized differential balanced 11(8) TPOUTP current driven output. These outputs are connected to a balanced transmit output filter which drives the twisted pair cable through pulse transformers. The output current is set with an external resistor connected to RTSET allowing the chip to drive 100 W unshielded , 150 W shielded twisted pair cables or a range of other characteristic impedances. 12(10) POLDIS Receive Polarity status. Active low LED Driver, open collector output. Indicates the polarity of the receive twisted pair regardless of auto polarity correction. When low, receive polarity is reversed. When high, receive polarity is correct. This pin may be grounded to disable the polarity circuit. If this pin is not used as an LED driver, and is not grounded, a 2k W, 5% resistor should be connected between this pin and VCC. 13(11) RTSETTP When using 100 W unshielded twisted pair, a 220 W resistor is tied between this pin and VCC. When using 150W shielded twisted pair, a 330 W resistor is tied between this pin and VCC. 15(13) RRSET A 1% 61.9k W resistor tied from this pin to VCC is used for internal biasing. 16(14) RTSETOP Sets the current driven output of the transmitter. A 115 W resistor should be tied between this pin and VCC. |
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