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ML4667 Datasheet(PDF) 3 Page - Micro Linear Corporation |
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ML4667 Datasheet(HTML) 3 Page - Micro Linear Corporation |
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3 / 12 page  3 ML4667 PIN NAME FUNCTION 19 NC/PEAK Normally this pin can be left floating. (tying it to GND or VCC is OK too.) Some fiber optic LEDs may need an additional peaking circuit to speed-up the rise and fall times. For this case, tie pin 19 (NC/PEAK) to pin 18 (TxOUT). When using the HP HFBR 1414, let pin 19 float. Using the peaking circuit may deteriorate optical overshoot and undershoot. 20 GND Ground reference. 21 GND Ground reference. 22 LMONIN Link Monitor Input from the ML4622 or ML4624. This input must be low (active) for the receiver to unsquelch. 23 LBDIS Loopback Disable. When this pin is tied to VCC, the AUI transmit pair data is not looped back to the AUI receive pair, and collision is disabled. When this pin is tied to GND (normal operation), the AUI transmit pair data is looped back to the AUI receiver pair. 24 LMON Link Monitor LED status output. This pin is pulled low when LMONIN is low and there are transitions on RxIN ± indicating and idle signal or active data. If either LMONIN goes high or transitions cease on RxIN ±, LMON will go high, Active low LED driver, open collector. 25 RxIN– Fiber optic receive pair. This ECL 26 RXIN+ level signal is received from the ML6422 or ML4624 fiber optic quantizer. When this signal exceeds the receive squelch requirements, and the LMONIN input is low, the receive data is buffered and sent to the AUI receive outputs. 27 BIAS BIAS output voltage for the AUI Tx+, Tx– inputs when they are AC coupled. 28 JAB Jabber network status LED. When in the Jabber state, this pin will be low and the transmitter will be disabled. In the Jabber “OK” state this pin will be high. Open collector TTL output. PIN DESCRIPTION PIN NAME FUNCTION 1 CLSN Indicates that a collision is taking place. Active low LED driver, open collector. Event is extended with internal timer for visibility. 2 COL+ Gated 10MHz oscillation used to 3 COL– indicate a collision, SQE test, or jabber. Balanced differential line driver outputs that meet AUI specifications. 4 SQEN/JABD SQE Test Enable, Jabber Disable. When tied low, SQE test is disabled, when tied high SQE test is enabled. When tied to BIAS both SQE test and Jabber are disabled. 5 NC/GND No connection. This pin may be grounded. 6 Rx+ Manchester encoded receive data 7 Rx– output to the local device. Balanced differential line driver outputs that meet AUI specifications. 8VCC +5 volt power input. 9VCC 10 Tx+ Balanced differential line receiver 11 Tx– inputs that meet AUI specifications. These inputs may be transformer, AC or DC coupled. When transformer or AC coupled, the BIAS pin is used to set the common mode voltage 12 RTSET Sets the current driven output of the transmitter. 13 RRSET A 1% 61.9k Ω resistor tied from this pin to VCC sets the biasing currents for internal nodes. 14 NC No Connection 15 XMT Indicates that transmission is taking place. Active low LED driver, open collector. Event is extended with internal timer for visibility. 16 RCV Indicates that the transceiver is receiving a frame from the optical input. Active low LED driver, open collector. Event is extended with internal timer for visibility. 17 VCCTx +5 volt supply for LED driver. 18 TxOUT Fiber optic LED driver output. |
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