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ML4667 Dataheets PDF



Part Number ML4667
Manufacturers Micro Linear
Logo Micro Linear
Description Low Power 10BASE-FL Transceiver
Datasheet ML4667 DatasheetML4667 Datasheet (PDF)

March 1997 ML4667 Low Power 10BASE-FL Transceiver GENERAL DESCRIPTION The ML4667 is a low power high output current pin compatible version of the industry standard ML4662. The ML4667 10Base-FL transceiver combined with either the ML4622 or ML4624 fiber optic quantizer provide all functionality required to implement both an internal and external IEEE 802.3 10Base-FL MAU interface that allows it to be directly connected to industry standard manchester encoder/decoder chips or and AUI cable. The M.

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March 1997 ML4667 Low Power 10BASE-FL Transceiver GENERAL DESCRIPTION The ML4667 is a low power high output current pin compatible version of the industry standard ML4662. The ML4667 10Base-FL transceiver combined with either the ML4622 or ML4624 fiber optic quantizer provide all functionality required to implement both an internal and external IEEE 802.3 10Base-FL MAU interface that allows it to be directly connected to industry standard manchester encoder/decoder chips or and AUI cable. The ML4667 provides a highly integrated solution that requires a minimal number of external components. The ML4667 is compliant to the IEEE 802.3 10Base-FL standard. The transmitter offers a 100mA maximum current driven output that directly drives a fiber optic LED transmitter. Jabber, a 1MHz idle signal, and SQE Test are fully integrated onto the chip. The receiver accepts and ECL level input from the ML4622 or ML4624 fiber optic quantizer. The 1MHz idle signal is removed and the AUI output is activated when the receive squelch criteria is exceeded. A Link Monitor function is also provided for low light detection. FEATURES s s s s s s s s Combined with the ML4622 or ML4624, offers a complete implementation of an 10Base-FL Medium Attachment Unit (MAU) Pin compatible with the ML4662 Transceiver Incorporates an AU interface for use in an external MAU or an internal MAU 100mA max LED output current drive Single +5 volt supply ±10% No crystal or clock required On-chip Jabber, 1MHz idle, and SQE Test with enable/ disable option Five network status LED outputs BLOCK DIAGRAM 4 17 12 +5V 19 SQEN/JABD 10 11 Tx+ Tx– AUI RECEIVER VCCTx (+5V) RTSET NC/PEAK TxOUT FIBER OPTIC LED DRIVER 18 Tx SQUELCH 1MHz IDLE SIGNAL JABBER LMONIN SQE COL+ COL– AUI DRIVER 10MHz GATED OSCILLATOR RECEIVE SQUELCH FREQUENCY RxIN+ RxIN– 22 2 3 LINE RECEIVER Tx Rx LED DRIVERS 26 25 6 7 Rx+ Rx– AUI DRIVER LOOPBACK MUX GND 21 VCC (+5V) 8 RRSET 13 LBDIS 23 1 CLSN 28 JAB RCV 16 XMT 15 LMON 24 BIAS 27 +5V 1 ML4667 PIN CONNECTION ML4667 28-Pin PLCC (Q28) SQEN/JABD 4 NC/GND Rx+ Rx– VCC VCC Tx+ Tx– 5 6 7 8 9 10 11 12 RTSET 3 2 1 28 27 26 25 24 23 22 21 20 RxIN+ RxIN– LMON LBDIS LMONIN GND GND NC/PEAK TxOUT COL+ COL– CLSN 13 RRSET 14 15 NC XMT 16 RCV 2 VCCTx BIAS JAB 19 17 18 ML4667 PIN DESCRIPTION PIN NAME FUNCTION 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. Gated 10MHz oscillation used to indicate a collision, SQE test, or jabber. Balanced differential line driver outputs that meet AUI specifications. 19 NC/PEAK 2 3 COL+ COL– 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. Ground reference. Ground reference. Link Monitor Input from the ML4622 or ML4624. This input must be low (active) for the receiver to unsquelch. 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. 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. Fiber optic receive pair. This ECL 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. BIAS output voltage for the AUI Tx+, Tx– inputs when they are AC coupled. 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. 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. NC/GND Rx+ Rx– No connection. This pin may be grounded. Manchester encoded receive data output to the local device. Balanced differential line driver outputs that meet AUI specifications. +5 volt power input. Balanced differential line receiver 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 Sets the current driven output of the transmitter. A 1% 61.9kΩ resistor tied from this pin to VCC sets the biasing currents for internal nodes. No Connection .


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