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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ML4668 Arkusz danych(PDF) 3 Page - Micro Linear Corporation |
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ML4668 Arkusz danych(HTML) 3 Page - Micro Linear Corporation |
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3 / 14 page  3 ML4668 PIN NAME FUNCTION 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 fiber optic LED driver. 18 TxOUT Fiber optic LED driver output. 19 GND Ground Reference. 20 GND Ground Reference. 21 VDC An external capacitor on this pin integrates an error signal which nulls the offset of the input amplifier. If the DC feedback loop is not being used, this pin should be connected to VREF. 22 VREF A 2.5V reference with respect to GND. 23 VTHADJ This input pin sets the link monitor threshold. 24 AGND Analog Filtered Ground. 25 VIN– This input pin should be capacitively coupled to the input source or to filtered AVCC. (The input resistance is approximately 1.3k Ω.) 26 VIN+ This input pin should be capacitively coupled to the input source or to filtered AVCC. (The input resistance is approximately 1.3k Ω.) 27 AVCC Analog Filtered +5 volts. 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. Active low LED, open collector. 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. 4CTIMER A capacitor from this pin to VCC determines the Link Monitor response time. 5 SQEN/JABD SQE Test Enable, Jabber Disable. When tied low, SQE test is disabled, when tied high SQE test is enabled. When tied to 2.0V both SQE test and Jabber are disabled. 6 Rx+ Manchester encoded receive data 7 Rx– output to the local device. Balanced differential line driver outputs that meet AUI specifications. 8 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) or left floating, the AUI transmit pair data is looped back to the AUI receiver pair, except during collision. 9VCC +5 volt power input. 10 Tx+ Balanced differential line receiver 11 Tx– inputs that meet AUI specifications. These inputs may be transformer or capacitively coupled. The Tx input pins are internally DC biased for AC coupling. 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 LMON Link Monitor “Low Light” LED status output. This pin is pulled low when the voltage on the VIN+, VIN– inputs exceed the minimum threshold set by the VTHADJ pin, and there are transitions on VIN+, VIN– indicating an idle signal or active data. If either the voltage on the VIN+, VIN– inputs fall below the minimum threshold or transitions cease on VIN+, VIN–, LMON will go high. Active low LED driver, open collector. |
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