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| Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 DESCRIPTION The NE83Q93 is a low power coaxial transceiver interface (CTI) for Ethernet (10base5) and Thin Ethernet (10base2) local area networks. The CTI is connected between the coaxial cable and the Data Terminal Equipment (DTE) and consists of a receiver, transmitter, receive-mode collision detector, heartbeat generator and jabber timer (see Block Diagram). The transmitter output connects directly to a doubly terminated 50 cable, while the receiver output, collision detector output and transmitter input are connected to the DTE through isolation transformers. Isolation between the CTI and the DTE is an IEEE 802.3 requirement that can be met on signal lines by using a set of pulse transformers. Power isolation for the CTI is achieved using DC-to-DC conversion through a power transformer (see Figure 1, Connection Diagram). The part is functionally the same as the NE83Q92, but with additional features such as a transmit enable input, a carrier detect output and five status LED driver outputs. The NE83Q93 is manufactured on an advanced BiCMOS process and is available in an SOL package making it ideally suited to lap-top personal computers or systems where low power consumption, limited board space and jumperless design is required. Refer to selection flow chart for optimal application. PIN CONFIGURATION D, N Packages CD+ CD- RX+ VEE VEE RX- TX+ TX- TEN XLED JLED LCOM 1 2 3 4 5 6 7 8 9 10 11 12 24 CDS 23 TXO 22 RXI 21 VEE 20 RR- 19 RR+ 18 GND 17 HBE 16 CRS 15 RLED 14 LINK 13 CLED SD00311 FEATURES * Fully compliant with Ethernet II, IEEE 802.3 10BASE-5 and 10BASE-2, and ISO 8802/3 interface specifications * Smart squelch on data inputs eliminates false activations * Transmit enable input and carrier sense output for repeater applications * Functionally compatible with industry standard 8392 applications * Optimal implementation can use 1 Watt DC-DC converter and reduces external parts count * Five LED status drivers for transmit, receive, collision, jabber and link fail indication * High efficiency AUI drivers minimize current consumption under idle conditions by automatically powering-down * Automatically disables AUI drivers when disconnecting coax cable, allowing hard-wiring of AUI connector and local/integrated CTI connection * Advanced BiCMOS process for extremely low power operation * Available in 24-pin DIP and 24-pin SOL packages * Full ESD protection * Power-on reset prevents glitches on coaxial cable ORDERING INFORMATION DESCRIPTION 24-Pin Plastic Dual In-Line Package (DIP) 24-Pin Plastic Small Outline Large (SOL) Package TEMPERATURE RANGE 0 to +70C 0 to +70C ORDER CODE NE83Q93N NE83Q93D DWG # 0410D SOT137-1 1995 May 1 1 853-1738 15180 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 PIN DESCRIPTIONS PIN NO. D, N PKG 1 2 3 6 7 8 9 10 11 12 13 14 15 16 17 11 12 22 23 24 18 4 5 21 SYMBOL CD+ CD- RX+ RX- TX+ TX- TEN XLED JLED LCOM CLED LINK RLED CRS HBE RR+ RR- RXI TXO CDS GND DESCRIPTION Collision Outputs. Balanced differential line driver outputs which send a 10MHz signal to the DTE in the event of a collision, jabber interrupt or heartbeat test. External pull-down resistors are optional. Receiver Outputs. Balanced differential line driver outputs which send the received signal to the DTE. External pull-down resistors are optional. Transmitter Inputs. Balanced differential line receiver inputs which accept the transmission signal from the DTE and apply it to the coaxial cable at TXO, if it meets Tx squelch threshold. Transmit Enable. A CMOS compatible input requiring an input voltage range of VEE to VEE + 5V. The transmitter and loopback functions are disabled when TEN is LOW and enabled when TEN is HIGH or left floating. TEN is normally driven through an opto-coupler. Transmit Indicator. Indicates a packet is being transmitted onto the coaxial cable. Jabber Indicator. Indicates that the jabber timer has timed out and the coaxial driver is disabled. LED Common. The anodes of all status indicator LEDs are connected to this pin. It's voltage is VEE + 5V. Collision Indicator. Indicates that a collision has been detected. Link Indicator. Indicates that a connection is present to the coaxial cable network. Receive Indicator. Indicates that a packet is being received from the coaxial cable. Carrier Sense. A real time output that indicates the presence of a carrier on the coaxial cable. CRS is normally used to drive an opto-coupler. Heartbeat Enable. The heartbeat function is disabled when this pin is connected to VEE and enabled when connected to GND or left floating. External Resistor. A 1k (1%) resistor connected between these pins establishes the signaling current at TXO. Receiver Input. This pin is connected directly to the coaxial cable. Received signals are equalized, amplified, and sent to the DTE through the RX+ pins, if it meets Rx squelch threshold. Transmitter Output. This pin is connected directly (Thin Ethernet) or through an external isolating diode (Ethernet) to the coaxial cable. Collision Detect Sense. Ground sense connection for the collision detection circuitry. This pin should be connected directly to the coaxial cable shield for standard Ethernet operation. Positive Supply Pin. Negative supply pins. VEE NOTE: 1. The IEEE 802.3 name for CD is CI; for RX is DI; for TX is DO. 1995 May 1 2 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 BLOCK DIAGRAM COAX CABLE DTE INTERFACE RXI BUFFER RECEIVER EQUALIZER LINE DRIVER RECEIVE PAIR (RX+, RX-) 4-POLE BESSEL LOW PASS FILTER RECEIVER SQUELCH CARRIER SENSE (CRS) TRANSMIT PAIR (TX+, TX-) TXO CDS SENSE BUFFER TRANSMITTER TEN TRANSMITTER SQUELCH STATUS CONTROL LINK COLLISION (CLED) JABBER (JLED) XLED RLED LCOM HBE COLLISION COMPARATOR & HEARTBEAT GENERATOR 10MHz OSC JABBER TIMER LINE DRIVER COLLISION PAIR (CD+, CD-) SD00312 ABSOLUTE MAXIMUM RATINGS SYMBOL VEE VIN TSTG TSOLD TJ JA Supply voltage1 Voltage at any input1 PARAMETER RATING -12 0 to -12 -65 to +150 +300 +150 60 UNIT V V Storage temperature range Lead soldering temperature (10sec.) Recommended max junction temperature2 C C C C/W Thermal impedance (N and A packages) NOTE: 1. 100% measured in production. 2. The junction temperature is calculated from the following expression: TJ = TA + JA [(VEE x 0.015 x nIDL) + (VEE x 0.027 x nRX) + (VEE x 0.075 x nTX)] where TA = Ambient temperature in C. JA = Thermal resistance of package. VEE = Normal operating supply voltage in volts. nIDL = Percentage of duty cycle idle nRX = Percentage of duty cycle receiving nTX = Percentage of duty cycle transmitting 1995 May 1 3 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 ELECTRICAL CHARACTERISTICS VEE = -9V 6%; TA = 0C to +70C unless otherwise specified1,2. No external isolation. LIMITS SYMBOL VUVL PARAMETER Under voltage lockout. Transceiver disabled for |VEE| < |VUVL| Supply current idle IEE IRXI ICDS VIH VIL IIH IIL VTENH VTENL ITENL ITDC ITAC ITX10 VTCOM VCD VDIS VOD VOB VOC VRS VTS RRXI CRXI RTXO RAUIZ RTX VOL IOL Supply current transmitting (without collision) Receive input bias current Cable sense input bias current HBE input HIGH voltage HBE input LOW voltage HBE input HIGH current HBE input LOW current Input HIGH voltage at TEN Input LOW voltage at TEN Input LOW current at TEN Transmit output DC current level3 Transmit output AC current level3 Transmit current Transmitter output voltage compliance4 Collision threshold5 AUI disable voltage at RXI Differential output voltage - non idle at RX+ and CD6 Differential output voltage imbalance - idle at RX and CD7 Output common mode voltage at RX and CD Receiver squelch threshold Transmitter squelch threshold Shunt resistance at RXI non-transmitting Input capacitance at RXI8 Shunt resistance at TXO transmitting Differential impedance at RX and CD with no coaxial cable connected Differential impedance at TX Output LOW voltage Output leakage current inactive IOUT = 8mA VEE < VOUT < VEE + 5 7.5 RXI = 0V VRXI average DC (CDS = 0V) (VTX+ - VTX-) peak -4.0 -150 -175 100 1 10 6 20 VEE +1.4 10 2 -5.5 -250 -225 Measured by applying DC voltage at RXI (CDS = 0V) Measured as DC voltage at RXI 600 -1450 -1530 -3.5 1100 40 -7.0 -350 -275 VTXO = -10V -37 28 -250 VHBE = 0V VHBE = VEE -30 VEE + 2 VEE + 1 -50 -100 -45 ITDC +250 -3.7 -1580 Without external pull-down resistors and no LED loads VRXI = 0V VCDS = 0V VEE +2.4 VEE +1.6 +10 -2 +1 TEST CONDITIONS MIN TYP -7.5 -15 -80 -20 -90 +25 +3 MAX UNIT V mA mA A A V V A A V V A mA mA A V mV V mV mV V mV mV k pF k k k V A LED driver and CRS output NOTES: 1. Currents flowing into device pins are positive. All voltages are referenced to ground unless otherwise specified. For ease of interpretation, the parameter limit that appears in the MAX column is the largest value of the parameter, irrespective of sign. Similarly, the value in the MIN column is the smallest value of the parameter, irrespective of sign. 2. All typicals are for VEE = -9V and TA = 27C. 3. ITDC is measured as (VMAX + VMIN)/(2 x 25) where VMAX and VMIN are the max and min voltages at TXO with a 25 load between TXO and GND. ITAC is measured as (VMAX - VMIN)/(2 x 25). 4. The TXO pin shall continue to sink at least ITDC min when the idle (no signal) voltage on this pin is -3.7V. 5. Collision threshold for an AC signal is within 5% of VCD. 6. Measured on secondary side of isolation transformer (see Connection Diagram, Figure 1). The transformer has a 1:1 turns ratio with an inductance between 30 and 100H at 5MHz. 7. Measured as the voltage difference between the RX pins or the CD pins with the transformer removed. 8. Not 100% tested in production. 1995 May 1 4 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 TIMING CHARACTERISTICS VEE = -9V +6%; TA = 0 to 70C, unless otherwise specified1. No external isolation diode on TXO. LIMITS SYMBOL tRON tRD tRR tRF tOS tRJ tRHI tRM tTST tTD tTR tTF tTM tTS tTON tTOFF tCON tCOFF tCHI fCD tCP tHON tHW tJA tJR LEDs tLED tXLEDON tXLEDOFF tRLEDON tRLEDOFF tCLEDON tJLEDON tJLEDOFF Turn-on or turn-off delay of LEDs XLED maximum on time XLED minimum off time RLED maximum on time RLED minimum off time CLED minimum on time JLED maximum on time JLED minimum off time 90 5 90 5 10 14 115 7 115 10 135 10 135 10 18 s ms ms ms ms ms PARAMETER Receiver start up delay RXI to RX (Figure 4) First received bit on RX First validly timed bit on RX Receiver prop. delay RXI to RX Differential output rise time on RX and CD2,3 Differential output fall time on RX and C2,3 Differential output settling time on RX and CD to VOB = 40mV2 (see Figure 5) Receiver and cable total jitter Receiver high to idle time Rise and fall time matching on RX+ and CD+ Transmitter start-up delay TX to TXO (Fig. 6) First transmitted bit on TXO First validly timed bit Transmitter prop delay TX to TXO (see Figure 6) Transmitter rise time 10% to 90% (see Figure 6) Transmitter fall time 10% to 90% (see Figure 6) tTF - tTR mismatch5 Transmitter added skew4,5 Transmitter turn on pulse width (see Figure 6) Transmitter turn off pulse width (see Figure 6) Collision turn on delay (see Figure 7) Collision turn off delay (see Figure 7) Collision high to idle time (see Figure 7) Collision frequency (see Figure 7) Collision signal pulse width (see Figure 7) Heartbeat turn on delay (see Figure 8) Heartbeat test duration (see Figure 8) Jabber activation delay measured from TX to CD (see Figure 9) Jabber reset delay measured from TX to CD (see Figure 9) VTX = 1V peak VTX+ = 1V peak 0V to -2V step at RXI -2V to 0V step at RXI Measured to +210mV 200 8.5 35 0.6 0.5 20 250 10 10 125 VTX+ = 1V peak 5 20 20 20 25 25 0 0 Measured to +210mV tRF - tRR VTX+ = -1V peak 200 0.1 1 VRXI = -2V peak 20 5 5 1 2 6 850 2 2 tTST + 2 50 30 30 2 2 35 200 13 16 850 11.5 70 1.6 1.5 60 650 TEST CONDITIONS VRXI = -2V peak MIN TYP 3 MAX 5 tRON +2 50 7 7 UNIT bits bits ns ns ns s ns ns ns bits bits ns ns ns ns ns ns ns bits bits ns MHz ns s s ms ms NOTES: 1. All typicals are for VEE = -9V and TA = 27C. 2. Measured on secondary side of isolation transformer (see Figures 1 and 2, Connection Diagram). The transformer has a 1:1 turn ratio with an inductance between 30 and 100H at 5MHz. 3. The rise and fall times are measured as the time required for the differential voltage to change from -225mV to +225mV, or +225mV to -225mV, respectively. 4. Difference in propagation delay between rising and falling edges at TXO. 5. Not 100% tested in production. 1995 May 1 5 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 FUNCTIONAL DESCRIPTION The NE83Q93 is a low power BiCMOS coaxial Ethernet transceiver which complies with the IEEE 802.3 specification and offers a number of additional features. These features are: 1. Low current consumption of typically 15mA when idle and 80mA while transmitting without collision allows smaller DC-DC converter to be used for the isolated power supply (no external pull-down resistors). 2. Automatic selection between AUI cable and coaxial connections by placing the AUI outputs in a high impedance state when the coaxial cable is disconnected. This eliminates the need for changing a jumper position on the Ethernet board when selecting either Thin Ethernet or remote transceiver connections. 3. High efficiency AUI drivers for the RX and CD ports automatically power down when idling and are powered-up when a receive signal is detected. This is very important/useful for power sensitive applications such as lap-top computers or PCMCIA cards. 4. The NE83Q93 advanced AUI driver (RX and CD) design requires no external pull-down resistors (500) to drive a terminated (78) AUI cable and still meets the IEEE 802.3 specification. The drivers will also operate correctly if external resistors are present, so that they can be retro-fitted into existing 8392 designs. However, an extra current of 7mA/output (for 500 resistors) would be generated, by these resistors, regardless of whenther the transceiver is idle or responding to traffic. 5. Transmit enable input and carrier sense output for direct use in repeater applications. 6. LED control circuitry and drivers for indicating the transmit, receive, collision, jabber and link status of the transceiver unit. The differential line driver provides typically +900mV signals to the DTE with less than 7ns rise and fall times. When in idle state (no received signal) its outputs provide <20mV differential voltage offset to minimize DC standing current in the isolation transformer. Transmitter Functions The transmitter has differential inputs and an open collector current driver output. The differential input common mode voltage is established by the CTI and should not be altered by external circuitry. Controlled rise and fall times of 25ns (+5ns) minimize higher harmonic components in the transmitted spectrum, while matching of these rise and fall times to typically 2ns minimizes signal jitter. The drive current levels of the CTI are set by an on-chip bandgap voltage reference and an external 1% resistor. An on-chip isolation diode is provided to reduce the transmitter's coaxial cable load capacitance. For Thin Ethernet applications, no further external isolation diode is required, since the NE83Q93 meets the capacitive loading specifications. For Ethernet applications a further external diode should be added to reduce loading capacitance. The transmitter squelch circuit ensures that the transmitter can only be enabled if the transmitted packet begins with a 01 bit sequence where the negative-going differential signals are typically greater than 225mV in magnitude and 25ns in duration. The transmitter will be disabled at the end of a packet if there are no negative going signals of greater than 225mV for more than typically 150ns. Figure 6 illustrates transmitter timing. Collision Functions The collision detection scheme implemented in the NE83Q93 is receive mode detection, which detects a collision between any two stations on the network with certainty at all times, irrespective of whether or not the local DTE is producing one of the colliding signals. This is the only detection scheme allowed by the IEEE 802.3 standard for both repeater and non-repeater nodes. The collision circuitry consists of the 4-pole Bessel low pass filter, a comparator, a precision voltage reference that sets up the collision threshold, a heartbeat generator, a 10MHz oscillator, and a differential line driver. The collision comparator monitors the DC level at the output of the low pass filter and enables the line driver if it is more negative than the collision threshold. A collision condition is indicated to the DTE by a 10MHz oscillation signal at the CD outputs and typically occurs within 700ns of the onset of the collision. The collision signal begins with a negative-going pulse and ends with a continuous high-to-idle state longer than 170ns. Figure 7 illustrates collision timing. At the end of every transmission, the heartbeat generator creates a pseudo collision to ensure that the collision circuitry is properly functioning. This pseudo collision consists of a 1s burst of 10MHz oscillation at the line driver outputs approximately 1s after the end of the transmission. The heartbeat function can be disabled externally by connecting the HBE (heartbeat enable) to VEE. This allows the CTI to be used in repeater applications. Figure 8 illustrates heartbeat timing. Receiver Functions The receiver consists of an input buffer, a cable equalizer, a 4-pole Bessel low pass filter, a squelch circuit and a differential line driver. The buffer provides high input resistance and low input capacitance to minimize loading and reflections on the coaxial cable. The equalizer is a high pass filter that compensates for the low pass effect of the coaxial cable and results in a flatband response over all signal frequencies to minimize signal distortion. The 4-pole Bessel low pass filter extracts the average DC voltage level on the coaxial cable for use by the receiver squelch and collision detection circuits. The receiver squelch circuit prevents noise on the coaxial cable from falsely triggering the receiver in the absence of a true signal. At the beginning of a packet, the receiver turns on when the DC level from the low pass filter exceeds the DC squelch threshold and the received packet has started with a 01 bit sequence with acceptable timing parameters. For normal signal levels this will take less than 500ns, or 5 bits. However, at the end of a packet, a fast receiver turn off is needed to reject both dribble bits on the coaxial cable and spurious responses due to settling of the on-chip bandpass filter. This is accomplished by an AC timing circuit that disables the receiver if the signal level on the coaxial cable remains high for typically 250ns and only enables the receiver again after approximately .5s. Figures 4 and 5 illustrate receiver timing. Jabber Functions The jabber timer monitors the transmitter and inhibits transmission if it is active for longer than typically 30ms. The jabber circuit then enables the collision outputs for the remainder of the data packet and for typically 450ns (unjab time) after it has ended. At this point the transmitter becomes uninhibited. Figure 9 illustrates jabber timing. 1995 May 1 6 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 Control Interface Signals The NE83Q93 provides two input and one output signal for mode control and interfacing within repeaters. The output signal is Carrier Sense (CRS) and the input signals are Heartbeat Enable (HBE) and Transmit Enable (TEN). The HBE input controls the transmission of the heartbeat (or SQE) signal to the DTE for testing the collision detection function. It is normally hardwired to VEE or GND. 1. The heartbeat (SQE) function is DISABLED when HBE is connected to VEE 2. The heartbeat (SQE) function is ENABLED when HBE is connected to GND or left floating The TEN input controls the coaxial transmitter. It is a CMOS compatible input requiring a driving signal with a voltage range of VEE to VEE + 5V. It is normally driven through an opto-coupler to provide electrical isolation. A typical application circuit is shown in Figure 2. 1. The coaxial transmitter is DISABLED when a LOW is applied to TEN or it is directly connected to VEE. Since the loopback function of the NE83Q93 occurs through the coaxial connection the loopback function is also disabled. 2. The coaxial transmitter is ENABLED when a HIGH is applied to TEN or it is directly connected to GND or left floating. The CRS output indicates the presence of a carrier signal on the coaxial cable. It is open drain output designed to drive the LED of an opto-coupler connected between CRS and LCOM through a current limiting series resistor. A LOW at CRS is VEE and a HIGH is the voltage at LCOM (VEE + 5V). 1. CRS is HIGH (no current) when no carrier is present 2. CRS is LOW (current sinking) when carrier is present On applying a HIGH to TEN through an opto-coupler the transmitter is enabled but it still has to recognize the normal squelch-qualified 01 bit sequence with the negative-going differential signals meeting the necessary magnitude and duration requirements. The set-up time needed from application of a HIGH at TEN to recognizing the first 01 bit sequence is typically 25ns. The propagation delay through an opto-coupler is of the order of 200ns. There is a 400ms collision announcement on disconnecting RXI, but there is no announcement on re-connection. This feature can be disabled by pulling RXI up with a 200k to ground. Detection of Coaxial Cable Faults In the NE83Q93 there is no internal loopback path from the TX inputs to the RX outputs. This means that, when the local DTE is transmitting, the signal will only be present at the receiver outputs RX+ and RX- if it appears on the coaxial cable and is larger than the receiver squelch threshold VRS. If a short circuit fault condition occurs at the cable connector to the CTI, then no signal will appear at the receiver outputs. In the case of an open circuit at the coaxial cable connector there will also be no signal at the receiver outputs due to the AUI disabling mode of the NE83Q93. However, a heartbeat signal will be present following a transmission attempt for the short circuit condition, but not for the open circuit. A coaxial cable with only a single 50 termination will generate a collision not only at every transmission attempt, but also for every reception attempt due to the receive mode collision detection of the NE83Q93. Status Indicator Functions The NE83Q93 provides five status outputs, the open drain device connected to each is capable of directly driving an LED or opto-coupler, or other logic circuits if an external pull-up resistor is used. The functional descriptions below are for an LED connected between the output and LCOM (VEE + 5V) through a current limiting series resistor. * The LED is ON when the transceiver is connected to a properly terminated coaxial cable. The LINK signal indicates the status of the coaxial connection. * The LED is OFF when the coaxial cable is disconnected from the transceiver, or if the coaxial connection is unterminated. * The LED is OFF when there is no transmission in progress * The LED is turned ON when data is being transmitted and remains ON for typically 115ms. The XLED signal indicates the status of the transmitter. * The LED is OFF when no signal is being received. * The LED is turned ON when data is received and remains ON for typically 115ms. The CLED signal indicates the status of the collision detection circuit. The RLED signal indicates the status of the receiver. AUI Selection/Under Voltage Lockout The transmit and receive squelch circuits of the NE83Q93 remain active if the absolute value of VEE is less than the threshold for under voltage lockout, VUVL. This prevents glitches from appearing on either the AUI or coaxial cable during power up and power down. There is no collision announcement during power up and the transceiver waits for 400ms before becoming enabled. If RXI is disconnected from the coaxial cable after power up, its voltage will fall towards VEE. If the absolute value of this voltage exceeds the AUI disable voltage, VDIS, for longer than 800ms, the transmit and receive squelch circuits remain active and, in addition, the AUI drivers become high impedance. This permits AUI connections to be hard wired together, e.g., the coaxial transceiver and a 10BASE-T transceiver, with the signal path determined by which transceiver is connected to its external cable. * The LED is OFF for no collision. * The LED turns ON when a collision is detected and remains ON for typically 12ms after the end of the collision. * In the event of another collision during the latter 6ms of the 12 ms delay period after the end of the last collision, the LED will turn off for typically 6ms then back ON to indicate the new collision. The JLED signal indicates the status of the jabber control circuit. * The LED is OFF for a no-jab condition. * The LED turns ON when the coaxial transmitter output is jabbed. * The LED turns back off when the transmitter is unjabbed. 7 1995 May 1 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 AUI CABLE 12 TO 15V DC DC TO DC CONVERTER <200mA + 9V (ISOLATED) - 500 (NOTE 4) 1 COLLISION PAIR 16 500 500 500 78 2 15 DTE T1 (NOTE 1) (NOTE 3) 4 RECEIVE PAIR 13 CD+ 1 78 5 12 CD- 2 RX+ 3 VEE VEE 7 TRANSMIT PAIR 8 9 78 10 RX- 6 TX+ 7 TX- 8 9 10 HBE (NOTE 5) 11 4 5 15 14 13 12 RR+ 1k 1% GND 16 CDS TXO RXI VEE RR- 200k (NOTE 2) COAX NE83C92 CTI NOTES: 1. T1 is a 1:1 pulse transformer, with an inductance of 30 to 100H. 2. IN916 or equivalent for Ethernet, not required for Thin Ethernet. 3. 78 resistors not required if AUI cable is not used, i.e., local transceiver. 4. Typical pull-down resistors are not required for either 10BASE2 or 10BASE5 application. Remove them for minimum current consumption. 5. Install 200k to disable the 400ms collision announcement when disconnecting cable. SD00313 Figure 1. Connection Diagram for Standard 8392 Applications 1995 May 1 8 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 NE83Q93 +5V CTI +5V 16 LCOM OPTO-ISOLATOR TEN TRANSMIT ENABLE (TTL/CMOS) VEE VEE 10 15 14 9 13 12 11 XLED CRS RLED LINK CLED LCOM JLED OPTO-ISOLATOR CARRIER DETECT (TTL/CMOS) SD00314 Figure 2. Control Interface Connections COAX MAU NE83Q93 COAX TRANSCEIVER INTERFACE I S O L A T I O N (OPTIONAL) (AUI CABLE) SERIAL NETWORK INTERFACE NETWORK INTERFACE CONTROLLER B U S DTE MAU = Medium Attachment Unit AUI Cable = Attachment Unit Interface Cable (not used in Thin Ethernet applications) SD00315 Figure 3. Interface Diagram for Ethernet/Thin Ethernet Local Area Network RXI 1 2 3 4 PHASE VIOLATION ALLOWED 5 6 VALID TIMING 7 8 9 tRD 10 11 90% RX+ 10% 5 tRON+2 tRON tTR 6 7 8 9 tTF tRR 10 tRF 11 SD00306 Figure 4. Receiver Timing 1995 May 1 9 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 RXI tOS tRHI RX+ SD00279 Figure 5. Receiver End-of-Packet Timing tTST+2 tTST TX+ 1 tTON TXO 2 3 4 5 6 7 8 9 10 11 100ns tTOFF tTD 90% 10% 1 2 3 4 5 6 7 8 9 tTR 10 11 tTF tRF tRR SD00305 Figure 6. Transmitter Timing RXI 0V -2V tCON tCOFF tCHI CD+ 1/FCD tCP SD00280 Figure 7. Collision Timing TX+ tHON tHW CD+ SD00281 Figure 8. Heartbeat Timing 1995 May 1 10 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 TX+ tJA tJR TXO CD+ SD00282 Figure 9. Jabber Timing TX, RX (LCOM) XLED, RLED (V ) EE TXLEDON TRLEDON TXLEDOFF TRLEDOFF CD (COLLISION) CLED (LCOM) (VEE) TCLEDON TCLEDON TCLEDON CD (JABBER ON) JLED (LCOM) (VEE) JABBER LED ON COAX (LCOM) LINK (LED) (VEE) LINE DISCONNECTED LINK LED OFF RX (LCOM) CRS (VEE) SD00510 Figure 10. LED Timing 1995 May 1 11 |
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