Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver DESCRIPTION NE83Q93 PIN CONFIGURATION 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 50Ω 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). D, N Packages 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. CD+ 1 24 CDS CD– 2 23 TXO RX+ 3 22 RXI VEE 4 21 VEE VEE 5 20 RR– RX– 6 19 RR+ TX+ 7 18 GND TX– 8 17 HBE TEN 9 16 CRS XLED 10 15 RLED JLED 11 14 LINK LCOM 12 13 CLED SD00311 • Smart squelch on data inputs eliminates false activations • Transmit enable input and carrier sense output for repeater FEATURES • Fully compliant with Ethernet II, IEEE 802.3 10BASE-5 and 10BASE-2, and ISO 8802/3 interface specifications applications • Functionally compatible with industry standard 8392 applications • Optimal implementation can use 1 Watt DC-DC converter and • Five LED status drivers for transmit, receive, collision, jabber and link fail indication reduces external parts count • 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 • 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 ORDERING INFORMATION DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG # 24-Pin Plastic Dual In-Line Package (DIP) 0 to +70°C NE83Q93N 0410D 24-Pin Plastic Small Outline Large (SOL) Package 0 to +70°C NE83Q93D 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 SYMBOL DESCRIPTION 1 2 CD+ CD– 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. 3 6 RX+ RX– Receiver Outputs. Balanced differential line driver outputs which send the received signal to the DTE. External pull-down resistors are optional. 7 8 TX+ TX– 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. 9 TEN 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. 10 XLED Transmit Indicator. Indicates a packet is being transmitted onto the coaxial cable. 11 JLED Jabber Indicator. Indicates that the jabber timer has timed out and the coaxial driver is disabled. 12 LCOM LED Common. The anodes of all status indicator LEDs are connected to this pin. It’s voltage is VEE + 5V. 13 CLED Collision Indicator. Indicates that a collision has been detected. 14 LINK Link Indicator. Indicates that a connection is present to the coaxial cable network. 15 RLED Receive Indicator. Indicates that a packet is being received from the coaxial cable. 16 CRS 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. 17 HBE Heartbeat Enable. The heartbeat function is disabled when this pin is connected to VEE and enabled when connected to GND or left floating. 11 12 RR+ RR– External Resistor. A 1kΩ (1%) resistor connected between these pins establishes the signaling current at TXO. 22 RXI 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. 23 TXO Transmitter Output. This pin is connected directly (Thin Ethernet) or through an external isolating diode (Ethernet) to the coaxial cable. 24 CDS 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. 18 GND Positive Supply Pin. 4 5 21 VEE Negative supply pins. 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 DTE INTERFACE COAX CABLE RXI BUFFER LINE DRIVER RECEIVE PAIR (RX+, RX–) RECEIVER EQUALIZER 4–POLE BESSEL LOW PASS FILTER CARRIER SENSE (CRS) RECEIVER SQUELCH TXO TRANSMIT PAIR (TX+, TX–) TRANSMITTER CDS SENSE BUFFER TEN LINK STATUS CONTROL TRANSMITTER SQUELCH COLLISION (CLED) JABBER (JLED) XLED RLED COLLISION COMPARATOR & HEARTBEAT GENERATOR HBE LCOM COLLISION PAIR (CD+, CD–) 10MHz OSC JABBER TIMER LINE DRIVER SD00312 ABSOLUTE MAXIMUM RATINGS SYMBOL VEE PARAMETER Supply voltage1 input1 VIN Voltage at any TSTG Storage temperature range TSOLD Lead soldering temperature (10sec.) temperature2 TJ Recommended max junction θJA Thermal impedance (N and A packages) NOTE: 1. 100% measured in production. 2. The junction temperature is calculated from the following expression: TJ = TA + θJA [(VEE x 0.015 x nIDL) + (VEE x 0.027 x nRX) + (VEE x 0.075 x nTX)] where TA = Ambient temperature in °C. θJA = 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 RATING UNIT –12 V 0 to –12 V –65 to +150 °C +300 °C +150 °C 60 °C/W Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 ELECTRICAL CHARACTERISTICS VEE = –9V ±6%; TA = 0°C to +70°C unless otherwise specified1,2. No external isolation. LIMITS SYMBOL VUVL PARAMETER TEST CONDITIONS MIN Under voltage lockout. Transceiver disabled for |VEE| < |VUVL| Supply current transmitting (without collision) Without external pull-down resistors and no LED loads IRXI Receive input bias current VRXI = 0V ICDS Cable sense input bias current VCDS = 0V VIH HBE input HIGH voltage VIL HBE input LOW voltage IIH HBE input HIGH current VHBE = 0V IIL HBE input LOW current VHBE = VEE –20 mA –80 –90 mA +25 µA +3 µA –2 +1 V VEE + 2 Input LOW voltage at TEN VEE + 1 ITENL Input LOW current at TEN –50 ITDC Transmit output DC current level3 ITAC Transmit output AC current level3 ITX10 Transmit current VDIS AUI disable voltage at RXI VOD Differential output voltage – non idle at RX+ and CD±6 VOB Differential output voltage imbalance – idle at RX± and CD±7 VOC Output common mode voltage at RX± and CD± VRS Receiver squelch threshold VTS Transmitter squelch threshold RRXI Shunt resistance at RXI non–transmitting CRXI Input capacitance at RXI8 RTXO Shunt resistance at TXO transmitting RAUIZ RTX µA V V –100 µA –37 –45 mA ±28 ±ITDC mA –250 +250 µA –3.7 V –1580 mV Transmitter output voltage compliance4 Collision threshold5 V +10 µA Input HIGH voltage at TEN Measured by applying DC voltage at RXI (CDS = 0V) VEE +1.6 –30 VTENL VCD V VEE +2.4 VTXO = –10V UNIT –15 VTENH VTCOM MAX –7.5 Supply current idle IEE TYP –1450 Measured as DC voltage at RXI –1530 –3.5 ±600 V ±1100 mV ±40 mV RXI = 0V –4.0 –5.5 –7.0 V VRXI average DC (CDS = 0V) –150 –250 –350 mV (VTX+ – VTX–) peak –175 –225 –275 mV 1 2 100 7.5 kΩ pF 10 kΩ Differential impedance at RX± and CD± with no coaxial cable connected 6 kΩ Differential impedance at TX± 20 kΩ LED driver and CRS output VOL Output LOW voltage IOL Output leakage current inactive IOUT = 8mA VEE +1.4 V VEE < VOUT < VEE + 5 10 µA 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 = 27°C. 3. ITDC is measured as (VMAX + VMIN)/(2 x 25) where VMAX and VMIN are the max and min voltages at TXO with a 25Ω 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 100µH 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 70°C, unless otherwise specified1. No external isolation diode on TXO. LIMITS SYMBOL PARAMETER TEST CONDITIONS tRON Receiver start up delay RXI to RX± (Figure 4) First received bit on RX± MIN TYP MAX UNIT VRXI = –2V peak 3 5 bits tRON +2 bits VRXI = –2V peak 20 50 ns First validly timed bit on RX± tRD Receiver prop. delay RXI to RX± tRR Differential output rise time on RX± and CD±2,3 5 7 ns tRF Differential output fall time on RX± and C±2,3 5 7 ns tOS Differential output settling time on RX± and CD± to VOB = 40mV2 (see Figure 5) 1 tRJ Receiver and cable total jitter tRHI Receiver high to idle time tRM Rise and fall time matching on RX+ and CD+ tTST Transmitter start–up delay TX± to TXO (Fig. 6) First transmitted bit on TXO ±2 Measured to +210mV 200 Transmitter prop delay TX± to TXO (see Figure 6) tTR tTF tTM tTS ±6 ns 850 ns tRF – tRR 0.1 ±2 ns VTX+ = –1V peak 1 2 bits tTST + 2 bits First validly timed bit tTD µs VTX+ = 1V peak 5 20 50 ns Transmitter rise time 10% to 90% (see Figure 6) 20 25 30 ns Transmitter fall time 10% to 90% (see Figure 6) 20 25 30 ns tTF – tTR mismatch5 0 ±2 ns Transmitter added skew4,5 0 ±2 ns tTON Transmitter turn on pulse width (see Figure 6) VTX± = 1V peak 10 35 ns tTOFF Transmitter turn off pulse width (see Figure 6) VTX+ = 1V peak 125 200 ns tCON Collision turn on delay (see Figure 7) 0V to –2V step at RXI 13 bits tCOFF Collision turn off delay (see Figure 7) –2V to 0V step at RXI 16 bits tCHI Collision high to idle time (see Figure 7) Measured to +210mV fCD Collision frequency (see Figure 7) tCP 200 8.5 10 850 ns 11.5 MHz Collision signal pulse width (see Figure 7) 35 70 ns tHON Heartbeat turn on delay (see Figure 8) 0.6 1.6 µs tHW Heartbeat test duration (see Figure 8) 0.5 1.5 µs tJA Jabber activation delay measured from TX± to CD± (see Figure 9) 20 60 ms tJR Jabber reset delay measured from TX± to CD± (see Figure 9) 250 650 ms LEDs tLED 10 µs 135 ms 7 10 ms 115 135 ms 10 ms 18 ms Turn-on or turn-off delay of LEDs tXLEDON XLED maximum on time 90 tXLEDOFF XLED minimum off time 5 tRLEDON RLED maximum on time 90 tRLEDOFF RLED minimum off time 5 tCLEDON CLED minimum on time 10 tJLEDON JLED maximum on time tJLEDOFF JLED minimum off time 115 14 NOTES: 1. All typicals are for VEE = –9V and TA = 27°C. 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 100µH 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 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. 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). 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. 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. 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. 4. The NE83Q93 advanced AUI driver (RX± and CD±) design requires no external pull-down resistors (500Ω) to drive a terminated (78Ω) 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 500Ω resistors) would be generated, by these resistors, regardless of whenther the transceiver is idle or responding to traffic. 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. 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 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. 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 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. 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. 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 1µs burst of 10MHz oscillation at the line driver outputs approximately 1µs 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. 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 .5µs. Figures 4 and 5 illustrate receiver timing. 1995 May 1 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. 6 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 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 200kΩ to ground. 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). 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. 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 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. 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. A coaxial cable with only a single 50Ω 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. 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. 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. 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). The LINK signal indicates the status of the coaxial connection. • The LED is ON when the transceiver is connected to a properly terminated coaxial cable. • The LED is OFF when the coaxial cable is disconnected from the 1. CRS is HIGH (no current) when no carrier is present transceiver, or if the coaxial connection is unterminated. The XLED signal indicates the status of the transmitter. 2. CRS is LOW (current sinking) when carrier is present • The LED is OFF when there is no transmission in progress • The LED is turned ON when data is being transmitted and 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. remains ON for typically 115ms. The RLED signal indicates the status of the receiver. • 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. AUI Selection/Under Voltage Lockout The CLED signal indicates the status of the collision detection circuit. 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. • 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. There is no collision announcement during power up and the transceiver waits for 400ms before becoming enabled. • 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. 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. 1995 May 1 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 Philips Semiconductors Product specification Enhanced coaxial Ethernet transceiver NE83Q93 AUI CABLE 12 TO 15V DC + DC TO DC CONVERTER <200mA 9V (ISOLATED) – 500Ω 1 COLLISION PAIR 500Ω 500Ω 78Ω 2 DTE 16 (NOTE 4) 500Ω 15 T1 (NOTE 1) (NOTE 3) COAX 4 13 CD+ RECEIVE PAIR 78Ω 1 16 2 15 CD– 5 12 RX+ 3 VEE VEE 7 10 NE83C92 14 4 13 5 12 CTI 6 11 7 10 8 9 TX+ 8 9 78Ω TXO (NOTE 2) RXI VEE RR– RX– TRANSMIT PAIR CDS 200kΩ RR+ 1kΩ 1% GND TX– HBE (NOTE 5) NOTES: 1. T1 is a 1:1 pulse transformer, with an inductance of 30 to 100µH. 2. IN916 or equivalent for Ethernet, not required for Thin Ethernet. 3. 78Ω 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 200kΩ 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 OPTO-ISOLATOR CTI +5V 16 LCOM 15 OPTO-ISOLATOR 14 TEN 9 13 TRANSMIT ENABLE (TTL/CMOS) 12 CRS CARRIER DETECT (TTL/CMOS) RLED LINK CLED LCOM JLED 11 VEE VEE 10 XLED SD00314 Figure 2. Control Interface Connections MAU COAX I S O L A T I O N NE83Q93 COAX TRANSCEIVER INTERFACE SERIAL NETWORK INTERFACE (OPTIONAL) (AUI CABLE) 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 10 11 tRD 90% RX+ 10% 5 6 7 8 9 tRON+2 tTR tRON 10 tTF tRR 11 tRF 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 100ns tTST tTOFF TX+ 1 2 3 4 5 6 7 tTON tTD 8 9 10 TXO 11 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) (LCOM) CLED TCLEDON TCLEDON TCLEDON (VEE) CD (JABBER ON) (LCOM) JLED JABBER LED ON (VEE) LINE DISCONNECTED COAX (LCOM) LINK (LED) (VEE) LINK LED OFF RX (LCOM) CRS (VEE) SD00510 Figure 10. LED Timing 1995 May 1 11