April 1997 ML4644* 4 Port AUI Multiplexer GENERAL DESCRIPTION FEATURES The ML4644 AUI Multiplexer contains all the necessary drivers/receivers and control logic to implement a 4 port MAU when used in conjuction with a transceiver chip which has a standard 802.3 AUI interface. Several ML4644s can be cascaded together to implement an 8 or 12 port MAU or standalone device. ■ IEEE 802.3 compliant AUI interfaces assure compatibility with any AUI ready devices. ■ On-chip Jabber logic, Collision Detection, and SQE test with enable/disable option. ■ Selectable SQE Test ■ Selectable loopback ■ Ten network status LED outputs. Logic within the ML4644 detects collisions resulting from multiple DTEs transmitting simultaneously. In addition, collision signals received from a transceiver attached at the MAU port are propagated to all of the DTE ports. Jabbering DTEs are prevented from loading down the network by an internal jabber timer which disables babbling ports. * This Part Is End Of Life As Of August 1, 2000 BLOCK DIAGRAM 67 55 56 21 20 54 53 TxIN1P RxOUT1N RxOUT1P CDOUT1N 66 61 X2 X1 TxIN1N 17 OSCILLATOR MAU AUI INTERFACE 25 RRESET X3 VCC 26 VCC BIASING CDOUT1P SQEN1 64 33 5 4 32 46 47 37 36 59 58 44 TxIN3N TxIN3P RxOUT3N RxOUT3P CDOUT3N RxINP RxINN CDINP CDINN MAU AUI INTERFACE 15 14 29 30 63 60 CDOUT3P SQEN3 TxIN4N TxIN4P RxOUT4N RxOUT4P MAU AUI INTERFACE LED DRIVERS CDOUT4N CDOUT4P JAB4 34 DTE AUI INTERFACE JAB3 11 MUX SQEN2 JAB2 12 TxOUTN JAB1 31 TxOUTP CDOUT2P Tx4 1 CDOUT2N MAU AUI INTERFACE Tx3 2 RxOUT2P Tx2 23 RxOUT2N Tx1 24 TxIN2P COLL 7 TxIN2N REC 10 SQEN4 GND 22 3 51 50 49 48 45 19 39 41 52 1 ML4644 CDOUT2N CDOUT2P NC 3 2 1 68 67 66 65 64 63 62 61 X3 COLL 4 NC CDOUT3P 5 CDINP CDOUT3N 6 SQEN1 NC 7 NC TxIN2P 8 X1 NC 9 X2 NC PIN CONNECTIONS TxIN2N 10 60 CDINN TxIN3P 11 59 CDOUT4N TxIN3N 12 58 CDOUT4P NC 13 57 NC TxOUTN 14 56 TxIN1P TxOUTP 15 55 TxIN1N RESERVED 16 54 CDOUT1N RRSET 17 53 CDOUT1P ML4644 NC 18 52 GND JAB2 19 51 Tx1 RxOUT1P 20 50 Tx2 RxOUT1N 21 49 Tx3 REC 22 48 Tx4 RxOUT2P 23 47 TxIN4P RxOUT2N 24 46 TxIN4N VCC 25 45 JAB1 VCC 26 44 SQEN4 NC NC JAB4 NC JAB3 NC RxOUT4N RxOUT4P NC RxOUT3N RxOUT3P SQEN3 SQEN2 RxINN RxINP NC NC 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 PIN DESCRIPTION PIN # NAME FUNC. DESCRIPTION PIN # NAME 1 CDOUT2P Output Collision signal pair for DTE port 2. 13 NC 14 TxOUTN Output 2 CDOUT2N Output Collision signal pair for DTE port 2. Transmit signal pair for MAU port. 15 TxOUTP Output 3 COLL Output Open collector LED driver for collision. Transmit signal pair for MAU port. 16 Reserved 4 CDOUT3P Output Collision signal pair for DTE port 3. 17 RRSET 5 CDOUT3N Output Collision signal pair for DTE port 3. 6 NC No connection. 18 NC 7 TxIN2P Transmit signal pair for DTE port 2. 19 JAB2 Output 8 NC No connection. Open collector jabber LED driver for Jabber of DTE port 2. 9 NC No connection. 20 RxOUT1P Output Receive signal pair for DTE port 1. 10 TxIN2N Input Transmit signal pair for DTE port 2. 21 RxOUT1N Output Receive signal pair for DTE port 1. 11 TxIN3P Input Transmit signal pair for DTE port 3. 22 REC 12 TxIN3N Input Transmit signal pair for DTE port 3. Open collector LED driver for receive. Grounding this pin enables loopback. 2 Input FUNC. DESCRIPTION No connection. This pin should be tied to VCC. Input Bias setting external resistor, 61.9ký, connected to VCC No connection. Output ML4644 PIN DESCRIPTION (Continued) PIN # NAME FUNC. DESCRIPTION PIN # NAME FUNC. DESCRIPTION 23 RxOUT2P Output Receive signal pair for DTE port 2. 48 Tx4 Output 24 RxOUT2N Output Receive signal pair for DTE port 2. Open collector transmit LED driver for Jabber of DTE port 4. 49 Tx3 Output Open collector transmit LED driver for Jabber of DTE port 3. 50 Tx2 Output Open collector transmit LED driver for Jabber of DTE port 2. 51 Tx1 Output Open collector transmit LED driver for Jabber of DTE port 1. 52 GND Ground Ground. 53 CDOUT1P Output Collision signal pair for DTE port 1. 54 CDOUT1N Output Collision signal pair for DTE port 1. 55 TxIN1N Input Transmit signal pair for DTE port 1. Input Transmit signal pair for DTE port 1. 25 VCC Power +5V power supply. 26 VCC Power +5V power supply. 27 NC No connection. 28 NC No connection. 29 RxINP Input Receive signal pair for MAU port. 30 RxINN Input Receive signal pair for MAU port. 31 SQEN2 Input Active low. This pin is used to enable the SQE function of DTE port 2. 32 SQEN3 Input Active low. This pin is used to enable the SQE function of DTE port 3. 33 RxOUT3P Output Receive signal pair for DTE port 3. 56 TxIN1P 34 RxOUT3N Output Receive signal pair for DTE port 3. 57 NC 58 CDOUT4P Output 35 NC No connection. Collision signal pair for DTE port 4. 36 RxOUT4P Output Receive signal pair for DTE port 4. 59 CDOUT4N Output Collision signal pair for DTE port 4. 37 RxOUT4N Output Receive signal pair for DTE port 4. 60 CDINN Input Collision signal pair for MAU port. 38 NC No connection. 61 X3 Output 39 JAB3 ECL output driven by crystal. Can drive X1 inputs on other ML4644S. 40 NC 62 NC 41 JAB4 63 CDINP Input Collision signal pair for MAU port. 64 SQEN1 Input Active low. This pin is used to enable the SQE function of DTE port 1. Output Open collector jabber LED driver for Jabber of DTE port 3. No connection. Output Open collector jabber LED driver for Jabber of DTE port 4. No connection. No connection. 42 NC No connection. 43 NC No connection. 65 NC 44 SQEN4 Input Active low. This pin is used to enable the SQE function of DTE port 4. 66 X1 Input 45 JAB1 Output Open collector jabber LED driver for Jabber of DTE port 1. 46 TxIN4N Input Transmit signal pair for DTE port 4. 10MHz Crystal input pin. This pin can also be used as a 10MHz clock input pin, or can connect to X3 of another that is driven by a crystal or 10MHz clock. 67 X2 Input 10 MHz Crystal input pin. 47 TxIN4P Input Transmit signal pair for DTE port 4. 68 NC No connection. No connection. 3 ML4644 ABSOLUTE MAXIMUM RATINGS OPERATING CONDITIONS Absolute maximum ratings are limits beyond which the life of the integrated circuit may be impaired. All voltages unless otherwise specified are measured with respect to ground. Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . 5V ± 10% RRSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.9ký ± 1% Power Supply Voltage Range VCC . . . GND –0.3 to +6.0V Input Current RRSET, All LED Driver Pins . . . . . . . 60mA Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150°C Storage Temperature . . . . . . . . . . . . . . . . –65°C to 150°C Lead Temperature (Soldering 10 seconds) . . . . . . . 260°C Thermal Resistance (qJA) . . . . . . . . . . . . . . . . . . . 44°C/W ELECTRICAL CHARACTERISTICS Unless otherwise specified TA = 0°C to 70°C, VCC = 5V ± 10%. (Notes 1, 2) PARAMETER CONDITIONS Power Supply Current ICC (Note 3) VCC = 5V LED Drivers: VOL RL=510ý (Note 4) MIN TYP. MAX UNITS 50 150 190 mA 0.8 V –200 mV ±1200 mV Transmit Squelch Voltage Level (Tx+, Tx–) –300 Differential Output Voltage ±550 Common Mode Output Voltage 4.0 Differential Output Voltage Imbalance Loopback Enable Note 1: Note 2: Note 3: 4 –250 2 REC tied low Limits are guaranteed by 100% testing , sampling, or correlation with worst-case test conditions. Low Duty cycle pulse testing is performed at TA. This does not include the current from the AUI pull down resistors or the LED output pins. V ±40 mV 0.3 V ML4644 AC ELECTRICAL CHARACTERISTICS SYMBOLS PARAMETER MIN TYP. MAX UNITS 200 ns TRANSMIT tXODY Transmitter Turn-On Delay 100 tTXSDY Transmit Steady State Prop. Delay 15 ns tTXFPW Transmit Turn-Off Pulse Width 180 ns tTXSOI Transmit Turn-Off Start of Idle 250 ns 200 RECEIVE tRXODY Receive Turn-On Delay 100 tRXSDY Receive Steady State Prop. Delay 15 ns tRXFPW Receive Turn-Off Pulse Width 180 ns tRXSOI Receive Turn-Off Start of Idle 250 ns tAR Differential Output Rise Time 20% to 80% (Rx±, COL±, TxOUT±) 3 ns tAF Differential Output Fall Time 20% to 80% (Rx±, COL±, TxOUT±) 3 ns 200 200 ns COLLISION tCPSQE Collision Present to SQE Assert 0 200 ns tSQEXR Time for SQE to Deactivate After a Collision 0 500 ns FCLF Collision Frequency XTAL Controlled 8.5 10 11.5 MHz Collision Pulse Duty Cycle XTAL Controlled 40 50 60 % FJAM JAM Frequency at TxOUT± XTAL Controlled tSQEDY SQE Test Delay (Tx Inactive to SQE) 0.6 1.1 1.6 µs tSQETD SQE Test Duration 0.5 1.0 1.5 µs 7 13.5 20 ms 5 MHz JABBER, LINK TEST AND LED TIMING tJAD Jabber Activation Delay tJSQE Delay from Outputs Disabled to Collision Oscillator On tLEDT REC, COLL, Tx1, Tx2, Tx3, Tx4 On Time 100 0.3 1.0 ns 3.0 ms 5 ML4644 TIMING DIAGRAMS TxINP VALID DATA TxINN tTxODY tTxFPW tTxSDY tAR TxOUTP VALID tAF tXSOI DATA TxOUTN tTxLP RxOUTP RxOUTN Figure 3. Transmit Timing tRXFPN RxINP VALID RxINN DATA tRXSDY tRXODY tAR RxOUT1, 2, P VALID tAF tRXSOI DATA RxOUT1, 2, N Figure 4. Receive Timing TxIN2P VALID TxIN2N TxIN1P VALID TxIN1N DATA DATA tCPSQE FCLK CDOUT1, 2, P CS0 CDOUT1, 2, N FJAM TxOUTP TxIN2 TxIN2 TxIN2 JAM JAM TxOUTN Figure 5. Collision Timing 6 ML4644 TIMING DIAGRAMS (Continued) TxIN1P TxIN1N TxIN2P VALID DATA TxIN2N tSQEXR CDOUT1, 2, P CS0 CDOUT1, 2, N TxOUTP JAM TxOUTN tXIN2P JAM tXIN2P Figure 6. Collision Timing TxIN1P TxIN1N VALID DATA tSQETD tSQETDY CS0 CDOUT1P CDOUT1N CDOUT2P CDOUT2N Figure 7. SQE Timing TxIN1P TxIN1N VALID DATA tJAD TxOUT1P VALID DATA TxOUT1N tJSQE CDOUT1P CDOUT1N Figure 8. Jabber Timing 7 ML4644 TxOUT1P TxOUT1N tLETD TxLED1 Figure 9. LED Timing 8 ML4644 FUNCTIONAL DESCRIPTION Figure 1 is a block diagram of a Four Port Multiplexer using the ML4644. All AUI interfaces are transformer coupled as required in an AUI connection. RECEPTION The receive function consists of detecting data on receive differential data input pair of the MAU port (RxIN) and transmitting this data out of the RxOUT ports of all the DTE port. This data will only be passed onto the DTE port if it meets the unsquelch criteria of the AUI receiver circuit. This provision prevents any noise on the AUI cable from being misinterpreted as data and transmitted to the RxOUT pins. The receiver squelch circuit rejects signal typically with pulse width less than 20ns or a voltage level more positive than –250mV. Once the receiver is unsquelched, it remains so until reception of the idle signal which is more positive than –170mV for longer than 180ns. TRANSMISSION The transmit function consists of detecting data on any of the four differential data input pairs (TxIN1, TxIN2, TxIN3, and TxIN4) and transmitting this data out of the TxOUT pair of the MAU port. Only data that meets the unsquelch criteria of the AUI receiver circuit will be passed onto the TxOUT port. LOOPBACK If the ML4644 is connected to a MAU, or connected to other 4642/44s that are connected to a MAU, the MAU should be used to provide loopback. The loopback function of the MAU will loop data back to the RxIN port which will pass is to all FxOUTs and the REC pin will go low. In some configurations, there will be no MAU, and a ML4644 will be the last chip in the Tx path. In this case, the RxIN port will never be active, since it is not connected, and the REC pin has no function. The REC pin may be grounded and this will put the ML4644 in loopback mode, and data on the TxIN pair will be looped back to all RxOUT ports. COLLISION There are two possible collision scenarios. 1. Collision from the network connected to the MAU. 2. Collision between two or more DTEs attached to the multiplexer. In the case of a network collision, the MAU will send a collision presence signal to the multiplexer. The ML4644 will propagate this signal to the CDOUT pins of each of the DTE ports. The collision signal is a 10MHz ±0.01% signal. When a collision event occurs between two or more DTE ports, the ML4644 will send the collision presence signal to each of the DTEs via the collision ports. At the same time a 5MHz JAM signal is sent to the network. SQE TEST FUNCTION The Signal Quality Error (SQE) test function allows the DTE to determine whether or not the collision port is functional. After each transmission, during the interpacket gap time, the collision signal will be activated on the CDOUT port of the same DTE port data has been transmitted, for typically 1µs. The SQE function is not activated at the DTE ports that are in jabber state. The SQE function of each port can be disabled by tying the SQEN pin high. JABBER FUNCTION The jabber function prevents a malfunction transmitter from continuous transmission and thus loaded down the network. Within the ML4644, there is a jabber timer. The timer starts at the beginning of a received packet and resets at the end of each packet. If the packet lasts longer than 7 to 20ms the jabber circuit will disable the offending TxIN receiver (the transmission of excessively long packet is thus terminated) and generates a collision signal to the collision port of the offending DTE port. The DTE port will exit the jabber state when the transmission goes idle. LED DRIVERS The ML4644 has ten LED drivers. Each DTE port has a transmit LED and a jabber LED and the MAU port has a receive LED. Additionally there is a collision LED which indicates the presence of a collision condition. All LED drivers are active low open collector driver. All LED drivers except the jabber have pulse 1ms pulse stretchers. The pulse stretchers provide adequate on time for the LED to be visible. CASCADING THE ML4644 FOR EIGHT PORT MULTIPLEXER APPLICATION An 8 port multiplexer can be realized by using two ML4644s and one ML4642. In this configuration (see fig. 2), the SQE function of the ML4642 should be disabled to prevent false collision signalling. The SQE function in this configuration is performed by each DTE port of the ML4644 independently. Only one crystal is required, since X3 of the ML4644 with the crystal can drive X1 of the other chip. ML4644 ML4642 ML4644 Figure 2. Block Diagram of an Eight port Multiplexer. 9 ML4644 39 TxIN1P VCC TxIN1N VCC +5V 39 0.1 .01 0.1µF RxOUT1P +5V RTSET 61.9K RxOUT1N 360Ω 360Ω TxOUTP CDOUT1P TxOUTN CDOUT1N 360Ω 360Ω 360Ω TxIN2P RxINP TxIN2N RxINN RxOUT2P CDINP RxOUT2N CDINN 360Ω 39 39 39 39 CDOUT2P VCC SQEN1 CDOUT2N ML4644 SQEN2 TxIN3P SQEN3 TxIN3N SQEN4 RESERVED X1 10pF RxOUT3P RxOUT3N 10MHz X2 5pF 5pF X3 CDOUT3P CDOUT3N 510 JAB1 JAB2 510 +5V +5V 510 TxIN4P TxIN4N +5V JAB3 510 JAB4 510 Tx1 Tx2 RxOUT4P Tx3 RxOUT4N 510 510 510 Tx4 CDOUT4P CDOUT4N COLL REC Figure 1. Four Port AUI Multiplexer. 10 510 270 +5V +5V +5V +5V +5V +5V +5V ML4644 PHYSICAL DIMENSIONS inches (millimeters) Package: Q68 68-Pin PLCC 0.985 - 0.995 (25.02 - 25.27) 0.042 - 0.056 (1.07 - 1.42) 0.950 - 0.956 (24.13 - 24.28) 0.025 - 0.045 (0.63 - 1.14) (RADIUS) 1 PIN 1 ID 0.042 - 0.048 (1.07 - 1.22) 18 52 0.800 BSC (20.32 BSC) 0.950 - 0.956 0.985 - 0.995 (24.13 - 24.28) (25.02 - 25.27) 0.890 - 0.930 (22.61 - 23.62) 35 0.007 - 0.008 (0.18 - 0.20) 0.050 BSC (1.27 BSC) 0.165 - 0.180 (4.06 - 4.57) 0.026 - 0.032 (0.66 - 0.81) 0.013 - 0.021 (0.33 - 0.53) 0.146 - 0.154 (3.71 - 3.91) 0.095 - 0.118 (2.41 - 3.00) SEATING PLANE ORDERING INFORMATION PART NUMBER TEMPERATURE RANGE PACKAGE ML4644CQ (EOL) 0°C to 70°C 68-Pin PLCC (Q68) © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described in this document may be covered by one or more of the following patents, U.S.: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761; 5,592,128; 5,594,376; Japan: 2598946; 2619299. Other patents are pending. Micro Linear reserves the right to make changes to any product herein to improve reliability, function or design. Micro Linear does not assume any liability arising out of the application or use of any product described herein, neither does it convey any license under its patent right nor the rights of others. The circuits contained in this data sheet are offered as possible applications only. Micro Linear makes no warranties or representations as to whether the illustrated circuits infringe any intellectual property rights of others, and will accept no responsibility or liability for use of any application herein. The customer is urged to consult with appropriate legal counsel before deciding on a particular application. 2092 Concourse Drive San Jose, CA 95131 Tel: 408/433-5200 Fax: 408/432-0295 DS4644-01 11