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| HYC9088A Half Height ARCNET Twisted Pair and Coaxial Compatible High Impedance Transceiver HIT FEATURES * * * * * ARCNET on Twisted Pair or Coaxial Cable Drives Shielded and Unshielded Twisted Pair Cable or Coaxial Cable Compatible with Existing ARCNET Installations 2.5 Mbps operation Pin Compatible with the ARCNET HYC9068 LAN Driver with the Addition of a Single Terminating Resistor * * * * * Supports Star, Bus, and Daisy Chained Configurations Enhanced Built-in Filters for Reduced EMI Twenty Pin Single In-Line Package Straight or Right Angle Lead Frame New Reduced Size GENERAL DESCRIPTION The HYC9088 Twisted Pair and Coaxial Compatible High Impedance Transceiver (HIT) is a hybrid module that interfaces an ARCNET Local Area Network controller to one twisted pair or coaxial cable. The HIT interfaces directly with Standard Microsystems Corporation's ARCNET LAN controllers operating at 2.5 Mbps and connects to a variety of shielded and unshielded twisted pair or coaxial cables via an on-board transformer. The network topologies supported by the HIT are daisy chain, star, and bus configurations. During data transmission, the HIT converts the digital pulse information provided by the LAN controller into analog signals and drives them onto the cable. The transmitted signals are filtered to eliminate undesirable frequencies. The receiver section of the HYC9088 identifies dipulse signals on the cable and converts them into TTL signals to be supplied to the LAN controller. The HIT supports ARCNET's Dipulse Encoding Scheme and, is 100% compatible with all existing coax-based ARCNET networks. This provides an ARCNET network designer with flexibility to easily combine coax and twisted pair cabling. The HYC9088 is pin compatible with the HYC9058 High Impedance Transceiver and is pin compatible with the HYC9068 LAN Driver with the addition of a single terminating resistor. TABLE OF CONTENTS FEATURES...................................................................................................................................................... 1 GENERAL DESCRIPTION.............................................................................................................................. 1 PIN CONFIGURATION.................................................................................................................................... 3 DESCRIPTION OF PIN FUNCTIONS............................................................................................................ 4 FUNCTIONAL DESCRIPTION........................................................................................................................ 5 APPLICATION INFORMATION ..................................................................................................................... 5 OPERATIONAL DESCRIPTION .................................................................................................................. 11 MAXIMUM GUARANTEED RATINGS.......................................................................................... 11 DC ELECTRICAL CHARACTERISTICS...................................................................................... 11 2 PIN CONFIGURATION Pin 1 Designator 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 NC NC VDD GND NC VCC RX TPA NC TPD PH-B/SHIELD PH-A/CENTER GND GND TPC TPB GND nPULSE2 DISABLE nPULSE1 T O P V I E W PACKAGE: 20-Pin SIP Ordering Information: HYC9088AR for right angle lead frame HYC9088AS for straight lead frame 3 DESCRIPTION OF PIN FUNCTIONS PIN NO. 1, 2, 5, 9 3 4, 13, 14, 17 6 7 8, 16, 15, 10 11 12 18 19 20 NAME No Connect Power Supply Ground Power Supply Receive Data Test Points Phase-B/ Shield Phase-A/ Center nPulse 2 Disable TX nPulse 1 SYMBOL NC VDD GND VCC RX TPA, TPB, TPC, TPD PH-B/ SHIELD PH-A/ CENTER nPULSE2 DISABLE TRANSMIT nPULSE1 -5 Volts power supply. Ground. +5 Volts power supply. Output. This signal carries the TTL receive pulse information to the ARCNET LAN Controller Device. Test points. Make no connection to these pins. Output. Connect this signal to Twisted Pair Connector pin 3 or the shield of the coaxial cable. Output. Connect this signal to Twisted Pair Connector pin 2 or the center of the coaxial cable. Input. This signal is supplied by the ARCNET LAN Controller Device. Input. A high level on this signal disables the transmit section of the HYC9088. It is normally connected to ground. Input. This signal is supplied by the ARCNET LAN Controller Device. DESCRIPTION Not used. Make no connection to these pins. 4 FUNCTIONAL DESCRIPTION The HIT integrates a host of discrete components into a hybrid module and provides the Local Area Network designer with space and cost savings as well as the enhanced reliability of a single component. Since the HIT is a high impedance transceiver, it does not disturb the characteristic impedance of the cable used to interconnect ARCNET nodes. The two far ends of the twisted pair cable must be terminated using terminating resistors equal to the characteristic impedance of the cable. The HIT is made up of a transmit section and a receive section. (Please refer to Figure 1). Transmit Section The ARCNET LAN controller transmits a logic "1" by generating two 100 ns non-overlapping negative pulses, nPULSE1 and nPULSE2. These signals are converted by the HIT into a 200 ns dipulse signal. The HIT shapes the 200 ns signal into a single cycle of a 5 MHz sine-wave and filters higher frequency components. The dipulse signal is then transformer-coupled onto the cable and has a minimum voltage output of 16 Volts peak-to-peak. The exact output voltage of the HIT will vary depending on the characteristic impedance of the cable used. The driving circuitry of the HIT has been designed to present a high impedance on the cable in order to minimize loading. The DISABLE input of the HYC9088 can be used to prevent the device from transmitting. During normal operation, the DISABLE input is tied to ground. Receiver Section The received dipulse signal from the cable is electrically isolated through the use of a transformer. This signal is passed through a filter which eliminates out of band noise. The receive signal is then fed to a comparator which converts it into a TTL signal ready to be applied to the LAN controller chip. The comparator compares the received signal to an internal voltage threshold to distinguish noise from real signal. APPLICATION INFORMATION Small Twisted Pair Networks The HIT eliminates the need for active hubs in small ARCNET networks. For example, a ten node ARCNET network can be constructed by connecting ten HITs using a daisy-chained or bus configuration (see Figure 2). Note that both extremes of the cable must be terminated with a resistor which matches the characteristic impedence of the Twisted Pair Cable. For the cable types specified in Table 1, the maximum length of the twisted pair cable recommended is 400 feet. Small Coax Network No active hub is required for an ARCNET network consisting of eight nodes or less using the HYC9088 for coax cable (See Figure 2A). Both ends of the cable must be terminated with a resistor which matches the characteristic impedance of the coax cable. For the RG62 cable specified in Table 1, the maximum length of the coax cable recommended is 1000 feet. 5 Combination of Twisted Pair and Coax Networks A Two-Port Link is used to combine twisted pair network and a coax network. A Two-Port Link has a coax connector on one side and two modular jacks on the other and contains the proper impedance-matching circuitry. Refer to Figure 3 for an illustration of a twisted pair network combined with a coaxial network. Proper Connection for Twisted Pair Each twisted pair compatible ARCNET node would typically have two RJ-11 modular connectors mounted on the node card (refer to Figure 4). PHASE A should be connected to pin 2 of the connectors and PHASE B to pin 3. A twisted pair segment would have an RJ-11 modular jack on each end (see Figure 5). Please note that the suggested numbering scheme of the modular jack shown in Figure 5 may not be consistent with that found on some manufacturers' products. Please ensure consistent connection of Phase A and Phase B signals throughout the network to avoid the reception of erroneous data. PARAMETER Wiring Number of Twists/Foot DC Resistance Characteristic Impedance Maximum Attenuation Table 1 - Specifications for Cabling VALUE FOR COAX VALUE FOR TWISTED PAIR RG62 N/A 3.4 Ohms/1000 ft. 93 Ohms at 1 MHz 5.5 dB/1000 ft. at 5 MHz Solid Copper 22, 24, or 26 AWG 2 min. 28.6 Ohms/1000 ft. max. 105 Ohms 20% at 1 MHz 16.0 dB/1000 ft. at 5 MHz 6 DISABLE 19 ISOLATION TRANSFORMER nPULSE 1 20 FILTER, AMPLIFIER AND DIFFERENTIAL DRIVER 1 2 5 9 NC NC NC NC nPULSE 2 18 12 PH-A/CENTER 11 PH-B/SHIELD 8 Rx DATA 7 VOLTAGE THRESHOLD DETECTOR FILTER TPA TPB TPC TPD 16 15 10 6 4 3 13 14 17 +5V GND -5V GND GND GND FIGURE 1 - HYC9088 INTERNAL BLOCK DIAGRAM 400 FEET MAXIMUM T T 6 FEET MINIMUM 1 2 3 10 FIGURE 2 - TYPICAL SMALL TWISTED PAIR ARCNET NETWORK USING HYC9088A 7 1000 FEET MAXIMUM 3 FEET MINIMUM T T 1 2 3 8 FIGURE 2A - TYPICAL SMALL COAX ARCNET NETWORK USING HYC9088A 400 FEET MAXIMUM T 1 2 TWISTED PAIR CABLE 6 FEET MINIMUM 3 9 T 10TH CONNECTION TWOPORT LINK COAXIAL CABLE* 3 FEET MINIMUM T d** 1 2 3 1000 FEET MAXIMUM *For more detail, see TN 7-1 **Stub length should be kept as short as possible 7 T 8TH CONNECTION FIGURE 3 - TYPICAL COMBINATION OF TWISTED PAIR AND COAXIAL CABLE ON AN ARCNET NETWORK USING HYC9088A 8 ARCNET NODE 4-Lead Modular Plugs FIGURE 4 - RJ-11 CONNECTORS ON NODE CARD 1 2 3 4* 1 2 3 4* 3 4 2 3 2 3 2 1* 4 *Please note that the numbering scheme of the modular jack shown above is the opposite of that found on Standard Microsystems' Systems Products Division's boards and hubs. Please adhere to one scheme and ensure consistent connection of Phase A and Phase B signals throughout the network for proper operation. FIGURE 5 - PHASE RELATIONSHIP ON TWISTED PAIR SEGMENT AND RJ-11 CONNECTOR PINOUT 3 2 1* 9 +5V + 10 uF 6 nPULSE1 nPULSE2 CONTROLLER/ TRANSCEIVER RXIN GND ARCNET nPULSE1 nPULSE2 RX 4,13,14 17,19 0.47 pF + 10 uF -5V HYC9088A PHASE A/CENTER 12 0.47 pF 5.6K 1/2W 5.6K 1/2W J1* 27 pF 1 2 3 4 PHASE 11 B/SHIELD 3 5.6K 1/2W 5.6K 1/2W 27 pF 1 2 3 J2* 4 *Please see note in Figure 5 regarding the numbering scheme of the modular jack. FIGURE 6 - TYPICAL HYC9088A INTERCONNECT FOR TWISTED PAIR CABLE +5V + 10 uF 6 nPULSE1 nPULSE2 CONTROLLER/ TRANSCEIVER RXIN GND ARCNET nPULSE1 nPULSE2 RX 4,13,14 17,19 0.47 pF + 10 uF -5V HYC9088A PHASE A/CENTER PHASE 11 B/SHIELD 3 5.6K 1/2W 5.6K 1/2W 0.01 uF 1KV 12 0.47 pF FIGURE 7 - TYPICAL HYC9088A INTERCONNECT FOR COAXIAL CABLE TWISTED PAIR CABLE PHASE A/CENTER 12 COAXIAL CABLE PHASE A/CENTER R L TO RJ 11 PHASE 11 B/SHIELD 12 R L PHASE 11 B/SHIELD FIGURE 8 - DESCRIPTION OF TERMINATOR WIRING 10 OPERATIONAL DESCRIPTION MAXIMUM GUARANTEED RATINGS* Operating Temperature Range.....................................................................................................0 C to +70 C o o Storage Temperature Range ..................................................................................................... -55 to +150 C o Lead Temperature Range (soldering, 10 seconds) ...............................................................................+325 C Positive Voltage on any pin, with respect to Ground ...........................................................................Vcc+0.3V Negative Voltage on any pin, except VDD, with respect to Ground ........................................................... -0.3V *Stresses above those listed above could cause permanent damage to the device. This is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied. Note: When powering this device from laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes on their outputs when the AC power is switched on or off. In addition, voltage transients on the AC power line may appear on the DC output. If this possibility exists, it is suggested that a clamp circuit be used. DC ELECTRICAL CHARACTERISTICS (TA = 0 C to 70 C, VCC2 = +5.0 V 5%, VDD = -5.0V 5%) PARAMETER SYMBOL MIN TYP MAX UNITS COMMENTS Low Input Voltage High Input Voltage Received Signal Amplitude Low Output Voltage High Output Voltage Transformer Output VIL VIH VR VOL VOH VT VC ICC IDD PW 190 180 100 2.4 16 8 20 10 4 285 270 2.0 6.0 3.0 0.4 0.8 V V Vp-p Vo-p V V Vp-p VO-p Vp-p mA mA nS One TTL Load One TTL Load Zchr cable = 120 or 93 IIL = -0.8 mA IIH = +0.2 mA o o o o Cable Noise Amplitude VCC Supply Current VDD Supply Current Pulse Width, nPulse 1, n2 Shorting the transformer output may cause permanent damage to the device. 11 HYC9088AR for Right Angle Lead Frame HYC9088AS for Straight Lead Frame HYC9088AS A H HYC9088AR H HYC9088A 1 B 90-105 G J I K SEATING PLANE F DIM A B C D E F G H I J K MIN 2.000 0.625 0.055 0.018 0.120 TYP MAX 2.100 0.650 0.095 0.022 0.135 0.100 0.010 0.070 0.180 0.020 0.400 0.085 NOTE: Dimensions are in inches FIGURE 9 - 20 PIN SIP PACKAGE DIMENSIONS SEATING PLANE E D C G 80 Arkay Drive Hauppauge, NY 11788 (631) 435-6000 FAX (631) 273-3123 Copyright (c) SMSC 2004. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC's website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems Corporation ("SMSC"). Product names and company names are the trademarks of their respective holders. SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT; TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. HYC9088A Rev. 6/15/94 |
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