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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. arcnet is a registered trademark of datapoint corporation. hit is a trademark of standard microsystems corporation.
2 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 80 arkay drive hauppauge, ny 11788 (516) 435-6000 fax (516) 273-3123
3 pin configuration 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 package: 20-pin sip ordering information: HYC9088AR for right angle lead frame hyc9088as for straight lead frame t o p v i e w pin 1 designator
4 description of pin functions pin no. name sym bol description 1, 2, 5, 9 no connect nc not used. make no connection to these pins. 3 power supply vdd -5 volts power supply. 4, 13, 14, 17 ground gnd ground. 6 power supply vcc +5 volts power supply. 7 receive data rx output. this signal carries the ttl receive pulse information to the arcnet lan controller device. 8, 16, 15, 10 test points tpa, tpb, tpc, tpd test points. make no connection to these pins. 11 phase-b/ shield ph-b/ shield output. connect this signal to twisted pair connector pin 3 or the shield of the coaxial cable. 12 phase-a/ center ph-a/ center output. connect this signal to twisted pair connector pin 2 or the center of the coaxial cable. 18 npulse 2 npulse2 input. this signal is supplied by the arcnet lan controller device. 19 disable tx disable transmit input. a high level on this signal disables the transmit section of the hyc9088. it is normally connected to ground. 20 npulse 1 npulse1 input. this signal is supplied by the arcnet lan controller device.
5 functional descrip tion 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.
6 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. table 1 - specifications for cabling parameter value for coax value for twisted pair wiring rg62 solid copper 22, 24, or 26 awg number of twists/foot n/a 2 min. dc resistance 3.4 ohms/1000 ft. 28.6 ohms/1000 ft. max. characteristic impedance 93 ohms at 1 mhz 105 ohms 20% at 1 mhz maximum attenuation 5.5 db/1000 ft. at 5 mhz 16.0 db/1000 ft. at 5 mhz
7 figure 1 ? hyc9088 internal block diagram figure 2 ? typical small twisted pair arcnet network using hyc9088a filter isolation transformer disable 19 npulse 1 20 18 npulse 2 rx data 7 6 4 3 13 14 17 +5v gnd -5v gnd gnd gnd tpa tpb tpc tpd 8 16 15 10 11 ph-b/shield 12 ph-a/center nc nc nc 1 2 9 filter, amplifier and differential driver voltage threshold detector nc 5 400 feet maximum 1 3 2 10 t t 6 feet minimum
8 figure 2a ? typical small coax arcnet network using hyc9088a figure 3 ? typical combination of twisted pair and coaxial cable on an arcnet network using hyc9088a t t t 1 2 3 9 two- port link 10th connection 8th connection 400 feet maximum twisted pair cable 6 feet minimum 1000 feet maximum *for more detail, see tn 7-1 **stub length should be kept as short as possible t 1 2 3 7 coaxial cable* 3 feet minimum d** 1000 feet maximum t 1 2 3 8 3 feet minimum t
9 figure 4 ? rj-11 connectors on node card figure 5 ? phase relationship on twisted pair segment and rj-11 connector pinout arcnet node 4-lead modular plugs 1 2 3 4 1 2 3 4 4 3 2 1 * 4 3 2 1 * * 3 2 3 2 * *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.
10 figure 6 ? typical hyc9088a interconnect for twisted pair cable figure 7 ? typical hyc9088a interconnect for coaxial cable figure 8 ? description of terminator wiring 1 2 3 4 1 2 3 4 j1* j2* 27 pf 27 pf 5.6k 1/2w 5.6k 1/2w 5.6k 1/2w 5.6k 1/2w 12 11 phase a/center phase b/shield 0.47 pf + 10 uf 0.47 pf + 10 uf 3 +5v -5v 6 npulse1 npulse2 rx 4,13,14 17,19 npulse1 npulse2 rxin gnd arcnet controller/ transceiver hyc9088a *please see note in figure 5 regarding the numbering scheme of the modular jack. 0.01 uf 5.6k 1/2w 5.6k 1/2w 12 11 phase a/center phase b/shield 0.47 pf + 10 uf 0.47 pf + 10 uf 3 +5v -5v 6 npulse1 npulse2 rx 4,13,14 17,19 npulse1 npulse2 rxin gnd arcnet controller/ transceiver hyc9088a 1kv 12 11 phase a/center phase b/shield coaxial cable 12 11 phase a/center phase b/shield twisted pair cable to rj 11 r l r l
11 operational description maximum guaranteed ratings * operating temperature range ................................ ................................ ......................... 0 o c to +70 o c storage temperature range ................................ ................................ .......................... -55 o to +150 o c lead temperature range (soldering, 10 seconds) ................................ ................................ .... +325 o c positive voltage on any pin, with respect to ground ................................ ................................ v cc +0.3v negative voltage on any pin, except v dd , 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 (t a = 0 o c to 70 o c, v cc2 = +5.0 v 5%, v dd = -5.0v 5%) parameter symbol min typ max units comments low input voltage high input voltage received signal amplitude v il v ih v r 2.0 6.0 3.0 0.8 v v v p -p v o -p i il = -0.8 ma i ih = +0.2 ma low output voltage high output voltage transformer output cable noise amplitude v ol v oh v t v c 2.4 16 8 20 10 0.4 4 v v v p -p v o-p v p -p one ttl load one ttl load z chr cable = 120 w or 93 w v cc supply current v dd supply current i cc i dd 190 180 285 270 ma ma pulse width, npulse 1, n2 pw 100 ns shorting the transformer output may cause permanent damage to the device.
figure 9 ? 20 pin sip package dimensions standard microsystems corp. circuit diagrams utilizing smsc products are included as a means of illustrating typical applications; consequently complete information sufficient for construction purposes is not necessarily given. the information has been carefully checked and is believed to be entirely reliable. however, no responsibility is assumed for inaccuracies. furthermore, such information does not convey to the purchaser of the semiconduc tor devices described any licenses under the patent rights of smsc or others. smsc reserves the right to make changes at any time in order to improve design and supply the best product possible. smsc products are not designed, intended, authorized or warranted for use in any life support or other applications 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. hyc9088a rev. 6/15/94 min 2.000 0.625 0.055 0.018 0.120 0.070 typ 0.100 0.010 0.180 max 2.100 0.650 0.095 0.022 0.135 0.400 0.085 0.020 HYC9088AR for right angle lead frame hyc9088as for straight lead frame HYC9088AR e 1 g c a d b seating plane f h s e a t i n g p l a n e i j k 90-105 dim a b c d e f g h i j k note: dimensions are in inches hyc9088as hyc9088a h g

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