PDF HYC9088A Data sheet ( Hoja de datos )

Número de pieza	HYC9088A
Descripción	ARCNET TWISTED PAIR AND COAXIAL COMPLATIBLE HIGH IMPEDANCE TRANSCEIVER HIT
Fabricantes	SMSC Corporation
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No Preview Available ! www.DataSheet4U.com 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 on the cable and converts them into TTL signals to Compatible High Impedance Transceiver (HIT) is be supplied to the LAN controller. a hybrid module that interfaces an ARCNET Local Area Network controller to one twisteDd aptaiSr hoeret4U.TchoemHIT supports ARCNET's Dipulse Encoding coaxial cable. The HIT interfaces directly with Scheme and, is 100% compatible with all existing Standard Microsystems Corporation's ARCNET coax-based ARCNET networks. This provides an LAN controllers operating at 2.5 Mbps and ARCNET network designer with flexibility to easily connects to a variety of shielded and unshielded combine coax and twisted pair cabling. twisted pair or coaxial cables via an on-board transformer. The network topologies supported by The HYC9088 is pin compatible with the HYC9058 the HIT are daisy chain, star, and bus High Impedance Transceiver and is pin compatible configurations. with the HYC9068 LAN Driver with the addition of a single terminating resistor. 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 DataShee DataSheet4U.com DataSheet4 U .com DataSheet4U.com 1 page www.DataSheet4U.com 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). 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 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 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. et4U.com APPLICATION INFORMATION Small Twisted Pair Networks Small Coax Network DataSheet4U.com The HIT eliminates the need for active hubs in No active hub is required for an ARCNET network small ARCNET networks. For example, a ten consisting of eight nodes or less using the node ARCNET network can be constructed by HYC9088 for coax cable (See Figure 2A). Both connecting ten HITs using a daisy-chained or bus ends of the cable must be terminated with a configuration (see Figure 2). Note that both resistor which matches the characteristic extremes of the cable must be terminated with a impedance of the coax cable. For the RG62 cable resistor which matches the characteristic specified in Table 1, the maximum length of the impedence of the Twisted Pair Cable. For the coax cable recommended is 1000 feet. cable types specified in Table 1, the maximum length of the twisted pair cable recommended is 400 feet. DataShee 5 DataSheet4U.com DataSheet4 U .com DataSheet4U.com 5 Page www.DataSheet4U.com et4U.com OPERATIONAL DESCRIPTION MAXIMUM GUARANTEED RATINGS* Operating Temperature Range.....................................................................................................0oC to +70oC Storage Temperature Range ..................................................................................................... -55o to +150oC Lead Temperature Range (soldering, 10 seconds) ...............................................................................+325oC 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 = 0oC to 70oC, VCC2 = +5.0 V ± 5%, VDD = -5.0V ± 5%) PARAMETER SYMBOL MIN TYP MAX UNITS COMMENTS Low Input Voltage VIL 0.8 V IIL = -0.8 mA High Input Voltage VIH 2.0 V IIH = +0.2 mA Received Signal Amplitude Low Output Voltage VR 6.0 3.0 VOL Vp-p Vo-p 0.4 V One TTL Load High Output Voltage Transformer Output VOH 2.4 VTDataShe1e6t4U.co2m0 8 10 V One TTL Load Vp-p Zchr cable = 120Ω or VO-p 93Ω Cable Noise Amplitude VCC Supply Current VC ICC 4 190 285 Vp-p mA VDD Supply Current IDD 180 270 mA Pulse Width, nPulse 1, n2 PW 100 nS Shorting the transformer output may cause permanent damage to the device. DataShee 11 DataSheet4U.com DataSheet4 U .com DataSheet4U.com 11 Page

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