HYC9088AR-LF - Standard Microsystems Corp.

SMSC HYC9088A Revision (01-24-06)

DATASHEET

HYC9088A

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

• 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 HYC9088A 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 ARCNET 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 ARCNET 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 netw ork designer with fl exibility to easily combine coax and twisted pair cabling.

ORDERING INFORMATION

Order Number(s):

HYC9088A R for right angle lead frame (leaded)

HYC9088A R-LF for right angle lead frame (green, lead-free)

Revision (01-24-06) Page 2 SMSC HYC9088A

DATASHEET

80 Arkay Drive

Hauppauge, NY 11788

(631) 435-6000

FAX (631) 273-3123

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.s msc .c om. SMSC is a reg is ter ed t rademark 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 LIM ITATION 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.

Revision (01-24-06) Page 3 SMSC HYC9088A

DATASHEET

PIN CONFIGURATION

VDD

GND

VCC

TPA

TPD

PH-B/SHIELD

PH-A/CENTER

GND

TPC

TPB

GND

nPULSE2

DISABLE

nPULSE1

PACKAGE: 20-Pin SIP

Pin 1 Designator

Revision (01-24-06) Page 4 SMSC HYC9088A

DATASHEET

DESCRIPTION OF PIN FUNCTIONS

PIN NO. NA ME SYMBOL 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 T wisted 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.

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DATASHEET

FUNCTIONAL DESCRIPTION

The HYC9088A 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-w a ve 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 tw isted 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.

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 w ith a coaxial network.

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DATASHEET

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 VA LUE 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

FILTER

ISOLATION

TRANSFORMER

DISABLE

nPULSE 1 20

nPULSE 2

DATA

643 131417

+5V GND -5V GND GND GND

TPA

TPB

TPC

TPD

11 PH-B/SHIELD

12 PH-A/CENTER

FILTER,

AMPLIFIER

AND

DIFFERENTIAL

DRIVER

VOLTAGE

THRESHOLD

DETECTOR

FIGURE 1 – HYC9088A INTERNAL BLOCK DIAGRA M

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DATASHEET

FIGURE 2 – TYPICA L SMALL TWISTED PAIR ARCNET NETWORK USING HYC9088A

FIGURE 2A – TYPICAL SMALL COAX A RCNET NETWORK USING HYC9088A

FIGURE 3 – TYPICA L COMBINATION OF TWISTED PA IR AND COAXIA L CABLE ON AN A RCNET NETWORK

USING HYC9088A

400 FEET MA XIMUM

13210

T T

6 FEET

MINIMUM

T T

123 9

TWO-

PORT

LINK

10TH CONNECTION

8TH CONN ECTION

400 FEET MAXIMUM

TWISTED PAIR CABLE

6 FEET

MINIMUM

1000 FEET MAXIMUM

*For more d etail, se e TN 7-1

**Stub length should be k ept as short as possible

123 7

COAXIAL CABLE*

3 FEET

MINIMUM

d**

1000 FEET MAXIM U M

123 8

3 FEET

MINIMUM T

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DATASHEET

FIGURE 4 – RJ-11 CONNECTORS ON NODE CA RD

FIGURE 5 – PHA SE RELATIONSHIP ON TWISTED PAIR SEGMENT AND RJ-11 CONNECTOR PINOUT

ARCNET NODE

4-Lead Mod ular Plugs

1234

4 3 2 1*

*Please note that the numbering scheme of the modular jack show n above is the

opposite ofthatfoundonStandardMicrosystems' SystemsProducts Division's boards

and hubs. Please adhere to one scheme and ensure consistent connection of Phase

and Phase B signals throughout the network for proper operation.

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FIGURE 6 – TYPICA L HYC9088A INTERCONNECT FOR TWISTED PAIR CABLE

FIGURE 7 – TYPICAL HYC9088A INTERCONNECT FOR COAXIAL CA BLE

FIGURE 8 – DESCRIPTION OF TERMINA TOR WIRING

1234

J1*

J2*

5.6K

1/2W

5.6K

1/2W

5.6K

1/2W

5.6K

1/2W

PHASE

A/CENTER

PHASE

B/SHIELD

0.47

pF +

0.47

+5V

-5V

nPULSE1

nPULSE2

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

5.6K

1/2W

5.6K

1/2W

PHASE

A/CENTER

PHASE

B/SHIELD

0.47

pF +

0.47

+5V

-5V

nPULSE1

nPULSE2

4,13,14

17,19

nPULSE1

nPULSE2

RXIN

GND

ARCNET

CONTROLLER/

TRANSCEIVER

HYC9088A

1KV

PHASE

A/CENTER

PHASE

B/SHIELD

COAXIAL CABLE

PHASE

A/CENTER

PHASE

B/SHIELD

TWISTED PAIR CABLE

TO RJ

11 RL

Revision (01-24-06) Page 10 SMSC HYC9088A

DATASHEET

OPERATIONAL DESCRIPTION

MA XIMUM GUARANTEED RATINGS*

Operating Temperature Range.....................................................................................................0oC to +70oC

Storage Temperature Range.....................................................................................................-55o to +150 oC

Lead Temperature Range (soldering, 10 seconds)...............................................................................+325oC

Positive Voltage on any pin, w ith respect to Ground...........................................................................Vcc+0.3V

Negative Voltage on any pin, except VDD, w i th 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 ELECTRICA L CHARA CTERISTICS (TA = 0 oC to 70oC, 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

VIL

VIH

2.0

6.0

3.0

0.8 V

Vp-p

Vo-p

IIL = -0.8 mA

IIH = +0.2 mA

Low Output Voltage

High Output Voltage

Transformer Output

Cable Noise Amplitude

VOL

VOH

2.4

0.4

Vp-p

VO-p

Vp-p

One TTL Load

Zchr cable = 120Ω or

93Ω

VCC Supply Current

VDD Supply Current

ICC

IDD

190

180

285

270

Pulse Width, nPulse 1, n2 PW 100 nS

Shorting the transformer output may cause permanent damage to the device.

Revision (01-24-06) Page 11 SMSC HYC9088A

DATASHEET

FIGURE 9 – 20 PIN SIP PA CKAGE DIMENSIONS

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

SEATING PLANE F

SEATING PLANE

90°-105°

DIM

NOTE: Dimensions are in inches

HYC9088AS

HYC9088A