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
Copyright © 2006 SMSC or its subsidiaries. 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.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
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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
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
T
O
P
V
I
E
W
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.
Revision (01-24-06) Page 5 SMSC HYC9088A
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.
Revision (01-24-06) Page 6 SMSC HYC9088A
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
19
nPULSE 1 20
18
nPULSE 2
Rx
DATA
7
643 131417
+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
FIGURE 1 – HYC9088A INTERNAL BLOCK DIAGRA M
Revision (01-24-06) Page 7 SMSC HYC9088A
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
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
T
123 7
COAXIAL CABLE*
3 FEET
MINIMUM
d**
1000 FEET MAXIM U M
T
123 8
3 FEET
MINIMUM T
Revision (01-24-06) Page 8 SMSC HYC9088A
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
1234
4 3 2 1*
4 3 2 1*
*
32
32
*
*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
A
and Phase B signals throughout the network for proper operation.
Revision (01-24-06) Page 9 SMSC HYC9088A
DATASHEET
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
1234
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 RL
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
VR
2.0
6.0
3.0
0.8 V
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
VT
VC
2.4
16
8
20
10
0.4
4
V
V
Vp-p
VO-p
Vp-p
One TTL Load
One TTL Load
Zchr cable = 120Ω or
93Ω
VCC Supply Current
VDD Supply Current
ICC
IDD
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.
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
E
1
GC
A
D
B
SEATING PLANE F
H
SEATING PLANE
I
JK
90°-105°
DIM
A
B
C
D
E
F
G
H
I
J
K
NOTE: Dimensions are in inches
HYC9088AS
HYC9088A
H
G