“TnT” - Thinnet Transceiver
Complete “On-Board” Thinnet Solution
RoHS
Compliant
Conflict
FREE
Product Features:
Compliant with ANSI/IEEE802.3 and ISO8802-3
Standards for Thin Net
DC/DC Converter.
Contains all Thin Net Transceiver Functions in
a Single 20-pin Package.
Squelch Circuits on All Signal Inputs to Elimi-
nate Noise
Heartbeat Function Enable/Disable
Part Number
MD-001HRL
MD-002HRL
MD-003HRL
MD-004HRL
MD-012HRL
MD-013HRL
MDQ-001HRL
Input
Voltage
5V
±5%
5V
±5%
3.3V
±5%
3.3V
±5%
12V
±5%
12V
±5%
5V
±5%
(Max. @ 20MHz)
Vee Ripple
100mVpp
100mVpp
100mVpp
100mVpp
100mVpp
100mVpp
40mVpp
Input Current
(max)
Operating
Temp.
0 to 70°C
0 to 70°C
0 to 70°C
0 to 70°C
0 to 70°C
0 to 70°C
0 to 70°C
Storage
Temp.
-40 to +125°C
-40 to +125°C
-40 to +125°C
-40 to +125°C
-40 to +125°C
-40 to +125°C
-40 to +125°C
Enable
Feature
No
Yes
No
Yes
No
Yes
No
225mA
235mA
340mA
340mA
110mA
115mA
225mA
Notes:
1. Please contact the factory or representative for individual datasheets or additional information.
2. Surface mount options also available.
HALO’s Commitment to Long Term Availability
The transceiver chip inside of the HALO TnT module is the H83C92. Over the years, the IC industry has either discontin-
ued or announced End of Life (EOL) of the 83C92 ICs traditionally used in Thinnet applications. The IEEE802.3 compliant
H83C92 transceiver chip has been developed by HALO to provide long term availability of the TnT module family.
For additional information contact your
local representative,
or HALO’s support staff at (650) 903-3800 or
info@haloelectronics.com
HALO’s “TnT” Thin Net Transceiver Modules
Typical Applications:
• Backplane Applications
• Network Interface Cards
• 10BASE-T Hub with 10BASE2 Interface
• 10BASE2 Repeaters
• Thin Net Transceivers
• Print Servers
• Applications Requiring “Optional” 10BASE2 Ports
Dimensions: inch [mm]
Description of Pin Functions
Pins 1 - 2 CD±
Collision.
A balanced 10MHz differential
output from the module to the station equip-
ment when a collision is detected, when exces-
sive data occurs (jabber) or during the SQE Test
(Heartbeat Test).
Pins 3 - 4 RX±
Receive Data.
A balanced line driver
output from the module to the station equip-
ment providing received data detected on the
network.
Pins 5 - 6 TX±
Transmit Data.
A balanced line receiver
input to the module from the station equipment
to drive transmit data onto the network.
Pin 9
Pin 10
VCC ±5%
Input Supply.
(Please refer to the
Module Descriptions)
GND
Ground.
Ground is referenced to the
VCC. (Do not connect this ground to CABLE
SHIELD since the COAX SHIELD must be iso-
lated from the station equipment).
VEE
Negative Supply.
Nominally -9 volts refer-
enced to coax shield ground.
NC
No Connection.
(Optional Enable feature
- Module is off when a “0” signal is supplied.
-
plied).
HBE
Heartbeat Enable.
This input enables the
SQE (also called Heartbeat) Test when con-
nected to (isolated) ground and disables the
test when connected to VEE. This pin must be
connected to VEE for repeater applications.
Pin 17
TXO
Network Signal Transmitter.
Connects
to the network COAX center conductor through
an internal 1N916 diode, and transmits all sig-
nals from the MCC to the network.
RXI
Network Signal Receiver.
Connects to the
network COAX center conductor, and receives
packet data and detects the collision voltage
levels.
CDS
Collision Detect Sense.
Connects directly
to the network shield and references the colli-
sion detection voltage level.
Pin 18
Pin 20
Pin 11
Pin 12
Pin 16
For additional information contact your
local representative,
or HALO’s support staff at (650) 903-3800 or
info@haloelectronics.com
HALO’s “TNT” Thin Net Transceiver Modules
“TNT” Application Notes
1. The HALO Electronics “TNT” family of modules is available with 3.3V, 5V, 8V or 12V input voltages. Care should be
taken to connect the module to the correct supply voltage.
-
3. RXI and TXO (Pins 17 and 18) must be tied together externally at the BNC connector. The 1N916 diode is contained
within the TNT module.
4. For repeater applications, the SQE Test (Heartbeat Test) must be disabled. This is accomplished by connecting Pin 16
(HBE) to Pin 11 (VEE). For non-repeater applications Pin 16 (HBE) should be connected to isolated ground (CDS). It is not
-
mum capacitor is also recommended for safety considerations.
6. The TNT module should be located as close to the BNC connector as possible. This will assure the lowest shunt ca-
pacitance. IEEE 802.3 requires a maximum of 8pF shunt capacitance. Please see paragraph 10.6.3 and Appendix C3.
7. A de-coupling capacitor between VCC and GND is helpful to minimize noise on the supply line.
-
8. Additional surge protection components are recommended for applications where higher voltage static surge is a
concern. Please contact the factory for additional information.
HALO
®
Electronics is a leading supplier of high quality communication magnetics
2880 Lakeside Drive #116
Santa Clara, CA 95054
(650) 903-3800
www.haloelectronics.com
DC/DC converters, and integrated Ethernet connectors. HALO’s leading edge
technology solutions are manufactured in ISO9001 and ISO14001 factories
offering high quality products at a competitive price.
© Copyright 2014 HALO Electronics, Inc. All rights reserved.
Revised 4/2014 Download the latest version at
www.haloelectronics.com/pdf/discrete-tnt.pdf
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