Philips NE83C92N, NE83C92A Datasheet
INTEGRATED CIRCUITS
NE83C92
Low-power coaxial Ethernet transceiver
Product specification
IC19 Data Handbook
1995 May 01
Philips Semiconductors Product specification
NE83C92Low-power coaxial Ethernet transceiver
DESCRIPTION
The NE83C92 is a low power BiCMOS coaxial transceiver interface
(CTI) for Ethernet (10base5) and Thin Ethernet (10base2) local area
networks. The CTI is connected between the coaxial cable and the
Data Terminal Equipment (DTE) and consists of a receiver,
transmitter, receive-mode collision detector, heartbeat generator and
jabber timer (see Block Diagram). The transmitter output connects
directly to a doubly terminated 50Ω cable, while the receiver output,
collision detector output and transmitter input are connected to the
DTE through isolation transformers. Isolation between the CTI and
the DTE is an IEEE 802.3 requirement that can be met on signal
lines by using a set of pulse transformers. Power isolation for the
CTI is achieved using DC-to-DC conversion through a power
transformer.
The part is fully pin compatible with the industry standard 8392, but
has substantially lower current consumption, is fully compliant with
the IEEE802.3 standard, and has additional features such as
automatic selection between AUI and coaxial connections, and
requires no external pull-down resistors for local integrated MAU
application.
The NE83C92 is manufactured on an advanced BiCMOS process
and is available with PLCC package which make it ideally suited to
lap-top personal computers or systems where low power
consumption, limited board space and jumperless design is
required. Refer to selection flow chart for optimal application.
FEA TURES
•Fully compliant with Ethernet II, IEEE 802.3 10BASE-5 and
10BASE-2, and ISO 8802/3 interface specifications
•100% drop-in compatible with industry standard 8392 sockets
•Optimal implementation can use 1 Watt DC-DC converter and
reduces external part count (local/integrated MAU requires no
external pull-down resistors).
•High efficiency AUI drivers automatically power-down under idle
conditions to minimize current consumption
•Automatically disabling AUI drivers when disconnecting coax
cable, allowing hardwiring of AUI connection and local/integrated
CTI connection
•Smart squelch on data inputs eliminates false activations
•Advanced BiCMOS process for extremely low power operation
PIN CONFIGURATION
N Packages
16
CD+
CD–
RX+
V
V
RX–
TX+
TX–
1
2
3
4
EE
5
EE
6
7
8
CDS
15
TXO
14
RXI
V
13
EE
12
RR–
11
RR+
10
GND
9
HBE
A PACKAGE
RXI
RX+
CD–
CD+
V
5
EE
V
6
EE
V
7
EE
V
8
EE
V
9
EE
V
10
EE
V
11
EE
12 13 14 15 16 17 18
TX–
TX+
RX–
1234
CDS
HBE
TXO
GND
N/C
GND
262728
25
24
23
22
21
20
19
RR+
SD00308
V
EE
V
EE
V
EE
V
EE
V
EE
V
EE
RR–
Figure 1. Pin Configurations
•Available in 16-pin DIP, and 28-pin PLCC packages
•Expanded version (NE83Q93) with 5 LED status drivers is
available for repeater and advanced system applications
•Full ESD protection
•Power-on reset prevents glitches on coaxial cable during
power-up
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
16-Pin Plastic Dual In-Line Package
28-Pin Plastic Leaded Chip Carrier
1995 May 01 853-1736 15180
2
0 to +70°C
0 to +70°C
NE83C92N SOT38-4
NE83C92A SOT261-3
Philips Semiconductors Product specification
NE83C92Low-power coaxial Ethernet transceiver
PIN DESCRIPTIONS
PIN NO.
N PKG
1
2
3
6
7
8
9 15 HBE
11
12
14 26 RXI
15 28 TXO
16 1 CDS
10
4
5
13
NOTE:
1. The IEEE 802.3 name for CD is CI; for RX is DI; for TX is DO.
PIN NO.
PLCC
12
13
14
18
19
16
17
5 to 11
20 to 25 V
SYMBOL DESCRIPTION
2
3
4
CD+
CD–
RX+
RX–
TX+
TX–
RR+
RR–
GND Positive Supply Pin.
Collision Outputs. Balanced differential line driver outputs which send a 10MHz signal to the DTE in
the event of a collision, jabber interrupt or heartbeat test. External pull-down resistors are optional with
local/integrated MAU application.
Receiver Outputs. Balanced differential line driver outputs which send the received signal to the DTE.
External pull-down resistors are optional with local/integrated MAU application.
Transmitter Inputs. Balanced differential line receiver inputs which accept the transmission signal from
the DTE and apply it to the coaxial cable at TXO, once it meets Tx squelch threshold.
Heartbeat Enable. The heartbeat function is disabled when this pin is connected to VEE and enabled
when connected to GND or left floating.
External Resistor. A 1kΩ (1%) resistor connected between these pins establishes the signaling current
at TXO.
Receiver Input. This pin is connected directly to the coaxial cable. Received signals are equalized,
amplified, and sent to the DTE through the RX± pins, once it meets Rx squelch threshold.
Transmitter Output. This pin is connected directly (Thin Ethernet) or through an external isolating
diode (Ethernet) to the coaxial cable.
Collision Detect Sense. Ground sense connection for the collision detection circuitry. This pin should
be connected directly to the coaxial cable shield for standard Ethernet operation.
Negative Supply Pins.
EE
1995 May 01
3
Philips Semiconductors Product specification
NE83C92Low-power coaxial Ethernet transceiver
BLOCK DIAGRAM
COAX
CABLE
RXI
BUFFER
EQUALIZER
4–POLE BESSEL
LOW PASS FILTER
TXO
CDS
SENSE
BUFFER
HEARTBEAT ENABLE
RECEIVER
AC–DC SQUELCH
TRANSMITTER
TRANSMITTER
SQUELCH
COLLISION
COMPARATOR
&
HEARTBEAT
GENERATOR
JABBER
TIMER
RECEIVER
LINE
DRIVER
10MHz
OSC
LINE
DRIVER
DTE
INTERFACE
RECEIVE
PAIR
(RX+, RX–)
TRANSMIT
PAIR
(TX+, TX–)
COLLISION
PAIR
(CD+, CD–)
SD00274
Figure 2. Block Diagram
ABSOLUTE MAXIMUM RATINGS
SYMBOL PARAMETER RATING UNIT
V
EE
V
IN
T
STG
T
SOLD
T
J
θ
JA
NOTE:
1. 100% measured in production.
Supply voltage
Voltage at any input
Storage temperature range –65 to +150
Lead soldering temperature (10sec.) +300
Recommended max junction temperature
Thermal impedance (N and A packages) 60
2. The junction temperature is calculated from the following expression:
TJ = TA + θ
where
[(VEE x 0.015 x n
JA
TA = Ambient temperature in °C.
θJA = Thermal resistance of package.
= Normal operating supply voltage in volts.
V
EE
n
= Percentage of duty cycle idle
IDL
= Percentage of duty cycle receiving
n
RX
n
= Percentage of duty cycle transmitting
TX
1
1
2
) + (VEE x 0.018 x nRX) + (VEE x 0.066 x nTX)]
IDL
–12 V
0 to –12 V
+150
°C
°C
°C
°C/W
1995 May 01
4
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