Page 1
INTEGRATED CIRCUITS
NE83Q93
Enhanced coaxial Ethernet transceiver
Product specification
IC19 Data Handbook
1995 May 01
Page 2
Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
DESCRIPTION
The NE83Q93 is a low power 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 (see Figure 3, Connection Diagram).
The part is functionally the same as the NE83Q92, but with
additional features such as a transmit enable input, a carrier detect
output and five status LED driver outputs.
The NE83Q93 is manufactured on an advanced BiCMOS process
and is available in an SOL package making 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
•Functionally compatible with industry standard 8392 applications
•Optimal implementation can use 1 Watt DC-DC converter and
reduces external parts count
•High efficiency AUI drivers minimize current consumption under
idle conditions by automatically powering-down
•Automatically disables AUI drivers when disconnecting coax
cable, allowing hard-wiring of AUI connector and local/integrated
CTI connection
PIN CONFIGURATION
D, N Packages
1
CD+
CD–
RX+
V
EE
V
EE
RX–
TX+
TX–
TEN
XLED
JLED
LCOM
2
3
4
5
6
7
8
9
10
11
12
CDS
24
23
TXO
RXI
22
21
V
20
RR–
RR+
19
GND
18
HBE
17
16
CRS
15
RLED
14
LINK
13
CLED
SD00311
EE
Figure 1. Pin Configurations
•Smart squelch on data inputs eliminates false activations
•Transmit enable input and carrier sense output for repeater
applications
•Five LED status drivers for transmit, receive, collision, jabber and
link fail indication
•Advanced BiCMOS process for extremely low power operation
•Available in 24-pin DIP and 24-pin SOL packages
•Full ESD protection
•Power-on reset prevents glitches on coaxial cable
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
24-Pin Plastic Dual In-Line Package (DIP)
24-Pin Plastic Small Outline Large (SOL) Package
1995 May 01 853-1738 15180
2
0 to +70°C
0 to +70°C
NE83Q93N SOT222–1
NE83Q93D SOT137-1
Page 3
Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
PIN DESCRIPTIONS
PIN NO.
D, N PKG
1
2
3
6
7
8
9 TEN
10 XLED Transmit Indicator. Indicates a packet is being transmitted onto the coaxial cable.
11 JLED Jabber Indicator. Indicates that the jabber timer has timed out and the coaxial driver is disabled.
12 LCOM LED Common. The anodes of all status indicator LEDs are connected to this pin. It’s voltage is VEE + 5V.
13 CLED Collision Indicator . Indicates that a collision has been detected.
14 LINK Link Indicator. Indicates that a connection is present to the coaxial cable network.
15 RLED Receive Indicator . Indicates that a packet is being received from the coaxial cable.
16 CRS
17 HBE
11
12
22 RXI
23 TXO
24 CDS
18 GND Positive Supply Pin.
4
5
21
SYMBOL DESCRIPTION
CD+
CD–
RX+
RX–
TX+
TX–
RR+
RR–
V
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.
Receiver Outputs. Balanced differential line driver outputs which send the received signal to the DTE. External
pull-down resistors are optional.
Transmitter Inputs. Balanced differential line receiver inputs which accept the transmission signal from the DTE
and apply it to the coaxial cable at TXO, if it meets Tx squelch threshold.
Transmit Enable. A CMOS compatible input requiring an input voltage range of VEE to VEE + 5V. The transmitter
and loopback functions are disabled when TEN is LOW and enabled when TEN is HIGH or left floating. TEN is
normally driven through an opto-coupler.
Carrier Sense. A real time output that indicates the presence of a carrier on the coaxial cable. CRS is normally
used to drive an opto-coupler.
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, if 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
NOTE:
1. The IEEE 802.3 name for CD is CI; for RX is DI; for TX is DO.
1995 May 01
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
BLOCK DIAGRAM
COAX
CABLE
DTE
INTERFACE
RXI
TXO
CDS
TEN
HBE
BUFFER
RECEIVER
EQUALIZER
4–POLE BESSEL
LOW PASS FILTER
SENSE
BUFFER
TRANSMITTER
TRANSMITTER
SQUELCH
COLLISION
COMPARATOR
&
HEARTBEAT
GENERATOR
JABBER
TIMER
RECEIVER
SQUELCH
LINE
DRIVER
10MHz
OSC
STATUS
CONTROL
DRIVER
LINE
RECEIVE
PAIR
(RX+, RX–)
CARRIER
SENSE
(CRS)
TRANSMIT
PAIR
(TX+, TX–)
LINK
COLLISION
(CLED)
JABBER
(JLED)
XLED
RLED
LCOM
COLLISION
PAIR
(CD+, CD–)
SD00312
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.
V
= Normal operating supply voltage in volts.
EE
= Percentage of duty cycle idle
n
IDL
n
= Percentage of duty cycle receiving
RX
n
= Percentage of duty cycle transmitting
TX
1
1
2
) + (VEE x 0.027 x nRX) + (VEE x 0.075 x nTX)]
IDL
–12 V
0 to –12 V
+150
°C
°C
°C
°C/W
1995 May 01
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
ELECTRICAL CHARACTERISTICS
4
MAX
CD
1,2
. No external isolation.
Without external
pull-down resistors and
no LED loads
Measured by applying
DC voltage at RXI
(CDS = 0V)
Measured as DC
voltage at RXI
V
RXI
(CDS = 0V)
TX+
OUT
and V
are the max and min voltages at TXO with a 25Ω load between TXO and
MIN
.
LIMITS
–7.5 V
–80 –90 mA
= 0V –2 +25 µA
RXI
= 0V +1 +3 µA
CDS
+2.4 V
EE
+1.6 V
EE
= 0V +10 µA
HBE
HBE
= V
EE
–30 µA
–37 –45 mA
±28 ±I
= –10V –250 +250 µA
TXO
TDC
–3.7 V
–1450 –1530 –1580 mV
–3.5 V
±600 ±1100 mV
±40 mV
average DC
– V
) peak –175 –225 –275 mV
TX–
–150 –250 –350 mV
1 2 pF
6 kΩ
= 8mA V
< VEE + 5 10 µA
OUT
+1.4 V
EE
mA
VEE = –9V ±6%; TA = 0°C to +70°C unless otherwise specified
SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
UVL
Under voltage lockout. Transceiver disabled for
|VEE| < |V
UVL
|
Supply current idle –15 –20 mA
I
I
I
V
V
TENH
V
I
TENL
I
I
I
TX10
V
TCOM
V
V
V
V
V
V
V
R
C
R
R
R
EE
RXI
CDS
IH
V
IL
I
IH
I
IL
TENL
TDC
TAC
CD
DIS
OD
OB
OC
RS
TS
RXI
RXI
TXO
AUIZ
TX
Supply current transmitting (without collision)
Receive input bias current V
Cable sense input bias current V
HBE input HIGH voltage V
HBE input LOW voltage V
HBE input HIGH current V
HBE input LOW current V
Input HIGH voltage at TEN VEE + 2 V
Input LOW voltage at TEN VEE + 1 V
Input LOW current at TEN –50 –100 µA
Transmit output DC current level
Transmit output AC current level
3
3
Transmit current V
Transmitter output voltage compliance
Collision threshold
5
AUI disable voltage at RXI
Differential output voltage – non idle at RX± and
6
CD±
Differential output voltage imbalance – idle at
RX± and CD±
7
Output common mode voltage at RX± and CD± RXI = 0V –4.0 –5.5 –7.0 V
Receiver squelch threshold
Transmitter squelch threshold (V
Shunt resistance at RXI non–transmitting 100 kΩ
Input capacitance at RXI
8
Shunt resistance at TXO transmitting 7.5 10 kΩ
Differential impedance at RX± and CD± with no
coaxial cable connected
Differential impedance at TX± 20 kΩ
LED driver and CRS output
V
OL
I
OL
Output LOW voltage I
Output leakage current inactive VEE < V
NOTES:
1. Currents flowing into device pins are positive. All voltages are referenced to ground unless otherwise specified. For ease of interpretation,
the parameter limit that appears in the MAX column is the largest value of the parameter, irrespective of sign. Similarly, the value in the MIN
column is the smallest value of the parameter, irrespective of sign.
2. All typicals are for V
3. I
is measured as (V
TDC
GND. I
4. The TXO pin shall continue to sink at least I
is measured as (V
TAC
5. Collision threshold for an AC signal is within 5% of V
= –9V and TA = 27°C.
EE
+ V
MAX
)/(2 x 25) where V
MIN
– V
MAX
)/(2 x 25).
MIN
min when the idle (no signal) voltage on this pin is –3.7V .
TDC
6. Measured on secondary side of isolation transformer (see Connection Diagram, Figure 3). The transformer has a 1:1 turns ratio with an
inductance between 30 and 100µH at 5MHz.
7. Measured as the voltage difference between the RX pins or the CD pins with the transformer removed.
8. Not 100% tested in production.
1995 May 01
5
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Philips Semiconductors Product specification
RON
TST
NE83Q93Enhanced coaxial Ethernet transceiver
TIMING CHARACTERISTICS
V
= –9V ±6%; TA = 0 to 70°C, unless otherwise specified1. No external isolation diode on TXO.
EE
LIMITS
SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Receiver start up delay RXI to RX± (Figure 6)
t
RON
First received bit on RX±
First validly timed bit on RX± t
t
t
t
t
t
t
t
RD
RR
RF
OS
RJ
RHI
RM
Receiver prop. delay RXI to RX± V
Differential output rise time on RX± and CD±
Differential output fall time on RX± and C±
2,3
2,3
Differential output settling time on RX± and CD±
to VOB = 40mV2 (see Figure 7)
Receiver and cable total jitter ±2 ±6 ns
Receiver high to idle time Measured to +210mV 200 850 ns
Rise and fall time matching on RX± and CD± tRF – t
Transmitter start–up delay TX± to TXO (Fig. 8)
t
TST
First transmitted bit on TXO
First validly timed bit t
t
TD
t
TR
t
TF
t
TM
t
TS
t
TON
t
TOFF
t
CON
t
COFF
t
CHI
f
CD
t
CP
t
HON
t
HW
t
JA
t
JR
Transmitter prop delay TX± to TXO
(see Figure 8)
Transmitter rise time 10% to 90% (see Figure 8) 20 25 30 ns
Transmitter fall time 10% to 90% (see Figure 8) 20 25 30 ns
tTF – tTR mismatch
Transmitter added skew
5
4,5
Transmitter turn on pulse width (see Figure 8) V
Transmitter turn off pulse width (see Figure 8) VTX± = 1V peak 125 200 ns
Collision turn on delay (see Figure 9) 0V to –2V step at RXI 13 bits
Collision turn off delay (see Figure 9) –2V to 0V step at RXI 16 bits
Collision high to idle time (see Figure 9) Measured to +210mV 200 850 ns
Collision frequency (see Figure 9) 8.5 10 11.5 MHz
Collision signal pulse width (see Figure 9) 35 70 ns
Heartbeat turn on delay (see Figure 10) 0.6 1.6 µs
Heartbeat test duration (see Figure 10) 0.5 1.5 µs
Jabber activation delay measured from TX± to
CD± (see Figure 11)
Jabber reset delay measured from TX± to CD±
(see Figure 11)
LEDs
t
LED
t
XLEDON
t
XLEDOFF
t
RLEDON
t
RLEDOFF
t
CLEDON
t
JLEDON
t
JLEDOFF
Turn-on or turn-off delay of LEDs 10 µs
XLED maximum on time 90 115 135 ms
XLED minimum off time 5 7 10 ms
RLED maximum on time 90 115 135 ms
RLED minimum off time 5 10 ms
CLED minimum on time 10 14 18 ms
JLED maximum on time
JLED minimum off time
NOTES:
1. All typicals are for V
2. Measured on secondary side of isolation transformer (see Figures 3 and 4, Connection Diagram). The transformer has a 1:1 turn ratio with
= –9V and TA = 27°C.
EE
an inductance between 30 and 100µH at 5MHz.
3. The rise and fall times are measured as the time required for the differential voltage to change from –225mV to +225mV, or +225mV to
–225mV, respectively.
4. Difference in propagation delay between rising and falling edges at TXO.
5. Not 100% tested in production.
V
= –2V peak 3 5 bits
RXI
+2 bits
RON
= –2V peak 20 50 ns
RXI
5 7 ns
5 7 ns
1 µs
RR
0.1 ±2 ns
VTX± = –1V peak 1 2 bits
+ 2 bits
TST
VTX± = 1V peak 5 20 50 ns
0 ±2 ns
0 ±2 ns
= 1V peak 10 35 ns
±
TX
20 60 ms
250 650 ms
1995 May 01
6
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
FUNCTIONAL DESCRIPTION
The NE83Q93 is a low power BiCMOS coaxial Ethernet transceiver
which complies with the IEEE 802.3 specification and offers a
number of additional features. These features are:
1. Low current consumption of typically 15mA when idle and 80mA
while transmitting without collision allows smaller DC-DC
converter to be used for the isolated power supply (no external
pull-down resistors).
2. Automatic selection between AUI cable and coaxial connections
by placing the AUI outputs in a high impedance state when the
coaxial cable is disconnected. This eliminates the need for
changing a jumper position on the Ethernet board when selecting
either Thin Ethernet or remote transceiver connections.
3. High efficiency AUI drivers for the RX± and CD± ports
automatically power down when idling and are powered-up when
a receive signal is detected. This is very important/useful for
power sensitive applications such as lap-top computers or
PCMCIA cards.
4. The NE83Q93 advanced AUI driver (RX± and CD±) design
requires no external pull-down resistors (500Ω) to drive a
terminated (78Ω) AUI cable and still meets the IEEE 802.3
specification. The drivers will also operate correctly if external
resistors are present, so that they can be retro-fitted into existing
8392 designs. However, an extra current of 7mA/output (for
500Ω resistors) would be generated, by these resistors,
regardless of whenther the transceiver is idle or responding to
traffic.
5. Transmit enable input and carrier sense output for direct use in
repeater applications.
6. LED control circuitry and drivers for indicating the transmit,
receive, collision, jabber and link status of the transceiver unit.
Receiver Functions
The receiver consists of an input buffer , a cable equalizer, a 4-pole
Bessel low pass filter, a squelch circuit and a differential line driver.
The buffer provides high input resistance and low input capacitance
to minimize loading and reflections on the coaxial cable.
The equalizer is a high pass filter that compensates for the low pass
effect of the coaxial cable and results in a flatband response over all
signal frequencies to minimize signal distortion.
The 4-pole Bessel low pass filter extracts the average DC voltage
level on the coaxial cable for use by the receiver squelch and
collision detection circuits.
The receiver squelch circuit prevents noise on the coaxial cable
from falsely triggering the receiver in the absence of a true signal.
At the beginning of a packet, the receiver turns on when the DC
level from the low pass filter exceeds the DC squelch threshold and
the received packet has started with a 01 bit sequence with
acceptable timing parameters. For normal signal levels this will take
less than 500ns, or 5 bits. However, at the end of a packet, a fast
receiver turn off is needed to reject both dribble bits on the coaxial
cable and spurious responses due to settling of the on-chip
bandpass filter. This is accomplished by an AC timing circuit that
disables the receiver if the signal level on the coaxial cable remains
high for typically 250ns and only enables the receiver again after
approximately .5µs. Figures 6 and 7 illustrate receiver timing.
The differential line driver provides typically ±
DTE with less than 7ns rise and fall times. When in idle state (no
received signal) its outputs provide <20mV differential voltage offset
to minimize DC standing current in the isolation transformer.
900mV signals to the
Transmitter Functions
The transmitter has differential inputs and an open collector current
driver output. The differential input common mode voltage is
established by the CTI and should not be altered by external
circuitry. Controlled rise and fall times of 25ns (±5ns) minimize
higher harmonic components in the transmitted spectrum, while
matching of these rise and fall times to typically 2ns minimizes
signal jitter. The drive current levels of the CTI are set by an on-chip
bandgap voltage reference and an external 1% resistor. An on-chip
isolation diode is provided to reduce the transmitter’s coaxial cable
load capacitance. For Thin Ethernet applications, no further external
isolation diode is required, since the NE83Q93 meets the capacitive
loading specifications. For Ethernet applications a further external
diode should be added to reduce loading capacitance.
The transmitter squelch circuit ensures that the transmitter can only
be enabled if the transmitted packet begins with a 01 bit sequence
where the negative-going differential signals are typically greater
than 225mV in magnitude and 25ns in duration.
The transmitter will be disabled at the end of a packet if there are no
negative going signals of greater than 225mV for more than typically
150ns. Figure 8 illustrates transmitter timing.
Collision Functions
The collision detection scheme implemented in the NE83Q93 is
receive mode detection, which detects a collision between any two
stations on the network with certainty at all times, irrespective of
whether or not the local DTE is producing one of the colliding
signals. This is the only detection scheme allowed by the IEEE
802.3 standard for both repeater and non-repeater nodes.
The collision circuitry consists of the 4-pole Bessel low pass filter, a
comparator, a precision voltage reference that sets up the collision
threshold, a heartbeat generator, a 10MHz oscillator, and a
differential line driver .
The collision comparator monitors the DC level at the output of the
low pass filter and enables the line driver if it is more negative than
the collision threshold. A collision condition is indicated to the DTE
by a 10MHz oscillation signal at the CD outputs and typically occurs
within 700ns of the onset of the collision. The collision signal begins
with a negative-going pulse and ends with a continuous high-to-idle
state longer than 170ns. Figure 9 illustrates collision timing.
At the end of every transmission, the heartbeat generator creates a
pseudo collision to ensure that the collision circuitry is properly
functioning. This pseudo collision consists of a 1µs burst of 10MHz
oscillation at the line driver outputs approximately 1µs after the end
of the transmission. The heartbeat function can be disabled
externally by connecting the HBE (heartbeat enable) to V
allows the CTI to be used in repeater applications. Figure 10
illustrates heartbeat timing.
EE
. This
Jabber Functions
The jabber timer monitors the transmitter and inhibits transmission if
it is active for longer than typically 30ms. The jabber circuit then
enables the collision outputs for the remainder of the data packet
and for typically 450ns (unjab time) after it has ended. At this point
the transmitter becomes uninhibited. Figure 11 illustrates jabber
timing.
1995 May 01
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
Control Interface Signals
The NE83Q93 provides two input and one output signal for mode
control and interfacing within repeaters. The output signal is Carrier
Sense (CRS) and the input signals are Heartbeat Enable (HBE) and
Transmit Enable (TEN).
The HBE input controls the transmission of the heartbeat (or SQE)
signal to the DTE for testing the collision detection function. It is
normally hardwired to V
1. The heartbeat (SQE) function is DISABLED when HBE is
connected to V
2. The heartbeat (SQE) function is ENABLED when HBE is
connected to GND or left floating
The TEN input controls the coaxial transmitter. It is a CMOS
compatible input requiring a driving signal with a voltage range of
V
to VEE + 5V. It is normally driven through an opto-coupler to
EE
provide electrical isolation. A typical application circuit is shown in
Figure 4.
1. The coaxial transmitter is DISABLED when a LOW is applied to
TEN or it is directly connected to V
function of the NE83Q93 occurs through the coaxial connection
the loopback function is also disabled.
2. The coaxial transmitter is ENABLED when a HIGH is applied to
TEN or it is directly connected to GND or left floating.
The CRS output indicates the presence of a carrier signal on the
coaxial cable. It is open drain output designed to drive the LED of
an opto-coupler connected between CRS and LCOM through a
current limiting series resistor. A LOW at CRS is V
the voltage at LCOM (V
1. CRS is HIGH (no current) when no carrier is present
2. CRS is LOW (current sinking) when carrier is present
On applying a HIGH to TEN through an opto-coupler the transmitter
is enabled but it still has to recognize the normal squelch-qualified
01 bit sequence with the negative-going differential signals meeting
the necessary magnitude and duration requirements. The set-up
time needed from application of a HIGH at TEN to recognizing the
first 01 bit sequence is typically 25ns. The propagation delay
through an opto-coupler is of the order of 200ns.
EE
or GND.
EE
+ 5V).
EE
. Since the loopback
EE
and a HIGH is
EE
AUI Selection/Under Voltage Lockout
The transmit and receive squelch circuits of the NE83Q93 remain
active if the absolute value of V
under voltage lockout, V
on either the AUI or coaxial cable during power up and power down.
There is no collision announcement during power up and the
transceiver waits for 400ms before becoming enabled.
If RXI is disconnected from the coaxial cable after power up, its
voltage will fall towards V
exceeds the AUI disable voltage, V
transmit and receive squelch circuits remain active and, in addition,
the AUI drivers become high impedance. This permits AUI
connections to be hard wired together, e.g., the coaxial transceiver
and a 10BASE-T transceiver, with the signal path determined by
which transceiver is connected to its external cable.
UVL
EE
is less than the threshold for
EE
. This prevents glitches from appearing
. If the absolute value of this voltage
, for longer than 800ms, the
DIS
There is a 400ms collision announcement on disconnecting RXI, but
there is no announcement on re-connection. This feature can be
disabled by pulling RXI up with a 200kΩ to ground.
Detection of Coaxial Cable Faults
In the NE83Q93 there is no internal loopback path from the TX
inputs to the RX outputs. This means that, when the local DTE is
transmitting, the signal will only be present at the receiver outputs
RX+ and RX– if it appears on the coaxial cable and is larger than
the receiver squelch threshold V
occurs at the cable connector to the CTI, then no signal will appear
at the receiver outputs.
In the case of an open circuit at the coaxial cable connector there
will also be no signal at the receiver outputs due to the AUI disabling
mode of the NE83Q93. However, a heartbeat signal will be present
following a transmission attempt for the short circuit condition, but
not for the open circuit.
A coaxial cable with only a single 50Ω termination will generate a
collision not only at every transmission attempt, but also for every
reception attempt due to the receive mode collision detection of the
NE83Q93.
. If a short circuit fault condition
RS
Status Indicator Functions
The NE83Q93 provides five status outputs, the open drain device
connected to each is capable of directly driving an LED or
opto-coupler, or other logic circuits if an external pull-up resistor is
used. The functional descriptions below are for an LED connected
between the output and LCOM (V
series resistor.
The LINK signal indicates the status of the coaxial connection.
+ 5V) through a current limiting
EE
•The LED is ON when the transceiver is connected to a properly
terminated coaxial cable.
•The LED is OFF when the coaxial cable is disconnected from the
transceiver, or if the coaxial connection is unterminated.
The XLED signal indicates the status of the transmitter.
•The LED is OFF when there is no transmission in progress
•The LED is turned ON when data is being transmitted and
remains ON for typically 115ms.
The RLED signal indicates the status of the receiver.
•The LED is OFF when no signal is being received.
•The LED is turned ON when data is received and remains ON for
typically 115ms.
The CLED signal indicates the status of the collision detection
circuit.
•The LED is OFF for no collision.
•The LED turns ON when a collision is detected and remains ON
for typically 12ms after the end of the collision.
•In the event of another collision during the latter 6ms of the 12 ms
delay period after the end of the last collision, the LED will turn off
for typically 6ms then back ON to indicate the new collision.
The JLED signal indicates the status of the jabber control circuit.
•The LED is OFF for a no-jab condition.
•The LED turns ON when the coaxial transmitter output is jabbed.
•The LED turns back off when the transmitter is unjabbed.
1995 May 01
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
AUI
CABLE
12 TO 15V DC
COLLISION
PAIR
DTE
RECEIVE
PAIR
TRANSMIT
PAIR
78Ω
(NOTE 3)
78Ω
DC TO DC
CONVERTER
<200mA
1
2
T1 (NOTE 1)
4
5
7
8
+
9V (ISOLATED)
–
(NOTE 4)
500Ω
16
15
13
12
10
9
78Ω
CD+
CD–
RX+
V
V
RX–
TX+
TX–
EE
EE
1
2
3
NE83C92
4
5
6
7
8
CTI
16
15
14
13
12
11
10
500Ω
500Ω
500Ω
9
CDS
TXO
RXI
V
EE
RR–
RR+
GND
HBE
COAX
(NOTE 2)
200kΩ
1kΩ 1%
(NOTE 5)
NOTES:
1. T1 is a 1:1 pulse transformer, with an inductance of 30 to 100µH.
2. IN916 or equivalent for Ethernet, not required for Thin Ethernet.
3. 78Ω resistors not required if AUI cable is not used, i.e., local transceiver.
4. Typical pull-down resistors are not required for either 10BASE2 or 10BASE5 application. Remove them for minimum current consumption.
5. Install 200kΩ to disable the 400ms collision announcement when disconnecting cable.
Figure 3. Connection Diagram for Standard 8392 Applications
SD00313
1995 May 01
9
Page 10
Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
NE83Q93
+5V
OPTO-ISOLATOR
CARRIER
DETECT
(TTL/CMOS)
SD00314
TRANSMIT
ENABLE
(TTL/CMOS)
+5V
OPTO-ISOLATOR
V
EE
LCOM
V
EE
CTI
CRS
16
RLED
15
LINK
14
TEN CLED
913
LCOM
12
JLED
11
XLED
10
Figure 4. Control Interface Connections
COAX
NE83Q93
COAX
TRANSCEIVER
INTERFACE
MAU = Medium Attachment Unit
AUI Cable = Attachment Unit Interface Cable (not used in Thin Ethernet applications)
MAU
I
S
O
L
A
T
I
O
N
(OPTIONAL)
(AUI CABLE)
Figure 5. Interface Diagram for Ethernet/Thin Ethernet Local Area Network
RXI
RX
1234567891011
+
PHASE VIOLATION
ALLOWED
t
RON
Figure 6. Receiver Timing
t
RON
SERIAL
NETWORK
INTERFACE
NETWORK
INTERFACE
CONTROLLER
DTE
VALID
TIMING
567891011
+2
t
RD
90%
10%
t
t
RF
TF
t
t
RR
TR
B
U
S
SD00315
SD00306
1995 May 01
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
RXI
RXI
RX
+
t
RHI
t
OS
SD00279
Figure 7. Receiver End–of–Packet Timing
t
+2
TST
TX+
TXO
t
TD
100ns
t
TF
t
t
RR
TR
t
TST
1234567891011
t
TON
1234567 891011
90%
10%
t
RF
t
TOFF
SD00305
Figure 8. Transmitter T iming
0V
CD+
TX+
CD+
–2V
t
CON
1/F
CD
Figure 9. Collision Timing
t
HON
Figure 10. Heartbeat Timing
t
COFF
t
CP
t
HW
t
CHI
SD00280
SD00281
1995 May 01
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
TX+
t
JA
t
JR
TXO
CD+
SD00282
Figure 11. Jabber T iming
TX,
RX
T
XLED,
RLED
(LCOM)
(V
EE
)
XLEDON
T
RLEDON
T
XLEDOFF
T
RLEDOFF
(COLLISION)
CLED
(JABBER ON)
JLED
COAX
LINK
(LED)
RX
(LCOM)
CRS
(VEE)
CD
(LCOM)
(V
)
EE
CD
(LCOM)
(V
(LCOM)
(VEE)
EE
T
CLEDON
)
T
CLEDON
JABBER
LED ON
LINE
DISCONNECTED
LINK
LED OFF
T
CLEDON
SD00510
Figure 12. LED Timing
1995 May 01
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
DIP24: plastic dual in-line package; 24 leads (300 mil) SOT222-1
1995 May 01
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
SO24: plastic small outline package; 24 leads; body width 7.5 mm SOT137-1
1995 May 01
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Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
NOTES
1995 May 01
15
Page 16
Philips Semiconductors Product specification
NE83Q93Enhanced coaxial Ethernet transceiver
Data sheet status
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
[1]
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one
or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can
reasonably be expected to result in personal injury . Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
print code Date of release: 08-98
Document order number:
1995 May 01
16
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