NE8392C NXP Semiconductors, NE8392C Datasheet

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NE8392C

Manufacturer Part Number
NE8392C
Description
Coaxial Transceiver Interface For Ethernet/thin Ethernet
Manufacturer
NXP Semiconductors
Datasheet

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Philips Semiconductors
DESCRIPTION
The NE8392C Coaxial Transceiver Interface (CTI) is a bipolar
coaxial line driver/receiver 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 50 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
normally available in a standard 16-pin DIP. Power isolation for the
CTI is achieved using DC-to-DC conversion through a power
transformer (see Figure 1, Connection Diagram).
During transmission the jabber timer is initiated to disable the CTI
transmitter in the event of a longer than legal length data packet.
Receive-mode collision detection circuitry monitors the signals on
the coaxial cable to determine the presence of colliding packets and
signals the DTE in the event of a collision. At the end of every
transmission the heartbeat generator creates a pseudo collision for
a short time to ensure that the collision circuitry is functioning
correctly. The heartbeat function can be disabled for repeater
applications.
The CTI is normally part of a three chip set that implements a
complete Ethernet/ Thin Ethernet network interface for a DTE (see
Figure 2, Interface Diagram). The other chips are a Serial Network
Interface (SNI) and a Network Interface Controller (NIC). The SNI
provides Manchester Encoding and Decoding while the NIC handles
the media access protocol and buffer management tasks.
FEATURES
ORDERING INFORMATION
1995 May 1
16-Pin Plastic Dual In-Line Package (DIP)
28-Pin Plastic Lead Chip Carrier (PLCC)
Compatible with Ethernet II IEEE 802.3 10base5 and 10base2,
and ISO 8802/3 interface specifications
100% drop-in compatible with industry standard 8392 sockets
Integrates all transceiver electronics except signal and power
isolation
Only one external resistor required for setting coaxial signaling
current
Jabber timer function integrated on chip
Heartbeat generator can be externally disabled for operation as
IEEE 802.3 compatible repeaters
Coaxial transceiver interface for Ethernet/Thin Ethernet
DESCRIPTION
1
PIN CONFIGURATION
On-chip precision voltage reference for receive mode collision
detection
Squelch circuitry on all signal inputs rejects noise
Full ESD protection
Standard 16-pin DIP and 28-pin PLCC packages
Power-on reset prevents glitches on coaxial cable during power
up.
Also available in advanced low-power BiCMOS technology. (See
selection chart and data sheets for the NE83C92, NE83Q92 or
NE83Q93 for appropriate optimal usages)
TEMPERATURE RANGE
0 to +70 C
0 to +70 C
V
V
V
V
V
V
V
EE
EE
EE
EE
EE
EE
EE
V
V
10
11
CD+
CD–
RX+
RX–
TX+
5
6
7
8
9
TX–
EE
EE
12 13 14 15 16 17 18
4
7
2
3
6
8
1
5
4
N PACKAGE
A PACKAGE
3
2
1
ORDER CODE
NE8392CN
NE8392CA
28
27
14
16 CDS
15 TXO
13 V
12 RR–
11 RR+
10 GND
9
26
Product specification
RXI
HBE
EE
NE8392C
25
24
23
22
21
20
19
853-1693 15180
V
V
V
V
V
V
RR–
EE
EE
EE
EE
EE
EE
SOT261-3
SOT28-4
DWG #
SD00283

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NE8392C Summary of contents

Page 1

... Philips Semiconductors Coaxial transceiver interface for Ethernet/Thin Ethernet DESCRIPTION The NE8392C Coaxial Transceiver Interface (CTI bipolar coaxial line driver/receiver 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) ...

Page 2

... A package, Pins and should similarly be soldered to a large area V 1995 May 1 DESCRIPTION . EE PARAMETER 2 – directly connecting the four center Pins 4, 5, 12, and 13 to the die attachment area. JA and rack Product specification NE8392C and enabled EE RATING UNIT – – –65 to +150 +300 C C +130 ...

Page 3

... HEARTBEAT ENABLE 1995 May 1 LINE DRIVER RECEIVER AC–DC SQUELCH TRANSMITTER TRANSMITTER SQUELCH COLLISION COMPARATOR & HEARTBEAT GENERATOR 10MHz OSC JABBER TIMER DRIVER 3 Product specification NE8392C DTE INTERFACE RECEIVE PAIR (RX+, RX–) TRANSMIT PAIR (TX+, TX–) COLLISION PAIR (CD+, CD–) LINE SD00274 ...

Page 4

... TX+ TX– and V are the max and min voltages at TXO with a 25 load between TXO and MAX MIN min when the idle (no signal) voltage on this pin is –3.7V. TDC . CD 4 Product specification NE8392C LIMITS UNIT UNIT MIN TYP MAX –6.5 V –80 –130 mA mA – ...

Page 5

... 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. FUNCTIONAL DESCRIPTION The NE8392C contains four main functional blocks (see Block Diagram). These are: a. The receiver which takes data from the coaxial cable and sends it to the DTE. ...

Page 6

... Figure 8 illustrates jabber timing. Detection of Coaxial Cable Faults In the NE8392C 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– appears on the coaxial cable and is larger than the receiver squelch threshold V ...

Page 7

... EE2 5 CTI 10 RX– 6 TX+ 7 78Ω TX– Figure 1. Connection Diagram SERIAL (OPTIONAL) NETWORK INTERFACE (AUI CABLE) 7 Product specification NE8392C + – (NOTE 4) 500Ω 500Ω 500Ω 500Ω COAX CDS 16 (NOTE 2) TXO 15 RXI 14 V EE3 RR– ...

Page 8

... Figure 4. Receiver End–of–Packet Timing t +2 TST 100ns Figure 5. Transmitter Timing 1 Figure 6. Collision Timing 8 Product specification NE8392C 90 10 SD00277 SD00279 t TOFF 90 ...

Page 9

... Philips Semiconductors Coaxial transceiver interface for Ethernet/Thin Ethernet + TXO + CD 1995 May HON HW Figure 7. Heartbeat Timing t JR Figure 8. Jabber Timing 9 Product specification NE8392C SD00281 SD00282 ...

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