|Category||Communication => Network => Ethernet/DS1/E1 (T1/E1) => Framers/Mappers|
|Company||Philips Semiconductors (Acquired by NXP)|
|Datasheet||Download NE83C92A datasheet
The 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 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. 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.FEATURES
reduces external part count (local/integrated MAU requires no external pull-down resistors).
High efficiency AUI drivers automatically power-down under idle
Automatically disabling AUI drivers when disconnecting coax
cable, allowing hardwiring of AUI connection and local/integrated CTI connection
Available in 16-pin DIP, and 28-pin PLCC packages Expanded version (NE83Q93) with 5 LED status drivers is Full ESD protection Power-on reset prevents glitches on coaxial cable duringpower-up available for repeater and advanced system applications
Smart squelch on data inputs eliminates false activations Advanced BiCMOS process for extremely low power operationDESCRIPTION 16-Pin Plastic Dual In-Line Package 28-Pin Plastic Leaded Chip Carrier
PIN NO. N PKG PIN NO. PLCC to 25 SYMBOL DESCRIPTION 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. 1k (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. Positive Supply Pin.RECEIVER ACDC SQUELCH TRANSMIT PAIR (TX+, TX)
COLLISION COMPARATOR & HEARTBEAT GENERATOR 10MHz OSC JABBER TIMER LINE DRIVER COLLISION PAIR (CD+, CD)SYMBOL VEE VIN TSTG TSOLD TJ JA Supply voltage1 PARAMETER RATING 65 to UNIT V
Voltage at any input1 Storage temperature range Lead soldering temperature (10sec.) Recommended max junction temperature2 Thermal impedance (N and A packages)
NOTE: 1. 100% measured in production. 2. The junction temperature is calculated from the following expression: + JA [(VEE 0.015 x nIDL) + (VEE 0.018 x nRX) + (VEE 0.066 x nTX)] where TA = Ambient temperature in °C. JA = Thermal resistance of package. VEE = Normal operating supply voltage in volts. nIDL = Percentage of duty cycle idle nRX = Percentage of duty cycle receiving nTX = Percentage of duty cycle transmitting 1995 May 1 3
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