W89C92 Information Storage Devices, Inc, W89C92 Datasheet
W89C92
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W89C92 Summary of contents
Page 1
... The W89C92 provides transmit, receive, jabber lockup, SQE test, and collision presence functions. The W89C92 provides a functional solution for a 10BASE2 or 10BASE5 MAU. The power isolation requirement of the MAU is met by using a DC-to-DC converter and a one-to-one ratio transformer. Compatible with IEEE 802.3 10BASE2 and 10BASE5 ...
Page 2
... The signal quality error test will be enabled when SQE is tied disabled by changing the SQE bias. V (DIP 10/PLCC 16, 17) (I/P): Positive Power Supply DD A9 VDC power supply is needed. V (DIP 4, 5, 13/PLCC 25) (I/P): Negative Power Supply SS . The jabber lockup function can W89C92 internally. A diode ...
Page 3
... GND Line Driver Coax. Twisted pair Line W89C92 Transceiver Coax. Cable Isolation W89C905 TELISA Host Bus DI+ RX DI- RXB Receiver Squelch Collision Threshold CSO MHz Oscillator CSO- CDB State Machine TX DO+ Transmit Squelch TXB DO- Publication Release Date: September 1994 - 3 - W89C92 for Revision A3 ...
Page 4
... The differential pair driver (DI+/DI-) then sends a differential signal corresponding to the AC signal on the coaxial cable. The receiver of the W89C92 receives the signal on the coaxial cable regardless of whether the signal is sent by the W89C92 itself or by another MAU. The receiver of the W89C92 performs a loopback function when the W89C92 is transmitting. ...
Page 5
... Transmit propagation delay TD T Transmit rise time, 10 Transmit fall time, 90% to 10% TF -1.43 500 - -3.0 -175 (non-transmitting (transmitting 7 0.6 0.8 20 250 Publication Release Date: September 1994 - 5 - W89C92 -1.53 -1. 800 1500 - mV 60 -3.5 -4.0 V -225 -330 mV -80 -100 mA -120 -150 TDC 5 - ...
Page 6
... RD T Diff. output rise time RR T Diff. output fall time RF T Receiver jitter RJ Notes: 1. All voltages are referenced to ground. All currents into device pin are defined as positive. 2. All typical values are given for V = -9V and 140 250 W89C92 360 nS 5 bits ...
Page 7
... RXI T RON DI+/- DO+/- TON T TST TXO Input Step Function C = 510 RXI CSO+/- TOFF TD 90% 10% 50 W89C92 RXI CSO Collision Output Detector R and C network simulates worst case cable 98% step response (max) V (min CON T COFF Publication Release Date: September 1994 - 7 - W89C92 Revision A3 ...
Page 8
... Timing Waveforms, continued DO+/- CSO+/- DO+/- T JA TXO CSO+/- Transmit Output (TXO) 25 ohms The 50 H inductance is for testing purposes. Pulse transformers with higher inductances are recommended SQEON SQED T JR Receive (DI+/-) Collision (CSO+/-) 510 ohms 510 ohms W89C92 78 ohms ...
Page 9
... Input Signal with 30 nS Rise and Fall Times An external MAU can be implemented using the W89C92 and power supply, which may be a DC-to-DC converter. A 12V to 9V DC-to-DC converter is recommended for recovering the voltage drop through the 50-meter AUI twisted pair cable. A 0.1 F decoupling capacitor connected between the 9V output and ground of the converter is recommended ...
Page 10
... The overlapped power and ground copper plane form a coupling capacitor that can decouple high frequency noise on the power line. The -9V DC and ground must be as close as possible to V and V of the W89C92 to reduce line inductance. A good power plane layout will DD SS improve the MTBF of the W89C92. ...
Page 11
... Input 6 -9V Output . Collision Pair Receive EQUIV Transmit 8 9 Pair Shields . .01 uF 11, 14 Shielded Enclosure + 9 V (Isolated) 510 Each - CLS CSO TXO CSO- 1N4148 2 15 RXI DI DO- SQE 8 9 Publication Release Date: September 1994 - 11 - W89C92 COAX Revision A3 ...