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參數(shù)資料
| 型號： | W89C92P |
| 英文描述： | 10M CMOS Coaxial Transceiver |
| 中文描述： | 1000萬的CMOS收發(fā)同軸 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 169K |
| 代理商： | W89C92P |
W89C92
Publication Release Date: September 1994
- 9 -
Revision A3
Timing Waveforms, continued
Test Conditions
Input Signal with 30 nS
Rise and Fall Times
R = 1K
RXI
C = 36 pF
Output
W89C92
Receiver
DO+/-
R and C network
simulates worst case
cable jitter
APPENDIX
External MAU Implementation
An external MAU can be implemented using the W89C92 and a 9V DC 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
μ
F decoupling capacitor connected between
the 9V output and ground of the converter is recommended.
The isolation requirement between DTE and MAU can be met using a one-to-one ratio pulse
transformer or a set of coupling capacitors. Recommended transformers are Pulse Engineering
#64103, Valor Electronics #1101, or an equivalent, and the recommended capacitor is 0.1
μ
F/1 KV.
The pull-down resistor for the differential output pair (CSO+/-, DI+/-) should be 500 ohms to drive the
78 ohm AUI twisted pair line with sufficient voltage swings. A 78 ohm resistor should be shunted
between the differential receive pair (DO+/-) to match the impedance of the AUI cable. To establish
the proper operating point of the W89C92, a precision 1K 1% ohm resistor should be connected
between ER+ and ER-.
A voltage divider is used to program the SQE test function and the jabber lockup function. The SQE
test function can be disabled by connecting SQE to V
SS
. The jabber lockup function is disabled when
the SQE is set to between -3.4V and -5.4V. The CLS of the W89C92 should be connected to V
DD
to
allow the W89C92 to detect collision conditions in transmit mode. Other settings on CLS will not
guarantee that the W89C92 will detect collisions correctly.
A diode should be used to isolate the capacitance loading from the cable. The input capacitance of
the 1N4148 diode is 2pF, which meets the input impedance required for the IEEE 802.3 10BASE5
MAU function. A 1M shunt resistor and a 0.01
μ
F/1 KV shunt capacitor between the coaxial cable
ground and DTE ground will provide the DC and AC discharge path for the external MAU.
Internal MAU Implementation
An internal MAU is embedded in the DTE, so the AUI cable and 78 termination resistor are not
needed. A 5V to 9V DC-to-DC converter can be used as the power supply instead of the 12V to 9V
converter.
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