W89C92 반도체 회로 부품 판매점
PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER
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 Winbond |
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W89C92
TRANSCEIVER FOR COAXIAL CABLE (TCC)
GENERAL DESCRIPTION
The W89C92 Transceiver for Coaxial Cable (TCC) serves as an interface between the Attachment
Unit Interface and coaxial cable and implements the MAU functions required by a 10BASE2 or
10BASE5. 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.
FEATURES
• Compatible with IEEE 802.3 10BASE2 and 10BASE5
• CMOS process provides low power consumption
• Mixed-mode circuit design integrates all transceiver electronics except signal and power isolation
and minimizes external component count
• On-chip jabber timer and state machine meet the requirements for IEEE 802.3 MAU function
• External selective SQE test function allows operation with IEEE 802.3 compatible repeater
• Precision detection circuit design implements transmit mode collision detection
• External selective jabber lockup function allows infinite data transmission
• Standard 16-pin DIP and 28-pin PLCC package provide easy implementation of a MAU
PIN CONFIGURATIONS
CC
D SSCT
R
I
+
O
-
O
+
L
S
XN
OC
X
I
4 3 2 1 28 27 26
VSS 5
25 VSS
VSS 6
24 VSS
VSS 7
23 VSS
VSS 8
22 VSS
VSS 9
21 VSS
VSS 10
20 VSS
VSS 11
19 ER-
12 13 14 15 16 17 18
DDDSVV E
I OOQDD R
- + - EDD+
CSO+
CSO-
DI+
VSS
VSS
DI-
DO+
DO-
1
2
3
4
5
6
7
8
16 CLS
15 TXO
14 RXI
13 VSS
12 ER-
11 ER+
10 VDD
9 SQE
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Publication Release Date: September 1994
- 1 - Revision A3
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W89C92
PIN DESCRIPTION
Attachment Unit Interface Pins
CSO+, CSO- (DIP 1, 2/PLCC 2, 3) (O/P): Collision Output Positive, Collision Output Negative
CSO+/CSO- are a differential signal pair that drives 10 MHz signals to the DTE (data transmit
equipment) when a collision is detected on the segment, the DTE transmits an excessively long
packet, or the cable is disconnected. CSO+/CSO- are also active for a period of time after the end of
every transmission. CSO+ and CSO- should be pulled down by a 510 ohm resistor.
DI+, DI- (DIP 3, 6/PLCC 4, 12) (O/P): Data-in Output Positive, Data-in Output Negative
DI+/DI- are also a differential signal pair. Signals received from the network segment that meet the
bandwidth requirement and carrier sense levels will be transferred into differential format and driven
out from DI+/DI-. A 510 ohm pull-down resistor is also required for DI+/DI-.
DO+, DO- (DIP 7, 8/PLCC 13, 14) (I/P): Data-out Input Positive, Data-out Input Negative
Data transmitted from the DTE are received on DO+/DO- and transferred into a current signal on the
coaxial cable.
Coaxial Media Interface Pins
TXO (DIP 15/PLCC 28) (O/P): Transmit Output
The current signal on the coaxial cable is sunk into TXO. TXO is pulled up to VDD internally. A diode
should be used to isolate the TXO capacitance loading from the coaxial cable.
RXI (DIP 14/PLCC 26) (I/P): Receive Input
The signal on RXI is filtered by a low-pass filter and transferred to DI+/DI- with differential format. The
RXI should be connected directly to the coaxial cable.
CLS (DIP 16/PLCC 1) (I/P): Collision Sense Input
The collision detection threshold is determined by the level of the CLS pin. The transmit mode
collision detection of 10BASE2 is implemented when CLS is connected directly to VDD.
Control Pins
ER+, ER- (DIP 11, 12/PLCC 18, 19) (I/P): External Resistor Positive, External Resistor Negative
A fixed 1K 1% ohm resistor should be connected between ER+ and ER- to establish the internal
operating current.
SQE (DIP 9/PLCC 15) (I/P): Signal Quality Error Test
The signal quality error test will be enabled when SQE is tied to VDD. The jabber lockup function can
be disabled by changing the SQE bias.
Power Pins
VDD (DIP 10/PLCC 16, 17) (I/P): Positive Power Supply
A9 VDC power supply is needed.
VSS (DIP 4, 5, 13/PLCC 5 to 11, 20 to 25) (I/P): Negative Power Supply
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( winbond )
W89C92 controller
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[ W89C92.PDF ]
[ W89C92 다른 제조사 검색 ]
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