cy7b8392 Cypress Semiconductor Corporation., cy7b8392 Datasheet - Page 3

• Manufacturer Part Number: cy7b8392
• Description: Ethernet Coax Transceiver Interface
• Manufacturer: Cypress Semiconductor Corporation.

Jabber Function
The on-chip watchdog timer prevents the DTE from locking up
a network by transmitting continuously. When the transmission
exceeds the jabber time limit, the Jabber function disables the
transmitter and sends a 10-MHz signal over the CD pair.
Once the transmitter is in the jabber state, it must remain in the
idle state for 500 ms before it will exit the jabber state.
AUI Function
The CY7B8392 Auto AUI function will isolate the AUI CI port
when coaxial cable is not present. The CY7B8392 monitors
the average DC level at the RXI input and determines if a prop-
Connection Diagram for Standard CY7B8392 Applications
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperature ................................. –65 C to +150 C
Ambient Temperature with
Power Applied ................................................. –0 C to +70 C
Supply Voltage ...............................................................–12V
Input Voltage .................................... GND+0.3V to V
ESD Protection .........................................................2200V
12 to15VDC
COLLISION
TRANSMIT
RECEIVE
PAIR
PAIR
PAIR
NOTE 2
78
78
CABLE
AUI
CONVERTER
T1 (NOTE 3)
1
2
4
5
7
8
DC to DC
100 mA
16
15
13
12
10
9
EE
78
–0.3V
[6]
3
erly terminated coaxial segment is attached. While RXI is un-
terminated the AUI port will remain powered down. The AUI
port will only be activated when RXI is connected to a termi-
nated coaxial segment.
When the RXI input becomes unterminated (after power-up),
a 10-MHz signal is transmitted over the CI circuit for 800 ms.
After the transmission of the 10-MHz signal, the CI port is dis-
abled.
This function allows multiple MAUs to be connected to a single
AUI port without having to turn off the coaxial transceiver man-
ually.
CD+
CD–
Operating Range
RX+
RX–
TX+
TX–
Commercial
Notes:
V
V
2.
3.
4.
5.
6.
EE
EE
78
T1 is a 1:1 pulse transformer, with an inductance of 30 to 100 H.
IN916 or equivalent.
Resistors may be as small as 510 ; larger values may be used to reduce
power dissipation.
HBM measurement exception: HBE and RXI pins ESD protected to
1100V
Range
1
2
3
4
5
6
7
8
CY7B8392
resistors not required if AUI cable not present.
9V (ISOLATED)
+
–
16
15
14
13
12
11
10
510
510
510
510
9
CDS
TXO
RXI
V
RR–
RR+
GND
HBE
EE
Temperature
0 C to +70 C
NOTE 5
Ambient
1K
1%
NOTE 4
8392–4
CY7B8392
–9V
V
COAX
EE
5%