83C694 ETC, 83C694 Datasheet - Page 14

• Manufacturer Part Number: 83C694
• Description: TWISTED PAIR INTERFACE AND MACHESTER ENCODER/DECODER
• Manufacturer: ETC

PIN DESCRIPTION
NUMBER
10 – 13
PIN
14
15
8
9
LNK
TPOL
GND
RLED
XLED
MNEMONIC
TABLE 3-1. PIN DESCRIPTION cont.
TwPr Link Status
TwPr Link Polarity
Negative Supply
Receive LED
Driver
Transmit LED
Driver
SIGNAL NAME
I/O
O
O
O
O
If valid data or Link Test pulses are received
on TPR+/TPR-, LNK is low (link status OK).
When no data or Link Test pulses are re-
ceived, LNK is high. The LNK pin can sink
10mA to drive an external LED.
TPOL is low when positive polarity Link Test
pulses or data packets are received on
TPR+/TPR- (normal operation). TPOL is high
when negative polarity Link Test pulses or
data packets are received (link wiring polarity
reversed). When TPOL is low, it can sink
10mA to drive an external LED.
Pin 10 provides negative supply for analog
circuits. Pin 11 provides negative supply for
digital circuits. Pin 12 provides negative sup-
ply for digital/pad circuits. Pin 13 provides
negative supply for VCO circuits.
When active low, RLED sinks 10 mA to drive
an external LED. If no data is received, RLED
is high. If data is received, RLED will go low
for approximately 50ms longer than the re-
ceived packet length.
All LED current is controlled internally and
requires no external resistors between the
chip and an external LED.
The external LED must be connected from
+5V to the device pin. If LEDs are not used,
then the four pins can be used as logic out-
puts.
When active low, XLED sinks 10mA to drive
an external LED. When there is no transmis-
sion (TXE inactive), XLED is high. When data
is transmitted, XLED goes active low for ap-
proximately 50ms longer than the transmitted
packet length. XLED does not go active low
for Link Test pulses.
DESCRIPTION
83C694D
11