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ML4664CH Scheda tecnica(PDF) 3 Page - Micro Linear Corporation

Il numero della parte ML4664CH
Spiegazioni elettronici  10BASE-FL to 10BASE-T Converter
Download  16 Pages
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Produttore elettronici  MICRO-LINEAR [Micro Linear Corporation]
Homepage  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4664CH Scheda tecnica(HTML) 3 Page - Micro Linear Corporation

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ML4664/ML4669
PIN
NAME
FUNCTION
1(29)
CTIMER
A capacitor from this pin to VCC
determines the Link Monitor response
time.
2(30)
LTF
Link Test Fail. Active high. Normally
this pin is low, indicating that the link
is operational. If the link goes down
resulting from the absence of link
pulses or frames being received, the
chip will go into the Link Test Fail
state and bring LTF high.
When the ML4664 is in the link test
fail state, the optical and twisted pair
transmitters are disabled from sending
data. However, the optical transmitter
does send an idle signal, and link
pulses are sent at the twisted pair
transmitter. When the ML4669 is in
link test fail state, the optical and
twisted pair transmitters are disabled
from sending data. Also, the optical
transmitter will not send an idle
signal. However, link pulses may be
sent at the twisted pair transmitter,
depending on the optical inputs. See
Table 1.
This pin may be grounded to disable
Link Test. In this mode no link pulses
are sent and the link will not fail if no
link pulses are received. If this pin is
not used as an LED driver, and is not
grounded, a 2k
W 5% resistor should
be connected between this pin and
VCC.
3(31)
TPLED
Indicates that reception is taking place
on the TPINP, TPINN pair. Active low
LED driver, open collector. It is
extended 16ms for visibility.
Optionally, this pin may be grounded
to disable the optical output. If this
pin is not used as an LED driver and is
not grounded, a 2k
W, 5% resistor
should be connected between TPLED
and VCC.
4(32)
TPINP
Twisted Pair receive data input.
5(1)
TPINN
When this signal exceeds the
receive squelch requirements the
receive data is buffered and sent
to the Rx± outputs.
6(3)
VCC
5V input
14(12)
PIN DESCRIPTION (Pin Number in Parentheses is for TQFP Version)
PIN
NAME
FUNCTION
7(4)
TxCAP0
An external capacitor of 680pF is
8(5)
TxCAP1
tied between these two pins to set
the pulse width for the pre-
equalization on the twisted pair
transmitter. If these two pins are
shorted together, no pre- equalization
occurs. If the ML4664/ML4669 is
driving only a short cable, or board
traces, these pins may be shorted.
9(6)
GND
Ground reference
20(18)
10(7)
TPOUTN Pre-equalized differential balanced
11(8)
TPOUTP current driven output. These outputs
are connected to a balanced transmit
output filter which drives the twisted
pair cable through pulse transformers.
The output current is set with an
external resistor connected to RTSET
allowing the chip to drive 100
W
unshielded , 150
W shielded twisted
pair cables or a range of other
characteristic impedances.
12(10) POLDIS
Receive Polarity status. Active low
LED Driver, open collector output.
Indicates the polarity of the receive
twisted pair regardless of auto polarity
correction. When low, receive polarity
is reversed. When high, receive
polarity is correct. This pin may be
grounded to disable the polarity
circuit. If this pin is not used as an
LED driver, and is not grounded, a
2k
W, 5% resistor should be connected
between this pin and VCC.
13(11) RTSETTP When using 100
W unshielded twisted
pair, a 220
W resistor is tied between
this pin and VCC. When using 150W
shielded twisted pair, a 330
W resistor
is tied between this pin and VCC.
15(13) RRSET
A 1% 61.9k
W resistor tied from this
pin to VCC is used for internal biasing.
16(14) RTSETOP Sets the current driven output of the
transmitter. A 115
W resistor should be
tied between this pin and VCC.


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