KS8737 Micrel Inc, KS8737 Datasheet - Page 6

• Manufacturer Part Number: KS8737
• Manufacturer: Micrel Inc

Specifications of KS8737

• Lead Free Status / RoHS Status: Not Compliant

KS8737
Note 1.
KS8737
Pin Number
21
23
25
27
28
29
30
32
34
38
39
40
41
42
44
45
46
47
48
49
50
51
54
P = power supply
G = ground
I = input
O = output
I/O = bi-directional
FXMODEB
PWRDWN
Pin Name
LEDLINK
LEDSPD
LEDCOL
LEDACT
LEDFDX
CRSDV
RXDV/
FIBIM
MDIO
RXD3
RXD2
RXD1
RXD0
FIBIP
TST2
ISET
RXM
MDC
TXM
RXP
RXC
TXP
Type
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
(Note 1)
I
I
I
I
I
I
Pin Function
Twisted Pair Transmit Outputs. Differential transmit outputs for 100BaseTX
or 10BaseT to magnetic.
Transmit Current Set. Connecting an external reference resistor to set transmitter
output current. This pin connected to a 22.1k 1% resistor to ground if a
transformer of 1:1 turns ratio is used.
Fiber Receive Inputs. Differential pseudo-ECL receive pairs compatible with
standard fiber transceiver for 100BaseFX. Both pins should be tied to ground if
not used or if not in the FX mode.
Twisted Pair Receive Input. Differential receive input pins for 100BaseTX or
10BaseT from the magnetics.
Test Pin. During normal operation this pin should be left open. When tied high
through a 1k resistor the chip will operate in back to back TX to FX mode. In this
case, TXC becomes an input pin.
Power Down Select Input. When this pin is tied high, the chip is in power down
mode. When this pin is open or tied low, the chip is in normal operation..
LED Output. During normal operation, this pin lights the SPEED LED to indicate
100Mbps is selected. This pin becomes an I/O pin for factory testing in the test
mode. Active Low.
LED Output. During normal operation, this pin lights the COL LED to indicate a
collision. It will flash at a rate of 50ms high and 50ms low when active. This pin
becomes an I/O pin for factory testing in the test mode. Active Low.
LED Output. During normal operation, this pin lights the LINK LED to indicate a
good link is detected. This pin becomes an I/O pin for factory testing in the test
mode. Active Low.
LED Output. During normal operation, this pin lights the Activity LED when
transmitting or receiving. It will flash at a rate of 50ms high and 50ms low when
active. This pin becomes an I/O pin for factory testing in the test mode. Active
Low.
LED Output. During normal operation, this pin lights the FDX LED to indicate a
full-duplex mode. This pin becomes an I/O pin for factory testing in the test mode.
Active Low.
Serial Management Data Input/Output. This pin requires an external 10k pull-up
resistor.
Serial Management Interface Clock Input. This pin is synchronous to the MDIO
data interface.
FX Mode Select Input. Active Low. When this pin is low, the KS8737 is in the
100BaseFX mode.
MII Receive Data Output. Active High, clocked out on the falling edge of RXCLK.
RXD0 is the LSB. High impedance when PHY is isolated or if RXEN is de-
asserted.
MII Receive Data Valid Output. Active High, clocked out on the falling edge of
RXCLK. This signal indicates that recovered and decoded data nibbles are being
presented synchronously to RXCLK. High impedance when PHY is isolated or if
RXEN is de-asserted.
MII Receive Clock Output. 25MHz in 100BaseTX mode, 2.5MHz in 10BaseT
nibble mode. High impedance when PHY is isolated or if RXEN is de-asserted.
6
August 2003
Micrel