Datasheet

2016-2018 Microchip Technology Inc. DS00002202C-page 47
KSZ8081MNX/RNB
10BASE-T Transmit (measured differentially after 1:1 transformer)
V
P
Peak Differential Output Volt-
age
100 termination across dif-
ferential output
2.2 2.8 V
Jitter Added Peak-to-peak 3.5 ns
t
r
, t
f
Rise/Fall Time 25 ns
10BASE-T Receive
V
SQ
Squelch Threshold 5 MHz square wave 400 mV
Transmitter – Drive Setting
V
SET
Reference Voltage of I
SET
R(I
SET
) = 6.49 k 0.65 V
REF_CLK Output
50 MHz RMII Clock Output
Jitter
Peak-to-peak. (Applies only to
KSZ8081RNB in RMII –
25
MHz clock mode)
300 ps
100 Mbps Mode – Industrial Applications Parameters
Clock Phase Delay – XI Input
to MII TXC Output
XI (25 MHz clock input) to MII
TXC (25
MHz clock output)
delay, referenced to rising
edges of both clocks. (Applies
only to KSZ8081MNX in MII
mode)
15 20 25 ns
t
llr
Link Loss Reaction
(Indication) Time
Link loss detected at receive
differential inputs to PHY sig
-
nal indication time for each of
the following:
1. For LED mode 00, Speed
LED output changes from low
(100 Mbps) to high (10 Mbps,
default state for link-down).
2. For LED mode 01, Link
LED output changes from low
(link-up) to high (link-down).
3. INTRP pin asserts for link-
down status change.
4.4 µs
Symbol Parameter Condition Min. Typ. Max. Units