Datasheet

78Q2120C
10/100BASE-TX
Transceiver
Page: 28 of 35 © 2009 Teridian Semiconductor Corporation Rev 1.3
100BASE-TX Receiver
PARAMETER CONDITION MIN NOM MAX UNIT
Signal Detect Assertion Threshold
500 600 700 mVppd
Signal Detect De-assertion Threshold 275 350 425 mVppd
Differential Input Resistance 20
kΩ
Jitter Tolerance (pk-pk) Not tested in production 4 ns
Baseline Wander Tracking -75 +75 %
Signal Detect Assertion Time Not tested 1000
µs
Signal Detect De-assertion Time Not tested 4
µs
10BASE-T Transmitter
The Manchester-encoded data pulses, the link pulse and the start-of-idle pulse are tested against the templates
and using the procedures found in Clause 14 of IEEE 802.3.
PARAMETER CONDITION MIN NOM MAX UNIT
Peak Differential Output Signal
(see note below)
All data patterns 2.2 2.8 V
Harmonic Content
(dB below fundamental)
All ones data
Not tested
27 dB
Link Pulse Width 100 ns
Start-of-Idle Pulse Width Last bit 0
Last bit 1
300
350
ns
ns
Note: Measured at the line side of the transformer.
Test Condition: Transformer P/N: TLA-6T103
Line Termination: 100Ω ±1%