Datasheet

TUSB1210
SLLSE09F –NOVEMBER 2009–REVISED AUGUST 2012 www.ti.com
Table 6-10. FS Transmitter
PARAMETER COMMENTS MIN TYP MAX UNIT
V
OL
Low Ref. USB2.0 0 300 mV
V
OH
High (driven) Ref. USB2.0 2.8 3.6 V
Ref. USB2.0, covered by eye 1.3 2 V
VCRS Output signal crossover voltage
diagram
t
FR
Rise time Ref. USB2.0 4 20 ns
t
FF
Fall time Ref. USB2.0 4 20 ns
t
FRFM
Differential rise and fall time matching Ref. USB2.0, covered by eye 90 111.1 %
diagram 1
Z
DRV
Driver output resistance Ref. USB2.0 28 44 Ω
TFDRATE Full-speed data rate Ref. USB2.0, covered by eye 11.97 12.03 Mb/s
diagram
T
DJ1
To next transition Ref. USB2.0, covered by eye -2 2 ns
Source jitter total (including
diagram
frequency tolerance)
T
DJ2
For paired transitions -1 1
TFEOPT Source SE0 interval of EOP Ref. USB2.0, covered by eye 160 175 ns
diagram
Downstream eye diagram Ref. USB2.0, covered by eye
diagram
Upstream eye diagram
6.3.3.4 HS Differential Receiver
The HS receiver consists of the following blocks:
A differential input comparator to receive the serial data
• A squelch detector to qualify the received data
• An oversampler-based clock data recovery scheme followed by a NRZI decoder, bit unstuffing, and
serial-to-parallel converter to generate the ULPI DATAOUT
Table 6-11. HS Differential Receiver
PARAMETER COMMENTS MIN TYP MAX UNIT
VHSSQ High-speed squelch detection threshold Ref. USB2.0 100 150 mV
(differential signal amplitude)
VHSDSC High-speed disconnect detection threshold Ref. USB2.0 525 625 mV
(differential signal amplitude)
High-speed differential input signaling levels Ref. USB2.0, specified by eye pattern mV
templates
VHSCM High-speed data signaling common mode Ref. USB2.0 -50 500 mV
voltage range (guidelines for receiver)
Receiver jitter tolerance Ref. USB2.0, specified by eye pattern 150 ps
templates
6.3.3.5 HS Differential Transmitter
The HS transmitter is always operated via the ULPI parallel interface. The parallel data on the interface is
serialized, bit stuffed, NRZI encoded, and transmitted as a dc output current on DP or DM depending on
the data. Each line has an effective 22.5-Ω load to ground, which generates the voltage levels for
signaling.
A disconnect detector is also part of the HS transmitter. A disconnect on the far end of the cable causes
the impedance seen by the transmitter to double thereby doubling the differential amplitude seen on the
DP/DM lines.
22 USB Connectivity Copyright © 2009–2012, Texas Instruments Incorporated
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