Datasheet

TPS65930/TPS65920
SWCS037G–MAY 2008– REVISED APRIL 2011 www.ti.com
Table 7-5. HS Differential Receiver
Parameter Comments Min Typ Max Unit
Input Levels for HS
HS squelch detection threshold V
HSSQ
(Differential signal amplitude) 100 125 150 mV
HS disconnect detection threshold V
HSDSC
(Differential signal amplitude) 525 600 625 mV
HS data signaling common mode voltage V
HSCM
–50 200 500 mV
range
HS differential input sensitivity V
DIHS
(Differential signal amplitude) –100 100 mV
Input Impedance for HS
Internal specification for input capacitance C
HSLOAD
11 pF
Internal C
HSLOAD
DP/DM matching C
HSLOADM
0.2 pF
External Components With the Total Budget Combined (without USB cable load)
External capacitance on DP or DM 2 pF
External series resistance on DP or DM 1 Ω
7.1.4.2 HS Differential Transmitter
The HS transmitter is always operated on the UTMI 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.
Table 7-6 lists the characteristics of the HS differential transmitter.
Table 7-6. HS Differential Transmitter
Parameter Comments Min Typ Max Unit
Output Levels for HS
HS TX idle level V
HSOI
Absolute voltage DP/DM – internal/external 45 Ω –10 0 10 mV
HS TX data signaling high V
HSOH
Absolute voltage DP/DM – internal/external 45 Ω 360 400 440 mV
HS data signaling low V
HSOL
–10 0 10 mV
Chirp J level V
CHIRPJ
Differential voltage 700 800 1100 mV
Chirp K level V
CHIRPK
Differential voltage –900 –800 –500 mV
HS TX disconnect threshold V
DISCOUT
Absolute voltage DP/DM – no external 45 Ω 700 mV
Driver Characteristics
Rise time t
HSR
(10%–90%) 500 ps
Fall time t
HSF
(10%–90%) 500 ps
Driver output resistance Z
HSDRV
Also serves as HS termination 40.5 45 49.5 Ω
74 USB Transceiver Copyright © 2008–2011, Texas Instruments Incorporated
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