Datasheet

TUSB1210
SLLSE09F –NOVEMBER 2009–REVISED AUGUST 2012 www.ti.com
Built-in pullup and pulldown resistors are used as part of the protocol signaling.
Apart from this, the PHY also contains circuitry which protects it from accidental 5-V short on the DP and
DM lines.
6.3.3.1 LS/FS Single-Ended Receivers
In addition to the differential receiver, there is a single-ended receiver (SE–, SE+) for each of the two data
lines D+/–. The main purpose of the single-ended receivers is to qualify the D+ and D– signals in the full-
speed/low-speed modes of operation.
Table 6-7. LS/FS Single-Ended Receivers
PARAMETER COMMENTS MIN TYP MAX UNIT
USB single-ended receivers
SK
WVP_VM
Skew between VP and VM Driver outputs unloaded –2 0 2 ns
V
SE_HYS
Single-ended hysteresis 50 mV
V
IH
High (driven) 2 V
V
IL
Low 0.8 V
V
TH
Switching threshold 0.8 2 V
6.3.3.2 LS/FS Differential Receiver
A differential input receiver (Rx) retrieves the LS/FS differential data signaling. The differential voltage on
the line is converted into digital data by a differential comparator on DP/DM. This data is then sent to a
clock and data recovery circuit which recovers the clock from the data. An additional serial mode exists in
which the differential data is directly output on the RXRCV pin.
Table 6-8. LS/FS Differential Receiver
PARAMETER COMMENTS MIN TYP MAX UNIT
V
DI
Differential input sensitivity Ref. USB2.0 200 mV
V
CM
Differential Common mode range Ref. USB2.0 0.8 2.5 V
6.3.3.3 LS/FS Transmitter
The USB transceiver (Tx) uses a differential output driver to drive the USB data signal D+/– onto the USB
cable. The driver's outputs support 3-state operation to achieve bidirectional half-duplex transactions.
Table 6-9. LS 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
V
CRS
Output signal crossover voltage Ref. USB2.0, covered by 1.3 2 V
eye diagram
T
FR
Rise time Ref. USB2.0, covered by 75 300 ns
eye diagram
T
FF
Fall time 75 300 ns
T
FRFM
Differential rise and fall time matching 80 125 %
T
FDRATE
Low-speed data rate Ref. USB2.0, covered by 1.4775 1.5225 Mb/s
eye diagram
T
DJ1
Source jitter total (including To next transition Ref. USB2.0, covered by -25 25 ns
frequency tolerance) eye diagram
T
DJ2
For paired transitions -10 10
T
FEOPT
Source SE0 interval of EOP Ref. USB2.0, covered by 1.25 1.5 us
eye diagram
20 USB Connectivity Copyright © 2009–2012, Texas Instruments Incorporated
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