Datasheet

TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
Table 7-7. LS/FS Single-Ended Receivers (continued)
Parameter Comments Min Typ Max Unit
UART Receiver CEA
VIH_SER DP_PULLDOWN asserted 2 V
Serial interface input low VIL_SER DP_PULLDOWN asserted 0.8 V
Switching threshold V
TH
0.8 2 V
UART Receiver MCPC From DP.RXD
MCPC DP pullup RMCPCDP Internal pullup 4.7k 10k Ω
Open-drain input high level Z
IH
Internal MCPC DP pullup asserted Open Ω
External open-drain NMOS impedance to ground.
Open-drain input low level Z
IL
100 Ω
With internal MCPC DP pullup asserted.
Output high level V
OH
(*) At DATA1 pin VIO – 0.45 V
Output low level V
OL
At DATA1 pin 0.45 V
7.2.4.3 LS/FS Differential Receiver
A differential input receiver (RX) retrieves the LS/FS differential data signaling. The differential voltage on
the line is converted to digital data by a differential comparator on DP/DM. This data is then sent to a
clock and data recovery circuit that recovers the clock from the data. In an additional serial mode, the
differential data is directly output on the RXRCV pin. Table 7-8 lists the parameters of the LS/FS
differential receiver.
Table 7-8. LS/FS Differential Receiver
Parameter Comments Min Typ Max Unit
Skew between VP/VM SKWVP_VM Driver outputs unloaded –16 0 16 ns
Receiver power-up time TPWR_UP_RCV 0 100 200 μs
Differential common mode range V
CM
0.8 2.5 V
Differential input sensitivity V
DI
0.2 V
7.2.4.4 LS/FS Differential Transmitter
The USB transceiver (TX) uses a differential output driver to drive the USB data signal D+/– onto the USB
cable. The driver outputs support 3-state operation to achieve bidirectional half-duplex transactions.
Table 7-9 lists the parameters of the LS/FS differential transmitter.
Table 7-9. LS/FS Differential Transmitter
Parameter Comments Min Typ Max Unit
B-device (dual-role) unconfigured
IB_OTG_UNCFG 150 μA
average current
0 V = VBUS = 5.25 V, t
AVG
= 1 ms
B-device (secure remote password
[SRP] capable, peripheral only) IB_PO_UNCFG 8 mA
unconfigured average current
10%–90%
FS fall time/rise time t
Ff
, t
Fr
4 20 ns
C
L
= 50 pF on DP and DM
10%–90%
FS rise and fall time matching TFRFM 90% 110%
C
L
= 50 pF on DP and DM
FS width of SE0 interval during Pulldowns R = 15 kΩ on DP and DM
t
Fst
14 ns
differential transition Pullup R = 1.5 kΩ at 3.6 V on DP only
10%–90%
LS fall time/rise time t
LF
, t
LR
C
L
= [200–600] pF on DP and DM 75 300 ns
Pullup R = 1.5 kΩ at 3.6 V for DM only
10%–90%
LS rise and fall time matching TLRFM C
L
= [200–600] pF on DP and DM 80% 120%
Pullup R = 1.5 kΩ at 3.6 V for DM only
Copyright © 2008–2011, Texas Instruments Incorporated USB HS 2.0 OTG Transceiver 107
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