Datasheet

USB_V
SSREF
USB_R1
USB
10K ±1%Ω
(A)
A.Placethe10K Ω ±1%asclosetothedeviceaspossible.
t
r
t
f
V
CRS
90% V
OH
10% V
OL
USB_DN
USB_DP
t
per −
t
jr
TMS320DM6467T
SPRS605C –JULY 2009–REVISED JUNE 2012 www.ti.com
7.19.4 USB2.0 Electrical Data/Timing
Table 7-87. Switching Characteristics Over Recommended Operating Conditions for USB2.0 (see
Figure 7-62)
-1G
LOW SPEED FULL SPEED HIGH SPEED
NO. PARAMETER UNIT
1.5 Mbps 12 Mbps 480 Mbps
MIN MAX MIN MAX MIN MAX
1 t
r(D)
Rise time, USB_DP and USB_DN signals
(1)
75 300 4 20 0.5 ns
2 t
f(D)
Fall time, USB_DP and USB_DN signals
(1)
75 300 4 20 0.5 ns
3 t
rfM
Rise/Fall time, matching
(2)
80 125 90 111.11 – – %
4 V
CRS
Output signal cross-over voltage
(1)
1.3 2 1.3 2 – – V
5 t
jr(source)NT
Source (Host) Driver jitter, next transition 2 2
(3)
ns
t
jr(FUNC)NT
Function Driver jitter, next transition 25 2
(3)
ns
6 t
jr(source)PT
Source (Host) Driver jitter, paired transition
(4)
1 1
(3)
ns
t
jr(FUNC)PT
Function Driver jitter, paired transition 10 1
(3)
ns
7 t
w(EOPT)
Pulse duration, EOP transmitter 1250 1500 160 175 – – ns
8 t
w(EOPR)
Pulse duration, EOP receiver 670 82 – ns
9 t
(DRATE)
Data Rate 1.5 12 480 Mb/s
10 Z
DRV
Driver Output Resistance – – 28 49.5 40.5 49.5 Ω
11 USB_R1 USB reference resistor 9.9 10.1 9.9 10.1 9.9 10.1 kΩ
(1) Low Speed: C
L
= 200 pF, Full Speed: C
L
= 50 pF, High Speed: C
L
= 50 pF
(2) t
RFM
= (t
r
/t
f
) x 100. [Excluding the first transaction from the Idle state.]
(3) For more detailed information, see the Universal Serial Bus Specification Revision 2.0, Chapter 7. Electrical.
(4) t
jr
= t
px(1)
- t
px(0)
Figure 7-62. USB2.0 Integrated Transceiver Interface Timing
Figure 7-63. USB Reference Resistor Routing
278 Peripheral Information and Electrical Specifications Copyright © 2009–2012, Texas Instruments Incorporated
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