DM385 datasheet(272/281 Pages) TI

272 / 281 page

VCRS

90% VOH

10% VOL

USBx_DM

USBx_DP

tper − tjr

DM385, DM388

SPRS821D – MARCH 2013 – REVISED DECEMBER 2013

www.ti.com

8.20.2 USB2.0 Electrical Data/Timing

Table 8-85. Switching Characteristics Over Recommended Operating Conditions for USB2.0

(see Figure 8-95)

OPP100/OPP120/

Turbo/Nitro

NO.

PARAMETER

LOW SPEED

FULL SPEED

HIGH SPEED

UNIT

1.5 Mbps

12 Mbps

480 Mbps

MIN

MAX

MIN

MAX

MIN

MAX

tr(D)

Rise time, USBx_DP and USBx_DM signals(1)

300

0.5

tf(D)

Fall time, USBx_DP and USBx_DM signals (1)

300

0.5

trfM

Rise/Fall time, matching(2)

125

111

–

VCRS

Output signal cross-over voltage(1)

1.3

–

tjr(source)NT

Source (Host) Driver jitter, next transition

(3)

tjr(FUNC)NT

Function Driver jitter, next transition

(3)

tjr(source)PT

Source (Host) Driver jitter, paired transition(4)

(3)

tjr(FUNC)PT

Function Driver jitter, paired transition

(3)

tw(EOPT)

Pulse duration, EOP transmitter

1250

1500

160

175

–

tw(EOPR)

Pulse duration, EOP receiver(5)

670

–

t(DRATE)

Data Rate

1.5

480 Mb/s

ZDRV

Driver Output Resistance

–

49.5

40.5

49.5

Ω

ZINP

Receiver Input Impedance

300

–

Ω

(1)

Low Speed: CL = 200 pF, Full Speed: CL = 50 pF, High Speed: CL = 50 pF

(2)

tRFM = (tr/tf) 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)

tjr = tpx(1) - tpx(0)

(5)

Must accept as valid EOP.

Figure 8-95. USB2.0 Integrated Transceiver Interface Timing

For more detailed information on USB2.0 board design, routing, and layout guidelines, see the USB 2.0

Board Design and Layout Guidelines Application Report (Literature Number: SPRAAR7).

272

Peripheral Information and Timings

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