UPSD325X datasheet(101/176 Pages) STMICROELECTRONICS

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µPSD325X DEVICES

Table 81. Transceiver DC Characteristics

Note: 1. VDD=5V ± 10%; VSS=0V; TA=0 to 70

2. Level guaranteed for range of VDD = 4.5V to 5.5V

3. With RPU, external idle resistor, 7.5

κ±2%, D- to VDD.

4. CL of 50pF(75ns) to 350pF (300ns).

5. Measured at crossover point of differential data signals.

6. USB specification indicates 330ns

Table 82. Transceiver AC Characteristics

Note: 1. VDD=5V ± 10%; VSS=0V; TA=0 to 70

Symb

Parameter

Test Conditions

Min

Max

Unit

VOH

Static Output High

15k

Ω±5%

2.8

3.6

VOL

Static Output Low

Notes 2,3

—

0.3

VDI

Differential Input Sensitivity

|(D+) - (D-)|, Fig 6.9

0.2

—

VCM

Differential Input Common Mode

Fig 6.9

0.8

2.5

VSE

Single Ended Receiver Threshold

—

0.8

2.0

CIN

Transceiver Capacitance

—

IIO

Data Line (D+, D-) Leakage

0V<(D+,D-)<3. 3,

–10

µA

RPU

External Bus Pull-up Resistance, D-

7.5k

Ω±2%

7.35

7.65

Ω

RPD

External Bus Pull-down Resistance

15k

Ω±5%

14.25

15.75

Ω

Parameter

Symb

Min

Max

Unit

Test Conditions

Low Speed Data Rate

fDRATE

1.4775

1.5225

Mbit/s

Ave. bit rate

Receiver Data Jitter Tolerance

tDJR1

–75

to next transition,

Differential Input Sensitivity

tDJR2

–45

for paired transition,

Differential to EOP Transition Skew

tDEOP

–40

100

Fig 6.10 4

EOP Width at Receiver

tEOPR1

165

—

rejects as EOP 4, 5

EOP Width at Receiver

tEOPR2

675

—

accepts as EOP 4

Source EOP Width

tEOPT

–1.25

1.50

µs

—

Differential Driver Jitter

tUDJ1

–95

to next transition,

Differential Driver Jitter

tUDJ2

–150

150

to paired transition,

USB Data Transition Rise Time

300

Notes 1, 2, 3

USB Data Transition Fall Time

300

Notes 1, 2, 3

Rise/Fall Time Matching

tRFM

120

tR / tF

Output Signal Crossover Volt age

VCRS

1.3

2.0

—

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