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FSA9280A

USB Port Multimedia Switch Featuring Automatic Select and Accessory Detection

Fairchild Semiconductor 

9.4. Capacitance

Symbol

Parameter

VBAT

(V)

Condition

CONUSB DP_CON, DM_CON On Capacitance (USB Mode) 3.8 VBIAS=0.2V, f=1MHz

TA = -40 to +85°C

Min. Typ. Max.

8

Unit

pF

9.5. Switch Path AC Electrical Characteristics

All typical values are for VBAT=3.8V at TA=25ºC unless otherwise specified.

Symbol

Parameter

Condition

TA = -40 to +85°C

Unit

Min. Typ. Max.

Xtalk

Active Channel Crosstalk

DP_CON to DM_CON

Audio Mode

USB Mode

f=20kHz, RT=32Ω, CL=0pF

f=1MHz, RT=50Ω, CL=0pF

f=240MHz, RT=50Ω, CL=0pF

-50

-60

dB

-40

OIRR Off Isolation

Audio Mode

USB Mode

f=20kHz, RT=32Ω, CL=0pF

f=1 MHz, RT=50Ω, CL=0pF

-90

dB

-90

PSRR

Power Supply Rejection Ratio, MIC on VBUS_IN

Power Supply Noise 300mVpp,

f=217Hz

-100

dB

20Hz to 20kHz, RL=32/16Ω,

Input Signal Range 2VPP

0.03

THD Total Harmonic Distortion (Audio Path)

%

20Hz to 20kHz, RL=32/16Ω,

Input Signal Range -1.2V to 1.2V

0.05

tSK(P)

Skew of Opposite Transitions of the Same

Output (USB Mode)

tr=tf=750ps (10-90%) at 240MHz,

CL=0pF, RL=50Ω

30

ps

tI2CRST

Time When I2C_SDA and I2C_SCL Both LOW

to Cause a Reset

See Figure 6

30

ms

tINTMASK

Time after INT Mask Cleared to “0“ until INTB

Goes LOW to Signal the Interrupt after

Interruptible Event while INT Mask Bit Set to “1”

See Figure 18

10

ms

tSDPDET

Time from VBUS_IN Valid to VBUS_OUT Valid with

Charger FET Closed and USB Switches Closed

for USB Standard Downstream Port

See Figure 10

130

ms

tCHGOUT

Time from VBUS_IN Valid to VBUS_OUT Valid with the

Charger FET Closed for Both USB Charging

Ports (CDP and DCP)

See Figure 9

170

ms

tCARKIT

Time from VBUS_IN Valid to Car Kit Type 1 or

Type 2 Charger Detected

See Figure 11

200

ms

tCHGDET

Time from VBUS_OUT Valid to CHG_DET Output

LOW for Both USB Charging Ports (CDP and

DCP) and for Car Kit Chargers

See Figure 9, Figure 11

100

ms

tIDDET

Time from ID_CON Not Floating to INTB LOW to

Signal Accessory Attached that is ID_CON

Resistance-Based Only (VBUS_IN Not Valid)

See Figure 8

200

ms

tJIGVBUS

Time from VBUS_IN Valid to JIG LOW and

VBUS_OUT Valid with Charger FET Closed for Both

Factory Mode Operation with VBUS_IN Present

Time from VBUS_IN Valid to JIG LOW for Factory

Mode Operation without VBUS_IN Present

See Figure 25

See Figure 26

200

ms

200

ms

© 2009 Fairchild Semiconductor Corporation

FSA9280A • Rev 1.1.0

18

www.fairchildsemi.com

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