SMSC USB3280 Driver Characteristics of

Hi-Speed USB Device PHY with UTMI Interface

Datasheet

Table 6.5 Dynamic Characteristics: Digital UTMI Pins (Note 6.5)

PARAMETER		SYMBOL	CONDITIONS	MIN	TYP	MAX	UNITS
UTMI Timing
DATA[7:0]		TPD	Output Delay. Measured	2		5	ns
			from PHY output to the
RXVALID			rising edge of CLKOUT
RXACTIVE
RXERROR
LINESTATE[1:0]
TXREADY
DATA[7:0]		TSU	Setup Time. Measured	5			ns
			from PHY input to the
TXVALID			rising edge of CLKOUT.
OPMODE[1:0]
XCVRSELECT
TERMSELECT
DATA[7:0]		TH	Hold time. Measured from	0			ns
			the rising egde of
TXVALID			CLKOUT to the PHY input
			signal edge.
OPMODE[1:0]
XCVRSELECT
TERMSELECT
Note 6.5	VDD3.3 = 3.0 to 3.6V; VSS = 0V; TA = -40oC to 85oC; unless otherwise specified.

6.1Driver Characteristics of Full-Speed Drivers in High-Speed Capable Transceivers

The USB3280 uses a differential output driver to drive the USB data signal onto the USB cable. Figure 6.1 Full-Speed Driver VOH/IOH Characteristics for High-speed Capable Transceiveron page 17 shows the V/I characteristics for a full-speed driver which is part of a high-speed capable transceiver. The normalized V/I curve for the driver must fall entirely inside the shaded region. The V/I region is bounded by the minimum driver impedance above (40.5 Ohm) and the maximum driver impedance below (49.5 Ohm). The output voltage must be within 10mV of ground when no current is flowing in or out of the pin.

Revision 1.5 (11-15-07)	16	SMSC USB3280
	DATASHEET