Lucent Technologies USS-720 manual Electrical Characteristics, Capacitance Values Parameter Unit

USS-720Instant USB	Preliminary Data Sheet, Rev. 5
USB-to-IEEE1284 Bridge	September 1999

Electrical Characteristics

Table 31. dc Characteristics (TA = 0 °C to 70 °C, VDD = 3.3 V ± 0.3 V, VSS = 0 V.)

Parameter	Symbol	Test Conditions			Min		Typ	Max	Unit
Input Voltage:
Low	VIL		—		—		—	0.8	V
High	VIH		—		2.0		—	—	V
Output Voltage:
Low	VOL		—		—		—	0.4	V
High	VOH		—		2.4		—	—	V
Power Dissipation	PD	25 °C, VDD = 3.3 V			1.65	231		323.4	mW
Power Supply Voltage	VDD, VDDA		—		3	3.3		3.6	V
	VDD5	5 V environment			4.375	5		5.5	V
		3 V environment			3	3.3		3.6	V
Power Supply Current	IDD		—		0.5	70		98	mA
Table 32. USB Transceiver Driver Characteristics
Parameter		Symbol		Test Conditions			Min	Max	Unit
Rise and Fall Times:				OEN = 0, CL = 50 pF
(10%—90%)		tR					4	20	ns
(90%—10%)		tF					4	20	ns
Rise/Fall Time Matching		tRFM		OEN = 0, CL = 50 pF			90	110	%
Crossover Point		VCRS		OEN = 0, CL = 50 pF			1.3	2.0	V
Output Impedance*		ZDRV		OEN = 0			28	43	Ω

* The output impedance includes both the external resistor and the transceiver.

The USS-720 is a 3.3 V part, and it has separate pins (VDD5) for power to the IEEE 1284 drivers. Capacitance val- ues for the USS-720 pins are listed in Table 33.

Table 33. Capacitance Values

Parameter	Value	Unit
CLK_LO	1.0	pF
CLK_HI	1.0	pF
All Other Pins	3.0	pF

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