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5-26 Lucent Technologies Inc.
USS-720
Instant USB
Preliminary Data Sheet, Rev. 5
USB-to-
IEEE
1284 Bridge September 1999
13
Electrical Characteristics
Table 31. dc Characteristics (TA = 0 °C to 70 °C, VDD = 3.3 V ± 0.3 V, VSS = 0 V.)
Table 32. USB Transceiver Driver Characteristics
* 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.
Parameter Symbol Test Conditions Min Typ Max Unit
Input Voltage:
Low
High
VIL
VIH
—
—
—
2.0
—
—
0.8
—
V
V
Output Voltage:
Low
High
VOL
VOH
—
—
—
2.4
—
—
0.4
—
V
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
3 V environment
4.375
3
5
3.3
5.5
3.6
V
V
Power Supply Current IDD — 0.5 70 98 mA
Parameter Symbol Test Conditions Min Max Unit
Rise and Fall Times:
(10%—90%)
(90%—10%)
tR
tF
OEN = 0, CL = 50 pF
4
4
20
20
ns
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
Table 33. Capacitance Values
Parameter Value Unit
CLK_LO 1.0 pF
CLK_HI 1.0 pF
All Other Pins 3.0 pF