Lucent Technologies USS-720 - Manual (Page 52)

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 (T A = 0
°
C to 70
°
C, V DD = 3.3 V
±
0.3 V, V SS = 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 (V DD 5) 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 V IL
V
IH
—
— —
2.0
—
— 0.8
—
V
V
Output Voltage:
Low
High V OL
V OH
—
— —
2.4
—
— 0.4
—
V
V
Power Dissipation P D 25
°
C, V DD = 3.3 V 1.65 231 323.4 mW
Power Supply Voltage V DD, V DDA — 3 3.3 3.6 V
V DD5 5 V environment
3 V environment 4.375
3
5
3.3
5.5
3.6 V
V
Power Supply Current I DD — 0.5 70 98 mA
Parameter Symbol Test Conditions Min Max Unit
Rise and Fall Times:
(10%—90%)
(90%—10%) t R
t F
OEN = 0, C L = 50 pF
4
4 20
20 ns
ns
Rise/Fall Time Matching t RFM OEN = 0, C L = 50 pF 90 110 %
Crossover Point V CRS OEN = 0, C L = 50 pF 1.3 2.0 V
Output Impedance* Z DRV 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