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USS810 Datasheet PDF : 14 Pages
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USS810 USB 2.0
Full-Speed/Low-Speed Transceiver
Data Sheet, Rev. 6
March 2006
9 Dynamic Characteristics
Table 10. Dynamic Characteristics: Analog I/O Pins (D+, D–)1
VDD = 3.3 V; VDD(I/O) = 1.75 V to 3.3 V; VGND = 0 V; Tamb = –40 °C to +85 °C; unless otherwise specified.
Symbol
Parameter
Conditions
Min Typical Max
Driver Characteristics
Full-Speed Mode (Speed = 1)
tR Rise Time
OE = 0, CL = 50 pF;
4
—
20
10% to 90% of |VOL − VOH|;
see Figure 3..
tF Fall Time
OE = 0, CL = 50 pF;
4
—
20
90% to 10% of |VOH − VOL|;
see Figure 3.
DRFM Differential Rise/Fall Time Matching OE = 0, CL = 50 pF.
90
100 110
VCRS Output Signal Crossover Voltage OE = 0, CL = 50 pF:
1.3
—
2.0
see Figures 4, 5, 6.
Low-Speed Mode (Speed = 0)
tR Rise Time
OE = 0, CL = 50 pF or
75
—
300
350 pF; 10% to 90% of
|VOL − VOH|; see Figure 3.
tF
Fall Time
OE = 0, CL = 50 pF or
75
—
300
350 pF; 90% to 10% of
|VOH − VOL|; see Figure 3.
DRFM Differential Rise/Fall Time Matching CL = 50 pF or 350 pF.
80
100 120
VCRS Output Signal Crossover Voltage CL = 50 pF or 350 pF;
1.3
—
2.0
see Figures 4, 5, 6.
Driver Timing
Full-Speed Mode (Speed = 1)
tPLH Driver Propagation Delay:
OE = 0, CL = 50 pF; see
—
—
18
Low-to-High (VO, FSE0 to D+, D–) Figure 6.
tPHL Driver Propagation Delay:
OE = 0, CL = 50 pF; see
High-to-Low (VO, FSE0 to D+, D–) Figure 6.
—
—
18
tPHZ Tristate Output Disable: High-to-Off OE switching; see Figure 4. —
—
2.5
(OE to D+, D−)
tPLZ Tristate Output Disable: Low-to-Off OE switching; see Figure 4. —
—
2.5
(OE to D+, D−)
tPZH Tristate Output Enable: Off-to-High OE switching; see Figure 4. —
—
20
(OE to D+, D−)
tPZL Tristate Output Enable: Off-to-Low OE switching; see Figure 4. —
—
20
(OE to D+, D−)
Unit
ns
ns
%
V
ns
ns
%
V
ns
ns
ns
ns
ns
ns
1. Test circuit: see Figure 7.
8
Agere Systems Inc.
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