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ELECTRICAL DATA S3C2440A RISC MICROPROCESSOR
27-42
Table 27-18 USB Full Speed Output Buffer Electrical Characteristics
(V
DD
= 1.2 V ± 0.05 V, T
A
= -40 to 85 °C, V
EXT
= 3.3V ± 0.3V)
Parameter Symbol Condition Min Max Unit
Driver Characteristics
Transition Time
Rise Time
Fall Time
TR
TF
CL = 50pF
CL = 50pF
4.0
4.0
20
20
ns
Rise/Fall Time Matching Trfm (TR / TF ) 90 111.1 %
Output Signal Crossover Voltage Vcrs 1.3 2.0 V
Drive Output Resistance Zdrv Steady state drive 28 44 ohm
Table 27-19 USB Low Speed Output Buffer Electrical Characteristics
(V
DD
= 1.2 V ± 0.05 V, T
A
= -40 to 85 °C, V
EXT
= 3.3V ± 0.3V)
Parameter Symbol Condition Min Max Unit
Driver Characteristics
75
Rising Time TR
CL = 50pF
CL = 350pF
300
75
Falling Time TF
CL = 50pF
CL = 350pF
300
ns
Rise/Fall Time Matching Trfm (Tr / Tf ) 80 125 %
Output Signal Crossover Voltage Vcrs 1.3 2.0 V
Note: All measurement conditions are in accordance with the Universal Serial Bus Specification 1.1 Final Draft Revision.