
S3C2440A RISC MICROPROCESSOR ELECTRICAL DATA
27-41
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 Ω
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
Rising time TR CL = 50pF
CL = 350pF
75 ns
300
Falling time TF CL = 50pF
CL = 350pF
75
300
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.
Comments to this Manuals