Rainbow-electronics MAX3301E Manual do Utilizador descarregar pdf (Página 6)

MAX3301E

USB On-the-Go Transceiver and Charge Pump

6 _______________________________________________________________________________________

C-/SMBus™- COMPATIBLE TIMING SPECIFICATIONS

= +3V to +4.5V, V

= +1.65V to +3.6V, C

FLYING

= 100nF, C

VBUS

= 1µF, ESR

CVBUS

= 0.1Ω (max), T

= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are at V

= +3.7V, V

= +2.5V, T

= +25°C.) (Note 2)

PARAMETER

SYM B O L

CONDITIONS

MIN TYP MAX UNITS

Serial Clock Frequency f

SCL

400 kHz

Bus-Free Time Between Stop and

Start Conditions

BUF

1.3 µs

Start-Condition Hold Time

HD_STA

0.6 µs

Stop-Condition Setup Time

SU_STO

0.6 µs

Clock Low Period t

LOW

1.3 µs

Clock High Period t

HIGH

0.6 µs

Data Setup Time

SU_DAT

100

Data Hold Time

HD_DAT

(Note 4) 0.9 µs

Rise Time of SDA and SCL t

(Note 5)

20 +

0.1 x

300 ns

Fall Time of SDA and SCL t

Measured from 0.3 x V

to 0.7 x V

(Note 5)

300 ns

Capacitive Load for each Bus

Line

400 pF

SDA AND SCL I/O STAGE CHARACTERISTICS

Input-Voltage Low V

0.3 x

Input-Voltage High V

0.7 x

SDA Output-Voltage Low V

SINK

= 3mA 0.4 V

Pulse Width of Suppressed Spike

(Note 6) 50 ns

Note 2: Parameters are 100% production tested at +25°C. Limits over temperature are guaranteed by design.

Note 3: Guaranteed by bench characterization. Limits are not production tested.

Note 4: A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL’s falling

edge.

Note 5: C

is the total capacitance of one bus line in pF, tested with C

= 400pF.

Note 6: Input filters on SDA, SCL, and ADD suppress noise spikes of less than 50ns.

SMBus™ is a trademark of Intel Corporation.

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