Rainbow-electronics MAX9258 Manual do Utilizador descarregar pdf (Página 5)

MAX9257/MAX9258

_______________________________________________________________________________________ 5

Fully Programmable Serializer/Deserializer

with UART/I

C Control Channel

MAX9257 AC ELECTRICAL CHARACTERISTICS

CC_

= +3.0V to +3.6V, R

= 50Ω ±1%, T

= -40°C to +105°C, unless otherwise noted. Typical values are at V

CC_

= +3.3V,

= +25°C.) (Notes 5, 9)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

PCLK_IN TIMING REQUIREMENTS

Clock Period t

14.28 200.00 ns

Clock Frequency f

CLK

1/t

5 70 MHz

Clock Duty Cycle DC t

HIGH

or t

LOW

35 50 65 %

Clock Transition Time t

, t

(Figure 7) 4 ns

SWITCHING CHARACTERISTICS

LVDS Output Rise Time t

20% to 80% (Figure 4) 315 370 ps

LVDS Output Fall Time t

20% to 80% (Figure 4) 315 370 ps

R1A

F1A

642 970 1390

810 1140 1420

Control Transceiver Transition

Time

R1B

F1B

20% to 80% (Figure 16)

290 386 490

Input Setup Time t

(Figure 5) 0 ns

Input Hold Time t

(Figure 5) 3 ns

PSD1

Spread off (Figure 6)

(4.55 x t

)

Parallel-to-Serial Delay

PSD2

±4% spread

( 36.55 x t

)

PLL Lock Time t

LOCK

Combined FPLL and SPLL; PCLK_IN stable

32,768 x

Random Jitter t

420MHz LVDS output, spread off,

FPLL = bypassed

(RMS)

Deterministic Jitter t

- 1 PRBS, SRATE = 840Mbps, 18 bits,

no spread

142 ps (p-p)

SCL/TX, SDA/RX

PULLUP

= 10k

400

Rise Time t

0.3 x V

to 0.7 x

, C

= 30pF

PULLUP

= 1.6k

Fall Time t

0.7 x V

to 0.3 x V

CC,

= 30pF 40 ns

95kbps to 400kbps 100

400kbps to 1000kbps 50

1000kbps to 4250kbps 10

Pulse Width of Spike Suppressed

in SDA

SPK

DC to 10Mbps (bypass mode) 10

400kbps 100

Data Setup Time t

SETUP

4.25Mbps, C

= 10pF 60

400kbps 100

Data Hold Time t

HOLD

4.25Mbps, C

= 10pF 0

C TIMING (Note 8)

Maximum SCL Clock Frequency f

SCL

4.25 MHz

Minimum SCL Clock Frequency f

SCL

95 kHz

Start Condition Hold Time t

HD:STA

(Figure 30) 0.6 µs

1 2 3 4 5 6 7 8 9 10 ... 53 54

MAX9257/MAX9258 1
C Control Channel 1

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