LTC4311 datasheet(10/20 Pages) LINER

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LTC4313-1/LTC4313-2/

LTC4313-3

4313123f

applicaTions inForMaTion

Falling Edge Characteristics

The LTC4313 introduces a propagation delay on falling

edges due to the finite response time and the finite current

sink capability of the buffers. In addition the LTC4313 also

slew limits the falling edge to an edge rate of 45V/µs (typ).

The slew limited falling edge eliminates fast transitions

on the busses and minimizes transmission line effects in

systems. Refer to the Typical Performance Characteristics

section for the propagation delay and fall times as a func-

tion of the bus capacitance.

Stuck Bus Disconnect and Recovery

During an output bus stuck low condition (SCLOUT and

SDAOUT have not been simultaneously high at least once

in 45ms), the LTC4313 attempts to unstick the bus by first

breakingtheconnectionbetweentheinputandoutput.After

40µs the LTC4313 generates up to sixteen 5.5KHz clock

pulses on the SCLOUT pin. Should the stuck bus release

high during this period, clock generation is stopped and

a stop bit is generated. This process is shown in Figure 4

for the case where SDAOUT starts out stuck low and

then recovers. As seen from Figure 4, the LTC4313 pulls

READY low and breaks the connection between the input

and output sides, when a stuck low condition on SDA is

detected. Clock pulses are then issued on SCLOUT to at-

tempttounsticktheSDAOUTbus.WhenSDAOUTrecovers,

clock pulsing is stopped, a stop bit is generated on the

output and READY is released high. When powering up

into a stuck low condition, a connection is never made

between the input and the output, as a stop bit or bus

idle condition is never detected. After a timeout period of

45ms, the behavior is the same as described previously.

Figure 4. Bus Waveforms During SDAOUT

Stuck Low and Recovery Event

4313123 F04

SCLOUT

5V/DIV

READY

5V/DIV

SDAIN

5V/DIV

SDAOUT

5V/DIV

1ms/DIV

DISCONNECT

AT TIMEOUT

STUCK LOW > 45ms

AUTOMATIC CLOCKING

RECOVERS HIGH

DRIVEN LOW

STOP BIT GENERATED

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