LTC4303 datasheet(6/20 Pages) LINER

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LTC4312

4312f

PIN FUNCTIONS

ACC: Three-State Acceleration and Buffer Mode Selector.

This pin controls the turn on voltage of the rise time ac-

celerators and their current strength on both the input and

output sides. It also controls the turn-off voltage of the

buffers. See Table 1 in the Applications Information section.

DISCEN: Disconnect Stuck Bus Enable Input. When this

pin is high, stuck busses are automatically disconnected

and FAULT is pulled low after a timeout period of 45ms.

Up to sixteen clock pulses are subsequently applied to the

stuck output channels. When DISCEN pin is low, stuck

busses are neither disconnected nor clocked but FAULT

is pulled low. Connect to GND if unused.

ENABLE1-ENABLE2: Connection Enable Inputs. These

input pins enable or disable the corresponding output

channel. Driving an ENABLE pin low isolates SDAIN and

SCLIN from the corresponding SDAOUT and SCLOUT.

Only enable and disable a channel when all busses are

idle. During a bus stuck low fault condition, a falling edge

on all ENABLE pins followed by a rising edge on one or

more ENABLE pins forces a connection from SDAIN to

the selected SDAOUT and SCLIN to the selected SCLOUT.

Connect to GND if unused.

Exposed Pad (DFN Package Only): Exposed pad may be

left open or connected to device ground.

FAULT: Stuck Bus Fault Output. This open drain N-channel

MOSFET output pulls low if a simultaneous high on the

enabled SCLOUT and SDAOUT channels does not occur in

45ms. In normal operation FAULT is high. Connect a pull

up resistor, typically 10k, from this pin to the bus pull-up

supply. Leave open or tie to GND if unused.

GND: Device Ground.

SCLIN: Upstream Serial Bus Clock Input/Output. Connect

this pin to the SCL line on the upstream bus. Connect an

external pull-up resistor or current source between this

pin and the bus supply. Do not leave open.

SCLOUT1-SCLOUT2: Downstream Serial Bus Clock Input/

Output Channels 1-2. Connect pins SCLOUT1-SCLOUT2

to the SCL lines on the downstream channels 1-2, respec-

tively. When in use, an external pull-up resistor or current

source is required between the pin and the corresponding

bus supply. Leave open or tie to GND and connect the

corresponding ENABLE pin to GND, if unused.

SDAIN: Upstream Serial Bus Data Input/Output. Connect

this pin to the SDA line on the upstream bus. Connect an

external pull-up resistor or current source between this

pin and the bus supply. Do not leave open.

SDAOUT1-SDAOUT2: Downstream Serial Bus Data Input/

Output Channels 1-2. Connect pins SDAOUT1-SDAOUT2 to

the SDA lines on downstream channels 1-2, respectively.

When in use, an external pull-up resistor or current source

is required between the pin and the corresponding bus

supply. Leave open or tie to GND and connect the cor-

responding ENABLE pin to GND, if unused.

VCC: Power Supply Voltage. Power this pin from a sup-

ply between 2.9V and 5.5V. Bypass with at least 0.01μF

to GND.

VCC2: Output Side Rise Time Accelerator (RTA) Power

Supply Voltage. When powering VCC2, use a supply volt-

age ranging from 2.25V to 5.5V and bypass with at least

0.01μF to GND. If the downstream busses are powered

from multiple supply voltages, power VCC2 from the low-

est supply voltage. Output side RTAs are active if VCC2 ≥

2.25V and ACC is low or open. Grounding VCC2 disables

output side RTAs.

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