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LTC4314 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4314 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LTC4314 6 4314f PIN FUNCTIONS ACC: Three-State Acceleration and Buffer Mode Selec- tor. This pin controls the turn on voltage of the rise time accelerators 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 is low, stuck busses are neither disconnected nor clocked but FAULT is pulled low. Connect to GND if unused. ENABLE1-ENABLE4: 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 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 (QFN Package Only): Exposed pad may be left open or connected to device GND. 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-SCLOUT4: Downstream Serial Bus Clock Input/ Output Channels 1-4. Connect pins SCLOUT1-SCLOUT4 to the SCL lines on the downstream channels 1-4, 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-SDAOUT4: Downstream Serial Bus Data Input/ Output Channels 1-4. Connect pins SDAOUT1-SDAOUT4 to the SDA lines on downstream channels 1-4, 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. |
Similar Part No. - LTC4314_15 |
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Similar Description - LTC4314_15 |
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