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LTC4313-3 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4313-3 Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page LTC4315 6 4315f PIN FUNCTIONS ACC (Pin 5): Three-State Acceleration Strength Selector. This pin controls the current strength of the rise time accelerators on both the input and output sides. Rise time accelerators (RTAs) are disabled if ACC is high, in current source mode if ACC is open and in the slew limited switch mode if ACC is low. See Table 1 in the Applications Information section. Grounding VCC2 selec- tively disables the output side RTAs independent of the ACC setting. DISCEN (Pin 2): Enable Input to Disconnect Stuck Bus. When this pin is high, stuck busses are automatically disconnected after a timeout period of 45ms and FAULT is pulled low. Up to sixteen clock pulses are subsequently applied to SCLOUT. When DISCEN is low, stuck busses are neither disconnected nor clocked but FAULT is pulled low. Connect to GND if unused. ENABLE (Pin 1): Connection Enable Input. When driven low, the ENABLE pin isolates SDAIN and SCLIN from SDAOUT and SCLOUT, asserts READY low, disables rise time accelerators and inhibits automatic clock and stop bit generation during a bus stuck low fault condition. When driven high, the ENABLE pin connects SDAIN and SCLIN to SDAOUT and SCLOUT after a stop bit or bus idle has been detected on both busses. Driving ENABLE high also enables automatic clock generation during a fault condition, if DISCEN is tied high. During a fault condition, a rising edge on the ENABLE pin forces a connection between SDAIN and SDAOUT and SCLIN and SCLOUT. When using the LTC4315 in a Hot Swap™ application with staggered pins, connect a 10k resistor between ENABLE and GND to ensure correct functionality. Connect to VCC if unused. Exposed Pad (DE12 Package Only): Exposed pad may be left open or connected to device GND. FAULT (Pin 8): Stuck Bus Fault Output. This open drain N-channel MOSFET output pulls low if a simultaneous high on SCLOUT and SDAOUT does not occur in 45ms. In normal operation FAULT is high. Connect a pull-up resis- tor, typically 10k, from this pin to the bus pull-up supply. Leave open or tie to GND if unused. GND (Pin 6): Device Ground. READY (Pin 7): Connection Ready Status Output. This open drain N-channel MOSFET output pulls low when the input and output sides are disconnected. READY is pulled high when ENABLE is high and a connection has been established between the input and output. Connect a pull-up resistor, typically 10k, from this pin to the bus pull-up supply. Leave open or tie to GND if unused. SCLIN (Pin 4): Serial Bus 1 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. The bus supply must be ≥ VCC if rise time accelerators are enabled. Do not leave open. SCLOUT (Pin 3): Serial Bus 2 Clock Input/Output. Con- nect this pin to the SCL bus segment where stuck low recovery is desired. Connect an external pull-up resistor or current source between this pin and the bus supply. The bus supply must be ≥ VCC2 if rise time accelerators are enabled. Do not leave open. SDAIN (Pin 9): Serial Bus 1 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. The bus supply must be ≥ VCCifrisetime accelerators are enabled. Do not leave open. SDAOUT (Pin 10): Serial Bus 2 Data Input/Output. Con- nect this pin to the SDA bus segment where stuck low recovery is desired. Connect an external pull-up resistor or current source between this pin and the bus supply. The bus supply must be ≥ VCC2 if rise time accelerators are enabled. Do not leave open. VCC (Pin 12): Power Supply Voltage. Power this pin from a supply between 2.9V and 5.5V. Bypass with at least 0.01μF to GND. VCC2 (Pin 11): SDAOUT, SCLOUT Rise Time Accelerator Power Supply Voltage. When powering VCC2, use a supply voltage ranging from 2.25V to 5.5V and bypass with at least 0.01μF to GND. Output side rise time accelerators are active if VCC2 ≥ 2.25V and ACC is low or open. Grounding VCC2 disables output side rise time accelerators indepen- dent of the state of ACC. |
Similar Part No. - LTC4313-3 |
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Similar Description - LTC4313-3 |
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