Datasheet LTC4314 (Analog Devices) - 6
| Fabricante | Analog Devices |
| Descripción | Pin-Selectable, 4-Channel, 2-Wire Multiplexer with Bus Buffers |
| Páginas / Página | 20 / 6 — PIN FUNCTIONS. ACC:. SCLIN:. SCLOUT1-SCLOUT4:. DISCEN:. SDAIN:. … |
| Formato / tamaño de archivo | PDF / 207 Kb |
| Idioma del documento | Inglés |
PIN FUNCTIONS. ACC:. SCLIN:. SCLOUT1-SCLOUT4:. DISCEN:. SDAIN:. ENABLE1-ENABLE4:. SDAOUT1-SDAOUT4:. Exposed Pad (QFN Package Only):. CC:
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LTC4314
PIN FUNCTIONS ACC:
Three-State Acceleration and Buffer Mode Selec-
SCLIN:
Upstream Serial Bus Clock Input/Output. Connect tor. This pin controls the turn on voltage of the rise time this pin to the SCL line on the upstream bus. Connect an accelerators and their current strength on both the input external pull-up resistor or current source between this and output sides. It also controls the turn-off voltage of pin and the bus supply. Do not leave open. the buffers. See Table 1 in the Applications Information
SCLOUT1-SCLOUT4:
Downstream Serial Bus Clock Input/ section. Output Channels 1-4. Connect pins SCLOUT1-SCLOUT4
DISCEN:
Disconnect Stuck Bus Enable Input. When this to the SCL lines on the downstream channels 1-4, respec- pin is high, stuck busses are automatically disconnected tively. When in use, an external pull-up resistor or current and FAULT is pulled low after a timeout period of 45ms. source is required between the pin and the corresponding Up to sixteen clock pulses are subsequently applied to the bus supply. Leave open or tie to GND and connect the stuck output channels. When DISCEN is low, stuck busses corresponding ENABLE pin to GND if unused. are neither disconnected nor clocked but FAULT is pulled
SDAIN:
Upstream Serial Bus Data Input/Output. Connect low. Connect to GND if unused. this pin to the SDA line on the upstream bus. Connect an
ENABLE1-ENABLE4:
Connection Enable Inputs. These external pull-up resistor or current source between this input pins enable or disable the corresponding output pin and the bus supply. Do not leave open. channel. Driving an ENABLE pin low isolates SDAIN and
SDAOUT1-SDAOUT4:
Downstream Serial Bus Data Input/ SCLIN from the corresponding SDAOUT and SCLOUT. Output Channels 1-4. Connect pins SDAOUT1-SDAOUT4 to Only enable and disable a channel when all busses are the SDA lines on downstream channels 1-4, respectively. idle. During bus stuck low fault condition, a falling edge When in use, an external pull-up resistor or current source on all ENABLE pins followed by a rising edge on one or is required between the pin and the corresponding bus more ENABLE pins forces a connection from SDAIN to supply. Leave open or tie to GND and connect the cor- the selected SDAOUT and SCLIN to the selected SCLOUT. responding ENABLE pin to GND if unused. Connect to GND if unused.
V Exposed Pad (QFN Package Only):
Exposed pad may be
CC:
Power Supply Voltage. Power this pin from a sup- ply between 2.9V and 5.5V. Bypass with at least 0.01μF left open or connected to device GND. to GND.
FAULT:
Stuck Bus Fault Output. This open drain N-channel
V
MOSFET output pulls low if a simultaneous high on the
CC2:
Output Side Rise Time Accelerator (RTA) Power Supply Voltage. When powering V enabled SCLOUT and SDAOUT channels does not occur in CC2, use a supply volt- age ranging from 2.25V to 5.5V and bypass with at least 45ms. In normal operation FAULT is high. Connect a pull 0.01μF to GND. If the downstream busses are powered up resistor, typically 10k, from this pin to the bus pull-up from multiple supply voltages, power V supply. Leave open or tie to GND if unused. CC2 from the low- est supply voltage. Output side RTAs are active if VCC2 ≥
GND:
Device Ground. 2.25V and ACC is low or open. Grounding VCC2 disables output side RTAs. 4314f 6
PIN FUNCTIONS ACC:
Three-State Acceleration and Buffer Mode Selec-
SCLIN:
Upstream Serial Bus Clock Input/Output. Connect tor. This pin controls the turn on voltage of the rise time this pin to the SCL line on the upstream bus. Connect an accelerators and their current strength on both the input external pull-up resistor or current source between this and output sides. It also controls the turn-off voltage of pin and the bus supply. Do not leave open. the buffers. See Table 1 in the Applications Information
SCLOUT1-SCLOUT4:
Downstream Serial Bus Clock Input/ section. Output Channels 1-4. Connect pins SCLOUT1-SCLOUT4
DISCEN:
Disconnect Stuck Bus Enable Input. When this to the SCL lines on the downstream channels 1-4, respec- pin is high, stuck busses are automatically disconnected tively. When in use, an external pull-up resistor or current and FAULT is pulled low after a timeout period of 45ms. source is required between the pin and the corresponding Up to sixteen clock pulses are subsequently applied to the bus supply. Leave open or tie to GND and connect the stuck output channels. When DISCEN is low, stuck busses corresponding ENABLE pin to GND if unused. are neither disconnected nor clocked but FAULT is pulled
SDAIN:
Upstream Serial Bus Data Input/Output. Connect low. Connect to GND if unused. this pin to the SDA line on the upstream bus. Connect an
ENABLE1-ENABLE4:
Connection Enable Inputs. These external pull-up resistor or current source between this input pins enable or disable the corresponding output pin and the bus supply. Do not leave open. channel. Driving an ENABLE pin low isolates SDAIN and
SDAOUT1-SDAOUT4:
Downstream Serial Bus Data Input/ SCLIN from the corresponding SDAOUT and SCLOUT. Output Channels 1-4. Connect pins SDAOUT1-SDAOUT4 to Only enable and disable a channel when all busses are the SDA lines on downstream channels 1-4, respectively. idle. During bus stuck low fault condition, a falling edge When in use, an external pull-up resistor or current source on all ENABLE pins followed by a rising edge on one or is required between the pin and the corresponding bus more ENABLE pins forces a connection from SDAIN to supply. Leave open or tie to GND and connect the cor- the selected SDAOUT and SCLIN to the selected SCLOUT. responding ENABLE pin to GND if unused. Connect to GND if unused.
V Exposed Pad (QFN Package Only):
Exposed pad may be
CC:
Power Supply Voltage. Power this pin from a sup- ply between 2.9V and 5.5V. Bypass with at least 0.01μF left open or connected to device GND. to GND.
FAULT:
Stuck Bus Fault Output. This open drain N-channel
V
MOSFET output pulls low if a simultaneous high on the
CC2:
Output Side Rise Time Accelerator (RTA) Power Supply Voltage. When powering V enabled SCLOUT and SDAOUT channels does not occur in CC2, use a supply volt- age ranging from 2.25V to 5.5V and bypass with at least 45ms. In normal operation FAULT is high. Connect a pull 0.01μF to GND. If the downstream busses are powered up resistor, typically 10k, from this pin to the bus pull-up from multiple supply voltages, power V supply. Leave open or tie to GND if unused. CC2 from the low- est supply voltage. Output side RTAs are active if VCC2 ≥
GND:
Device Ground. 2.25V and ACC is low or open. Grounding VCC2 disables output side RTAs. 4314f 6