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RV5C387A Datasheet(PDF) 3 Page - RICOH electronics devices division |
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RV5C387A Datasheet(HTML) 3 Page - RICOH electronics devices division |
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3 / 42 page  PRELIMINARY RV5C387A 12345 - 3 - 5. PIN DESCRIPTION Symbol Item Description SCL Serial Clock Line The SCL pin is used to input clock pulses synchronizing the input and output of data to and from the SDA pin. Allows a maximum input voltage of 5.5 volts regardless of supply voltage. SDA Serial Data Line The SDA pin is used to input or output data intended for writing or reading in synchronization with the SCL pin. Up to 5.5v beyond VDD may be input. This pin functions as an Nch open drain output. /INTRA Interrupt Output A The /INTRA pin is used to output periodic interrupt signals to the CPU. Disabled at power-on from 0 volts. Nch. open drain output. /INTRB Interrupt Output B The /INTRB pin is used to output alarm interrupt (Alarrm_W) signals to the CPU. Disabled at power-on from 0 volts. Nch. open drain output. /INTRC Interrupt Output C The /INTRC pin is used to output alarm interrupt (Alarm_D) signals to the CPU. Disabled at power-on from 0 volts. Nch. open drain output. 32KOUT 32kHz Clock Output The 32KOUT pin is used to output 32.768-kHz clock pulses. Enabled at power-on from 0 volts. Nch. open drain output. The RV5C387A is designed to disable 32-kHz clock output in response to a command from the host computer. OSCIN OSCOUT Oscillation Circuit Input / Output The OSCIN and OSCOUT pins are used to connect the 32.768-kHz crystal oscillator (with all other oscillation circuit components built into the RV5C387A). VDD VSS Positive Power Supply Input Negative Power Supply Input The VDD pin is connected to the power supply. The VSS pin is grounded. 6. ABSOLUTE MAXIMUM RATINGS (VSS=0V) Symbol Item Pin Name Description Unit VDD Supply Voltage -0.3 to +6.5 V VI Input Voltage SCL, SDA -0.3 to +6.5 V VO Output Voltage 32KOUT, SDA, /INTRA, /INTRB, /INTRC -0.3 to +6.5 V PD Power Dissipation Topt = 25 °C 300 mW Topt Operating Temperature -40 to +85 °C Tstg Storage Temperature -55 to +125 °C 7. RECOMMENDED OPERATING CONDITIONS (VSS=0V, Topt=-40 to +85 °C) Symbol Item Pin Name Min, Typ. Max. Unit VDD Supply Voltage 2.0 5.5 V VCLK Timekeeping Voltage 1.45 5.5 V fXT Oscillation Frequency 32.768 kHz VPUP Pull-up Voltage SCL, SDA, /INTRA, /INTRB, /INTRC 5.5 V |
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