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RV5C339A Datasheet(PDF) 3 Page - RICOH electronics devices division

Part No. RV5C339A
Description  3-WIRE SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C339A Datasheet(HTML) 3 Page - RICOH electronics devices division

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RV5C339A
PIN DESCRIPTIONS
Pin No. Symbol
Name
Description
7CE
Chip Enable Input
The CE pin is used for interfacing with the CPU. Should be held high to allow
access to the CPU. Incorporates a pull-down resistor. Should be held low or open
when the CPU is powered off. Allows a maximum input voltage of 5.5 volts regard-
less of supply voltage.
2
SCLK
Serial Clock Input
The SCLK pin is used to input clock pulses synchronizing the input and output of
data to and from the SIO pin. Allows a maximum input voltage of 5.5 volts regard-
less of supply voltage.
3
SIO
Serial Input/Output
The SIO pin is used to input and output data intended for writing and reading in
synchronization with the SCLK pin. CMOS input/output.
6INTRA
Interrupt Output A
The INTRA pin is used to output periodic interrupt signals to the CPU and alarm
interrupt signals (Alarm_D). Disabled at power-on from 0 volts.
Nch. open drain output.
4
INTRB
Interrupt Output B
The INTRB pin is used to output alarm interrupt signals (Alarm_W). Disable at
power-on from 0 volts. Nch. open drain output.
1
32KOUT
32-kHz 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 RV5C339A is designed to be disabled
32-kHz clock output in response to a command from the host computer.
The OSCIN and OSCOUT pins are used to connect the 32.768-kHz crystal oscilla-
tor (with all other oscillation circuit components built into the RV5C339A.)
The VDD pin is connected to the power supply. The VSS pin is grounded.
9
OSCIN
Oscillation Circuit
8
OSCOUT
Input/Output
10
VDD
Positive Power Supply Input
5
VSS
Negative Power Supply Input


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