rs5c338a RICOH Co.,Ltd., rs5c338a Datasheet - Page 3

• Manufacturer Part Number: rs5c338a
• Description: 3-wire Serial Interface Real-time Clock Ics With Voltage Monitoring Function
• Manufacturer: RICOH Co.,Ltd.

PIN DESCRIPTIONS
Pin No. Symbol
10
4
2
3
6
1
7
9
8
5
32KOUT 32-kHz Clock Output
OSCOUT
OSCIN
CLKC
SCLK
INTR
VDD
VSS
SIO
CE
Positive Power Supply Input
Negative Power Supply Input
Chip Enable Input
Serial Clock Input
Serial Input/Output
Interrupt Output
Clock Control Input
Oscillation Circuit
Input/Output
Name
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.
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.
The SIO pin is used to input and output data intended for writing and reading in
synchronization with the SCLK pin. CMOS input/output.
interrupt signals (Alarm_W, Alarm_D). Disabled at power-on from 0 volts.
Nch. open drain output.
The 32KOUT pin is used to output 32.768-kHz clock pulses. Enabled at power-on
from 0 volts. CMOS output. This pin is disabled if the CLKC pin is set to low or
open.
The CLCK pin is used to control output of the 32KOUT pin. The clock output is
disabled and held low when the pin is set to low or open. Incorporates a pull-down
resistor.
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 R
The INTR pin is used to output periodic interrupt signals to the CPU and alarm
The VDD pin is connected to the power supply. The VSS pin is grounded.
Description
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5C338A.)
R
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5C338A
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