RS5C372B-E2-F Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RS5C372B-E2-F

I2C bus SERIAL INTERFACE REAL-TIME CLOCK ICs

RICOH Co.,Ltd. 

RS5C372B

PIN DESCRIPTIONS

Pin No. Symbol

Name

Description

This pin is used to input shift clock pulses to synchronize data input/output to and

2

SCL Serial Clock Line

from the SDA pin with this clock. Up to 6V beyond VDD may be input.

This pin inputs and outputs written or read data in synchronization with shift clock

3

SDA Serial Data Line pulses from the SCL pin. Up to 6V beyond VDD may be input. This pin functions

as an Nch open drain output.

This pin outputs periodic interrupt pulses and alarm interrupt (Alarm_A, Alarm_B)

5 INTR Interrupt Output to the CPU. This pin is off when power is activated from 0V. This pin functions as

an Nch open drain output.

The 32KOUT pin is used to output 32.768kHz clock pulses (when 32.768kHz crys-

1 32KOUT 32-kHz Clock Output tal is used). Enabled at power-on from 0volts. CMOS output. The RS5C372B can

disable 32-kHz clock output in response to a command from the host computer.

These pins configure an oscillator circuit by connecting a 32.768kHz or 32.000kHz

7 OSCIN Oscillator Circuit

crystal oscillator between the OSCIN–OSCOUT pins.

6 OSCOUT Input/Output

(Any other oscillator circuit components are built into the RS5C372A.)

8 VDD Positive Power Supply Input

The VDD pin is connected to the positive power supply and VSS to the ground.

4

VSS Negative Power Supply Input

ABSOLUTE MAXIMUM RATINGS

Symbol

VDD

VI

VO

PD

Topt

Tstg

Item

Supply Voltage

Input Voltage

Output Voltage 1

Output Voltage 2

Output Voltage 3

Power Dissipation

Operating Temperature

Storage Temperature

Conditions

SCL, SDA

SDA

INTR

32KOUT

Topt=25˚C

Ratings

–0.3 to +7.0

–0.3 to +7.0

–0.3 to +7.0

–0.3 to +12

–0.3 to VDD+0.3

300

–40 to +85

–55 to +125

(Vss=0V)

Unit

V

V

V

mW

˚C

˚C

ABSOLUTE MAXIMUM RATINGS

Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under

any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation

above these absolute maximum ratings may cause degradation or permanent damage to the device. These

are stress ratings only and do not necessarily imply functional operation below these limits.

9

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