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RS5C372B
2-wire (I2C Bus) Serial Interface Real Time Clock (RTC)

Product Specifications

The RS5C372B is a CMOS type real-time clock which is connected to the CPU via 2-wires and capable of serial transmission of clock and calendar data to the CPU.
The RS5C372B can generate various periodic interrupt clock pulses lasting for long period (one month), and alarm interrupt can be made by days of the week, hours, and minutes by two incorporated systems. Since an oscillation circuit is driven at a constant voltage, it undergoes fluctuations of few voltage and consequently offers low current consumption (Typ. 0.5 µA at 3V). It also provides an oscillator halt sensing function applicable for data validation at power-on and other occasions and 32-kHz clock output for an external micro computer. (CMOS output) The product also incorporates a time trimming circuit that adjusts the clock with higher precision by adjusting any errors in crystal oscillator frequencies based on signals from the CPU. The crystal oscillator may be selected from 32.768 kHz or 32.000 kHz types. Integrated into an ultra compact and ultra thin 8 pin SSOP package, the RS5C372B is the optimum choice for equipment requiring small sized and low power consuming products.

FEATURES

Time keeping voltage 1.45 V to 6.0 V
Supply Current TYP. 0.5 µA
Connected to the CPU Only 2 wires (I2C bus Interface, MAX.400kHz, address 7 bits)
Clock Output 32.768 kHz or 32.000 kHz (Output controllable via a register), CMOS output
Oscillator 32.768 kHz or 32.000 kHz may be used
Functions A clock counter (counting hours, minutes, and seconds) and a calendar counter (counting leap years, years, months, days, and days of the week) in BCD codes
Interrupt to the CPU (period of one month to one second, interrupt flag, interrupt halt function) (INTRA, INTRB)
Two systems of alarm functions (days of the week, hours, and minutes) (INTRA, INTRB)
Oscillation halt sensing to judge internal data validity
Second digit adjustment by ±30 seconds
Automatic leap year recognition up to the year 2099
12-hour or 24-hour time display selectable
Built-in Circuits Oscillation stabilizing capacity (CG, CD)
High precision time trimming circuit
Package 8-pin SSOP

APPLICATION INFORMATION

*) The SCL and SDA pins of the RS5C372B do not contain protective diodes on VDD side. Therefore, back up power supply≤system power supply causes no adverse effect.

PIN DESCRIPTION

SSOP8

SSOP83.5 mm × 6.4 mm
1 32KOUT
2 SCL
3 SDA
4 VSS
5 INTR
6 OSCOUT
7 OSCIN
8 VDD

RS5C372B for Consumer

APPLICATIONS

  • Home appliances such as refrigerators, rice cookers, and electric pots
  • Digital appliances such as laptops, digital TVs, DSCs, camcorders, mobile phones, and private LAN system
  • Office appliances such as copiers, printers, facsimiles, scanners, and projectors

SELECTION GUIDE

Product Name   Package Quantity per Reel
RS5C372B-E2-# Consumter SSOP8 2,000
  • # … Designation of the lead plating
    F: Lead free plating
    FB: Sn-Bi plating

DOCUMENT/CONTACT

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Package *1 Reliability *2
SSOP8 RS5C372B

*1: The package file includes package dimensions, taping specifications, taping reels dimensions.
*2: Reliability file includes a reliability test report and a reflow profile.

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