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RS5C372 Series

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

  • PLP
  • RoHS

The RS5C372 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 RS5C372 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. (Ver. A: Nch. open drain output, Ver. B: 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 RS5C372 is the optimum choice for equipment requiring small sized and low power consuming products.

Specs & Datasheets

   
Timekeeping Supply Voltage Range RS5C372A: 1.3 V to 6.0 V
RS5C372B: 1.45 V to 6.0 V
Supply Current Typ. 0.5 µA
Connection to CPU Two Signal Lines (I2C Bus Interface, MAX. 400 kHz, 7-bit address)
Clock Output 32.768 kHz or 32.000 kHz
RS5C372A: Nch Open Drain Output Controllable by Command
RS5C372B: CMOS Output Controllable by Command
Package SSOP8

Download Datasheet

Protections / Functions

Functional Description

ECO Clock Adjust OSC Halt Sensing Supply Voltage Monitoring Circuit Automatic Identification of Leap Years Selectable 12-hour and 24-hour Backup Switch
     

Technical Documents

Typical Application

Typical Application

*) The SCL and SDA pins of the RS5C372A do not contain protective diodes on VDD side. Therefore, back up power supply≤system power supply causes no adverse effect.

Typical Application

Typical Application

*) 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.

Quality & Packages

Product Name Compatibility Package Marking Reliability
RS5C372A-E2-F/FB
  • gradeConsumerC
  • plpP
SSOP8 RS5C372 RS5C372-F
RS5C372B-E2-F/FB
  • gradeConsumerC
SSOP8 RS5C372 RS5C372-F

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

Functional Description

ECO ECO Function
Clock Adjust Clock Adjust Function
OSC Halt Sensing OSC Halt Sensing Function
Supply Voltage Monitoring Circuit Supply Voltage Monitoring Function
Automatic Identification of Leap Years Automatic Identification of Leap Years
Selectable 12-hour and 24-hour Selectable 12-hour and 24-hour
Built-in VD with Delay Time Built-in VD with Delay Time

Search for similar products under conditions below.

Category:Real Time Clock

Interface 2-wire
Time Keeping
Current (µA)
0.5
Time Keeping
Voltage min (V)
1.3
Time Keeping
Voltage max (V)
6.00