Skip to main content Skip to first level navigation

RICOH imagine. change.

RICOH ELECTRONIC DEVICES CO., LTD.

Skip to main content First level navigation Menu
Main content

Rx5C338A
3-wire Serial Interface Real Time Clock (RTC)

Product Specifications

The Rx5C338A are CMOS real-time clock ICs connected to the CPU by three signal lines CE (Chip Enable), SCLK (Serial Clock), and SIO (Serial Input/Output), and configured to perform serial transmission of time and calendar data to the CPU. These models incorporate different functional circuits. The periodic interrupt circuit is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month. The 2 alarm circuits generate interrupt signals at preset times. The oscillation circuit is driven under constant voltage so that fluctuations in oscillation frequency due to voltage are small and supply current is also small (TYP. 0.35 µA at 3 volts). The oscillation halt sensing circuit can be used to judge the validity of internal data in such events as power-on. The supply voltage monitoring circuit is configured to record a drop in supply voltage below two selectable supply voltage monitoring threshold settings. The 32-kHz clock output function is intended to output sub-clock pulses for the external microcomputer. The oscillation adjustment circuit is intended to adjust time counts with high precision by correcting deviations in the oscillation frequency of the crystal oscillator. SSOP10 and SSOP10G packages are available.

FEATURES

Timekeeping supply voltage 1.45 to 5.5 V
Supply Current Typ. 0.35 µA (VDD=3V)
Connected to the CPU Three signal lines (SCLK, SIO, and CE), Maximum clock frequency of 2 MHz (with VDD of 5 V)
Functions Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months, days, and weeks) (in BCD format)
Interrupt circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month) to the CPU and provided with an interrupt flag and an interrupt halt circuit
2 alarm circuits (Alarm_W for week , hour , and minute alarm settings and Alarm_D for hour and minute alarm settings)
Oscillation halt sensing circuit which can be used to judge the validity of internal data
Supply voltage monitoring circuit with two supply voltage monitoring threshold settings
Automatic identification of leap years up to the year 2099
Selectable 12-hour and 24-hour mode settings
Clock Output 32-kHz (CMOS output, equipped with a control pin)
Built-in Circuits Oscillation stabilization capacitors (CG and CD)
High precision oscillation adjustment
Packages SSOP10G, SSOP10

PIN DESCRIPTION

SSOP10G

SSOP10G2.9 mm × 4.0 mm
1 32KOUT
2 SCLK
3 SIO
4 CE
5 VSS
6 INTR
7 CLKC
8 OSCOUT
9 OSCIN
10 VDD

SSOP10

SSOP103.5 mm × 6.4 mm
1 32KOUT
2 SCLK
3 SIO
4 CE
5 VSS
6 INTR
7 CLKC
8 OSCOUT
9 OSCIN
10 VDD

Rx5C338 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
RV5C338A-E2-FB Consumter SSOP10G 2,000
RS5C338A-E2-FB Consumter SSOP10 2,000

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Reliability *2
SSOP10G RV5C338A
SSOP10 RS5C338A

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

Inquiry about products

Technical Support

Inquiries (SSL Form)

Inquiry about business

Purchase, Request for Samples and Documents

Distributors

Sample Online

Online Distributors