RV5C338A-E2-F

Real Time Clock Overview

The RV5C338A-E2-F is a CMOS real-time clock IC featuring a 3-wire serial interface (CE, SCLK, SIO) and integrated voltage monitoring. It operates with a timekeeping supply voltage range of 1.45 V to 5.5 V and consumes a typical standby current of 0.35 µA at 3 V. The device includes BCD-format time and calendar counters, two alarm circuits, periodic interrupt generation, and a 32-kHz clock output. It utilizes an ultra-compact 10-pin SSOP-G package (4.0 × 2.9 mm, 1.20 mm height) with built-in oscillation stabilization capacitors and high-precision frequency adjustment capabilities.

Real Time Clock Feature Summary

• 3-Wire Serial Interface: Connects via CE, SCLK, and SIO lines with a maximum clock frequency of 2 MHz.
• Voltage Monitoring: Includes a supply voltage monitoring circuit with selectable thresholds (1.6 V or 2.1 V) and records voltage drops.
• Oscillation Halt Sensing: Detects crystal oscillator halts to validate internal data integrity after power events.
• High-Precision Adjustment: Built-in correction circuit allows time count gain/loss adjustment up to ±189 ppm.

Real Time Clock Applications

• Communication devices such as multi-function phones, portable phones, PHS, and pagers.
• Office automation equipment including fax machines and portable faxes.
• Computers like desktops, mobile PCs, PDAs, and electronic notebooks.
• Audio/Video components such as portable audio units, video cameras, and digital cameras.
• Home appliances including rice cookers and electric ovens.

Real Time Clock Procurement Notes

Verify component authenticity through authorized distributors, as the RS5C338A series has been discontinued by Nisshinbo Micro Devices. Confirm that the specific RV5C338A variant matches the required SSOP-G package dimensions and lead plating specifications before integration into production designs.

Real Time Clock Selection Notes

Select this model for applications requiring low standby current and compact footprint. Ensure the design supports the 3-wire serial protocol and provides adequate pull-up resistors for the INTR pin. Verify that the operating temperature range of -40°C to +85°C meets system requirements and that the 1.45 V minimum timekeeping voltage aligns with the battery backup strategy.

Real Time Clock Part Context

The RV5C338A belongs to the R×5C338A family of real-time clocks from Nisshinbo Micro Devices. It shares functional similarities with the RS5C338A but differs in packaging; the RV5C338A uses the smaller SSOP-G format compared to the standard SSOP used by the RS5C338A. Both variants feature identical electrical characteristics and register maps.

Real Time Clock Replacement Considerations

The RS5C338A series is discontinued. While the RS5C338A is functionally compatible, it uses a larger SSOP package. No other direct substitutes are confirmed in the provided documentation. Designers should evaluate board space constraints when substituting between SSOP and SSOP-G packages.