X1228V14 Real Time Clock IC - Equivalent & Substitute Parts

Part Overview

The X1228V14 is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by Renesas Electronics Corporation. This device features I2C/2-Wire Serial interface, integrated alarm, leap year compensation, supervisor, and watchdog timer capabilities in a 14-TSSOP surface mount package. The X1228V14 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a 2.7V to 5.5V supply range with battery backup support from 1.8V to 5.5V, consuming 10µA to 20µA during timekeeping mode.

Key Parameters

Parameter	X1228V14 Specification
Manufacturer	Renesas Electronics Corporation
Product Status	Obsolete
Category	Clock/Timing - RTC Clock/Calendar
Interface	I2C, 2-Wire Serial
Time Format	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd
Voltage - Supply	2.7V ~ 5.5V
Voltage - Supply, Battery	1.8V ~ 5.5V
Current - Timekeeping (Max)	10µA ~ 20µA @ 2.7V ~ 5V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Features	Alarm, Leap Year, Supervisor, Watchdog Timer
RoHS Status	RoHS non-compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the X1228V14 is determined by the following critical parameters:

Interface Compatibility: All substitute parts must support I2C/2-Wire Serial protocol to maintain firmware and hardware compatibility.

Time and Date Format: Substitutes must support HH:MM:SS time format and YY-MM-DD-dd date format as specified in the original design.

Supply Voltage Range: The substitute must operate within or encompass the 2.7V to 5.5V supply range. Battery backup voltage support (1.8V to 5.5V) is required for continuous timekeeping during power loss.

Mounting Type: Surface mount technology is required to match the original PCB layout and assembly process.

Feature Set: Core features including alarm functionality and leap year compensation are essential for functional equivalence. Additional features such as square wave output, NVSRAM, or trickle-charger capability represent enhancements that do not prevent substitution.

Operating Temperature Range: The substitute must support at least the 0°C to 70°C range, though extended temperature ranges (-40°C to 85°C) are acceptable for industrial applications.

RoHS and Compliance Status: Active, RoHS3-compliant parts are preferred for new designs to meet current regulatory requirements, though RoHS non-compliant alternatives remain functionally equivalent.

Parameter Comparison

Part Number	Manufacturer	Status	Interface	Time Format	Date Format	Supply Voltage	Battery Voltage	Timekeeping Current	Temp Range	Package	Mount Type	RoHS
X1228V14	Renesas	Obsolete	I2C, 2-Wire	HH:MM:SS (12/24)	YY-MM-DD-dd	2.7V ~ 5.5V	1.8V ~ 5.5V	10µA ~ 20µA @ 2.7V ~ 5V	0°C ~ 70°C	14-TSSOP	Surface Mount	Non-compliant
AB-RTCMC-32.768KHZ-B5GA-S3-T	Abracon LLC	Active	I2C, 2-Wire	HH:MM:SS (24)	YY-MM-DD-dd	1.2V ~ 5.5V	—	0.45µA ~ 0.55µA @ 2V ~ 5V	-40°C ~ 85°C	10-SMD Module	Surface Mount	ROHS3
DS1337+	Analog Devices/Maxim	Active	I2C, 2-Wire	HH:MM:SS (12/24)	YY-MM-DD-dd	1.8V ~ 5.5V	—	0.6µA @ 1.3V ~ 1.8V	-40°C ~ 85°C	8-DIP	Through Hole	ROHS3
DS1338U-18+	Analog Devices/Maxim	Active	I2C, 2-Wire	HH:MM:SS (12/24)	YY-MM-DD-dd	1.71V ~ 5.5V	1.3V ~ 3.7V	100µA @ 1.89V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Surface Mount	ROHS3
DS1338Z-33+T&R	Analog Devices/Maxim	Active	I2C, 2-Wire	HH:MM:SS (12/24)	YY-MM-DD-dd	3V ~ 5.5V	1.3V ~ 3.7V	125µA ~ 200µA @ 3.63V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Surface Mount	ROHS3
DS1339AD+T	Analog Devices/Maxim	Active	I2C, 2-Wire	HH:MM:SS (12/24)	YY-MM-DD-dd	1.71V ~ 5.5V	1.3V ~ 3.7V	200µA @ 1.71V ~ 5.5V	-40°C ~ 85°C	8-TDFN EP	Surface Mount	ROHS3
DS1339AU+	Analog Devices/Maxim	Active	I2C, 2-Wire	HH:MM:SS (12/24)	YY-MM-DD-dd	1.71V ~ 5.5V	1.3V ~ 3.7V	200µA @ 1.71V ~ 5.5V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Surface Mount	ROHS3
DS1339U-3+	Analog Devices/Maxim	Active	I2C, 2-Wire	HH:MM:SS (12/24)	YY-MM-DD-dd	2.7V ~ 5.5V	1.3V ~ 3.7V	150µA @ 3.3V	-40°C ~ 85°C	8-TSSOP, 8-MSOP	Surface Mount	ROHS3
DS1340C-18#	Analog Devices/Maxim	Active	I2C, 2-Wire	HH:MM:SS (24)	YY-MM-DD-dd	1.71V ~ 5.5V	1.3V ~ 3.7V	100µA @ 1.89V	-40°C ~ 85°C	16-SOIC	Surface Mount	ROHS3
DS1340Z-18+	Analog Devices/Maxim	Active	I2C, 2-Wire	HH:MM:SS (24)	YY-MM-DD-dd	1.71V ~ 5.5V	1.3V ~ 3.7V	100µA @ 1.89V	-40°C ~ 85°C	8-SOIC	Surface Mount	ROHS3
DS1340Z-33+	Analog Devices/Maxim	Active	I2C, 2-Wire	HH:MM:SS (24)	YY-MM-DD-dd	2.97V ~ 5.5V	1.3V ~ 5.5V	150µA @ 5.5V	-40°C ~ 85°C	8-SOIC	Surface Mount	ROHS3

Engineering Selection Recommendations

For Active Production and New Designs:

The DS1339U-3+ offers the closest functional match to the X1228V14 with supply voltage range of 2.7V to 5.5V, matching the original specification. This part is active, RoHS3 compliant, and available in 8-TSSOP/8-MSOP surface mount package. The DS1339 series includes alarm functionality and leap year compensation with extended operating temperature range (-40°C to 85°C).

The DS1338U-18+ provides an alternative with integrated 56-byte NVSRAM, supporting the same I2C interface and time/date formats. This part operates from 1.71V to 5.5V with battery backup from 1.3V to 3.7V, and is RoHS3 compliant.

For Extended Temperature Applications:

All Analog Devices/Maxim DS13xx series parts support -40°C to 85°C operating range, exceeding the original 0°C to 70°C specification. These parts are suitable for industrial and automotive environments.

For Low-Power Applications:

The AB-RTCMC-32.768KHZ-B5GA-S3-T module from Abracon LLC offers the lowest timekeeping current consumption at 0.45µA to 0.55µA, compared to the X1228V14's 10µA to 20µA. This integrated module format operates from 1.2V to 5.5V and is RoHS3 compliant.

Compliance Considerations:

All recommended substitutes are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for new product designs. The original X1228V14 is RoHS non-compliant and obsolete, making transition to active alternatives necessary for ongoing production.

Frequently Asked Questions (FAQ)

Q: Can the DS1337+ replace the X1228V14 in existing designs?

A: The DS1337+ supports I2C interface, HH:MM:SS (12/24 hr) time format, and YY-MM-DD-dd date format, meeting core functional requirements. However, the DS1337+ is packaged in 8-DIP through-hole format, while the X1228V14 uses 14-TSSOP surface mount. PCB layout modification is required. The DS1337+ operates from 1.8V to 5.5V, which encompasses the X1228V14's 2.7V to 5.5V range.

Q: What is the difference between DS1338 and DS1339 series?

A: Both series support I2C interface and identical time/date formats. The DS1339 series includes trickle-charger capability and alarm functionality. The DS1338 series includes 56-byte NVSRAM for data storage. Both are RoHS3 compliant and active products. Selection depends on whether trickle-charger or NVSRAM functionality is required.

Q: Is the AB-RTCMC module suitable for direct replacement?

A: The AB-RTCMC module supports I2C interface and required time/date formats with superior low-power performance (0.45µA to 0.55µA). However, it is packaged as a 10-SMD module rather than a discrete IC. This format is suitable for new designs but requires different PCB layout and assembly considerations compared to the 14-TSSOP package.

Q: Why do some substitutes support only 24-hour time format?

A: The DS1340 series supports 24-hour time format only, while the X1228V14 and most DS13xx alternatives support both 12-hour and 24-hour formats. If 12-hour format is required, select DS1337+, DS1338, or DS1339 series parts.

Q: What is the impact of different supply voltage ranges?

A: The X1228V14 operates from 2.7V to 5.5V. Substitutes with lower minimum voltage (1.71V or 1.2V) provide greater flexibility in low-voltage applications. Substitutes with higher minimum voltage (3V) require higher supply rails. Verify that the selected substitute's voltage range encompasses your system's supply specifications.

Q: Are all substitutes RoHS compliant?

A: All listed substitutes are RoHS3 compliant except the original X1228V14, which is RoHS non-compliant. For new designs and production, RoHS3-compliant alternatives are required to meet current regulatory standards.

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