RTC-8564JE0:ROHS Equivalent & Substitute Parts

Part Overview

The RTC-8564JE0:ROHS is a Real Time Clock (RTC) IC with Clock/Calendar functionality manufactured by EPSON. This 20-pin surface mount device operates over a 1.8V to 5.5V supply range and provides I2C/2-Wire Serial interface for time and date management with alarm capabilities and Y2K compliance. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and new production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	RTC-8564JE0:ROHS
Manufacturer	EPSON
Category	Clock/Timing
Type	Clock/Calendar
Interface	I2C, 2-Wire Serial
Package / Case	20-LSSOJ (0.213", 5.40mm Width)
Voltage - Supply	1.8V ~ 5.5V
Current - Timekeeping (Max)	0.7µA ~ 0.8µA @ 3V ~ 5V
Operating Temperature	-40°C ~ 85°C
Time Format	HH:MM:SS
Date Format	YY-MM-DD-dd
Features	Alarm, Y2K
RoHS Status	ROHS3 Compliant
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the RTC-8564JE0:ROHS is determined by the following critical parameters:

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

Voltage Supply Range: Substitute parts must operate within or encompass the 1.8V to 5.5V supply range. Parts with narrower ranges (e.g., 2.3V minimum) are acceptable if the application operates within their specified limits.

Operating Temperature: All substitutes must support the -40°C to 85°C temperature range.

Time and Date Format: Substitute parts must support HH:MM:SS time format and YY-MM-DD-dd date format.

Package Consideration: The original 20-LSSOJ package is a 20-pin configuration. Substitutes may use different package types (8-pin, 20-pin SOIC, etc.) depending on application requirements and PCB redesign feasibility.

Functional Features: Alarm capability is a key feature of the original part. Substitutes with alarm functionality provide direct compatibility; parts without alarms require application-level assessment.

Compliance: All substitutes must maintain ROHS3 compliance and EAR99 export classification.

Parameter Comparison

Parameter	RTC-8564JE0:ROHS	BU9873NUX-TTR	DS1308U-3+	DS1308U-3+T	DS1337S+	DS1340U-18+	DS3232SN#T&R	ISL12022IBZ	ISL12022IBZ-T7A	ISL12022MIBZ-T	ISL1208IU8Z
Manufacturer	EPSON	Rohm Semiconductor	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Renesas Electronics Corporation	Renesas Electronics Corporation	Renesas Electronics Corporation	Renesas Electronics Corporation
Interface	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial	I2C, 2-Wire Serial
Voltage - Supply	1.8V ~ 5.5V	1.8V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	1.8V ~ 5.5V	1.71V ~ 5.5V	2.3V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Time Format	HH:MM:SS	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)	HH:MM:SS (12/24 hr)
Date Format	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd	YY-MM-DD-dd
Package / Case	20-LSSOJ (0.213", 5.40mm Width)	8-UFDFN Exposed Pad	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-SOIC (0.154", 3.90mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	20-SOIC (0.295", 7.50mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	20-SOIC (0.295", 7.50mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Features	Alarm, Y2K	Alarm, Leap Year	Leap Year, NVSRAM, Square Wave Output	Leap Year, NVSRAM, Square Wave Output	Alarm, Leap Year, Square Wave Output	Leap Year, Trickle-Charger	Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal	Alarm, Daylight Savings, Leap Year, SRAM	Alarm, Daylight Savings, Leap Year, SRAM	Alarm, Daylight Savings, Leap Year, SRAM	Alarm, Leap Year, SRAM
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (20-Pin Package):

DS3232SN#T&R and ISL12022MIBZ-T are the primary candidates. Both are 20-pin SOIC packages suitable for direct PCB replacement of the RTC-8564JE0:ROHS. DS3232SN#T&R is Active status with extended memory (236B) and integrated TCXO/Crystal. ISL12022MIBZ-T is Active status with 128B memory and daylight savings support. Both maintain full I2C compatibility, support the required voltage range, and are ROHS3 compliant.

For Space-Constrained Applications (8-Pin Packages):

BU9873NUX-TTR, DS1308U-3+, DS1308U-3+T, DS1337S+, DS1340U-18+, ISL12022IBZ, ISL12022IBZ-T7A, and ISL1208IU8Z offer reduced footprint options. All support I2C interface and required temperature range. DS1337S+, DS1340U-18+, ISL12022IBZ, ISL12022IBZ-T7A, and ISL1208IU8Z are Active status products. These require PCB redesign but provide space savings and long-term availability.

For New Designs:

Active status parts (DS1308U-3+, DS1308U-3+T, DS1337S+, DS1340U-18+, DS3232SN#T&R, ISL12022IBZ, ISL12022IBZ-T7A, ISL12022MIBZ-T, ISL1208IU8Z) are recommended. BU9873NUX-TTR is marked "Not For New Designs" and should be avoided in new development.

Voltage Supply Consideration:

DS1340U-18+ offers the lowest minimum supply voltage (1.71V), providing additional margin for low-power applications. DS1337S+ and BU9873NUX-TTR match the original 1.8V minimum. All other substitutes require minimum 2.3V to 2.7V supply.

Current Consumption:

ISL1208IU8Z (4µA ~ 6µA @ 3V ~ 5V) and ISL12022 variants (14µA ~ 15µA @ 3V ~ 5V) offer lower timekeeping current than the original part (0.7µA ~ 0.8µA @ 3V ~ 5V). DS1337S+ (0.6µA @ 1.3V ~ 1.8V) provides comparable ultra-low power performance.

Frequently Asked Questions (FAQ)

Q: Can I use an 8-pin substitute in place of the 20-pin RTC-8564JE0:ROHS without firmware changes?

A: No. While 8-pin substitutes maintain I2C protocol compatibility, they require PCB redesign due to different pin configurations and package footprints. Firmware compatibility depends on register-level compatibility with the specific substitute part. Consult the substitute part datasheet for register mapping differences.

Q: Which substitute offers the closest electrical match to the RTC-8564JE0:ROHS?

A: DS3232SN#T&R and ISL12022MIBZ-T are the closest matches. Both are 20-pin packages supporting the full 1.8V to 5.5V range (DS3232SN#T&R: 2.3V minimum; ISL12022MIBZ-T: 2.7V minimum), I2C interface, and alarm functionality. DS3232SN#T&R provides additional features including integrated TCXO and extended SRAM.

Q: Is the RTC-8564JE0:ROHS still available for purchase?

A: The RTC-8564JE0:ROHS is obsolete. Current inventory of 840 pieces is available through authorized distributors, but long-term availability is not guaranteed. For ongoing production, transition to an Active status substitute part.

Q: What is the difference between the DS1308U-3+ and DS1308U-3+T variants?

A: Both DS1308U-3+ and DS1308U-3+T are functionally identical 8-pin RTC devices with 56B memory, supporting I2C interface, 2.7V to 5.5V supply, and -40°C to 85°C operation. The primary difference is packaging: DS1308U-3+ is supplied in Tube packaging, while DS1308U-3+T packaging is not specified. Consult the supplier for specific packaging details.

Q: Can I substitute a part with a lower minimum supply voltage (e.g., DS1340U-18+ at 1.71V) in a 3.3V system?

A: Yes. DS1340U-18+ operates across 1.71V to 5.5V, which encompasses 3.3V operation. Lower minimum voltage specifications provide additional design margin and are compatible with higher voltage systems as long as the maximum voltage rating is not exceeded.

Q: Which substitute has the lowest power consumption for battery-backed timekeeping?

A: DS1337S+ specifies 0.6µA @ 1.3V to 1.8V, matching the ultra-low power performance of the original RTC-8564JE0:ROHS. ISL1208IU8Z (4µA ~ 6µA @ 3V ~ 5V) and ISL12022 variants (14µA ~ 15µA @ 3V ~ 5V) consume more power but remain suitable for battery-backed applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and maintain EAR99 export classification, matching the compliance profile of the original RTC-8564JE0:ROHS.

Q: What is the significance of the ISL12022 "Daylight Savings" feature?

A: The Daylight Savings feature in ISL12022 variants (ISL12022IBZ, ISL12022IBZ-T7A, ISL12022MIBZ-T) provides automatic time adjustment capability for daylight saving time transitions. The original RTC-8564JE0:ROHS does not include this feature. Applications requiring automatic DST adjustment should select ISL12022 variants; applications managing DST in firmware should select alternatives.

Q: Can I use ISL1208IU8Z as a direct replacement for the RTC-8564JE0:ROHS?

A: ISL1208IU8Z is not a direct replacement due to package differences (8-pin MSOP vs. 20-pin LSSOJ) and reduced memory (2B vs. unspecified). However, it provides I2C compatibility, alarm functionality, and Active product status. Use ISL1208IU8Z only if PCB redesign is feasible and application memory requirements are met.

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