Real Time Clock

Epson's wide range of Real Time Clock Modules (RTC) with built-in XTAL save power, provide superior accuracy, and simplify system design. Thanks to a rich set of optional functions, such as alarms and time stamps, RTCs can cover multiple additional tasks beside the time keeping.


Recommended Products

Model Size
[ mm ]
Interface
and
Feature
Frequency tolerance
[ x10^-6 ]
Alarm Memory Timer Power Switching Back up Current
[µA]
Voltage Range
[V]
RoHS
REACH
Brief
Sheet
App
manual
Linux
®
Driver
Inventory
2 RX6110SA A
(Custom)
10.1 x 7.4 x 3.3 SPI or I2C-Bus

Low
Power
Built-in
SRAM
A : 5±11.5
/ +25°C
0.17 1.1 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM49E-01) pdf
Contact us
1 RX6110SA B 10.1 x 7.4 x 3.3 SPI or I2C-Bus

Low
Power
Built-in
SRAM
B : 5±23
/ +25°C
0.13 1.1 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM40E-03) pdf
RX6110SA B
1 RX-4803SA 10.1 x 7.4 x 3.3 SPI-Bus

Built-in
DTCXO
UA : ±3.4
/ -40 to +85°C

UB : ±5.0
/ -40 to +85°C

UC : ±5.0
/ -30 to +70°C

AA : 5±5.0
/ +25°C
0.75 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM33E-04) pdf
RX-4803SA
2 RX-4803LC 3.6 x 2.4 x 1.2 SPI-Bus

Built-in
DTCXO
UA : ±3.4
/ -40 to +85°C

UB : ±5.0
/ -40 to +85°C

UC : ±5.0
/ -30 to +70°C

AA : 5±5.0
/ +25°C
0.75 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM33E-04)pdf
RX-4803LC
2 RX-4035SA 10.1 x 7.4 x 3.3 SPI-Bus

High
Stability
Built-in
Timestamp
AA : 5±5.0
/ +25°C

AC : 0±5.0
/ +25°C

B : 5±23
/ +25°C
0.35 1.0 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM36E-06) pdf
- RX-4035SA
2 RX-4035LC 3.6 x 2.4 x 1.2 SPI-Bus

High
Stability
Built-in
Timestamp
AA : 5±5.0
/ +25°C

AC : 0±5.0
/ +25°C

B : 5±23
/ +25°C
0.4 1.0 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM36E-06)pdf
- RX-4035LC
2 RX-4045SA 10.1 x 7.4 x 3.3 SPI-Bus

High
Stability
AA : 5±5.0
/ +25°C

AC : 0±5.0
/ +25°C
0.48 1.15 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM01E-03) pdf
- RX-4045SA
2 RX-4045NB 6.3 x 5.2 x 1.4 SPI-Bus

High
Stability
AA : 5±5.0
/ +25°C

AC : 0±5.0
/ +25°C
0.48 1.15 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM01E-03)pdf
- RX-4045NB
2 RX-4581NB 6.3 x 5.2 x 1.4 SPI-Bus

Built-in
SRAM
B : 5±23
/ +25°C
0.4 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM02E-02) pdf
- RX-4581NB
2 RX-4571LC 3.6 x 2.4 x 1.2 SPI-Bus

Low
Backup
Voltage
B : 5±23
/ +25°C
0.32 1.0 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM18E-04) pdf
- RX-4571LC
2 RX-4571NB 6.3 x 5.2 x 1.4 SPI-Bus

Low
Backup
Voltage
B : 5±23
/ +25°C
0.32 1.0 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM20E-03) pdf
- RX-4571NB
2 RX-4571SA 10.1 x 7.4 x 3.3 SPI-Bus

Low
Backup
Voltage
B : 5±23
/ +25°C
0.32 1.0 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM21E-02) pdf
- RX-4571SA
2 RX-4574LC 3.6 x 2.4 x 1.2 SPI-Bus

Simple
function
B : 5±23
/ +25°C
0.35 1.3 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM06E-04) pdf
- RX-4574LC
2 RTC-4574SA 10.1 x 7.4 x 3.3 SPI-Bus

Simple
function
B : 5±23
/ +25°C
0.5 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM05E-04) pdf
- RTC-4574SA
2 RTC-4574JE 7.3 x 6.2 x 1.5 SPI-Bus

Simple
function
B : 5±23
/ +25°C
0.5 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM05E-04)pdf
- RTC-4574JE
2 RTC-4574NB 6.3 x 5.2 x 1.4 SPI-Bus

Simple
function
B : 5±23
/ +25°C
0.5 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM05E-04)pdf
- RTC-4574NB
2 RTC-4543SA 10.1 x 7.4 x 3.3 SPI-Bus

Simple
function
B : 5±23
/ +25°C
1 1.4 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM09E-03) pdf
- RTC-4543SA
2 RTC-4543SB 11.6 x 8.0 x 2.0 Simple
function
B : 5±23
/ +25°C
1 1.4 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM09E-03)pdf
- RTC-4543SB
2 RA-4565SA
(AEC-Q200)
10.1 x 7.4 x 3.3 SPI-Bus

Extended
operating
temperature
range
(to +125°C)
B : 5±23
/ +25°C
0.5 1.5 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM24E-02) pdf
- Contact us
2 RA-4574SA
(AEC-Q200)
10.1 x 7.4 x 3.3 SPI-Bus

Simple
function
B : 5±23
/ +25°C
0.5 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM07E-03) pdf
- Contact us
1 RA4803SA
(AEC-Q200)
10.1 x 7.4 x 3.3 SPI-Bus

Built-in
DTCXO
UA : ±3.4
/ -40 to +85°C

UB : ±5.0
/ -40 to +85°C

UC : ±5.0
/ -30 to +70°C

AA : 5±5.0
/ +25°C
0.75 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM38E-03) pdf
Contact us
1 RX8900SA 10.1 x 7.4 x 3.3 I2C-Bus

Built-in
DTCXO,
High
Stability
UA : ±3.4
/ -40 to +85°C

UB : ±5.0
/ -40 to +85°C

UC : ±5.0
/ -30 to +70°C
0.7 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM45E-05) pdf
RX8900SA
1 RX8900CE 3.2 x 2.5 x 1.0 I2C-Bus

Built-in
DTCXO,
High
Stability
UA : ±3.4
/ -40 to +85°C

UB : ±5.0
/ -40 to +85°C

UC : ±5.0
/ -30 to +70°C
0.7 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM45E-05)pdf
RX8900CE
2 RX8010SJ 7.0 x 6.0 x 2.65 I2C-Bus

Low
current
consumption
Built-in
SRAM
B : 5±23
/ +25°C
0.16 1.1 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM37E-06) pdf
RX8010SJ
1 RX8130CE 3.2 x 2.5 x 1.0 I2C-Bus

Backup
battery
B : 5±23
/ +25°C
0.3 1.1 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM50E-04) pdf
RX8130CE
2 RX-8571SA 10.1 x 7.4 x 3.3 I2C-Bus

Low
current
consumption
Built-in
SRAM
Long-running
timer
(65535hours)
B : 5±23
/ +25°C
0.22 1.3 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM30E-02) pdf
- RX-8571SA
2 RX-8571NB 6.3 x 5.2 x 1.4 I2C-Bus

Low
current
consumption
Built-in
SRAM
Long-running
timer
(65535hours)
B : 5±23
/ +25°C
0.22 1.3 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM29E-02) pdf
- RX-8571NB
2 RX-8571LC 3.6 x 2.4 x 1.2 I2C-Bus

Low
current
consumption
Built-in
SRAM
Long-running
timer
(65535hours)
B : 5±23
/ +25°C
0.22 1.3 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM28E-02) pdf
- RX-8571LC
2 RTC-8564JE 7.3 x 6.2 x 1.5 I2C-Bus

Low
current
consumption
B : 5±23
/ +25°C
0.275 1.1 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM11E-04) pdf
- RTC-8564JE
2 RTC-8564NB 6.3 x 5.2 x 1.4 I2C-Bus

Low
current
consumption
B : 5±23
/ +25°C
0.275 1.1 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM11E-04)pdf
- RTC-8564NB
2 RX-8564LC 3.6 x 2.4 x 1.2 I2C-Bus

Low
current
consumption
B : 5±23
/ +25°C
0.275 1.3 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM12E-03) pdf
- RX-8564LC
2 RX-8803SA 10.1 x 7.4 x 3.3 I2C-Bus

Built-in
DTCXO
High
Stabilty
UA : ±3.4
/ -40 to +85°C

UB : ±5.0
/ -40 to +85°C

UC : ±5.0
/ -30 to +70°C

AA : 5±5.0
/ +25°C
0.75 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM34E-06) pdf
RX-8803SA
2 RX-8803LC 3.6 x 2.4 x 1.2 I2C-Bus

Built-in
DTCXO
High
Stabilty
UA : ±3.4
/ -40 to +85°C

UB : ±5.0
/ -40 to +85°C

UC : ±5.0
/ -30 to +70°C

AA : 5±5.0
/ +25°C
0.75 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM34E-06)pdf
RX-8803LC
2 RX-8035SA 10.1 x 7.4 x 3.3 I2C-Bus

High
Stability
Built-in
Timestamp
AA : 5±5.0
/ +25°C

AC : 0±5.0
/ +25°C

B : 5±23
/ +25°C
0.35 1.0 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM35E-10) pdf
RX-8035SA
2 RX-8035LC 3.6 x 2.4 x 1.2 I2C-Bus

High
Stability
Built-in
Timestamp
AA : 5±5.0
/ +25°C

AC : 0±5.0
/ +25°C

B : 5±23
/ +25°C
0.4 1.0 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM35E-10)pdf
RX-8035LC
2 RX-8025SA 10.1 x 7.4 x 3.3 I2C-Bus

High
Stability
AA : 5±5.0
/ +25°C

AC : 0±5.0
/ +25°C
0.48 1.15 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM10E-04) pdf
- RX-8025SA
2 RX-8025NB 6.3 x 5.2 x 1.4 I2C-Bus

High
Stability
AA : 5±5.0
/ +25°C

AC : 0±5.0
/ +25°C
0.48 1.15 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM10E-04)pdf
- RX-8025NB
2 RX-8731LC 3.6 x 2.4 x 1.2 I2C-Bus

Unique
ID-ROM
Built-in
EEPROM
B : 5±23
/ +25°C
0.35 1.3 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM23E-04) pdf
- RX-8731LC
2 RX-8581SA 10.1 x 7.4 x 3.3 I2C-Bus

Simple
function
B : 5±23
/ +25°C
0.45 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM13E-04) pdf
- RX-8581SA
2 RX-8581JE 7.3 x 6.2 x 1.5 I2C-Bus

Simple
function
B : 5±23
/ +25°C
0.45 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM13E-04)pdf
- RX-8581JE
2 RX-8581NB 6.3 x 5.2 x 1.4 I2C-Bus

Simple
function
B : 5±23
/ +25°C
0.45 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdfAppManual
(ETM13E-04)pdf
- RX-8581NB
1 RA8900CE
(AEC-Q200)
3.2 x 2.5 x 1.0 I2C-Bus

Built-in
DTCXO,
High
Stability
UA : ±3.4
/ -40 to +85°C

UB : ±5.0
/ -40 to +85°C

UC : ±5.0
/ -30 to +70°C
0.7 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM44E-04) pdf
Contact us
2 RA8803SA
(AEC-Q200)
10.1 x 7.4 x 3.3 I2C-Bus

Built-in
DTCXO,
High
Stability
UA : ±3.4
/ -40 to +85°C

UB : ±5.0
/ -40 to +85°C

UC : ±5.0
/ -30 to +70°C

AA : 5±5.0
/ +25°C
0.75 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM39E-03) pdf
Contact us
2 RA-8565SA
(AEC-Q200)
10.1 x 7.4 x 3.3 I2C-Bus

Extended
operating
temperature
range
(to +125°C)
B : 5±23
/ +25°C
0.55 1.7 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM22E-01) pdf
- Contact us
2 RA-8581SA
(AEC-Q200)
10.1 x 7.4 x 3.3 I2C-Bus

Simple
function
B : 5±23
/ +25°C
0.45 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM14E-03) pdf
- Contact us
2 RTC-72423 16.3 x 7.9 x 2.8 Parallel

4-bit
Simple
function
A : ±20
/ +25°C

B : ±50
/ +25°C
0.9 2.0 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM17E-02) pdf
- RTC-72423
2 RTC-72421 23.1 x 6.3 x 4.2 Parallel

4-bit
Simple
function
A : ±10
/ +25°C

B : ±50
/ +25°C
0.9 2.0 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM17E-02)pdf
- RTC-72421
2 RTC-7301SF 10.2 x 5.4 x 2.0 Parallel

Built-in
Temperature
Sensor
B : 5±23
/ +25°C
0.6 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM15E-05) pdf
- RTC-7301SF
2 RTC-7301DG 23.1 x 6.3 x 4.2 Parallel

Simple
function
B : 5±23
/ +25°C
0.6 1.6 to 5.5 RoHSpdf REACHpdf BriefSheetpdf AppManual
(ETM15E-05)pdf
- RTC-7301DG
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