代理产线 理光微电子 Real Time Clock ICs (RTC)

Real Time Clock ICs (RTC)

Real Time Clock ICs, Real Time Clock Modules.

Ricoh offers a various lineup of real time clocks such as 4-wire (SPI)/ 3-wire/ 2-wire (I2C) serial interface and miniaturized low power consumption.

Built-in functions including clock adjustment and back-up battery switch-over function are available.

Product
Name
Time Keeping
Current
Typ. (at 3V)
Time Keeping Voltage Alarm Function 32kHz Clock Output Battery Checker Other Features Package Data Sheet
R2043 0.45 µA Typ. 0.66V to 5.50V
Worst.1.0V to 5.5V
2 Sets
(W/H/M, H/M)
Nch Open Drain Output
(Controllable by Command)
1.6V or 1.3V   QFN023023-16
TSSOP10G
DL
R2045 0.48 µA 1.15V to 5.50V 2 Sets
(W/H/M, H/M)
Nch Open Drain Output
(Controllable by Command)
2.1V or 1.3V Built-in Crystal Unit,
Frequency Deviation (05ppm)
SOP14 DL
Rx5C348A 0.35 µA 1.45V to 5.50V 2 Sets
(W/H/M, H/M)
Nch Open Drain Output
(Controllable by Command)
2.1V or 1.6V   SSOP10
SSOP10G
DL

Glossary

Time keeping current It means the consumption current which operates only clock and calendar without accessing CPU.
Time keeping voltage It means the voltage which operates only clock and calendar without accessing CPU.
The operating voltage to access CPU is specified in the other specification.
Alarm function It means the function which outputs the interrupt signal at the setting time.
Periodic interrupt function It means the interrupt function which outputs at constant periodic such as every seconds, every minutes, every hours and 1 month.
It is useful when indicating clock and calendar by using the RTC clock data.
32kHz clock output It is possible to output same clocks of crystal frequency which is used in RTC. There are four types of selectable outputs such as Open drain controllable by pin, Open drain keeping output enable, CMOS controllable by pin, CMOS with level shifter. It is suitable for CPU sub-clock.
The clock adjustment circuit It means the circuit which adjusts time gain or loss by the software. It is useful to compensate the crystal frequency deviation.
The OSC halt sensing circuit The circuit records past oscillation halt to internal register.
It can be used to judge the validity of internal data in such events as power-on.
Battery checker It records them as Flag when detecting voltage threshold of backup battery.
It is useful as checker of the output voltage for backup battery.
32768Hz/32000Hz
crystal selectable
RTC generally use 32768Hz crystal oscillator. But RS5C372A/B can select 32000Hz crystal oscillator as well as 32768Hz crystal oscillator. 32KOUT pin outputs 32000Hz clock pulses when 32000Hz crystal oscillator is used.
Battery back-up
switch-over function
R2051x, R2061x, R2062 and R2262 incorporate the automatic switch-over circuit which can switch between a main power supply and a back-up battery. Primary battery, Secondary battery, Electric double layered capacitor or Aluminum electrolytic capacitor are selectable as backup battery in R2051x and R2061x. Secondary battery, Electric double layered capacitor or Aluminum electrolytic capacitor are selectable as backup battery in R2062 and R2262. R2262 includes VR charger.
Frequency Deviation
(0±5ppm)
R2025S/D and R2045S/D incorporates 32768Hz crystal unit. The oscillation frequency is adjusted to high precision.(0±5ppm:at 25°C)
The deviation corresponds to ±13 seconds per every month.
By using the clock adjustment circuit, time deviation also can be calibrated to 3 or 6 or 9±5ppm.
ECO mode In the case that equivalent series resistance of crystal oscillator is low,(approximately equal or less than 45kΩ) time keeping current can be reduced, if ECO mode is active. There are a register setting type such as R2223x, and a pin setting type such as R2221x in the setting ECO mode.
Product Name Time Keeping
Current
Typ.(at 3V)
Time Keeping Voltage Alarm Function 32kHz Clock Output Battery Checker Other Features Package Data
Sheet
R2033 0.45 µA Typ.0.66V to 5.50V
Worst.1.0V to 5.5V
2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
1.6V or 1.3V   QFN023023-16
TSSOP10G
DL
R2061 0.4 µA Typ. 0.75V to 5.50V
Worst.1.0V to 5.5V
2 Sets
(W/H/M, H/M)
- 2.10V or 1.35V VD with DELAY Function,>
Back-up Battery Switch-over Function
(Detector Threshold Voltage: 1.7V, 2.4V, 2.8V)
QFN023023-16
SSOP16
DL
R2062 0.4 µA Typ.0.75V to 5.50V
Worst.1.0V to 5.5V
2 Sets
(W/H/M, H/M)
CMOS Output,
with Level Shifter
2.10V or 1.35V VD with DELAY Function,
Back-up Battery Switch-over Function
(Detector Threshold Voltage: 2.7V, 2.9V)*1
QFN023023-16 DL
R2262 0.3 µA Typ. 0.6V to 5.5V
Worst.0.9V to 5.5V
2 Sets
(W/H/M, H/M)
CMOS Output,
with Level Shifter
1.35V VD with DELAY Function,
Back-up Battery Switch-over Function
(Detector Threshold Voltage: 2.7V)*2
QFN0202-18
TSSOP10G
DL
Rx5C338A 0.35 µA 1.45V to 5.50V 2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
2.1V or 1.6V   SSOP10
SSOP10G
DL

*1 For secondary battery or capacitor

*2 For secondary battery or capacitor, built-in VR for charger

Glossary

Time keeping current It means the consumption current which operates only clock and calendar without accessing CPU.
Time keeping voltage It means the voltage which operates only clock and calendar without accessing CPU.
The operating voltage to access CPU is specified in the other specification.
Alarm function It means the function which outputs the interrupt signal at the setting time.
Periodic interrupt function It means the interrupt function which outputs at constant periodic such as every seconds, every minutes, every hours and 1 month.
It is useful when indicating clock and calendar by using the RTC clock data.
32kHz clock output It is possible to output same clocks of crystal frequency which is used in RTC. There are four types of selectable outputs such as Open drain controllable by pin, Open drain keeping output enable, CMOS controllable by pin, CMOS with level shifter. It is suitable for CPU sub-clock.
The clock adjustment circuit It means the circuit which adjusts time gain or loss by the software. It is useful to compensate the crystal frequency deviation.
The OSC halt sensing circuit The circuit records past oscillation halt to internal register.
It can be used to judge the validity of internal data in such events as power-on.
Battery checker It records them as Flag when detecting voltage threshold of backup battery.
It is useful as checker of the output voltage for backup battery.
32768Hz/32000Hz
crystal selectable
RTC generally use 32768Hz crystal oscillator. But RS5C372A/B can select 32000Hz crystal oscillator as well as 32768Hz crystal oscillator. 32KOUT pin outputs 32000Hz clock pulses when 32000Hz crystal oscillator is used.
Battery back-up
switch-over function
R2051x, R2061x, R2062 and R2262 incorporate the automatic switch-over circuit which can switch between a main power supply and a back-up battery. Primary battery, Secondary battery, Electric double layered capacitor or Aluminum electrolytic capacitor are selectable as backup battery in R2051x and R2061x. Secondary battery, Electric double layered capacitor or Aluminum electrolytic capacitor are selectable as backup battery in R2062 and R2262. R2262 includes VR charger.
Frequency Deviation
(0±5ppm)
R2025S/D and R2045S/D incorporates 32768Hz crystal unit. The oscillation frequency is adjusted to high precision.(0±5ppm:at 25°C)
The deviation corresponds to ±13 seconds per every month.
By using the clock adjustment circuit, time deviation also can be calibrated to 3 or 6 or 9±5ppm.
ECO mode In the case that equivalent series resistance of crystal oscillator is low,(approximately equal or less than 45kΩ) time keeping current can be reduced, if ECO mode is active. There are a register setting type such as R2223x, and a pin setting type such as R2221x in the setting ECO mode.
Product Name Time Keeping
Current
Typ.(at 3V)
Time Keeping Voltage Alarm Function 32kHz Clock Output Battery Checker Other Features Package Data
Sheet
R2023 0.45 gA Typ. 0.66V to 5.50V
Worst.1.0V to 5.5V
2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
1.6V or 1.3V   QFN023023-16
TSSOP10G
DL
R2025 0.48 gA 1.15V to 5.50V 2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
2.1V or 1.3V Built-in Crystal Unit,
Frequency Deviation (05ppm)
SOP14
SON22
DL
R2051 0.40 µA Typ. 0.75V to 5.50V
Worst.1.0V to 5.5V
2 Sets
(W/H/M, H/M)
CMOS Output,
with Level Shifter
2.10V or 1.35V VD with DELAY Function,
Back-up Battery Switch-over Circuit,
Detector Threshold Voltage: 2.4V, 2.8V, 4.0V
QFN023023-16
SSOP16
TSSOP10G
DL
R2221 0.3 µA *1 Typ. 0.6V to 5.5V
Worst. 0.9V to 5.5V
2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
1.35V ECO mode is set by ECO Pin. QFN018018-12
TSSOP10G
DL
R2223 ECO mode is set by a Register.
RS5C372A 0.5 µA 1.3V to 6.0V 2 Sets
(W/H/Mx2)
Nch Open Drain Output
(Controllable by Command)
32768 Hz/ 32000 Hz
Crystal Selectable
SSOP8 DL
RS5C372B 1.45V to 6.00V CMOS Output
(Controllable by Command)
RV5C386A 0.35 µA 1.45V to 5.50V 2 Sets
(W/H/M, H/M)
CMOS Output,
with Control Pin
2.1V or 1.6V   SSOP10G DL
RV5C387A 0.35 µA 1.45V to 5.50V 2 Sets
(W/H/M, H/M)
Nch Open Drain Output
(Controllable by Command)
2.1V or 1.6V   SSOP10G DL

*1 Time keeping current can be reduced in ECO mode.

Glossary

Time keeping current It means the consumption current which operates only clock and calendar without accessing CPU.
Time keeping voltage It means the voltage which operates only clock and calendar without accessing CPU.
The operating voltage to access CPU is specified in the other specification.
Alarm function It means the function which outputs the interrupt signal at the setting time.
Periodic interrupt function It means the interrupt function which outputs at constant periodic such as every seconds, every minutes, every hours and 1 month.
It is useful when indicating clock and calendar by using the RTC clock data.
32kHz clock output It is possible to output same clocks of crystal frequency which is used in RTC. There are four types of selectable outputs such as Open drain controllable by pin, Open drain keeping output enable, CMOS controllable by pin, CMOS with level shifter. It is suitable for CPU sub-clock.
The clock adjustment circuit It means the circuit which adjusts time gain or loss by the software. It is useful to compensate the crystal frequency deviation.
The OSC halt sensing circuit The circuit records past oscillation halt to internal register.
It can be used to judge the validity of internal data in such events as power-on.
Battery checker It records them as Flag when detecting voltage threshold of backup battery.
It is useful as checker of the output voltage for backup battery.
32768Hz/32000Hz
crystal selectable
RTC generally use 32768Hz crystal oscillator. But RS5C372A/B can select 32000Hz crystal oscillator as well as 32768Hz crystal oscillator. 32KOUT pin outputs 32000Hz clock pulses when 32000Hz crystal oscillator is used.
Battery back-up
switch-over function
R2051x, R2061x, R2062 and R2262 incorporate the automatic switch-over circuit which can switch between a main power supply and a back-up battery. Primary battery, Secondary battery, Electric double layered capacitor or Aluminum electrolytic capacitor are selectable as backup battery in R2051x and R2061x. Secondary battery, Electric double layered capacitor or Aluminum electrolytic capacitor are selectable as backup battery in R2062 and R2262. R2262 includes VR charger.
Frequency Deviation
(0±5ppm)
R2025S/D and R2045S/D incorporates 32768Hz crystal unit. The oscillation frequency is adjusted to high precision.(0±5ppm:at 25°C)
The deviation corresponds to ±13 seconds per every month.
By using the clock adjustment circuit, time deviation also can be calibrated to 3 or 6 or 9±5ppm.
ECO mode In the case that equivalent series resistance of crystal oscillator is low,(approximately equal or less than 45kΩ) time keeping current can be reduced, if ECO mode is active. There are a register setting type such as R2223x, and a pin setting type such as R2221x in the setting ECO mode.