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The Epson Toyocom RTC-72421B and RTC-72423B modules are 4-bit parallel interface real-time clocks that can be connected directly to a microprocessor bus.
These devices feature a built-in crystal unit that enables highly accurate timekeeping with adjustment-free operation and reduced costs due to removing the need for connection to external components.
In addition to their time and calendar functions these modules feature 30s correction and fixed period interrupt functions.
These devices are ideally suited for use in applications requiring timing management, such as personal computers, dedicated word-processors, fax machines, multifunction telephones and sequencers.
- CMOS IC enables low current consumption
- Microprocessor bus compatible
- Compatible with Intel CPU bus
- Address Latch Enable (ALE) pin compatible with multiplex bus CPUs
- Time (hours, minutes, seconds) and calendar (year, month, day) counter
- 24hr./12hr. switchover and automatic leap year correction functions
- Fixed-period interrupt function
- Stop, start and reset functions
- Battery back-up functions
- DIL-18 (RTC-72421B) and SO-24 (RTC-72423B) package
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| Absolute max. rating | | | | |
VDD (V) | | –0.3 to +7.0 | | |
VI/O (V) | | GND–0.3 to VDD+0.3 | | |
Storage temperature | RTC-72421B | –55°C to +85°C | | |
| RTC-72423B | –55°C to +125°C | | |
Operating range | | | | |
VDD (V) | | 4.5 to 5.5 | | |
VCLK (V) | | 2.0 to 5.5 | | |
Operating temperature | RTC-72421B | –10°C to +70°C | | |
| RTC-72423B | –40°C to +85°C | | |
Frequency characteristics | | | | |
Precision | | ±50ppm | | |
Temperature characteristics | RTC-72421B | +10/–120ppm | | |
| RTC-72423B | +10/–220ppm | | |
Voltage characteristics | | ±5.0ppm/V max. | | |
Aging | | ±5.0ppm/year max. | | |
DC Characteristics | | | | |
Current consumption max. (µA) | @ VDD=5V | 10 | | |
Input capacity (pF) | Input other than D0 to D3 | 10 | | |
| D0 to D3, STD.P | 20 | | |
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