S-3520CF

The S-3520CF is designed as a real time clock that inputs/outputs serial clock or calendar data into/from the CPU. A built-in voltage regulator provides good frequency stability and low power consumption. Even during backup operation, it is effective for saving battery life. S-3520CF has a built-in 120-bit SRAM, it is also useful for CPU data backup.

S-3520CF has many features. (1)Easy serial interface to CPU with 5 lines (/SCK, Sin, Sout, /CS and /WR). (2)Low current consumption: 3.0uA max at Vdd=5.0V during backup. (3)Wide data retention voltage range 2.0V to 6.0V. (4)Good frequency stability against fluctuating power supply voltage +/-5ppm at Vdd=2.0V to 6.0V. (5)Reference signal output can be selected from 1Hz and 1024Hz. (6)Data is serially output in BCD. (7)Clock and calendar data is modified by increment method. (8)Built-in auto-calendar until the year 2099. (9)Built-in counters for clock and calendar. (10)30s adjust function by software. (11)Built-in 30x4-bit SRAM. (12)14-pin SOP package. Those are all the main features.

Some absolute maximum ratings of S-3520CF have been concluded into several points as follow. (1)Its power supply voltage would be from -0.3V to 6.5V. (2)Its input voltage would be from -0.3V to Vdd+0.3V. (3)Its output voltage would be from -0.3V to 6.5V. (4)Its power dissipation would be 200mW. (5)Its storage temperature range would be from -55°C to 125°C. (6)Its operating temperature range would be from -30°C to 75°C. It should be noted that stresses above those listed in absolute maximum ratings may cause permanent damage to S-3520CF.

Also some electrical characteristics of S-3520CF are concluded as follow. (1)Its power supply voltage would be min 3.0V and typ 5.0V and max 6.0V. (2)Its data retention voltage would be min 2.0V and max 6.0V. (3)Its current consumption would be typ 30uA and max 100uA at /SCK=500kHz and would be typ 2.0uA and max 3.0uA at /SCK=Vdd. (4)Its high level output voltage would be min Vdd-0.3V. (5)Its low level output voltage would be max 0.1V. And so on. If you have any question or suggestion or want to know more information about S-3520CF please contact us for details. Thank you!