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RTC72421A
REAL TIME CLOCK MODULE RTC72421 The RTC72421 module is a Real Time Clock designed for use with microprocessors. The built-in 32.768 kHz standard clock quartz oscillator eliminates the need for regulation. The RTC72421 uses little or no external hardware (depending on application), and greatly enhances ease of incorporation into circuit designs. FEATURES • • • • • • • • Built-in quartz crystal Time and date functions 12/24 hour clock switchover and automatic leap year setting Faster access time @ 120 nS CMOS circuitry 18 pin dual in line package 4 bit parallel data string Application notes available * Actual Size Pin Connections 1. 2. 3. 4. 5. 6. 7. 8. 9. STD. P CS0 ALE A0 A1 A2 A3 READ GND 18. +5 VDC 17. +5 VDC 16. +5 VDC 15. CS1 14. D0 13. D1 12. D2 11.D3 10. WRITE • ELECTRICAL CHARACTERISTICS PARAMETERS Frequency Tolerance RTC 72421A RTC 72421B Frequency Stability Temperature Range Operating Temperature Storage Temperature Supply Voltage Input Current Output Voltage +10 +50 +10 PPM -10 -55 +4.5 (TOPR) (TSTG) (VDD) (IDD) (VOL) (VOH) (VI/O) (VDH) UNITS -10 -50 -120 -10°C ~ +70°C MAX +70 +85 +5.5 10 0.4 °C V µA V VDD +0.3V 5.5 +5.0 V V PPM Ta = 25°C 2.4 GND -0.3V 2.0 -5.0 Ta = 25°C Ta = 25°C; VDD = 5 V PPM RTC Input and Output Voltage Data Hold Voltage Aging (1st yr) MIN CONDITIONS Ta = 25°C; VDD = 5 V * Call Fox Customer Service for application notes. All specifications subject to change without notice. Rev. 10/29/97 All dimensions are in millimeters. FOXElectronics 5570 Enterprise Parkway Fort Myers, Florida 33905 941-693-0099 © 2000 FOX ELECTRONICS FAX 941-693-1554 http://www.foxonline.com 79
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