RTC72421

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 * ELECTRICAL CHARACTERISTICS PARAMETERS Frequency Tolerance RTC 72421A RTC 72421B Frequency Stability Temperature Range Operating Temperature Storage Temperature Supply Voltage Input Current Output Voltage Input and Output Voltage Data Hold Voltage Aging (1st yr) (TOPR) (TSTG) (VDD) (IDD) (VOL) (VOH) (VI/O) (VDH) CONDITIONS Ta = 25°C; VDD = 5 V -10°C ~ +70°C Ta = 25°C Ta = 25°C Ta = 25°C; VDD = 5 V * Call Fox Customer Service for application notes. All specifications subject to change without notice. Rev. 10/29/97 Pin Connections 1. STD. P 18. +5 VDC 2. CS0 3. ALE 4. A0 5. A1 6. A2 7. A3 8. READ 9. GND 17. +5 VDC 16. +5 VDC 15. CS1 14. D0 13. D1 12. D2 11.D3 10. WRITE Actual Size MIN -10 -50 -120 -10 -55 +4.5 2.4 GND -0.3V 2.0 -5.0 MAX +10 +50 +10 +70 +85 +5.5 10 0.4 VDD +0.3V 5.5 +5.0 UNITS PPM PPM °C V µA V V V PPM RTC All dimensions are in millimeters. FOXElect...