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PDF RTC72421 Data sheet ( Hoja de datos )
| Número de pieza | RTC72421 | |
| Descripción | 4-bit REAL TIME CLOCK MODULE | |
| Fabricantes | ETC | |
| Logotipo |  |
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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
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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| PDF Descargar | [ Datasheet RTC72421.PDF ] | |
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