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| Real time clock module 4-bit REAL TIME CLOCK MODULE Product number (please refer to page 2) RTC-72421/72423 Q42 7 2 4 2 1 x x x x x 0 0 Q42 7 2 4 2 3 x x x x x 0 0 * Built-in crystal unit allows adjustment-free efficient operation. * 12/24 h clock switchover function and automatic leap year setting. * Interrupt masking. Actual size RTC-72421 RTC-72423 The details are mentioned in the application manual. http://www.epsondevice.com Specifications (characteristics) Absolute Max. rating Symbol Item VDD Supply voltage VI/O Input and output voltage Storage temperature TSTG Condition Ta=+25 C Ta=+25 C RTC-72421 RTC-72423 Min. -0.3 GND -0.3 -55 -55 Max. 7.0 VDD+0.3 +85 +125 Unit V C Terminal connection RTC-72421 #18 #10 No. 1 2 3 4 5 6 7 8 9 No. 1 2 3 4 5 6 7 8 9 10 11 12 Pin terminal No. 18 STD. P 17 CS0 16 ALE 15 A0 14 A1 A2 13 A3 12 RD 11 GND 10 Pin terminal No. 24 STD. P 23 CS0 22 NC 21 ALE 20 A0 19 NC 18 A1 17 NC 16 A2 15 A3 14 RD 13 GND Pin terminal VDD (VDD) (VDD) CS1 D0 D1 D2 D3 WR Stored as bare product after unpacking #1 #9 Operating range Item Power voltage Supply voltage Operating temperature Symbol VDD VCLK TOPR Condition -- -- RTC-72421 RTC-72423 Min. 4.5 2.0 -10 -40 Max. 5.5 5.5 70 85 C Unit V V RTC-72423 #24 #13 Pin terminal VDD (VDD) (VDD) NC CS1 D0 NC NC No condensation Frequency characteristics Item Frequency tolerance Symbol Condition 72421 A 72421 B Ta=+25 C f/fo 72423 A VDD=5 V 72423 -10 C to +70 C (Reference at +25 C) TOP -40 C to +85 C (Reference at +25 C) Ta=+25 C f/V VDD=2.0 V to 5.5 V fa VDD=5 V, Ta=+25 C, first year Range 10 50 20 50 +10/-120 +10/-220 5 Max. 5 Max. x 10-6/V x 10 /year -6 #1 #12 D1 D2 D3 WR Unit (VDD) and VDD are to have the same level of voltage. Do not connect it to any external terminals. NC is not connected internally. -6 x 10 Frequency temperature characteristics Frequency voltage characteristics Aging External dimensions RTC-72421 (DIP 18-pin) 23.1 Max. (Unit: mm) RTC72421 A EPSON 1234A 7.62 0.2 Min. 0.25 DC characteristics Item Current consumption "H" input voltage (1) "L" input voltage (1) Input leak current (1) Input leak current (2) "L" output voltage (1) "H" output voltage "L" output voltage (2) Off leak current Input capacity "H" input voltage (2) "L" input voltage (2) Symbol Condition Min. Typ. Max. CS1=0 V VDD=5 V IDD1 1 10 Exclude input/ -- IDD2 output current VDD=2 V 0.9 5 2.2 VIH1 -- -- VIL1 0.8 ILK1 1 V1=VDD/0 V -- ILK2 -- 10 VOL1 IOL=2.5 mA 0.4 VOH IOH=-400 A 2.4 -- VOL2 IOL=2.5 mA 0.4 IOFFLK V1=VDD/0 V 10 -- 10 Input C1 frequency 1 MHz 20 -- 4/5 VDD VIH2 -- VDD=2 to 5.5 V -- VIL2 1/5 VDD Unit A V A Applicable terminal 4.2 6.3 90 to 105 2.54 0.65 Max. 3.3 Min. 12.2 Max. 7.9 -- All inputs other than CS1 Input other than D0 to D3 RTC-72423 (SOP 24-pin) 16.3 Max. D0 to D3 V A pF V STD.P Input other than D0 to D3 EPSON 1234A RTC72423 A D0 to D3 CS1 1.27 0.35 0.1 Min. 2.8 Max. 0 to 10 1.0 0.2 94 |
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