Real time clock module Product Number (Please contact us) RTC-72421 : Q42724212xxxx00 RTC-72423 : Q42724232xxxx00 4-bit REAL TIME CLOCK MODULE RTC - 72421 RTC - 72423 Built-in crystal unit allows adjustment-free efficient operation. 24 h /12 h changeable and leap year automatically adjustable (Gregorian calendar). Actual size RTC-72421 RTC-72423 Block diagram RTC-72421/72423 OSC D3 D2 D1 D0 Gate WR RD Gate A3 A2 A1 A0 CS0 Latch Counter RESET STOP bit bit 30 sec ADJ bit S1 to CF Decoder HOLD BUSY bit bit S1 S10 MI1 D1 D10 MO1 MO10 24/12 bit MI10 H1 H10 Y1 Y10 W Output Selector ALE CS1 CD CE CF STD.P 64 Hz 1 Second carry 1 Minute carry 1 Hour carry Terminal connection/External dimensions (Unit:mm) RTC-72423 (SOP 24-pin) Pin terminal STD.P /CS0 ALE A0 A1 A2 A3 /RD GND 23.1 Max. #18 1 2 3 4 5 6 7 8 9 #10 EPSON 6.3 RTC72421 A 1234A #1 #9 No. 18 17 16 15 14 13 12 11 10 Pin terminal VDD (VDD) (VDD) CS1 C0 D1 D2 D3 /WR No. 16.3 Max. #24 RTC62423 RTC72423 EPSON 1234A #1 #12 7.62 0.2 4.2 Min. Max. 1.52 0.46 2.54 2.8 Max. 3.3 Min. 1.27 0.25 0 -15 0.35 0.1 Min. Specifications (characteristics) Input voltage Storage temperature * Symbol VDD Condition Ta=+25 C Min. -0.3 Max. +7.0 VI/O Ta=+25 C GND-0.3 VDD+0.3 TSTG RTC-72421 RTC-72423 -55 -55 +85 +125 Clock voltage Operating temperature Condition - Min. 4.5 Max. 5.5 VCLK - 2.0 5.5 TOPR RTC-72421 RTC-72423 -10 -40 +70 +85 Item V Current consumption C HIGH input voltage (1) LOW input voltage (1) VIH1 VIL1 LOW output voltage (1) VOL1 IOL=2.5 mA - HIGH output voltage VOH IOH=-400 A 2.4 LOW output voltage (2) OFF leak current VOL2 IOFFLK IOL=2.5 mA V1=VDD/0 V Unit Frequency precision f /f Frequency temperature characteristics Frequency voltage characteristics Aging TOP Condition 72421A 72421B Ta=+25 C VDD=5.0 V 72423A 72423B -10 C to +70 C (+25 C) -40 C to +85 C(+25 C) Range 10 50 20 50 +10 / -120 +10 / -220 Symbol IDD1 IDD2 V Input capacity C Frequency characteristics Symbol 0 - 10 1.0 Unit Stored as bare produc after unpacking Item 0.2 *Refer to application manual for details. Operating range Symbol VDD Pin terminal VDD (VDD) (VDD) N.C. CS1 D0 N.C. N.C. D1 D2 D3 /WR 24 23 22 21 20 19 18 17 16 15 14 13 DC characteristics *Stored as bare product after unpacking Item Power voltage No. Metal may be exposed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec. Absolute Max. rating Item Supply voltage Pin terminal STD.P /CS0 N.C. ALE A0 N.C. A1 N.C. A2 A3 /RD GND 1 2 3 4 5 6 7 8 9 10 11 12 #13 7.9 No. 12.2 Max. RTC-72421 (DIP 18-pin) Unit C1 HIGH input voltage (2) VIH2 LOW input voltage (2) VIL2 Input leak current (1) ILK1 Input leak current (2) ILK2 10-6 f/V Ta=+25 C,VDD=2.0 V to 5.5 V 5.0 Max. 10-6/V fa Ta=+25 C,VDD=5.0 V,First year 5.0 Max. 10-6/year www.eea.epson.com Condition CS1= 0 V VDD=5 V Exclude input/ output current VDD=2 V - Input frequency 1 MHz VDD=2.0 V to 5.5 V Min. - Typ. 1 0.9 2.2 - - 5 0.8 V - V 0.4 10/-10 A 10 20 - 4/5 VDD - Unit Applicable terminal A All inputs other than CS1 0.4 - 1/5 VDD - V1=VDD/0 V Max. 10 1/-1 10/-10 pF D0 to D3 STD.P Input other than D0 to D3 D0 to D3 , STD.P V CS1 A Input other than D0 to D3 D0 to D3