Real Time Clock Modules Surface Mount Type Digital Temperature Compensated RTC Modules KR3225Y Series CMOS/ 3.0V Typ./ 3.2×2.5mm RoHS Compliant Features How to Order • Miniature SMD type (3.2×2.5×1.0mm) • Built-in 32.768kHz D-TCXO −6 • Excellent frequency stability : ±5.0x10 / −40 to +85°C • Low supply current : 0.6μA typ (VDD=3.0V) • Temperature compensated voltage range : 2.0V to 5.5V • Time keeping voltage range : 1.3V to 5.5V • I2C-BUS interface voltage range : 1.5V to 5.5V • I2C-BUS serial interface type : 400kHz high speed type • Frequency selection function : 32.768kHz, 1024Hz, 32Hz, 1Hz • Voltage detection function : 2.0V temp. compensated voltage detection 1.5V Low Voltage Detection • Various functions including full calender, alarm and timer Frequency Tolerance (vs Temp.) : ±3.8×10−6/ −10°C to 60°C KR3225Y 32768 D G R 30 T xx ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ Frequency Tolerance (vs Temp.) : ±5.0×10−6/ −40°C to 85°C KR3225Y 32768 E A W 30 T xx ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ① Series ② Output Frequency ③ Frequency Stability ④ Lower Temperature −40°C A No Temp. Compensated A −10°C ±3.8×10−6 G D ±5.0×10−6 E ⑥ Supply Voltage ⑤ Upper Temperature 30 3.0V +85°C +60°C W R 33 50 3.3V 5.0V ⑦ Initial Frequency Applications Tolerance • High accuracy time references A 5±5×10 −6 B 0±5×10 −6 T TCXO ⑧ Option Code Packaging (Tape & Reel 3000 pcs./ reel) Specifications Pin Functions Item Symbol Nominal Frequency f_nom Time Keeping Voltage VDD Temperature Compensation Voltage VTEM Interface Voltage VINT Operationg Temperature Range T_use Frequency Stability vs. Temp. fo-Tc Start up Time t_str Power Supply Current1 ICC1 Power Supply Current2 ICC2 Low Voltage Detection Voltage Specification Conditions Min. Typ. Max. — — — No condensation E : Ta=−40 to +85°C Ta=25°C Ta=−40 to +85°C SCL=SDA=/ INT=VDD, CLKOE=VSS CLKOUT Non-operating output VDD=3V SCL=SDA=/ INT=VDD, CLKOE=VDD CLKOUT output 32.768kHz, VDD=3V Output at no load SCL=SDA=/ INT=VDD, CLKOE=VDD CLKOUT output 32.768kHz, VDD=3V CL=15pF VDET — 32.768 — 1.3 3.0 5.5 2.0 3.0 5.5 1.5 3.0 5.5 −40 +25 +85 −5.0 — +5.0 — — 1.0 — — 3.0 Unit kHz V V V °C ×10−6 sec sec Pin Name I/ O Function CLKOE I Input to control the output mode of the CLKOUT / INT O Outputs for alarm signals, timer signals, timer update signals and other signals Vss — Pin connected to ground CLKOUT O 32.768kHz signal output (CMOS output) Serial clock input for I2C BUS communications — 0.6 2.0 μA SCL I — 1.5 4.0 μA SDA I/ O Serial data input output for I2C BUS communications — 2.7 5.5 μA VDD — This pin is connected to a positive power supply 1.3 1.4 1.5 V ∗ Please contact us for other specifications. Block Diagram Dimensions (Unit: mm) Recommended Land Pattern (Unit: mm) 3.2±0.2 #8 #7 #6 #5 #1 #2 SDA 0.85 1.1 #1 #2 #3 #4 1.1 I2C-BUS INTERFACE / INT 0.5 TIMER REGISTER 0.7 SCL INTERRUPT CONTROL 0.55 #4 0.35 CLKOE CLKOUT CONTROL C0.15 0.45 CLKOUT #3 0.85 ALARM REGISTER 0.6 #8 #7 #6 0.4 0.5 0.5 0.5 CLOCK CALENDER COUNTER VDD VSS K 0.6 0.27 EEPROM DIVIDER 1.0 max. 32.768kHz 2.5±0.2 0.55 #5 R0.15 Pin No #1 #2 #3 #4 #5 #6 #7 #8 Function CLKOE / INT N.C VSS CLKOUT SCL SDA VDD 0.4 0.4 0.4 Note: A capacitor of value 0.01μF between VDD and GND is recommended.