NTE1537 Integrated Circuit CMOS, Digital Frequency Indicator w/Clock LED Function Applications: D Car Radio Applications: D Home Radio Applications: D Car Clock Applications: FM/AM Receiving Frequency Display and Clock Display FM/AM Receiving Frequency Display and Clock Display Hours–Minutes, Month–Date/Stopwatch Display Functions: D FM Receiving Frequency Display (4 Digits) D AM Receiving Frequency Display (4 Digits) D Month–Date or Stopwatch Display (Either of these Selectable) Features: D Single–Chip CMOS LSI for Static Display System D Capable of Direct Driving Green LED (Drive Capacity 15mA) D Capable of Selecting Frequency Display/Time Display D Use FM/AM Local Oscillation Signal of Varactor Diode, Variable Capacitor, or µ Tuning System to Digitally Display FM/AM Receiving Frequency D Covers 4 AM Intermediate Frequencies: +262.5, +452.5, +455, +470kHz D Covers 2 FM Intermediate Frequencies: +10.7, –10.7MHz D Capable of Fine–Adjusting AM/FM Display Frequency Error Independently • A variable Resistor can be used to Correct AM IF Error within ±2.8kHz • A variable Resistor can be used to Correct FM IF Error within ±140kHz D Two Selections of Display System (12–Hour System with PM Sign which is Displayed During Setting Only, 24–Hour System) D Programmed on Long Months (31 Days)/Short Months (30 Days). Date in February is Programmed to Count up to the 29th D Easy to Set Time by th Time Signal D Stopwatch Capable of Counting/Displaying 1 Second to 12 Hours, 59 Minutes, 59 Seconds D Inhibit Pin for Inhibiting Time Setting with Display Unlighted D 4MHz Crystal for Reference Frequency Absolute Maximum Ratings: (TA = +25°C, VSS = 0V unless otherwise specified) Maximum Supply Voltage, VDDmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to 11V (Cumulative applied time: 30min or less) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to 14V Reference Voltage (Vref ≤ VDD), Vref . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to 10V (Cumulative applied time: 30min or less) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to 13V Input Voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to VDD+0.3V Output Voltage (Output OFF), VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to VDD+0.3V Allowable Power Dissipation (TA ≤ +75°C), PDmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mW Allowable Power Disipation of Segment Output, PD(seg) Other than PM: IOL < 25mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mW PM: IOL < 75mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Allowable Operating Ranges: (TA = +25°C, VDD = 8 to 10.3V, VSS = 0V, Vref = 7.9 to 9V ≤ VDD, Vref = 0V if VDD < 8V unless otherwise specified) Parameter Supply Voltage Symbol Test Conditions Min Typ Max Unit VDD1 All function operating mode 8.0 9.3 10.8 V VDD2 Only clock operating mode 4.3 5.0 8.0 V 7.9 8.0 9.0 V 0.75VDD – VDD V VSS – 0.1VDD V 0.85VDD – VDD V VSS – 0.15VDD V 0.88VDD – VDD V Reference Voltage Vref Vref ≤ VDD Input “H” Level Voltage VIH1 INHI, VDD = 4.3 to 10.3V Input “L” Level Voltage VIL1 Input “H” Level Voltage VIH2 Input “L” Level Voltage VIL2 Input “H” Level Voltage VIH3 Input “L” Level Voltage VIL3 VSS – 0.12VDD V Input “M” Level Voltage VIM 0.36VDD – 0.64VDD V Input Frequency fIN1 Fin–FM, VP–P = 0.7V, Duty 50% 0.6 – 2.0 MHz fIN2 Fin–AM, VP–P = 0.7V, Duty 50% 0.4 – 2.5 MHz Operating Frequency fopg Crystal is externally connected across OSC–IN and OSC–OUT 3.5 – 4.2 MHz Input Amplitude VP–P Fin–FM, Fin–AM, Ceramic capacitor of 0.4µF is connected across VDD an VSS 0.7 – – VP–P FM/AM, IF–FM, IF–AM1, IF–AM2, 12H/24H SET, DEMAND, CTR/CLK Electrical Characteristics: (TA = +25°C, VDD = 8 to 10.3V, VSS = 0V, Vref = 7.9 to 9V, Vref ≤ VDD unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Input Current IIN FM–Fine, AM–Fine, VIN = 0V or Vref –1 – +1 µA Input “H” Level Current IIH1 IF–FM, IF–AM1, IF–AM2, CTR/CLK, 12H/24H, VIN = 0.9VDD –80 –30 –10 µA Input “L” Level Current IIL1 IF–FM, IF–AM1, IF–AM2, CTR/CLK, 12H/24H, VIN = 0V –3 – 0 µA Input “H” Level Current IIH2 FM/AM, VIN = 0.9VDD –40 –15 –5 µA Input “L” Level Current IIL2 FM/AM, VIN = 0V –3 – 0 µA SET, DEMAND 40 70 100 kΩ Middle Point Setting Resistance rs Note 1. + sign: Flowing into LSI – sign: Flowing out of LSI Electrical Characteristics (Cont’d): (TA = +25°C, VDD = 8 to 10.3V, VSS = 0V, Vref = 7.9 to 9V, Vref ≤ VDD unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 0.45VDD – 0.55VDD V Input Floating Voltage VIF3 SET, DEMAND, input floating Input “H” Level Current IIH4 INHI, VDD = 4.3 to 10.3V, VIN = VDD 15 – 400 µA Input Floating Voltage VIF4 INHI, VDD = 4.3 to 10.3V, input floating 0 – 0.3 V Feedback Resistance Rf1 Feedback resistance across OSC–IN and OSC–OUT – 3 – MΩ Rf2 Feedback resistance of Fin–FM – 3 – MΩ Rf3 Feedback resistance of Fin–AM – 3 – MΩ VOL1 PM, VDD = 8V, IOL = 45mA – – 0.7 V VOL2 Segment outputs other than PM VDD = 8V, IOL = 15mA – – 0.7 V Output Leakage Current IOFF All segment outputs, VDD = 10.3V, VOH = 10.3V – – 10 µA Current Dissipation IDD1 VDD = 10.3V, fopg = 4MHz (with crystal mounted), fIN2 = 2.5MHz (0.7VP–P) – 8 17 mA IDD2 VDD = 5.5V, fopg = 4MHz (with crystal mounted), Vref = 0V, INHI = 0 – 1.0 2.5 mA VDD = 10.3V, Vref = 9V, AM–Fine = FM–Fine = Vref – 0.5 1.5 mA Output “L” Level Voltage Iref Note 1. + sign: Flowing into LSI – sign: Flowing out of LSI Pin Connection Diagram Seg – d Digit 4 Seg – c Digit 4 Seg – g Digit 4 Seg – b Digit 4 FIN – FM FIN – AM IF – FM IF – AM 2 Vref IF – AM 1 FM/AM FM – Fine AM – Fine CTL/CLD SET Demand INHI 12/24 H OSC Output OSC Input VDD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 Seg – e Digit 4 Seg – f Digit 4 Seg – a Digit 4 Seg – b Digit 3 Seg – g Digit 3 Seg – c Digit 3 VSS Seg – d Digit 3 Seg – e Digit 3 Seg – f Digit 3 Seg – a Digit 3 Seg – b Digit 2 Seg – g Digit 2 Seg – c Digit 2 Seg – d Digit 2 Seg – e Digit 2 Seg – f Digit 2 Seg – a Digit 2 Seg – b Digit 1 Seg – c Digit 1 Seg – PM Digit 1 42 22 1 21 2.094 (53.2) .543 (13.8) .204 (5.18) .100 (2.54) 2.000 (50.8) .157 (3.9) .598 (15.2)