DATA SHEET LND555 PRECISION TIMING CIRCUIT GENERAL DESCRIPTION The LND555 is a monolithic timing circuit capable of producing accurate time delays or oscillation. In the time delay mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the astable mode of operation, the frequency and duty cycle may be independently controlled with two external resistors and a single external capacitor. PIN CONFIGURATION FEATURES • Timing from Microseconds to hours • Astable or Monostable Operation • Adjustable Duty Cycle • TTL-Compatible Output Can Sink or Source UP to 200mA • Temperature Stability of 0.005% per °C • Direct Replacement for Signetics NE555 Timers APPLICATIONS • Precision timing Gnd 1 8 Vcc • Pulse generation Trigger 2 7 Discharge • Sequential timing Out 3 6 Threshold • Time delay generation Reset 4 5 Control Voltage • Pulse width modulation • Pulse position modulation • Missing pulse detector • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND555 Absolute Maximum Rating (TA = 25°C, unless otherwise specified) PARAMETER MIN MAX 4.5 16 Supply Voltage, Vcc Input Voltage(control, reset, threshold and trigger) UNITS V Vcc Output Current ±200 mA 70 °C Operating Free-Air Temperature Storage Temperature Range, TSTG -65 +150 Function Table RESET TRIGGER VOLTAGE THRESHOLD VOLTAGE* OUTPUT DISCHARGE SWITCH Low Irrelevant Irrelevant Low On High <1/3VCC High High Off High >1/3 VCC >2/3 VCC Low On High >1/3 VCC *Voltage Levels shown are normal <2/3Vcc As previously established Block Diagram RESET can override TRIGGER, which can override THRESHOLD • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND555 Electrical Characteristics (TA =25°C, Vcc=+5 to +15V, unless otherwise specified ) Test Conditions (see note 2) Parameter Operating Supply Voltage Range Min Typ 4.5 Max 16 Units V VCC=15V 8.8 10 11.2 V VCC=5V (see Note 1) VCC=15V 2.4 3.3 30 5 4.2 250 5.6 V nA V VCC=5V Trigger at 0 V 1.1 1.67 0.5 0.7 0.1 2.2 2 1 0.4 µA V -0.4 20 10 -1.5 100 11 3.3 0.1 0.4 2 2.5 0.25 0.3 13.3 12.5 3.3 10 3 9 2 4 0.25 0.75 2.5 1 3 5 13 50 150 0.1 0.3 150 500 0.5 1 ppm/° C 100 300 ns 100 300 ns Threshold Voltage Level Threshold Current(see Note 1) 4.5 Trigger Voltage Level Trigger Current Reset Voltage Level 0.3 Reset at VCC mA Reset Current Reset at 0V Discharge Leakage Current 9 Vcc=15V nA V Control Voltage Level VCC=5V VCC=15V Low-Level Output Voltage VCC=5V High- Level Output Voltage Supply Current Initial Error of Timing Interval (see Note 3) Temperature Coefficient of Timing Interval Supply Voltage Sensitivity of Timing Interval Output Pulse Rise Time Output Pulse Fall Time VCC=15V Output low, No Load Output High, No Load Monostable (note 4) Astable (note 5) Monostable Astable Monostable Astable CL = 15pF, TA =25 °C CL = 15pF, TA =25 °C 2.6 IOL=10mA IOL=50mA IOL=100mA IOL=200mA IOL=5mA IOL=8mA IOL= -100mA IOL= -200mA IOL= -100mA VCC=15 V VCC=5 V VCC=15 V VCC =5 V 12.75 2.75 TA =25 °C V 0.35 0.4 V 15 6 13 5 TA =25 °C TA = MIN to MAX V mA % %/V • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com • LND555 Notes: 1. This parameter influences the maximum value of the timing resistors RA and RB in the circuit on Figure 1. For example, when Vcc=5V, the maximum value is R=RA+RB=3.4 MΩ, and Vcc=15V, the maximum value is 10MΩ. 2. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. 3. Timing interval error is defined as the difference between the measured value and the average value of a random sample from each process run. 4. Values specified are for a device in a monostable circuit similar to Figure.2, with component values as follow: RA=2KΩ to 100 KΩ, C=0.1µF. 5. Values specified are for a device in an astable circuit similar to Figure.1, with component values as follow: RA, RB=1KΩ to 100KΩ, C=0.1µF. Typical Application Data LND555 Figure 1 :Circuit for Astable Operation LND555 Figure 2 : Circuit for Monostable Operation Note A : Bypassing the control voltage input to the ground with a capacitor may improve operation. This should be evaluated for individual applications • Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •