LND555

DATA SHEET LND555 PRECISION TIMING CIRCUIT GENERAL DESCRIPTION FEATURES 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. • • • • • • 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 PIN CONFIGURATION APPLICATIONS • Gnd Trigger Out Reset 1 2 3 4 8 7 6 5 Vcc Discharge Threshold Control Voltage • • • • • • Precision timing Pulse generation Sequential timing Time delay generation 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 Supply Voltage, Vcc Input Voltage(control, reset, threshold and trigger) Output Current Operating Free-Air Temperature Storage Temperature Range, TSTG MIN 4.5 MAX 16 Vcc ±200 70 UNITS V mA °C -65 +150 Function Table RESET Low High High TRIGGER VOLTAGE Irrelevant 1/3 VCC THRESHOLD VOLTAGE* Irrelevant High >2/3 VCC 1/3 VCC *Voltage Levels shown are normal 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 ) Parameter Operating Supply Voltage Range VCC=15V Threshold Voltage Level Threshold Current(see Note 1) Trigger Voltage Level Trigger Current Reset Voltage Level Reset Current Reset at 0V Discharge Leakage Current Vcc=15V Control Voltage Level VCC=5V VCC=15V Low-Level Output Voltage VCC=5V Test Conditions (see note 2) Min 4.5 8.8 2.4 4.5 1.1 0.3 Typ Max 16 Units V V V nA V 10 3.3 30 5 1.67 0.5 0.7 0.1 -0.4 20 10 3.3 0.1 0.4 2 2.5 0.25 0.3 13.3 12.5 3.3 10 3 9 2 1 11.2 4.2 250 5.6 2.2 2 1 0.4 -1.5 100 11 4 0.25 0.75 2.5 0.35 0.4 VCC=5V (see Note 1) VCC=15V VCC=5V Trigger at 0 V Reset at VCC µA V mA nA V V 9 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 TA =25 °C V 12.75 2.75 High- Level Output Voltage 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 V 15 6 13 5 3 % 13 150 500 0.5 1 300 300 ppm/° C %/V ns ns Supply Current mA 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 5 TA = MIN to MAX TA =25 °C 50 150 0.1 0.3 100 100 • 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 LND555 Figure 1 :Circuit for Astable Operation 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 •