NTE955M

NTE955M NTE955S NTE955SM Integrated Circuit Timing Circuit Description: The NTE955 series timing circuit is a highly stable controller capable of producing accurate time delays, or oscillation. Additional terminals are provided for triggering or resetting if desired. In time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200mA or drive TTL circuits. Features: D Direct Replacement for 555 Timers D Timing from Microseconds through Hours D Operates in Both Astable and Monostable Modes D Adjustable Duty Cycle D High Current Output Can Source or Sink 200mA D Output and Supply TTL Compatible TTL D Temperature Stability of 0.005% per °C D Normally “ON” or Normally “OFF” Output D Available in Three Types: NTE955M – 8–Lead DIP NTE955S – 8–Lead SIP NTE955SM – SOIC–8 (Surface Mount) Applications: D Precision Timing D Pulse Generation D Sequential Timing D Time Delay Generation D Pulse Width Modulation D Pulse Position Modulation D Linear Ramp Generator Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Power Supply Voltage. VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Discharge Current (Pin7), I7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mW/°C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260°C Electrical Characteristics: (TA = +25°C, VCC = 5V to 15V unless otherwise specified) Parameter Symbol Min Typ Max Unit 4.5 – 16 V VCC = 5V – 3.0 6.0 mA VCC = 15V – 10 15 mA – 1.0 – % Drift with Temperature – 50 – ppm/°C Drift with Supply Voltage – 0.1 – %/V – 0.667 – x VCC VCC = 5V – 1.67 – V VCC = 15V – 5.0 – V Operating Supply Voltage Range VCC Supply Current ICC Timing Error Initial Accuracy C = 0.1µF Test Conditions RL = ∞, Low State, Note 2 R = 1kΩ to 100kΩ, Note 3 Threshold Voltage VTH Trigger Voltage VT Reset Voltage VR 0.4 0.7 1.0 V Reset Current IR – 0.1 – mA Threshold Current ITH – 0.1 0.25 µA Discharge Leakage Current (Pin7) Idis – – 100 nA Control Voltage Level VCL VCC = 5V 2.6 3.33 4.0 V VCC = 15V 9.0 10 11 V Output Voltage Low Output Voltage High VOL VOH Note 4 VCC = 5V ISINK = 5mA – 0.25 0.35 V VCC = 15V ISINK = 10mA – 0.1 0.25 V ISINK = 50mA – 0.4 0.75 V ISINK = 100mA – 2.0 2.5 V ISINK = 200mA – 2.5 – V 2.75 3.3 – V ISOURCE = 100mA 12.75 13.3 – V ISOURCE = 200mA – 12.5 – V VCC = 5V VCC = 15V Rise Time of Output tOLH – 100 – ns Fall Time of Output tOHL – 100 – ns Note 2. Supply current when output is high is typically 1mA less. Note 3. Tested at VCC = 5V and VCC = 15V. Monostable mode. Note 4. This will determine the maximum value of RA = RB for 15V operation. The maximum total R = 20MΩ. Pin Connection Diagram NTE955M, NTE955SM NTE955S (Front View) 8 VCC GND 1 8 VCC Trigger 2 7 Discharge Output 3 6 Threshold Reset 4 5 Discharge 6 Threshold 5 Control Voltage 4 Reset 3 Output 2 Trigger 1 GND Control Voltage NTE955M 8 7 NTE955SM 5 .192 (4.9) .260 (6.6) 1 8 5 1 4 4 .390 (9.9) Max .236 (5.99) .154 (3.91) .300 (7.62) .155 (3.93) .050 (1.27) 016 (.406) 061 (1.53) .100 (2.54) .145 (3.68) .006 (.152) .300 (7.62) NOTE: Pin1 on Beveled Edge NTE955S .768 (19.52) Max 1 .118 (3.0) Max 8 .264 (6.72) Max .165 (4.2) Min .100 (2.54) Typ .700 (17.78) .198 (5.03)