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| 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 = +25C unless otherwise specified) Power Supply Voltage. VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Discharge Current (Pin7), I7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW Derate Above 25C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mW/C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260C Electrical Characteristics: (TA = +25C, VCC = 5V to 15V unless otherwise specified) Parameter Operating Supply Voltage Range Supply Current Symbol VCC ICC RL = , Low State, Note 2 VCC = 5V VCC = 15V Test Conditions Min 4.5 - - - - - VTH VT VR IR ITH Idis VCL VOL VCC = 5V VCC = 15V Output Voltage Low VCC = 5V VCC = 15V ISINK = 5mA ISINK = 10mA ISINK = 50mA ISINK = 100mA ISINK = 200mA Output Voltage High VOH VCC = 5V VCC = 15V Rise Time of Output Fall Time of Output tOLH tOHL ISOURCE = 100mA ISOURCE = 200mA Note 4 VCC = 5V VCC = 15V Reset Voltage Reset Current Threshold Current Discharge Leakage Current (Pin7) Control Voltage Level - - - 0.4 - - - 2.6 9.0 - - - - - 2.75 12.75 - - - Typ - 3.0 10 1.0 50 0.1 0.667 1.67 5.0 0.7 0.1 0.1 - 3.33 10 0.25 0.1 0.4 2.0 2.5 3.3 13.3 12.5 100 100 Max 16 6.0 15 - - - - - - 1.0 - 0.25 100 4.0 11 0.35 0.25 0.75 2.5 - - - - - - Unit V mA mA % ppm/C %/V x VCC V V V mA A nA V V V V V V V V V V ns ns Timing Error Initial Accuracy C = 0.1F Drift with Temperature Drift with Supply Voltage Threshold Voltage Trigger Voltage R = 1k to 100k, Note 3 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 = 20M. Pin Connection Diagram NTE955M, NTE955SM NTE955S (Front View) 8 VCC GND Trigger Output Reset 1 2 3 4 8 VCC 7 6 5 Discharge 5 Threshold 4 Control Voltage 3 2 1 Output Trigger GND Reset Control Voltage 7 6 Discharge Threshold NTE955M 8 5 NTE955SM .192 (4.9) .260 (6.6) 8 1 4 1 .390 (9.9) Max .155 (3.93) .300 (7.62) .050 (1.27) 016 (.406) 061 (1.53) .100 (2.54) .300 (7.62) NOTE: Pin1 on Beveled Edge .145 (3.68) .006 (.152) .198 (5.03) 4 5 .236 (5.99) .154 (3.91) NTE955S .768 (19.52) Max .118 (3.0) Max 1 8 .264 (6.72) Max .165 (4.2) Min .100 (2.54) Typ .700 (17.78) |
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