NTE955M NTE955S NTE955SM Integrated Circuit Timing Circuit Description: The NTE955 series timing circuit is a highly stable controller capable of producing accurate time de- lays, 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 wave- forms, and the output structure can source or sink up to 200mA or drive TTL circuits. Features: Direct Replacement for 555 Timers Timing from Microseconds through Hours Operates in Both Astable and Monostable Modes Adjustable Duty Cycle High Current Output Can Source or Sink 200mA Output and Supply TTL Compatible TTL Temperature Stability of 0.005% per C Normally ON or Normally OFF Output Available in Three Types: NTE955M 8Lead DIP NTE955S 8Lead SIP NTE955SM SOIC8 (Surface Mount) Applications: Precision Timing Pulse Generation Sequential Timing Time Delay Generation Pulse Width Modulation Pulse Position Modulation Linear Ramp GeneratorAbsolute Maximum Ratings: (T = +25C unless otherwise specified) A Power Supply Voltage. V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V CC Discharge Current (Pin7), I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA 7 Power Dissipation, P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW D Derate Above 25C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mW/C Operating Temperature Range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C A Storage Temperature Range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to +150C stg Lead Temperature (During Soldering, 10sec), T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260C L Electrical Characteristics: (T = +25C, V = 5V to 15V unless otherwise specified) A CC Parameter Symbol Test Conditions Min Typ Max Unit Operating Supply Voltage Range V 4.5 16 V CC V = 5V 3.0 6.0 mA Supply Current I R = , CC CC L Low State, V = 15V 10 15 mA CC Note 2 Timing Error R = 1k to 100k , Note 3 Initial Accuracy C = 0.1 F 1.0 % Drift with Temperature 50 ppm/C Drift with Supply Voltage 0.1 %/V Threshold Voltage V 0.667 x V TH CC Trigger Voltage V V = 5V 1.67 V T CC V = 15V 5.0 V CC Reset Voltage V 0.4 0.7 1.0 V R Reset Current I 0.1 mA R Threshold Current I Note 4 0.1 0.25 A TH Discharge Leakage Current (Pin7) I 100 nA dis Control Voltage Level V V = 5V 2.6 3.33 4.0 V CL CC V = 15V 9.0 10 11 V CC Output Voltage Low V V = 5V I = 5mA 0.25 0.35 V OL CC SINK V = 15V I = 10mA 0.1 0.25 V CC SINK I = 50mA 0.4 0.75 V SINK I = 100mA 2.0 2.5 V SINK I = 200mA 2.5 V SINK Output Voltage High V V = 5V 2.75 3.3 V OH CC V = 15V I = 100mA 12.75 13.3 V CC SOURCE I = 200mA 12.5 V SOURCE Rise Time of Output t 100 ns OLH Fall Time of Output t 100 ns OHL Note 2. Supply current when output is high is typically 1mA less. Note 3. Tested at V = 5V and V = 15V. Monostable mode. CC CC Note 4. This will determine the maximum value of R = R for 15V operation. The maximum total A B R = 20M .