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NTE978/NTE978C/NTE978SM Integrated Circuit Dual Timer
Description: The NTE978 series dual timing circuit is a highly stable controller capable of producing accurate time delays or oscillation. The NTE978 is a dual NTE955. Timing is provided by an external resistor and capacitor for each timing function. The two timers operate independently of each other sharing only VCC and GND. The circuits may be triggered and reset on falling waveforms. The output structures may sink or source 200mA. Features: D Direct Replacement for 556 Timers D Replaces Two 555 Timers D Timing from Microseconds through Hours D Operates in both Astable and Monostable Modes D Adjustable Duty Cycle D Output can Source or Sink 200mA D Output and Supply TTL Compatible D Temperature Stability better than 0.005% per C D Normally On and Normally Off Output D Available in Three Types: NTE978 14-Lead DIP NTE978C 14-Lead DIP (CMOS) NTE978SM SOIC-14 (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: Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V Power Dissipation (Note 1), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1620mW Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 10sec Max), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260C Note 1. For operating at elevated temperaturesthe device must be derated based on a +150C maximum junction temperature and a thermal resistance of +77C/W for NTE978 and NTE978C and +110C/W for NTE978SM.
Electrical Characteristics: (TA = +25C, VCC = +5V to +15V, unless otherwise specified)
Parameter Supply Voltage Supply Current (Each Timer Section) Symbol VCC ICC Low State, Note 2 VCC = 5V, RL = VCC = 15V, RL = Test Conditions Min 4.5 - - - RA = 1k to 100k, C = 0.1F, Note 3 - - - - RA, RB = 1k to 100k, C = 0.1F, Note 3 - - - VT IT VR IR ITH VCL VTH Idis Note 6 VCC = 15V, I = 15mA VCC = 4.5V, I = 4.5mA Output Voltage Drop (Low) VOL VCC = 15V ISINK = 10mA ISINK = 50mA ISINK = 100mA ISINK = 200mA VCC = 5V Output Voltage Drop (High) VOH VCC = 15V VCC = 5V Rise Time of Output Fall Time of Output Matching Characteristics Initial Timing Accuracy Timing Druft with Temperature Drift with Supply Voltage Note 7 tOLH tOHL ISINK = 5mA ISOURCE = 200mA ISOURCE = 100mA VTH = V-Control, Note 5 VTH = 11.2V Control Voltage Level and Threshold Voltage Pin1, Pin13 Leakage Output High Pin1, Pin13 Saturation Output Low VCC = 15V VCC = 5V Note 4 VCC = 15V VCC = 5V Trigger Current Reset Voltage Reset Current Threshold Current 4.5 1.25 - 0.4 - - - 9 2.6 - - - - - - - - - 12.75 2.75 - - - - - Typ - 3 10 0.75 50 1.5 0.1 2.25 150 3.0 0.30 5.0 1.67 0.2 0.5 0.1 0.03 - 10 3.33 1 180 80 0.1 0.4 2.0 2.5 0.25 12.5 13.3 3.3 100 100 0.1 10 0.2 Max 16 6 14 - - - - - - - - 5.5 2.0 1.0 1.0 0.6 0.1 250 11 4.0 100 300 200 0.25 0.75 2.75 - 0.35 - - - - - 2.0 - 0.5 Unit V mA mA % ppm/C % %/V % ppm/C % %/V V V A V mA A nA V V nA mV mV V V V V V V V V ns ns % ppm/C %/V
Timing Error, Monostable Initial Accuracy Drift with Temperature Accuracy over Temperature Drift with Supply Timing Error, Astable Initial Accuracy Drift with Temperature Accuracy over Temperature Drift with Supply Trigger Voltage
Supply current when output high typically 1mA less at VCC = 5V. Tested at VCC = 5V and VCC = 15V. As reset voltage lowers, timing is inhibited and then the output goes low. This will determine the maximum value of RA + RB for 15V operation. The maximum total (RA + RB) is 20M. Note 6. No protection against excessive Pin1, Pin13 current is necessary providing the package dissipation rating will not be exceeded. Note 7. Matching characteristics refer to, the difference between performance characteristics of each timer section.
Pin Connection Diagram NTE978, NTE978C
Note Note Note Note
2. 3. 4. 5.
14
8
Discharge 1 Threshold 2 Control Voltage 3 Reset 4 Output 5 Trigger 6 GND 7
14 VCC 13 Discharge 12 Threshold 11 Control Voltage 10 Reset 9 Output 8 Trigger
.100 (2.45) .600 (15.24) .099 (2.5) Min .785 (19.95) Max .200 (5.08) Max .300 (7.62) 1 7
NTE978SM .340 (8.64)
14
8
1
7
.236 (5.99) .154 (3.91)
.050 (1.27)
016 (.406) 061 (1.53) .006 (.152)
.198 (5.03)
NOTE: Pin1 on Beveled Edge

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