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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 +70°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Lead Temperature (During Soldering, 10sec Max), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260°C
Note 1. For operating at elevated temperaturesthe device must be derated based on a +150°C maxi-
mum junction temperature and a thermal resistance of +77°C/W for NTE978 and NTE978C
and +110°C/W for NTE978SM.

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Electrical Characteristics: (TA = +25°C, VCC = +5V to +15V, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Supply Voltage
Supply Current (Each Timer Section)
Timing Error, Monostable
Initial Accuracy
Drift with Temperature
Accuracy over Temperature
VCC
ICC Low State, VCC = 5V, RL =
Note 2
VCC = 15V, RL =
RA = 1k to 100k, C = 0.1µF,
Note 3
4.5 16
36
10 14
V
mA
mA
0.75
%
50 ppm/°C
1.5
%
Drift with Supply
0.1
%/V
Timing Error, Astable
Initial Accuracy
Drift with Temperature
Accuracy over Temperature
RA, RB = 1k to 100k, C = 0.1µF,
Note 3
2.25
%
150 ppm/°C
3.0
%
Drift with Supply
0.30
%/V
Trigger Voltage
Trigger Current
Reset Voltage
Reset Current
Threshold Current
Control Voltage Level and
Threshold Voltage
Pin1, Pin13 Leakage Output High
Pin1, Pin13 Saturation Output Low
Output Voltage Drop (Low)
Output Voltage Drop (High)
Rise Time of Output
Fall Time of Output
Matching Characteristics
Initial Timing Accuracy
Timing Druft with Temperature
VT
IT
VR
IR
ITH
VCL
VTH
Idis
VOL
VOH
tOLH
tOHL
VCC = 15V
VCC = 5V
4.5 5.0
1.25 1.67
0.2
Note 4
0.4 0.5
0.1
VTH = VControl, Note 5
VTH = 11.2V
VCC = 15V
VCC = 5V
0.03
––
9 10
2.6 3.33
1
Note 6
VCC = 15V
VCC = 5V
VCC = 15V
VCC = 5V
VCC = 15V, I = 15mA
VCC = 4.5V, I = 4.5mA
ISINK = 10mA
ISINK = 50mA
ISINK = 100mA
ISINK = 200mA
ISINK = 5mA
ISOURCE = 200mA
ISOURCE = 100mA
12.75
2.75
180
80
0.1
0.4
2.0
2.5
0.25
12.5
13.3
3.3
100
100
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
V
V
µA
V
mA
µA
nA
V
V
nA
mV
mV
V
V
V
V
V
V
V
V
ns
ns
Note 7
0.1 2.0
%
±10 ppm/°C
Drift with Supply Voltage
0.2 0.5 %/V

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Note 2. Supply current when output high typically 1mA less at VCC = 5V.
Note 3. Tested at VCC = 5V and VCC = 15V.
Note 4. As reset voltage lowers, timing is inhibited and then the output goes low.
Note 5. 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 dis-
sipation 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
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
14 8
17
.785 (19.95)
Max
.200 (5.08)
Max
.300
(7.62)
.100 (2.45)
.600 (15.24)
.099 (2.5) Min
NTE978SM
.340 (8.64)
14 8 .236
(5.99)
.154
1 7 (3.91)
.050 (1.27)
016
(.406)
061
(1.53)
.006 (.152)
.198 (5.03)
NOTE: Pin1 on Beveled Edge