NTE NTE978

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 maximum junction temperature and a thermal resistance of +77°C/W for NTE978 and NTE978C
and +110°C/W for NTE978SM.
Electrical Characteristics: (TA = +25°C, VCC = +5V to +15V, unless otherwise specified)
Parameter
Symbol
Supply Voltage
VCC
Supply Current (Each Timer Section)
ICC
Test Conditions
Min
Typ
Max
Unit
4.5
–
16
V
VCC = 5V, RL = ∞
–
3
6
mA
VCC = 15V, RL = ∞
–
10
14
mA
–
0.75
–
%
–
50
–
ppm/°C
–
1.5
–
%
–
0.1
–
%/V
–
2.25
–
%
–
150
–
ppm/°C
–
3.0
–
%
–
0.30
–
%/V
VCC = 15V
4.5
5.0
5.5
V
VCC = 5V
1.25
1.67
2.0
V
–
0.2
1.0
µA
0.4
0.5
1.0
V
–
0.1
0.6
mA
VTH = V–Control, Note 5
–
0.03
0.1
µA
VTH = 11.2V
–
–
250
nA
VCC = 15V
9
10
11
V
VCC = 5V
2.6
3.33
4.0
V
–
1
100
nA
VCC = 15V, I = 15mA
–
180
300
mV
VCC = 4.5V, I = 4.5mA
–
80
200
mV
ISINK = 10mA
–
0.1
0.25
V
ISINK = 50mA
–
0.4
0.75
V
ISINK = 100mA
–
2.0
2.75
V
ISINK = 200mA
–
2.5
–
V
VCC = 5V
ISINK = 5mA
–
0.25
0.35
V
VCC = 15V
ISOURCE = 200mA
–
12.5
–
V
ISOURCE = 100mA
12.75
13.3
–
V
2.75
3.3
–
V
Low State,
Note 2
Timing Error, Monostable
Initial Accuracy
RA = 1k to 100kΩ, C = 0.1µF,
Note 3
Drift with Temperature
Accuracy over Temperature
Drift with Supply
Timing Error, Astable
Initial Accuracy
RA, RB = 1k to 100kΩ, C = 0.1µF,
Note 3
Drift with Temperature
Accuracy over Temperature
Drift with Supply
Trigger Voltage
VT
Trigger Current
IT
Reset Voltage
VR
Reset Current
IR
Threshold Current
ITH
Control Voltage Level and
Threshold Voltage
VCL
VTH
Pin1, Pin13 Leakage Output High
Idis
Pin1, Pin13 Saturation Output Low
Output Voltage Drop (Low)
Output Voltage Drop (High)
Note 4
Note 6
VOL
VOH
VCC = 15V
VCC = 5V
Rise Time of Output
tOLH
–
100
–
ns
Fall Time of Output
tOHL
–
100
–
ns
–
0.1
2.0
%
–
±10
–
ppm/°C
–
0.2
0.5
%/V
Matching Characteristics
Initial Timing Accuracy
Timing Druft with Temperature
Drift with Supply Voltage
Note 7
Note
Note
Note
Note
2.
3.
4.
5.
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 20MΩ.
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.
NTE978, NTE978C
Pin Connection Diagram
Discharge 1
14 VCC
Threshold 2
13 Discharge
Control Voltage 3
12 Threshold
Reset 4
14
8
1
7
11 Control Voltage
Output 5
10 Reset
Trigger 6
9 Output
GND 7
8 Trigger
.785 (19.95)
Max
.300
(7.62)
.200 (5.08)
Max
.100 (2.45)
.099 (2.5) Min
.600 (15.24)
NTE978SM
.340 (8.64)
14
8
1
7
.236
(5.99)
.154
(3.91)
.050 (1.27)
016
(.406)
.198 (5.03)
061
(1.53)
.006 (.152)
NOTE: Pin1 on Beveled Edge