NTE NTE955S

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