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:
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 8Lead DIP
NTE955S
8Lead SIP
NTE955SM SOIC8 (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: (T
A
= +25
C unless otherwise specified)
Power Supply Voltage. V
CC
18V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Discharge Current (Pin7), I
7
200mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation, P
D
625mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate Above 25
C
5mW/
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
A
0
to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering, 10sec), T
L
+260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (T
A
= +25
C, V
CC
= 5V to 15V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Operating Supply Voltage Range
V
CC
4.5
16
V
Supply Current
I
CC
R
L
=
,
V
CC
= 5V
3.0
6.0
mA
Low State,
Note 2
V
CC
= 15V
10
15
mA
Timing Error
Initial Accuracy C = 0.1
F
R = 1k
to 100k
, Note 3
1.0
%
Drift with Temperature
50
ppm/
C
Drift with Supply Voltage
0.1
%/V
Threshold Voltage
V
TH
0.667
x V
CC
Trigger Voltage
V
T
V
CC
= 5V
1.67
V
V
CC
= 15V
5.0
V
Reset Voltage
V
R
0.4
0.7
1.0
V
Reset Current
I
R
0.1
mA
Threshold Current
I
TH
Note 4
0.1
0.25
A
Discharge Leakage Current (Pin7)
I
dis
100
nA
Control Voltage Level
V
CL
V
CC
= 5V
2.6
3.33
4.0
V
V
CC
= 15V
9.0
10
11
V
Output Voltage Low
V
OL
V
CC
= 5V
I
SINK
= 5mA
0.25
0.35
V
V
CC
= 15V
I
SINK
= 10mA
0.1
0.25
V
I
SINK
= 50mA
0.4
0.75
V
I
SINK
= 100mA
2.0
2.5
V
I
SINK
= 200mA
2.5
V
Output Voltage High
V
OH
V
CC
= 5V
2.75
3.3
V
V
CC
= 15V
I
SOURCE
= 100mA
12.75
13.3
V
I
SOURCE
= 200mA
12.5
V
Rise Time of Output
t
OLH
100
ns
Fall Time of Output
t
OHL
100
ns
Note 2. Supply current when output is high is typically 1mA less.
Note 3. Tested at V
CC
= 5V and V
CC
= 15V. Monostable mode.
Note 4. This will determine the maximum value of R
A
= R
B
for 15V operation. The maximum total
R = 20M
.
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