NTE NTE955MC

NTE955MC
Integrated Circuit
CMOS Timing Circuit
Description:
The NTE955MC is a monolithic timing circuit in an 8–Lead DIP type package fabricated using CMOS
process. This timer is fully compatible with CMOS, TTL, and MOS logic and operates at frequencies
up to 2MHz. Because of its high impedance, this device uses smaller timing capacitors than those
used by the NE555. As a result, more accurate time delays and oscillations are possible. Power consumption is low across the full range of power supply voltage.
Like the NE555, the NTE955MC has a trigger level equal to approximately one–third of the supply
voltage and a threshold level equal to approximately two–thirds of the supply voltage. These levels
can be altered by use of the control voltage terminal (Pin5). When the trigger input (Pin2) falls below
the trigger level, the flip–flop is set and the output goes high. If Pin2 is above the trigger level and the
threshold input (Pin6) is above the threshold level, the flip–flop is reset and the output is low. The reset
input (Pin4) can override all other inputs and can be used to initiate a new timing cycle. If Pin4 is low,
the flip–flop is reset and the output is low. Whenever the output is low, a low–impedance path is provided between the discharge terminal (Pin7) and GND. All unused inputs should be tied to an appropriate logic level to prevent false triggering.
While the CMOS output is capable of sinking over 100mA and sourcing over 10mA, the NTE955MC
exhibits greatly reduced supply–current spikes during output transitions. This minimizes the need for
the large decoupling capacitors required by the NE555.
Features:
D Direct Replacement for 555 Timers
D Very Low Power Consumption: 1mW Typ at VDD = 5V
D Operates in Both Astable and Monostable Modes
D CMOS Output Capable of Swinging Rail to Rail
D High Output Current Capability:
Sink 100mA Typ
Source 10mA Typ
D Output Fully Compatible with CMOS, TTL, and MOS
D Low Supply Current Reduces Spikes During Output Transitions
D Single Supply Operation from 2V to 15V
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, Note 1 unless otherwise specified)
Power Supply Voltage (Note 2), VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Input Voltage Range (Any Input), VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 to VDD
Sink Current, Discharge or Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150mA
Source Current, Output, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA
Continuous Total Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8mW/°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
Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only and functional operation of the device
at these or any other conditions beyond those indicated under “Recommended Operating
Conditions” is not implied. Exposure to absolute–maximum–rated conditions for extended
periods may affect device reliability.
Note 2. All voltage values are with respect to network GND.
Recommended Operating Conditions:
Parameter
Supply Voltage
Operating Ambient Temperature Range
Symbol
Test Conditions
Min
Typ
Max
Unit
VDD
2
–
15
V
TA
0
–
70
°C
Min
Typ
Max
Unit
0.95
1.33
1.65
V
0.85
–
1.75
V
–
10
–
pA
–
75
–
pA
0.4
0.67
0.95
V
0.3
–
1.05
V
–
10
–
pA
–
75
–
pA
0.4
1.1
1.5
V
0.3
–
2.0
V
–
10
–
pA
–
75
–
pA
Electrical Characteristics: (TA = +25°C, VDD = 2V unless otherwise specified)
Parameter
Threshold Voltage
Symbol
Test Conditions
VTH
TA = 0° to +70°C
Threshold Current
ITH
TA = 0° to +70°C
Trigger Voltage
VT
TA = 0° to +70°C
Trigger Current
IT
TA = 0° to +70°C
Reset Voltage
VR
TA = 0° to +70°C
Reset Current
IR
TA = 0° to +70°C
Control Voltage (Open Circuit) as a
Percentage of Supply Voltage
TA = 0° to +70°C
Discharge Switch On–State Voltage
IOL = 1mA
66.7%
TA = 0° to +70°C
Discharge Switch Off–State Current
TA = 0° to +70°C
High–Level Output Voltage
VOH
IOH = –300µA
TA = 0° to +70°C
Low–Level Output Voltage
VOL
IOL = 1mA
TA = 0° to +70°C
Supply Current
IDD
Note 3
TA = 0° to +70°C
–
0.03
0.2
V
–
–
0.25
V
–
0.1
–
nA
–
0.5
–
nA
1.5
1.9
–
V
1.5
–
–
V
–
0.07
0.3
V
–
–
0.35
V
–
–
250
µA
–
–
400
µA
Note 3. These values apply for the expected operating configurations in which Pin6 is connected
directly to Pin7 or Pin2.
Electrical Characteristics: (TA = +25°C, VDD = 5V unless otherwise specified)
Parameter
Symbol
Threshold Voltage
VTH
Threshold Current
ITH
Test Conditions
TA = 0° to +70°C
TA = 0° to +70°C
Trigger Voltage
VT
TA = 0° to +70°C
Trigger Current
IT
TA = 0° to +70°C
Reset Voltage
VR
TA = 0° to +70°C
Reset Current
IR
TA = 0° to +70°C
Control Voltage (Open Circuit) as a
Percentage of Supply Voltage
TA = 0° to +70°C
Discharge Switch On–State Voltage
IOL = 10mA
Discharge Switch Off–State Current
TA = 0° to +70°C
VOH
IOH = –1mA
TA = 0° to +70°C
Low–Level Output Voltage
VOL
IOL = 8mA
TA = 0° to +70°C
IOL = 5mA
TA = 0° to +70°C
IOL = 3.2mA
TA = 0° to +70°C
Supply Current
IDD
Typ
Max
Unit
2.8
3.3
3.8
V
2.7
–
3.9
V
–
10
–
pA
–
75
–
pA
1.36
1.66
1.96
V
1.26
–
2.06
V
–
10
–
pA
–
75
–
pA
0.4
1.1
1.5
V
0.3
–
1.8
V
–
10
–
pA
–
75
–
pA
66.7%
TA = 0° to +70°C
High–Level Output Voltage
Min
Note 3
TA = 0° to +70°C
–
0.14
0.5
V
–
–
0.6
V
–
0.1
–
nA
–
0.5
–
nA
4.1
4.8
–
V
4.1
–
–
V
–
0.21
0.4
V
–
–
0.5
V
–
0.13
0.3
V
–
–
0.4
V
–
0.08
0.3
V
–
–
0.35
V
–
170
350
µA
–
–
500
µA
Note 3. These values apply for the expected operating configurations in which Pin6 is connected
directly to Pin7 or Pin2.
Electrical Characteristics: (TA = +25°C, VDD = 15V unless otherwise specified)
Parameter
Threshold Voltage
Symbol
Test Conditions
VTH
TA = 0° to +70°C
Threshold Current
ITH
TA = 0° to +70°C
Trigger Voltage
VT
TA = 0° to +70°C
Trigger Current
IT
TA = 0° to +70°C
Reset Voltage
VR
TA = 0° to +70°C
Min
Typ
Max
Unit
9.45
10.0
10.55
V
9.35
–
10.65
V
–
10
–
pA
–
75
–
pA
4.65
5.0
5.35
V
4.55
–
5.45
V
–
10
–
pA
–
75
–
pA
0.4
1.1
1.5
V
0.3
–
1.8
V
Electrical Characteristics (Cont’d): (TA = +25°C, VDD = 15V unless otherwise specified)
Parameter
Reset Current
Symbol
Test Conditions
IR
TA = 0° to +70°C
Control Voltage (Open Circuit) as a
Percentage of Supply Voltage
TA = 0° to +70°C
Discharge Switch On–State Voltage
IOL = 100mA
Discharge Switch Off–State Current
TA = 0° to +70°C
VOH
IOH = –10mA
TA = 0° to +70°C
IOH = –5mA
TA = 0° to +70°C
IOH = –1mA
TA = 0° to +70°C
Low–Level Output Voltage
VOL
IOL = 100mA
TA = 0° to +70°C
IOL = 50mA
TA = 0° to +70°C
IOL = 10mA
TA = 0° to +70°C
Supply Current
IDD
Typ
Max
Unit
–
10
–
pA
–
75
–
pA
66.7%
TA = 0° to +70°C
High–Level Output Voltage
Min
Note 3
TA = 0° to +70°C
–
0.77
1.7
V
–
–
1.8
V
–
0.1
–
nA
–
0.5
–
nA
12.5
14.2
–
V
12.5
–
–
V
13.5
14.6
–
V
13.5
–
–
V
14.2
14.9
–
V
14.2
–
–
V
–
1.28
3.2
V
–
–
3.8
V
–
0.63
1.0
V
–
–
1.3
V
–
0.12
0.3
V
–
–
0.4
V
–
360
600
µA
–
–
800
µA
Note 3. These values apply for the expected operating configurations in which Pin6 is connected
directly to Pin7 or Pin2.
Operating Characteristics: (TA = +25°C, VDD = 5V unless otherwise specified)
Parameter
Symbol
Initial Error of Timing Interval (Note 4)
Supply Voltage Sensitivity of
Timing Interval
Output Pulse Rise Time
tr
Output Pulse Fall Time
tf
Maximum Frequency in Astable Mode
fmax
Test Conditions
Min
Typ
Max
VDD = 5V to 15V, CT = 0.1µF,
RA = RB = 1kΩ
Ω to 100kΩ
Ω
–
1%
3%
–
0.1
0.5
%/V
RL = 10MΩ, CL = 10pF
–
20
75
ns
–
15
60
ns
1.2
2.1
–
MHz
RA = 470Ω, RB = 200Ω,
CT = 200pF
Unit
Note 4. Timing interval error is defined as the difference between the measured value and the
average value of a random sample from each process run.
Electrical Characteristics: (TA = +25°C, VDD = 5V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Threshold Voltage
VTH
2.8
3.3
3.8
V
Threshold Current
ITH
–
10
–
pA
Trigger Voltage
VT
1.36
1.66
1.96
V
Trigger Current
IT
–
10
–
pA
Reset Voltage
VR
0.4
1.1
1.5
V
Reset Current
IR
–
10
–
pA
Electrical Characteristics (Cont’d): (TA = +25°C, VDD = 5V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Control Voltage (Open Circuit) as a
Percentage of Supply Voltage
Typ
Max
Unit
66.7%
Discharge Switch On–State Voltage
IOL = 10mA
–
0.14
0.5
V
–
0.1
–
nA
4.1
4.8
–
V
Discharge Switch Off–State Current
High–Level Output Voltage
VOH
IOH = –1mA
Low–Level Output Voltage
VOL
IOL = 8mA
–
0.21
0.4
V
IOL = 5mA
–
0.13
0.3
V
IOL = 3.2mA
–
0.06
0.3
V
Note 3
–
170
350
µA
Supply Current
IDD
Note 3. These values apply for the expected operating configurations in which Pin6 is connected
directly to Pin7 or Pin2.
Function Table:
Threshold Voltage
Trigger Voltage
Reset Voltage
Output
Discharge Switch
Don’t Care
Don’t Care
< MIN
Low
On
Don’t Care
< MIN
> MAX
High
Off
> MAX
> MAX
> MAX
Low
On
< MIN
> MAX
> MAX
As previously established
Note 5. For conditions shown as MIN or MAX, use the appropriate value specified under electrical
characteristics.
Pin Connection Diagram
GND 1
8 VCC
Trigger 2
7 Discharge
Output 3
6 Threshold
Reset 4
8
5 Control Voltage
5
.256 (6.52) Max
1
4
.393 (10.0)
Max
.300 (7.62)
.150
(3.81)
.100 (2.54)
.070 (1.77) Min
.300 (7.62)