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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 = +25C, 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 25C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8mW/C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260C 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 Parameter Threshold Voltage Threshold Current Trigger Voltage Trigger Current Reset Voltage Reset Current Control Voltage (Open Circuit) as a Percentage of Supply Voltage Discharge Switch On-State Voltage Discharge Switch Off-State Current TA = 0 to +70C High-Level Output Voltage Low-Level Output Voltage Supply Current VOH VOL IDD IOH = -300A TA = 0 to +70C IOL = 1mA TA = 0 to +70C Note 3 TA = 0 to +70C Symbol VDD TA Symbol VTH TA = 0 to +70C ITH TA = 0 to +70C VT TA = 0 to +70C IT TA = 0 to +70C VR TA = 0 to +70C IR TA = 0 to +70C TA = 0 to +70C IOL = 1mA TA = 0 to +70C - - - - 1.5 1.5 - - - - Test Conditions Test Conditions Min 2 0 Min 0.95 0.85 - - 0.4 0.3 - - 0.4 0.3 - - Typ - - Typ 1.33 - 10 75 0.67 - 10 75 1.1 - 10 75 66.7% 0.03 - 0.1 0.5 1.9 - 0.07 - - - 0.2 0.25 - - - - 0.3 0.35 250 400 V V nA nA V V V V A A Max 15 70 Max 1.65 1.75 - - 0.95 1.05 - - 1.5 2.0 - - Unit V C Unit V V pA pA V V pA pA V V pA pA
Electrical Characteristics: (TA = +25C, VDD = 2V unless otherwise specified)
Note 3. These values apply for the expected operating configurations in which Pin6 is connected directly to Pin7 or Pin2.
Electrical Characteristics: (TA = +25C, VDD = 5V unless otherwise specified)
Parameter Threshold Voltage Threshold Current Trigger Voltage Trigger Current Reset Voltage Reset Current Control Voltage (Open Circuit) as a Percentage of Supply Voltage Discharge Switch On-State Voltage Discharge Switch Off-State Current TA = 0 to +70C High-Level Output Voltage Low-Level Output Voltage VOH VOL IOH = -1mA TA = 0 to +70C IOL = 8mA TA = 0 to +70C IOL = 5mA TA = 0 to +70C IOL = 3.2mA TA = 0 to +70C Supply Current IDD Note 3 TA = 0 to +70C Symbol VTH TA = 0 to +70C ITH TA = 0 to +70C VT TA = 0 to +70C IT TA = 0 to +70C VR TA = 0 to +70C IR TA = 0 to +70C TA = 0 to +70C IOL = 10mA TA = 0 to +70C - - - - 4.1 4.1 - - - - - - - - Test Conditions Min 2.8 2.7 - - 1.36 1.26 - - 0.4 0.3 - - Typ 3.3 - 10 75 1.66 - 10 75 1.1 - 10 75 66.7% 0.14 - 0.1 0.5 4.8 - 0.21 - 0.13 - 0.08 - 170 - 0.5 0.6 - - - - 0.4 0.5 0.3 0.4 0.3 0.35 350 500 V V nA nA V V V V V V V V A A Max 3.8 3.9 - - 1.96 2.06 - - 1.5 1.8 - - Unit V V pA pA V V pA pA V V pA pA
Note 3. These values apply for the expected operating configurations in which Pin6 is connected directly to Pin7 or Pin2. Electrical Characteristics: (TA = +25C, VDD = 15V unless otherwise specified)
Parameter Threshold Voltage Threshold Current Trigger Voltage Trigger Current Reset Voltage Symbol VTH TA = 0 to +70C ITH TA = 0 to +70C VT TA = 0 to +70C IT TA = 0 to +70C VR TA = 0 to +70C Test Conditions Min 9.45 9.35 - - 4.65 4.55 - - 0.4 0.3 Typ 10.0 - 10 75 5.0 - 10 75 1.1 - Max 10.55 10.65 - - 5.35 5.45 - - 1.5 1.8 Unit V V pA pA V V pA pA V V
Electrical Characteristics (Cont'd): (TA = +25C, VDD = 15V unless otherwise specified)
Parameter Reset Current Control Voltage (Open Circuit) as a Percentage of Supply Voltage Discharge Switch On-State Voltage Discharge Switch Off-State Current TA = 0 to +70C High-Level Output Voltage VOH IOH = -10mA TA = 0 to +70C IOH = -5mA TA = 0 to +70C IOH = -1mA TA = 0 to +70C Low-Level Output Voltage VOL IOL = 100mA TA = 0 to +70C IOL = 50mA TA = 0 to +70C IOL = 10mA TA = 0 to +70C Supply Current IDD Note 3 TA = 0 to +70C Symbol IR TA = 0 to +70C TA = 0 to +70C IOL = 100mA TA = 0 to +70C - - - - 12.5 12.5 13.5 13.5 14.2 14.2 - - - - - - - - Test Conditions Min - - Typ 10 75 66.7% 0.77 - 0.1 0.5 14.2 - 14.6 - 14.9 - 1.28 - 0.63 - 0.12 - 360 - 1.7 1.8 - - - - - - - - 3.2 3.8 1.0 1.3 0.3 0.4 600 800 V V nA nA V V V V V V V V V V V V A A Max - - Unit pA pA
Note 3. These values apply for the expected operating configurations in which Pin6 is connected directly to Pin7 or Pin2. Operating Characteristics: (TA = +25C, VDD = 5V unless otherwise specified)
Parameter Initial Error of Timing Interval (Note 4) Supply Voltage Sensitivity of Timing Interval Output Pulse Rise Time Output Pulse Fall Time Maximum Frequency in Astable Mode tr tf fmax RA = 470, RB = 200, CT = 200pF Symbol Test Conditions VDD = 5V to 15V, CT = 0.1F, RA = RB = 1k to 100k RL = 10M, CL = 10pF Min - - - - 1.2 Typ 1% 0.1 20 15 2.1 Max 3% 0.5 75 60 - %/V ns ns MHz 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 = +25C, VDD = 5V unless otherwise specified)
Parameter Threshold Voltage Threshold Current Trigger Voltage Trigger Current Reset Voltage Reset Current Symbol VTH ITH VT IT VR IR Test Conditions Min 2.8 - 1.36 - 0.4 - Typ 3.3 10 1.66 10 1.1 10 Max 3.8 - 1.96 - 1.5 - Unit V pA V pA V pA
Electrical Characteristics (Cont'd): (TA = +25C, VDD = 5V unless otherwise specified)
Parameter Control Voltage (Open Circuit) as a Percentage of Supply Voltage Discharge Switch On-State Voltage Discharge Switch Off-State Current High-Level Output Voltage Low-Level Output Voltage VOH VOL IOH = -1mA IOL = 8mA IOL = 5mA IOL = 3.2mA Supply Current IDD Note 3 IOL = 10mA - - 4.1 - - - - Symbol Test Conditions Min Typ 66.7% 0.14 0.1 4.8 0.21 0.13 0.06 170 0.5 - - 0.4 0.3 0.3 350 V nA V V V V A Max Unit
Note 3. These values apply for the expected operating configurations in which Pin6 is connected directly to Pin7 or Pin2. Function Table:
Threshold Voltage Don't Care Don't Care > MAX < MIN Trigger Voltage Don't Care < MIN > MAX > MAX Reset Voltage < MIN > MAX > MAX > MAX Output Low High Low Discharge Switch On Off On
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 Trigger 2 Output 3 Reset 4
8 5
8 VCC 7 Discharge 6 Threshold 5 Control Voltage
.256 (6.52) Max
1
4
.393 (10.0) Max .150 (3.81)
.300 (7.62)
.100 (2.54) .300 (7.62)
.070 (1.77) Min

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