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74VHC163 4-Bit Binary Counter with Synchronous Clear
74VHC163 4-Bit Binary Counter with Synchronous Clear

... delays of the intermediate stages, plus the CET to CP setup time of the last stage. This total delay plus setup time sets the upper limit on clock frequency. For faster clock rates, the carry lookahead connections shown in Figure 2 are recommended. In this scheme the ripple delay through the interme ...
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... all CMOS devices. Do not exceed the absolute maximum ratings because stresses beyond the listed ratings can cause permanent damage to the devices. Always sequence V+ on first, followed by V- and logic inputs. If power-supply sequencing is not possible, add two small, external signal diodes in series ...
Data interface - STMicroelectronics
Data interface - STMicroelectronics

... output slopes for low EMI, a wide power supply voltage range and a real standby function with zero power consumption ISSB typ 1µA during system de powering VCC  0.5V make this device high efficient for automotive bus system. After wake up of the system from SB condition the first output signal wi ...
DC2431A - Linear Technology
DC2431A - Linear Technology

... Demonstration circuit 2431A is a 4-switch synchronous buck-boost regulator that demonstrates the high power capability of  the LT®8390. The output is 12V and the maximum output current is 25A for up to 300W power delivery. The switching frequency is 150kHz and efficiency can go higher than 98%. The ...
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Digital Logic

Transmission Line Proposals & Constraints 10 September 2001
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... • The negatively charges on the bottom of the cloud repel electrons on the surface of the Earth, leaving the ground positively charged just below the cloud. • The strong attraction between the negative cloud and the positive ground pull electrons off atoms and molecules in the air. ...
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... Resistance is NOT Futile! Electrons are not “completely free to move” in a conductor. They move erratically, colliding with the nuclei all the time: this is what we call “resistance”. The mechanical analog is FRICTION. The resistance is related to the potential we need to apply to a device to drive ...
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Effects of Current on the Human Body Section 2 2

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Introduction_to_Voltage_Pulsers__1_

... resistance. In DC terms, the output current equals the amplitude of the high voltage supply, less the forward voltage drop of the laser diode and the drop across the MOSFET, divided by the fixed resistance on the board. Such a design seems simple on the surface, but in reality the components must be ...
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View course syllabus - Cleveland Institute of Electronics

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Fly - rod Accessory Pack

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ADD8754-EVAL Evaluation Kit for LCD Power

FSTD3125 — 4-Bit Bus Switch with Level Shifting Features Description 
FSTD3125 — 4-Bit Bus Switch with Level Shifting Features Description 

... Description ...
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Resistive opto-isolator



Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.
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