The datasheet collection for the ICs of the CMOS series. Watch now! CMOS – Dual adjustable Schmitt trigger. Choose by . CMOS IC Use of. This dual Schmitt-trigger inverter is designed for An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in. The data sheet for the MCB indicates the minimum input voltage The best match for IC1 that I found is a Dual Schmitt Trigger, TCBP or NTEB .

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Figure 1 is the front-end of a simple frequency counter, 1 Hz to 1 MHz. Pin 4 of IC1 feeds the input of a CD Q1 is a 2N and IC5A is a I found two conflicting datasheets on this. Please log in to post an answer. Dahasheet using the resistance and capacitance values for the IC5A timer IC we get one-shot periods between 0. The trimmers would adjust these to 1. I believe the switch labels Hz and kHz in the schematic diagram got swapped.

The 1-sec period would let the counters count 0 to pulses kHz and the 1 msec period would open the counters to count from 0 to kHz MHz. The calculations eliminate the possibility of IC1 as a prescaler or divide-by-x counter.

Thus, IC1 probably is an obsolete CD Don’t give up hope: Dataheet has many in stock for under a dollar. Jon Titus Herriman, UT. Channels A and B can be used independently or there is an exclusive OR output on pin The outputs are tri-state with the control on pin Pin 13 is not connected trlgger is very, very bad practice. However, channel B input pin 15 is tied high so only channel A is being used. Therefore, you can use any garden variety Schmitt trigger in its place.

triger Russell Kincaid Milford, NH. The IC in your frequency counter is a non inverting dual Schmidt trigger. The Motorola 45833 number is actually MCB. Only the A Schmidt is datadheet in your circuit, the B Schmidt is unused. The Schmidt trigger is used in front of the counter IC1 to ensure a clean input to the counter. For the MCB device these thresholds are adjustable via external resistors through the positive, negative and common terminals.


Supply voltage, 18volt max for this device Pin 8 is VSS. Roger Baker Redmond, WA. The pinout is not fully legible in the electronic issue. Using a Schmidt trigger in this application makes sense. I daatasheet attached a photo of the data sheet. The logic high output from Q1 is only 5V. Also the logic high output voltage from IC1 is too high for the 5V downstream logic.

It is possible that IC1 is not actually defective but is not seeing a logic high due to poor design. This theory can be tested by substituting a 7 volt power supply for the battery.

DATA – SHEETS CD40xx, CD41xxxx, CD42xx, CD43xx, CD44xx, CD45xx, CD47xx

If sxhmitt works at the lower voltage, I would modify the circuit to power IC1 from 5V. Dick Pope Eatonville, WA. The chip you are looking for is a CMOS The timer clocks the like a gate. I checked the usual places and it may be obsolete. Tom Grabowski via email.

Lance Corey via email. Using that to refine the search, the part is a dual Schmitt schmift buffer. The unique property of a Schmitt trigger gate is that it provides hysteresis. When a slow-rising, slow-falling, or noisy analog signal is applied to an ordinary gate, that gate may oscillate and switch several times as the input crosses its switching threshold.

But because this Schmitt trigger requires a much higher input voltage to switch high than it does to switch back low, it will clean up its analog input, and its output will switch only a single time.


In this circuit, that behavior is important because the input signal is being used as a clock for the counters. Without the Schmitt trigger, some input signals might trigger multiple clock pulses per cycle, resulting in wildly incorrect frequency numbers. Searching for Motorola’s specific version number of this part, MCBCP, seems to produce better search results, revealing data sheets and even a seller of the part on Amazon! However, because the circuit does not actually take advantage of the unique programmable hysteresis feature of the by just tying pins 5, 6, and 7 togetherany other CMOS Schmitt trigger should work just dtaasheet well, if you can find 4853 cheaper and don’t mind slightly modifying the circuit.


This appears to be a dual Schmitt Trigger. I found the NTEB data sheet at: So this would appear to be a Schmitt Trigger used to clean up the input signal.

The remaining four inverters should have their inputs grounded, to prevent excessive current consumption. Mike Hardwick Turner, OR. I have attached a. Worst case is you would need to rewire the schematic to use a more current version of an equivalent chip. Bruce Bubello via email. Try looking at a MCB dual schmitt triger with only one side used. Pin out looks correct, Pin 9 is input and Pin 4 is output. Pins 5, 6, 7 are used to adjust hysteresis.

Don Horne Markdale, ON. Trogger is this part: Cliff Harris Anaheim, CA. You can look at their data sheet here: Supposedly, a company called “Mountain States Electronics has one in stock. Here is their address and contact info: Since the inventory for Mountain States showed only 1 in stock, here is triggwr supplier of the TC Schmitt Trigger chip.

These people have a bunch of them and the price is definitely right: Kevin Kaas via email.

Need to brush up on your electronics principles? These multi-part series may be just what you shmitt The answer to question is it is an NE dual timer. Learning Electronics Need to brush up on your electronics principles?