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CD4538

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Technical/Catalog InformationCD4538BCM
VendorFairchild Semiconductor
CategoryIntegrated Circuits (ICs)
Logic TypeMonostable
Independent Circuits2
Voltage - Supply3 V ~ 15 V
Mounting TypeSurface Mount
Package / Case16-SOIC
PackagingTube
Operating Temperature-55°C ~ 125°C
Propagation Delay100ns
Current - Output High, Low8.8mA, 8.8mA
Schmitt Trigger InputNo
Drawing Number*
Lead Free StatusLead Free
RoHS StatusRoHS Compliant
Other Names CD4538BCM
CD4538BCM

Product Manufacturers Pack D/C
CD4538 - - -

Pinout/Connection Diagram

cd4538 Circuit

The input pulse is fed into the sample-and-hold amplifier (an inexpensive AD582), as well as the comparator U3. The SHA's output also is fed into the comparator. If the input pulse is higher in am-plitude than the SHA's output, the comparator output goes low and the 4538 one-shot produces a l0-ps pulse that is fed back to cause the SHA to sample and then hold the voltage. Subsequent input voltages that are less than the held value won't cause the one-shot to fire again.

Gates U4A and U4B are used to inhibit the sampling when necessary. Gates U4C and U4D, at the one-shot's output, can force the AD 582 into the sample mode. This feature is useful to reset the output to zero by forcing a sample when the input to the AD582 is zero. The polarity of the peak-hold circuit can be easily changed from positive-to-negative peak hold by reversing the inputs of the comparator.

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PDF / Datasheet

CD4538BC PDF Download

CD4538BC

File Size: 141872 KB
Manufacturer: fairchild

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