The oscillator con? The oscillator may be replaced by an external clock signal at input RS. The counter advances on the negative-going transition of RS. Ordering information Table 1. Functional diagram Fig 1.

Author:Nikojora Gugar
Language:English (Spanish)
Published (Last):18 March 2015
PDF File Size:6.12 Mb
ePub File Size:9.12 Mb
Price:Free* [*Free Regsitration Required]

Manual zz. The oscillator configuration allows design of either RC or crystal oscillator circuits. The oscillator may be replaced by an external clock signal at input RS.

The counter advances on the negative-going transition of RS. Ordering information Table 1. All rights reserved. Pinning information 6. It cannot be used as supply pin or input. Fig 5. Timing diagram 8. Limiting values Table 3. Recommended operating conditions Table 4. Static characteristics Table 5. Dynamic characteristics Table 6. Fig 8.

Fig 9. Fig Waveforms showing the master reset MR pulse width, the master reset to output Qn propagation delays and the master reset to clock RS recovery time Table 7. Test circuit for measuring switching times Table 8. RC oscillator The function of R2 is to minimize the influence of the forward voltage across the input protection diodes on the frequency. The stray capacitance C2 should be kept as small as possible. In consideration of accuracy, Ct must be larger than the inherent stray capacitance.

For starting and maintaining oscillation a minimum transconductance is necessary, so R2 should not be too large. A practical value for R2 is 2. External component connection for a crystal oscillator Fig RC oscillator frequency as a function of Rt Fig A1 min. A2 max. Plastic or metal protrusions of 0. Plastic interlead protrusions of 0. Abbreviations Table 9.

Revision history Table Legal information Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development.

Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information.

Short data sheet — A short data sheet is an extract from a full data sheet with the same product type number s and title. A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. For detailed and full information see the relevant full data sheet, which is available on request via the local NXP Semiconductors sales office.

In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information.

Right to make changes — NXP Semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice.

This document supersedes and replaces all information supplied prior to the publication hereof. Suitability for use — NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage.

Applications — Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Limiting values — Stress above one or more limiting values as defined in the Absolute Maximum Ratings System of IEC may cause permanent damage to the device.

Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the Characteristics sections of this document is not implied.

Exposure to limiting values for extended periods may affect device reliability. In case of any inconsistency or conflict between information in this document and such terms and conditions, the latter will prevail. No offer to sell or license — Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights.

General description stage binary ripple counter with oscillator. HEFB 1. General description Hex inverting buffers. CBTA 1. General description stage binary ripple counter.

Download PDF advertisement. Its a community-based project which helps to repair anything.


CPCI RS232 Interface

We use Cookies to give you best experience on our website. By using our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies. Please see our Privacy Policy for more information. Abstract: 3. In addition, the 4 MSB of the divider can be reset by , 4. Divider0 Fosc Q1 Q2. Q9 HEF.


Something went wrong...

You can download the circuit diagram here. It is spread over two sheets, one sheet covers the time base and the seconds, minutes and hours counters. The other sheet covers the display circuit and the power supply. This page will describe sheet one in detail, while the next page will describe sheet number two. Together with this knowledge you should be able to build the clock yourself too. As usual, with such a one of project, I didn't bother to create a PCB for the project. Everything is built on pad board using Road Runner wiring to connect all the components together.

Related Articles