description. The ‘HC are 4-bit synchronous, reversible, up/down binary counters. Synchronous counting operation is provided by having all flip-flops clocked. 74HC datasheet, 74HC pdf, 74HC data sheet, datasheet, data sheet, pdf, Philips, Presettable synchronous 4-bit binary up/down counter. 74HC Counter ICs are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74HC Counter ICs.

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Asynchronous parallel load capability permits the counter to be preset to any desired value. Information present on the parallel data inputs D0 to D3 is loaded into the counter and appears on the outputs when the parallel load PL input is LOW.

74HC (Philips) – Presettable Synchronous 4-bit Binary Up/down Counter, Counters

This operation overrides the counting function. Do not use the TC output as a clock signal because it is subject to decoding spikes. The TC signal is used internally to enable the RC output. This feature simplifies the design of multistage counters as datasheey in Figure 5 and Figure 6. In Figure 5, each RC output is used as the clock input to the next higher stage.

The timing skew between state changes in the first and last stages is represented by the cumulative delay of the clock as it ripples through the preceding stages. This can be a disadvantage of this configuration in some applications.

Figure 6 shows a method of causing state changes to occur simultaneously in all stages.

74HC191 Datasheet PDF

In Figure 7, the configuration shown avoids ripple delays and their associated restrictions. Combining the TC signals from all the preceding stages forms the CE input for a given stage. An enable must be included in each carry datxsheet in order to inhibit counting.

The TC output of a given stage it not affected by its own CE signal therefore the simple inhibit scheme of Figure 5 and Figure 6 does not apply. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC. Ordering information Table 1. Functional diagram Fig 2. Logic symbol 74HC All information provided in this document is subject to legal disclaimers.


Product datasheeet sheet Rev.

Pin configuration SO16 Fig 4. Functional description Table 3. Logic diagram 74HC All information provided in this document is subject to legal disclaimers.

74HC Datasheet pdf – Presettable synchronous 4-bit binary up/down counter – Philips

Typical timing sequence 7. Limiting values Table 5. Recommended operating conditions Table 6. Static characteristics Table 7.

Dynamic characteristics Table 8. The clock input CP to outputs Qn, TC propagation dataaheet, clock dtasheet width and maximum clock frequency 74HC All information provided in this document is subject to legal disclaimers. The parallel load input PL to output Qn propagation delays 74HC All information provided in this document is subject to legal disclaimers. The parallel load input PL to clock CP recovery times, parallel load pulse width and output Qn transition times 74HC All information provided in this document is subject to legal disclaimers.

Measurement points are given in Table 9. Test circuit for measuring switching times Table Revision history Table 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 latest product status information is available on the Internet at URL http: The content is still under malfunction of an NXP Semiconductors product can reasonably be expected internal review and subject to formal approval, which may result in to result in personal injury, death or severe property or environmental modifications or additions.

NXP Semiconductors does not give any damage. Short data sheet — A short data sheet is an extract from a full data sheet Applications — Applications that are described herein for any of these with the same product type number s and title.

A short data sheet is intended products are for illustrative purposes only. NXP 74hhc191 makes no for quick reference only and should not be relied upon to contain detailed and representation or warranty that such applications will be suitable for the full information.

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Limiting values are stress ratings only and proper operation of the device at these or any other conditions above those given in In no event shall NXP Semiconductors be liable for any indirect, incidental, the Recommended operating conditions section if present or the punitive, special or consequential damages including – without limitation – lost Datzsheet sections of this document is not warranted. Constant datashwet profits, lost savings, business interruption, costs related to the removal or repeated exposure to limiting values will permanently and irreversibly affect replacement of any products 774hc191 rework charges whether or not such the quality and reliability of the device.

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74HC191 Datasheet

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