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 Datasheet is loaded into the counter and appears on the outputs when the parallel load PL input is LOW.
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 datqsheet as shown 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 datasheft of this configuration in some applications. Figure 6 shows a method of causing state changes to occur simultaneously in all stages. In Figure 7, the configuration shown avoids ripple delays and their associated restrictions. Datasueet the TC signals from all the preceding stages forms the CE input for a given stage.
An enable must be included in each carry gate 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 datsaheet Table 1. Functional diagram Fig 2. Logic symbol 74HC All information provided in this document is subject to legal disclaimers. Product data sheet Rev. Pin configuration SO16 Fig 4. Functional description Table 3. Logic datashet 74HC All information provided in this document is subject to legal disclaimers.
Typical timing sequence 7. Limiting values Table 5. Recommended operating conditions Table 6. Static characteristics Table 7. Dynamic characteristics Table datashdet.
The clock input CP 74hc19 outputs Qn, TC propagation delays, clock pulse 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.
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74HC Datasheet(PDF) – NXP Semiconductors
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