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.
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