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9316FMQB Datasheet(PDF) 2 Page - Texas Instruments |
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9316FMQB Datasheet(HTML) 2 Page - Texas Instruments |
2 / 12 page TLF6606 June 1989 9316DM9316 Synchronous 4-Bit Counters General Description These synchronous presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs The 9316 is a 4-bit binary counter The carry output is decoded by means of a NOR gate thus preventing spikes during the normal counting mode of operation Synchronous operation is provided by having all flip-flops clocked simulta- neously so that the outputs change coincident with each other when so instructed by the count-enables inputs and internal gating This mode of operating eliminates the output counting spikes which are normally associated with asyn- chronous (ripple clock) counters A buffered clock input trig- gers the four flip-flops on the rising (positive-going) edge of the clock input waveform These counters are fully programmable that is the outputs may be preset to either level As presetting is synchronous setting up a low level at the load input disables the counter and causes the outputs to agree with the setup data after the next clock pulse regardless of the levels of the enable input Low-to-high transitions at the load input are perfectly acceptable regardless of the logic levels on the clock or enable inputs The clear function is asynchronous and a low level at the clear input sets of the flip-flop outputs low re- gardless of the levels of clock load or enable inputs The carry look-ahead circuitry provides for cascading coun- ters for n-bit synchronous applications without additional gating Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output Both count- enable inputs (P and T) must be high to count and input T is fed-forward to enable the ripple carry output The ripple car- ry output thus enabled will produce a high-level output pulse with a duration approximately equal to the high-level portion of the QA output This high-level overflow ripple carry pulse can be used to enable successive cascaded stages High- to-low level transitions at the enable P or T inputs may occur regardless of the logic level in the clock Features Y Internal look-ahead for fast counting Y Carry output for n-bit cascading Y Synchronous counting Y Load control line Y Diode-clamped inputs Y Typical clock frequency 35 MHz Y Pin-for-pin replacements popular 5474 counters 5416A7416A (binary) Y Alternate MilitaryAerospace device (9316) is available Contact a National Semiconductor Sales OfficeDistrib- utor for specifications Connection Diagram Dual-In-Line Package TLF6606 – 1 Order Number 9316DMQB 9316FMQB DM9316J DM9316W or DM9316N See NS Package Number J16A N16E or W16A C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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