TC74HC40102,40103AP/AF TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic TC74HC40102AP, TC74HC40102AF TC74HC40103AP, TC74HC40103AF TC74HC40102AP/AF Dual BCD Programmable Down Counter TC74HC40103AP/AF 8-Bit Binary Programmable Down Counter TC74HC40102AP, TC74HC40103AP The TC74HC40102A and TC74HC40103A are high speed CMOS PROGRAMMABLE DOWN COUNTERS fabricated with 2 silicon gate C MOS technology. They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. The output terminal ( CO/ZD ) goes to an active low state when the down count reaches zero. Since the TC74HC40102A is designed as a BCD counter, programming up to 99 counts is possible. The TC74HC40103A, with its 8-bit binary construction, TC74HC40102AF, TC74HC40103AF can be set to provide up to 255 counts. Both devices have Inhibit Clock ( CI/CE ), Asynchronous Preset Control ( APE ), Synchronous Preset ( SPE ) and Clear Control ( CLR ) inputs for setting the counter to the maximum counting mode. All inputs are equipped with protection circuits against static discharge or transient excess voltage. Features Weight DIP16-P-300-2.54A : 1.00 g (typ.) High speed: f 40 MHz (typ.) at V = 5 V max CC SOP16-P-300-1.27A : 0.18 g (typ.) Low power dissipation: I = 4 A (max) at Ta = 25C CC High noise immunity: V = V = 28% V (min) NIH NIL CC Output drive capability: 10 LSTTL loads Symmetrical output impedance: I = I = 4 mA (min) OH OL Balanced propagation delays: t t pLH pHL Wide operating voltage range: V (opr) = 2 to 6 V CC Pin and function compatible with 40102B, 40103B Pin Assignment Start of commercial production 1988-11 1 2014-03-01 TC74HC40102,40103AP/AF IEC Logic Symbol TC74HC40102A TC74HC40103A Truth Table Control Inputs Mode Functional Description CLR APE SPE CI/CE H H H H Count Inhibit Count is inhibited regardless of other inputs. H H H L Regular Count Down count on the rising edge of CK H H L X Synchronous Preset Input data is preset on the rising edge of CK H L X X Asynchronous Preset Input data is asynchronously preset to CK L X X X Clear Counter is set to maximum count. X: Dont care Maximum count: TC74HC40102A 99, TC74HC40103A 255 2 2014-03-01