M74HC393B1R STMicroelectronics

M74HC393 DUAL BINARY COUNTER HIGH SPEED : f = 79 MHz (TYP.) at V = 6V MAX CC LOW POWER DISSIPATION: I =4A(MAX.) at T =25C CC A HIGH NOISE IMMUNITY: V = V = 28 % V (MIN.) NIH NIL CC DIP SOP TSSOP SYMMETRICAL OUTPUT IMPEDANCE: I = I = 4mA (MIN) OH OL BALANCED PROPAGATION DELAYS: t t PLH PHL ORDER CODES WIDE OPERATING VOLTAGE RANGE: PACKAGE TUBE T & R V (OPR) = 2V to 6V CC DIP M74HC393B1R PIN AND FUNCTION COMPATIBLE WITH SOP M74HC393M1R M74HC393RM13TR 74 SERIES 393 TSSOP M74HC393TTR DESCRIPTION The M74HC393 is an high speed CMOS DUAL and each has an independent clear input. When BINARY COUNTER fabricated with silicon gate CLEAR is set to low, all four bits of each counter 2 C MOS technology. are set to a low level. This enables count This counter circuit contains independent ripple truncation and allows the implementation of divide carry counters and two 4-bit ripple carry binary by N counter configurations. counters, which can be cascaded to create a All inputs are equipped with protection circuits single divide by 256 counter. against static discharge and transient excess Each 4-bit counter is incremented on the high to voltage. low transition (negative edge) of the clock input, PIN CONNECTION AND IEC LOGIC SYMBOLS July 2001 1/11M74HC393 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION Clock Input Divide by 2 1 CLOCK 1, 13 Section (HIGH to LOW 2 CLOCK Edge-Triggered) 1 CLEAR Asynchronous Master 2, 12 Reset Inputs 2 CLEAR 3, 4, 5, 6 1QA to 1QD Flip Flop Outputs 11, 10, 9, 8 2QA to 2QD Flip Flop Outputs 7 GND Ground (0V) 14 Vcc Positive Supply Voltage TRUTH TABLE INPUTS OUTPUTS CLOCK CLEAR QD QC QB QA X H LL LL L COUNT UP L NO CHANGE X : Dont Care OUTPUTS COUNT QD QC QB QA 0L L L L 1L L L H 2L L H L 3L L H H 4L H L L 5L H L H 6L H H L 7L H H H 8H L L L 9H L L H 10 HL HL 11 H L H H 12 H H L L 13 H H L H 14 H H H L 15 HH HH 2/11