View m74hc191 datasheet:

M74HC191 4 BIT SYNCHRONOUS UP/DOWN COUNTERS HIGH SPEED : fMAX = 61 MHz (TYP.) at VCC = 6V LOW POWER DISSIPATION: ICC =4µA(MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = VNIL = 28 % VCC (MIN.) DIP SOP TSSOP SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ? tPHL ORDER CODES WIDE OPERATING VOLTAGE RANGE: PACKAGE TUBE T & R VCC (OPR) = 2V to 6V DIP M74HC191B1R PIN AND FUNCTION COMPATIBLE WITH SOP M74HC191M1R M74HC191RM13TR 74 SERIES 191 TSSOP M74HC191TTR DESCRIPTION The M74HC191 is an high speed CMOS 4-BIT input in multi-stage counters. Control input, Down/ SYNCHRONOUS UP/DOWN COUNTER Up, determines whether a circuit counts up or fabricated with silicon gate C2MOS technology. down. A MAX/MIN output and a Ripple Clock