Counter Single 4-Bit Binary UP/Down 16-Pin PDIP Tube

The M74HC191 is an high speed CMOS 4-BIT SYNCHRONOUS UP/DOWN COUNTER fabricated with silicon gate C2MOS technology. State changes of the counter are synchronous with the LOW-to-HIGH transition of the Clock Pulse Input. An asynchronous parallel load input overrides counting and loads the data present on the DATA inputs into the flip-flops, which makes it possible to use the circuits as programmable counters. A count enable input serves as the carry/borrow input in multi-stage counters. Control input, Down/ Up, determines whether a circuit counts up or down. A MAX/MIN output and a Ripple Clock output provide overflow/underflow indication and make possible a variety of methods for generating carry/borrow signals in multi-stage counter applications.

• 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.)
• SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN)
• BALANCED PROPAGATION DELAYS: tPLH ? tPHL
• WIDE OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V
• PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 191