CD54ACT191 - Texas Instruments

CD54ACT191 Presettable Synchronous 4-Bit Binary Up/Down Counter

The CD54AC191 and CD54ACT191 are asynchronously presettable binary up/down synchronous counters that utilize Advanced CMOS Logic technology. Presetting the counter to the number on preset data inputs (P0-P3) is accomplished by setting LOW the asynchronous parallel load input (PL). Counting occurs when PL is HIGH, Count Enable (CE) is LOW, and the Up/Down (U/.

Features

• Buffered Inputs
• Typical Propagation Delay - 12.8ns at VCC = 5V, TA = 25oC, CL = 50pF
• Exceeds 2kV ESD Protection MIL-STD-883, Method 3015
• SCR-Latchup-Resistant CMOS Process and Circuit Design
• Speed of Bipolar FAST™/AS/S with Significantly Reduced Power Consumption
• Balanced Propagation Delays
• AC Types Feature 1.5V to 5.5V Operation and Balanced Noise Immunity at 30% of the Supply
• ±24mA Output Drive Current - Fanout to 15 FAST™ ICs - Drives 50Ω Transmission Lines Description The CD54AC191 and CD54ACT191 are asynchronously presettable binary up/down synchronous counters that utiliz.