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CD54AC191F3A 데이터시트(PDF) 1 Page - Texas Instruments |
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1 / 10 page 1 Data sheet acquired from Harris Semiconductor SCHS243A CD54AC191, CD54ACT191 Presettable Synchronous 4-Bit Binary Up/Down Counter Features • Buffered Inputs • Typical Propagation Delay - 12.8ns at VCC = 5V, TA = 25 oC, C L = 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 50 Ω Transmission Lines Description 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/D) input is either LOW for up- counting or HIGH for down-counting. The counter is incre- mented or decremented synchronously with the LOW-to- HIGH transition of the clock. When an overflow or underflow of the counter occurs, the Terminal Count (TC) output, which is LOW during counting, goes HIGH and remains HIGH for one clock cycle. This out- put can be used for look-ahead carry in high-speed cascad- ing (see Figure 12). The TC output also initiates the Ripple Clock (RC) output which, normally HIGH, goes LOW and remains LOW for the low-level cascaded using the Ripple Count output. Pinout CD54AC191, CD54ACT191 (CERDIP) TOP VIEW Ordering Information PART NUMBER TEMP. RANGE (oC) PACKAGE CD54AC191F3A -55 to 125 16 Ld CERDIP CD54ACT191F3A -55 to 125 16 Ld CERDIP NOTES: 1. When ordering, use the entire part number. Add the suffix 96 to obtain the variant in the tape and reel. 2. Wafer and die for this part number is available which meets all elec- trical specifications. Please contact your local TI sales office or cus- tomer service for ordering information. 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 P1 Q1 Q0 CE U/D Q2 GND Q3 VCC CP RC TC PL P2 P3 P0 October 1998 - Revised May 2000 CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. FAST™ is a Trademark of Fairchild Semiconductor. Copyright © 2000, Texas Instruments Incorporated |
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