54ac191 National Semiconductor Corporation, 54ac191 Datasheet
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54ac191
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54ac191 Summary of contents
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... Up/Down Counter with Preset and Ripple Clock General Description The ’AC191 is a reversible modulo 16 binary counter. It fea- tures synchronous counting and asynchronous presetting. The preset feature allows the ’AC191 to be used in program- mable dividers. The Count Enable input, the Terminal Count output and the Ripple Clock output make possible a variety of methods of implementing multistage counters ...
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Functional Description The ’AC191 is a synchronous up/down counter. The ’AC191 is organized as a 4-bit binary counter. It contains four edge-triggered flip-flops with internal gating and steering logic to provide individual preset, count-up and count-down operations. Each circuit has ...
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Functional Description (Continued) FIGURE 1. N-Stage Counter Using Ripple Clock FIGURE 2. Synchronous N-Stage Counter Using Ripple Carry/Borrow FIGURE 3. Synchronous N-Stage Counter with Parallel Gated Carry/Borrow DS100279-7 DS100279-8 3 DS100279-9 www.national.com ...
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State Diagram Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com DS100279-5 4 DS100279-6 ...
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Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Input Diode Current ( −0. ...
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DC Characteristics for ’AC Family Devices Note 2: All outputs loaded; thresholds on input associated with output under test. Note 3: Maximum test duration 2.0 ms, one output loaded at a time. Note 4: I and I @ 3.0V are ...
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AC Operating Requirements Symbol Parameter t Setup Time, HIGH or LOW Hold Time, HIGH or LOW Setup Time, LOW Hold Time, LOW h ...
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Physical Dimensions inches (millimeters) unless otherwise noted 20 Terminal Ceramic Leadless Chip Carrier (L) 16 Lead Ceramic Dual-In-Line Package (D) NS Package Number E20A NS Package Number J16A 9 www.national.com ...
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR ...