Up/Down Counter with Preset and Ripple Clock
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General Description
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The AC191 is a reversible modulo 16 binary counter. It features synchronous counting and asynchronous presetting. The preset feature allows the AC191 to be used in programmable dividers. The Count Enable input, the Terminal Count output and the Ripple Clock output make possible a variety of methods of implementing multistage counters. In the counting modes, state changes are initiated by the rising edge of the clock.
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Features
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ICC reduced by 50%
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High speed-133 MHz typical count frequency
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Synchronous counting
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Asynchronous parallel load
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Cascadable
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Outputs source/sink 24 mA
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Datasheet
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Product Status/Pricing/Packaging
| 74AC191MTC | Full Production | RoHS Compliant | $0.245 | TSSOP | 16 | RAIL
| | Line 1: $Y (Fairchild logo)
&Z (Asm. Plant Code)
&2 (2-Digit Date Code)
&K
Line 2: AC191
| | 74AC191MTCX | Full Production | RoHS Compliant | $0.61 | TSSOP | 16 | TAPE REEL
| | Line 1: $Y (Fairchild logo)
&Z (Asm. Plant Code)
&2 (2-Digit Date Code)
&K
Line 2: AC191
| | 74AC191PC | Full Production | RoHS Compliant | $0.67 | DIP | 16 | RAIL
| | Line 1: $Y (Fairchild logo)
&Z (Asm. Plant Code)
&4 (4-Digit Date Code)
&K
Line 2: 74AC191PC
| | 74AC191SC | Full Production | RoHS Compliant | $0.54 | SOIC | 16 | RAIL
| | Line 1: $Y (Fairchild logo)
&Z (Asm. Plant Code)
&2 (2-Digit Date Code)
&K
Line 2: 74AC191
| | 74AC191SCX | Full Production | RoHS Compliant | $0.52 | SOIC | 16 | TAPE REEL
| | Line 1: $Y (Fairchild logo)
&Z (Asm. Plant Code)
&2 (2-Digit Date Code)
&K
Line 2: 74AC191
| | 74AC191SJ | Full Production | RoHS Compliant | $0.72 | SOP | 16 | RAIL
| | Line 1: $Y (Fairchild logo)
&Z (Asm. Plant Code)
&2 (2-Digit Date Code)
&K
Line 2: 74AC191
| | 74AC191SJX | Full Production | RoHS Compliant | $0.80 | SOP | 16 | TAPE REEL
| | Line 1: $Y (Fairchild logo)
&Z (Asm. Plant Code)
&2 (2-Digit Date Code)
&K
Line 2: 74AC191
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* Fairchild 1,000 piece Budgetary Pricing
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| ** A sample button will appear if the part is available through Fairchild's on-line samples program. If there is no sample button, please contact a Fairchild distributor to obtain samples |
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Qualification Support
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Eco Status