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74F191PC Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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74F191PC Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 12 page ©1988 Fairchild Semiconductor Corporation www.fairchildsemi.com 74F191 Rev. 1.0.2 3 Mode Select Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = LOW-to-HIGH Clock Transition = LOW Pulse RC Truth Table Note: 1. TC is generated internally. Inputs Mode PL CE U/D CP HL L Count Up HL H Count Down L XXX Preset (Asyn.) HH XX No Change (Hold) Inputs Output CE TC(1) CP RC LH HX XH XLX H 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 Gated Carry/Borrow |
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