74F191 Datasheet | National Semiconductor

Description The ’F191 is a reversible modulo-16 binary counter featuring synchronous counting and asynchronous presetting The preset feature allows the ’F191 to be used in programmable dividers The Count Enable input the Terminal Count output and 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 Features High-Speed 125 MHz typical count frequency Synchronous counting Asynchronous parallel load Cascadable mercial 74F191PC Military Package Number N16E Package Description 16-Lead (0 300 Wide) Molded Dual-In-Line 16-Lead Ceramic Dual-In-Line 16-Lead (0 150 Wide) Molded Small Outline JEDEC 16-Lead (0 300 Wide) Molded Small Outline EIAJ 16-Lead Cerpack 20-Lead Ceramic Leadless Chip Carrier Type C 54F191DM (Note 2) 74F191SC (Note 1) 74F191SJ (Note 1) 54F191FM (Note 2) 54F191LM (Note 2) J16A M16A M16D W16A E20A Note 1 Devices also available in 13 reel Use suffix e SCX and SJX Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB FMQB and LMQB Logic Symbols Connection Diagrams Pin Assignment for DIP SOIC and Flatpak Pin Assignment for LCC TL F 9495- 1 IEEE IEC TL F 9495 - 2 TL F 9495 - 3 TL F 9495- 4 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 9495 RRD-B30M75 Printed in U S A Unit Loading Fan Out 54F 74F Pin Names CE CP P0 - P3 PL U D Q0 - Q3 RC TC Description Count Enable Input (Active LOW) Clock Pulse Input (Active Rising Edge) Parallel Data Inputs Asynchronous Parallel Load Input (Active LOW) Up Down Count Control Input Flip-Flop Outputs Ripple Clock Output (Active LOW) Terminal Count Output (Active HIGH) UL Input IIH IIL HIGH LOW Output IOH IOL 10 30 10 10 10 10 10 10 10 10 50 33 3 50 33 3 50 33 3 20 m A b1 8 m A 20 m A b0 6 m A 20 m A b0 6 m A 20 m A b0 6 m A 20 m A b0 6 m A b 1 m A 20 m A b 1 m A 20 m A b 1 m A 20 m A Functional...