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54F 74F190 Up Down Decade Counter with Preset and Ripple Clock
November 1994
54F 74F190 Up Down Decade Counter with Preset and Ripple Clock
General Description
The ’F190 is a reversible BCD (8421) decade counter featuring synchronous counting and asynchronous presetting The preset feature allows the ’F190 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
Features
Y Y Y Y
High-speed 125 MHz typical count frequency Synchronous counting Asynchronous parallel load Cascadable
Commercial 74F190PC
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 Cerpack 20-Lead Ceramic Leadless Chip Carrier Type C
54F190DM (Note 2) 74F190SC (Note 1) 54F190FM (Note 2) 54F190LM (Note 2)
Note 1 Devices also available in 13 reel Use suffix e SCX
J16A M16A W16A E20A
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 9494–1
IEEE IEC
TL F 9494 – 2
TL F 9494 – 3
TL F 9494–4
TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation
TL F 9494
RRD-B30M75 Printed in U S A
Unit Loading Fan Out
54F 74F Pin Names Description UL HIGH LOW 10 30 10 10 10 10 10 10 10 10 50 33 3 50 33 3 50 33 3 Input IIH IIL Output IOH IOL 20 mA b1 8 mA 20 mA b0 6 mA 20 mA b0 6 mA 20 mA b0 6 mA 20 mA b0 6 mA b 1 mA 20 mA b 1 mA 20 mA b 1 mA 20 mA
CE CP P0 – P3 PL U D Q0 – Q3 RC TC
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)
Functional Description
The ’F190 is a synchronous up down BCD decade counter containing four edge-triggered flip-flops with internal gating and steering logic to provide individual preset count-up and count-down operations It has an asynchronous parallel load capability permitting the counter to be preset to any desired number When the Parallel Load (PL) input is LOW information present on the Parallel Data inputs (P0 – P3) is loaded into the counter and appears on the Q outputs This operation overrides the counting functions as indicated in the Mode Select Table A HIGH signal on the CE input inhibits counting When CE is LOW internal state changes are initiated synchronously by the LOW-to-HIGH transition of the clock input The direction of counting is determined by the U D input signal as indicated in the Mode Select Table CE and U D can be changed with the clock in either state provided only t.