MC74F169

4-STAGE SYNCHRONOUS BIDIRECTIONAL COUNTERS The MC54/74F168 and MC54/74F169 are fully synchronous 4-stage up/ down counters. The F168 is a BCD decade counter; the F169 is a modulo-16 binary counter. Both feature a preset capability for programmable operation, carry lookahead for easy cascading, and a U/D input to control the direction of counting. All state changes, whether in counting or parallel loading, are initiated by the LOW-to-HIGH transition of the clock. Asynchronous Counting and Loading Built-In Lookahead Carry Capability Presettable for Programmable Operation CONNECTION DIAGRAM (TOP VIEW) VCC 16 TC 15 Q0 14 Q1 13 Q2 12 Q3 11 CET 10 PE 9 16 MC54/74F168 MC54/74F169 4-STAGE SYNCHRONOUS BIDIRECTIONAL COUNTERS FAST™ SCHOTTKY TTL J SUFFIX CERAMIC CASE 620-09 1 16 N SUFFIX PLASTIC CASE 648-08 1 1 U/D 2 CP 3 P0 4 P1 5 P2 6 P3 7 CEP 8 GND MODE SELECT TABLE PE L H H H H CEP X L L H X CET X L L X H U/D X H L X X Action on Rising Clock Edge Load (Pn Qn) Count Up (Increment) Count Down (Decrement) No Change (Hold) No Change (Hold) 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION MC54FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC H = HIGH Voltage Level; L = LOW Voltage Level; X = Don’t Care STATE DIAGRAMS MC54/74F169 0 1 2 3 4 LOGIC SYMBOL 9 3 4 5 6 PE P0 P1 P2 P3 U/D CEP TC CET CP Q0 Q1 Q2 Q3 14 13 12 11 MC54/74F168 0 1 2 3 15 5 1 7 10 2 10 9 11 15 4 14 13 14 6 15 13 7 VCC = Pin 16 GND = Pin 8 8 7 6 5 12 12 11 10 9 8 COUNT DOWN C...