TTL and LTTL Categorisation of TTL and LTTL Series Typical Average Typical Power Frequency Dissipation of Operation per 74 Series No. of max. Package Number Function Description Leads (MHz) (mW) Counters ZN7490A BCD Decade Counter 14 42 145 ZN74L90 8CD Decade Counter 14 6 20 ZN7492A 1 Divide-by-12 Counter 14 42 130 ZN7493A Divide-by-16 Counter 14 42 130 ZN74L93 Divide-by-16 Counter 14 6 16 ZN74161 Synchronous Binary Counter 16 32 305 ZN74163 Synchronous Binary Counter 16 32 305 ZN74191 Reversible Binary Counter 16 25 325 ZN74192 Reversible Decade Counter 16 32 325 ZN74L192 Reversible Decade Counter 16 7 42 ZN74193 Reversible Binary Counter 16 32 325 ZN74L193 Reversible Binary Counter 16 7 42 ZN74197_ Binary Counter 14 70 240 Shift Registers ZN7491A 8-Bit Shift Register SISO 14 18 175 ZN74L91 8-Bit Shift Register SISO 14 6-5 17-5 ZN7494 4-Bit Shift Register PISO 16 18 175 ZN7495A 4-Bit Shift Register PIPO (Reversible) 14 36 195 ZN74L95 4-Bit Shift Register PIPO 14 5 19 ZN7496_5-Bit Shift Register PIPO 16 18 240 ZN74L96 5-Bit Shift Register PIPO 16 9 120 ZN74164 8-Bit Shift Register SIPO 14 36 167 ZN74L164 8-Bit Shift Register SIPO 14 18 84 ZN74165 8-Bit Shift Register PISO 16 26 210 ZN74166 8-Bit Shift Register PISO 16 35 360 ZN74194 4-Bit Shift Register PIPO (Reversible) 16 36 195 11