-74LS   데이터시트

ON Semiconductor

DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER

ON Semiconductor

QUAD 2-INPUT NOR GATE

ON Semiconductor

SCHMITT TRIGGERS DUAL GATE/HEX INVERTER

ON Semiconductor

SCHMITT TRIGGERS DUAL GATE/HEX INVERTER

ON Semiconductor

TRIPLE 3-INPUT NAND GATE

Motorola => Freescale

DUAL 1-OF-4 DECODER / DEMULTIPLEXER

ON Semiconductor

DECADE COUNTER; 4-BIT BINARY COUNTER

ON Semiconductor

BCD DECADE/MODULO 16 BINARY SYNCHRONOUS BI-DIRECTIONAL COUNTERS

ON Semiconductor

DUAL DECADE COUNTER; DUAL 4-STAGE BINARY COUNTER