74LS161 Datasheet (PDF) - Motorola, Inc 74LS161 Product details The LS160A 161A 162A 163A are high-speed 4-bit synchronous count ers They are edge-triggered, synchronously presettable, and cascadable MSI building blocks for counting, memory addressing, frequency division and other applications The LS160A and LS162A count modulo 10 (BCD) The LS161A and LS163A count modulo 16 (binary )