SN74LS90N – Decade/Divide-by-10 Counter IC (LS-TTL, DIP-14)

Texas Instruments vintage binary counter – perfect for clocks, frequency dividers & digital logic projects!

🔍 Key Features

✔ Decade Counter – Counts 0-9 (BCD output) or acts as divide-by-10
✔ Flexible Configuration – Can also function as divide-by-2 + divide-by-5
✔ Asynchronous Operation – No clock sync required
✔ 14-Pin DIP – Breadboard & protoboard friendly
✔ Wide Voltage Range – 4.75V to 5.25V (standard TTL)

📊 Technical Specifications

• Logic Family: LS-TTL (Low-Power Schottky)

• Counting Modes: BCD (0-9) or binary (divide-by-2/5/10)

• Max Clock Frequency: 32MHz

• Propagation Delay: 40ns max

• Operating Temp: 0°C to +70°C

• Package: PDIP-14

🔧 Classic Applications

✅ Digital Clocks – Drive 7-segment displays
✅ Frequency Dividers – Convert 60Hz to 1Hz (clock pulses)
✅ Industrial Counters – Event tally systems
✅ Retro Computing – 1970s/80s logic designs