74LS165 DIP 8-Bit Parallel-In Serial-Out Shift Register
The 74LS165 is a high speed TTL integrated circuit designed as an 8-bit shift register that allows for parallel-to-serial data conversion. It features eight individual parallel data inputs and a single serial output, making it an essential component for capturing multiple digital signals and transmitting them over a single data line. Data is loaded into the register asynchronously when the shift/load input is held at a low logic level.
When the shift/load input is high, the data is shifted out serially on each positive-going transition of the clock pulse. The IC also includes a serial input for cascading multiple 74LS165 units to create larger shift register chains. A clock inhibit input is provided to allow for precise control over the shifting process, effectively freezing the register's state when necessary. Its low power Schottky construction ensures high-speed operation with reduced power requirements for complex digital systems.
KEY FEATURES
- 8-bit parallel-to-serial data conversion
- Complementary serial outputs for logic flexibility
- Asynchronous parallel load capability
- Clock inhibit input for precise shift control
- Easily cascadable for longer bit-stream generation
- Standard 16 pin dual in line package
SPECIFICATIONS
- Supply Voltage 4.75V to 5.25V
- Operating Temperature 0 to 70 Celsius
- Logic Type TTL Low Power Schottky
- Maximum Clock Frequency 25MHz
- Typical Propagation Delay 15ns
- High Level Output Current -0.4mA
- Low Level Output Current 8mA
INTERFACES
- SH/LD Shift or parallel load input active low
- CLK Clock input positive edge triggered
- CLK INH Clock inhibit input
- SER Serial data input for cascading
- A to H Parallel data inputs
- QH Serial data output
- QH BAR Complementary serial data output
- VCC Positive supply voltage
- GND Ground reference
