HCF4009 (Hex Inverting Buffer/Converter)

HCF4009 is a monolithic integrated circuit, specifically an inverting hex buffer/converter, primarily used for CMOS to DTL/TTL logic-level conversion and as a current driver. It provides six independent inverting buffer circuits within a single package. 

Key Features and Specifications

According to the STMicroelectronics datasheet, the HCF4009UB offers several features: 

• Function: Hex Inverting Buffer/Converter
• Logic Conversion: Capable of CMOS to DTL/TTL logic-level conversion using only one supply voltage (VDD).
• Current Capability: Provides high "sink" and "source" current capability, meaning it can drive a wide range of loads, including two standard DTL/TTL loads when VDD = 5V.
• Voltage Range: Features wide supply voltage operation, with parametric ratings at 5V, 10V, and 15V.
• Input Leakage Current: Very low input leakage current, typically 100nA at 18V and 25°C.
• Noise Immunity: Offers good noise margin, typically 1V with VDD=5V, 2V with VDD=10V, and 2.5V with VDD=15V.
• Package Type: Available in 16-lead dual in-line plastic or ceramic packages (DIP16). 

Applications

The HCF4009UB is used in various applications where logic level shifting or high current driving is required: 

• CMOS to DTL/TTL logic level converters
• Current "sink" or "source" drivers
• Multiplexer (1 to 6)