Overview
The MC14094BDR2 is a CMOS-based 8-bit serial-in/parallel-out shift register with output latches, part of ON Semiconductor's 4000B series. Designed for reliability in industrial environments, it features a wide operating voltage range and low power consumption (typically 10µA at 5V). As a surface-mount device in SOIC-16 packaging, it integrates well with modern PCB designs. Its compatibility with both CMOS and TTL logic levels makes it versatile for interfacing between different digital systems, while built-in ESD protection enhances durability.
Structure and Working Principle
The IC consists of an 8-stage shift register with serial data input (DS) and clock (CP) pins, plus a storage register with separate latch enable (STR) control. Data shifts through the register on CP's rising edge, then transfers to output latches when STR goes high. Parallel outputs (Q0-Q7) remain stable during shifting, preventing glitches in downstream circuits. An output enable (OE) pin allows tri-state control for bus sharing. The design includes buffered inputs for improved noise immunity and symmetrical propagation delays (typically 200ns at 5V).
Key Features
Wide voltage operation (3V-18V DC) accommodates battery-powered and industrial applications. With static current under 1µA at 5V, it's ideal for power-sensitive designs. The device offers balanced propagation delays (tPLH/tPHL) for predictable timing, and can drive 2 TTL loads at 5V. Robust construction includes 2kV HBM ESD protection and latch-up immunity exceeding 250mA. Industrial temperature range (-55°C to +125°C) ensures reliability in harsh environments.
Application Areas
Primary uses include LED matrix control (converting serial microcontroller data to parallel outputs), industrial PLC I/O expansion, and keyboard scanning circuits. In automation systems, multiple ICs can be daisy-chained for extended bit lengths. Secondary applications encompass serial data buffering, simple memory addressing, and waveform generation. The tri-state outputs facilitate bus-oriented designs, while the latch function enables synchronous updates of multiple outputs—critical for display applications preventing flicker.
Maintenance and Precautions
While CMOS devices are generally robust, proper handling is essential. Use anti-static measures during installation—recommended working environment should have <60% RH to prevent moisture absorption. For thermal management, ensure adequate PCB copper area for heat dissipation in high-speed (>5MHz) applications. Avoid exceeding absolute maximum ratings (20V supply voltage, 10mA output current). For unused inputs, tie them to VDD or GND to prevent floating gate oscillations.
B2B Procurement Guide
Verify authenticity through authorized distributors like Arrow or Avnet, as counterfeit CMOS ICs are prevalent. Industrial-grade (MC14094BDR2G) variants offer tighter parametric control for critical applications. Minimum order quantities typically start at 1,000 units, with 12-16 week lead times for non-stock items. Consider alternative packaging (TSSOP-16) if space-constrained. For prototyping, sample requests may be available through manufacturer programs. Always check date codes to avoid obsolete stock.
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