XD74C922 – Keyboard Encoder – Xinluda

About this part

The XD74C922 from Xinluda is a CMOS 16-key keyboard encoder, a pin- and function-compatible member of the industry-standard 74C922 family. It provides all the logic required to fully encode an array of single-pole, single-throw (SPST) key switches, converting a key closure in a 4×4 (16-key) matrix into a 4-bit data nibble. This makes the XD74C922 a straightforward, low-component-count solution for adding keypad input to microcontrollers, microprocessors, and digital instrumentation.

The device integrates keyboard scanning, key debounce, and output latching on a single chip. Keyboard scan timing is set by either an external clock or a single external capacitor, and the internal debounce circuit requires only one additional external capacitor (and can be defeated entirely by omitting it). On-chip pull-up devices allow switches with up to 50 kΩ of on resistance to be used reliably, and no series diodes are needed in the switch array to eliminate ghost-key effects. A Data Available output flags each valid keystroke and supports two-key rollover.

Key Features

• 16-key (4×4 SPST matrix) CMOS keyboard encoder; outputs a 4-bit code per key
• Wide operating supply voltage: 3 V to 15 V
• Operating temperature range: -40°C to +85°C
• On-chip debounce using a single external capacitor (defeatable by omission)
• Keyboard scan via external clock or external capacitor
• On-chip pull-up devices accommodate switches with up to 50 kΩ on resistance
• No diodes required in the switch array to eliminate ghost switches
• Three-state outputs with output enable for easy bus interfacing
• Data Available output with two-key rollover
• 18-pin DIP package; pin- and function-compatible with the standard 74C922

Applications

• Numeric and function keypads for microcontroller and microprocessor systems
• Industrial control panels and HMI front panels
• Test, measurement, and bench instrumentation
• Point-of-sale terminals and access-control keypads
• Appliance and embedded user-input interfaces
• Legacy product maintenance and 74C922 drop-in replacement

Why Source XD74C922 from Pacific Component Xchange

The XD74C922 is a specialty 74C922-family encoder with limited authorized-distributor stock, which can make it difficult to source through mainstream channels. Pacific Component Xchange is an independent distributor focused on hard-to-find and obsolete power-management ICs, logic, and optocouplers. We help engineers and buyers secure the XD74C922 and equivalent 16-key encoders even when standard catalogs show them as unavailable.

Every order is backed by our commitment to authenticity and quality, with global shipping to keep your production lines and service operations running. If you need the XD74C922 for a new build, an end-of-life replacement, or a drop-in equivalent to another 74C922-type part, request a quote (RFQ) from Pacific Component Xchange and our sourcing team will respond with availability and pricing.