Infineon Technologies CY8C21123-24SXIT

Overview

CY8C21123-24SXIT from Cypress Semiconductor is a programmable 8-bit Harvard-architecture PSoC® SoC featuring an M8C core running at up to 24 MHz, 4 KB flash, 256 bytes SRAM, and configurable analog/digital blocks for mixed-signal embedded control. It operates from 2.4 V to 5.25 V (or down to 1.0 V with on-chip switch-mode pump), supports –40 °C to +85 °C industrial temperature range, and integrates UART, SPI, I²C, PWMs, 10-bit ADC, and comparators - deployed in sensor interface and motor control subsystems.

For engineers reviewing the CY8C21123-24SXIT datasheet, CY8C21123-24SXIT pinout, CY8C21123-24SXIT application, or CY8C21123-24SXIT equivalent, key selection criteria include its 8-pin SOIC package, 24 MHz M8C CPU, dual 10-bit ADC capability, programmable GPIO drive modes (25 mA sink), and integrated 1.3 V voltage reference for precision analog signal conditioning.

Technical Context

The CY8C21123-24SXIT implements a fixed-function M8C 8-bit CPU core with Harvard architecture, supporting up to 24 MHz operation via internal ±5% IMO oscillator (±2.5% within 0–70 °C). Its digital system comprises four 8-bit PSoC blocks configurable as timers, counters, PWMs, CRC, or PRS modules, all routable to any GPIO through global digital interconnect.

The analog system includes four Type "E" PSoC blocks: two comparators (each with DAC or 1.3 V reference), and single/dual 10-bit 8-to-1 ADC configurations. All analog inputs are accessible on up to eight GPIO pins, and the 1.3 V internal voltage reference feeds both ADC and comparator subsystems with traceable accuracy.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (SOIC-8), 150 mil width, RoHS-compliant, JEDEC MS-012AC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable mixed-signal controller applications.

Compared with CY8C201A0-SX24, CY8C21123-24SXIT delivers true mixed-signal flexibility with 10-bit ADC and dual comparators; versus CY8C21223-24SXIT, it trades I/O count and analog resources for minimal footprint and lower cost in space-constrained applications.

Availability

CY8C21123-24SXIT is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat interfaces, low-power motor starters, and USB-to-serial bridge adapters requiring stable component supply and long-term manufacturability.

Supply support for CY8C21123-24SXIT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable embedded solutions, memory, and connectivity ICs for industrial, automotive, and consumer markets.

The CY8C21x23 PSoC family targets cost-sensitive, space-constrained embedded control applications requiring flexible analog/digital integration without external support components.

FAQ

What is the maximum operating frequency of the M8C core in CY8C21123-24SXIT?

The M8C core operates at up to 24 MHz using the internal main oscillator (IMO). This frequency is achievable across the full industrial temperature range (–40 °C to +85 °C) with ±5% tolerance; tolerance tightens to ±2.5% within 0–70 °C. External crystals up to 24 MHz may also be used for improved stability.

Does CY8C21123-24SXIT support in-system programming without a dedicated programmer?

Yes - it supports In-System Serial Programming (ISSP) via two dedicated pins (P0[2] and P0[3]) using standard UART or custom protocols. No external high-voltage programmer is needed; firmware updates can be performed through a simple serial interface during production or in the field.

Can all GPIO pins be used for analog input simultaneously?

No - while up to eight GPIO pins support analog input mode (P0[0]–P0[3], P1[0]–P1[3]), the CY8C21123-24SXIT's 8-pin SOIC package physically exposes only P0[0]–P0[3]. The remaining analog-capable pins (P1[0]–P1[3]) are unavailable in this package variant.

Is the internal 1.3 V voltage reference available for external use?

No - the 1.3 V reference is routed exclusively to internal analog blocks (ADC, comparators) and cannot be accessed at any package pin. It is not intended as an external reference source; designers requiring external reference must add a discrete voltage reference IC.