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Infineon Technologies CY8C27543-24AXI — Logic ICs
Infineon Technologies

Cypress CY8C27543-24AXI PSoC1 MCU, 8-Bit 24MHz, 16KB Flash

MPNCY8C27543-24AXI
End of Life

Cypress PSoC1 CY8C27xxx CY8C27543-24AXI, 8-Bit M8C MCU, 24MHz, 16KB Flash, 256x8 RAM, 40 I/O, I²C/SPI/UART, 4x14b ADC + 4x9b DAC, 44-TQFP, -40°C to 85°C.

$12.94Ref. price · indicative, final on quote
CY8C27543-24AXI datasheet
Packaging44-LQFP
StockContact for availability
MOQ1 pcs
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Specifications

CY8C27543-24AXI Technical Specifications
ParameterValue
SeriesPSOC®1 CY8C27xxx
Mounting typeSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))3V ~ 5.25V
Operating temperature-40°C ~ 85°C (TA)
Speed24MHz
PackageTray
RAM size256 x 8
Core size8-Bit
PeripheralsPOR, PWM, WDT
ConnectivityI²C, SPI, UART/USART
Number of i (O)40
Core processorM8C
Case44-LQFP
Data convertersA/D 4x14b; D/A 4x9b
Program memory size16KB (16K x 8)

Product details

24 MHz M8C core with on-chip analog — the PSoC1 mixed-signal MCU

The Cypress CY8C27543-24AXI is an 8-bit PSoC1 microcontroller from the CY8C27xxx family, built around the M8C core running at 24 MHz.

16 KB Flash, 256 x 8 RAM — sizing the firmware and data footprint

With 16 KB of Flash and 256 bytes of RAM, this part targets firmware images that fit a modest control loop, configuration tables, and a small state machine. The 256 x 8 RAM is tight for buffering — a UART receive line at 115200 baud with a 64-byte ring buffer leaves 192 bytes for stack and variables. If your application needs a larger lookup table or a multi-packet serial protocol, the CY8C29566-24AXIT sibling (same 24 MHz M8C core, same 40 I/O, same package footprint) ups the Flash to 32 KB and the RAM to 2 KB, which buys headroom for more complex firmware without changing the board layout.

Frequently asked questions

How many I/O pins does CY8C27543-24AXI have?

It provides 40 general-purpose I/O lines, accessible on the 44-pin LQFP package. That count is enough to interface with a parallel LCD, a keypad matrix, and a few serial peripherals without needing an I/O expander.

What is the closest functional alternative to CY8C27543-24AXI?

The CY8C29566-24AXIT is a pin-compatible upgrade within the PSoC1 family: same 24 MHz M8C core, same 40 I/O and 44-TQFP footprint, but with 32 KB Flash and 2 KB RAM plus a 12-channel 14-bit ADC. It is a drop-in replacement when firmware and data memory headroom are needed.