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Analog Devices DS80C323-QCD+ — Microcontrollers & Processors (MCU / MPU / DSP)

Maxim DS80C323-QCD+ 8-bit MCU, 18 MHz, ROMless, 44-PLCC

MPNDS80C323-QCD+
End of Life

Maxim Integrated 80C series 8-bit 8051 MCU, DS80C323-QCD+, 18 MHz, ROMless, 256 x 8 RAM, 2.7 V to 5.5 V, 32 I/O, 44-PLCC, 0°C to 70°C.

$11.01Ref. price · indicative, final on quote
Packaging44-LCC (J-Lead)
RoHSROHS3 Compliant
Series80C
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

DS80C323-QCD+ specifications
ParameterValue
Series80C
MountingSurface Mount
Oscillator typeExternal
Program memory typeROMless
Voltage - supply (Vcc (Vdd))2.7V ~ 5.5V
Operating temperature0°C ~ 70°C (TA)
Speed18MHz
PackageTube
RAM size256 x 8
Core size8-Bit
PeripheralsPower-Fail Reset, WDT
ConnectivityEBI/EMI, SIO, UART/USART
Number of i (O)32
Core processor8051
Case44-LCC (J-Lead)

Product details

The Maxim Integrated DS80C323-QCD+ is an 8-bit microcontroller built around the 8051 core, clocked at 18 MHz. It is a ROMless device — no on-chip program memory — so code resides in an external EPROM, Flash, or OTP memory accessed through the external bus interface. The part integrates 256 x 8 bytes of internal RAM, 32 I/O lines, a power-fail reset, and a watchdog timer. Packaged in a 44-lead PLCC with J-leads (44-PLCC, 16.59 x 16.59 mm body), it is intended for surface-mount assembly.

ROMless architecture — BOM implications

Because the DS80C323-QCD+ has no program memory on-chip, every design must budget for an external EPROM, Flash, or OTP memory. That adds a second IC, extra board area, and a separate programming step during manufacturing. The trade-off is flexibility: the external memory can be swapped for a different density or supplier without changing the MCU, and firmware updates can be handled by replacing the memory device — or, if using Flash, by in-system programming through the UART or SIO.

Maxim Integrated (now part of Analog Devices) is the sole manufacturer for this part. There is no second-source listed in the available records, so the BOM carries single-source exposure on the MCU itself. The part is RoHS3 compliant.

Frequently asked questions

Where can I buy the DS80C323-QCD+ in tube packaging?

The DS80C323-QCD+ is available to order through independent distribution. It is sourced and quoted against an RFQ, with availability and current pricing confirmed at the time of quote. Tube packaging is the standard shipping medium for this PLCC part.

Is the DS80C323-QCD+ obsolete or end of life?

No. The DS80C323-QCD+ has an official Active lifecycle status with no announced end-of-life or last-time-buy schedule. It is suitable for new designs and ongoing production.

What is the closest pin-compatible alternative to the DS80C323-QCD+?

Within the Maxim 80C family, the DS80C320 series shares the same 8051 core and 44-PLCC package, but those parts include on-chip ROM or EPROM variants. A direct pin-compatible ROMless sibling is the DS80C323-QND+ (same die, different ordering code). For a cross-vendor alternative, the AT89C51 from Microchip is a common 8051 derivative, but it uses a different package (40-pin DIP or 44-pin PLCC) and includes on-chip Flash, so a board redesign would be required.

Is the DS80C323-QCD+ compatible with 8051 compilers?

Yes. The DS80C323-QCD+ uses the standard 8051 core, so it is fully compatible with all major 8051 C compilers (Keil, IAR, SDCC) and assemblers. The 18 MHz clock speed is within the range supported by these toolchains.

What is the DS80C323-QCD+'s listed speed?

The maximum clock speed is 18 MHz. This determines the instruction cycle time — at 18 MHz, most instructions execute in 1 to 4 clock cycles, giving a throughput of roughly 4.5 to 18 MIPS depending on the instruction mix.