Z86C9320FSC 8-Bit 20MHz ROMless MCU 44-LQFP | Zilog
MPN: Z86C9320FSC ✗ End of LifeZ86C9320FSC Overview
An 8-bit microcontroller is a programmable semiconductor device designed to execute embedded control logic using an 8-bit data path. The Z86C9320FSC belongs to the Z8 family of Zilog microcontrollers and is a ROMless device, meaning the application program is stored in external memory rather than embedded program ROM. This architecture separates the controller from the program memory, allowing the memory device to be selected according to application capacity, interface, and cost requirements.
The principal verified specifications are a maximum operating speed of 20 MHz, 236 KB of RAM, 24 I/O, three 8-bit timers, one UART interface, and a 44-LQFP package. The package provides 44 terminals for power, clock, reset, communications, timers, interrupts, general-purpose I/O, and external-memory connections. The reported speed options include 20 MHz, 25 MHz, and 33 MHz, while the distributor listing identifies the Z86C9320FSC specifically as a 20 MHz ROMless device.
The ROMless architecture is useful for applications that need larger or field-updatable firmware than a fixed-program microcontroller normally provides. External program-memory selection must account for bus timing, address capacity, signal integrity, and the controller's documented external-memory interface. The Z86C9320FSC should therefore be evaluated as a system component rather than only as a standalone MCU.
Typical application areas include industrial control panels, serial-control equipment, building automation modules, data-acquisition controllers, motor-control interfaces, and embedded communication products. A UART provides a practical path for host configuration, sensor networking, or supervisory control, while the three timers support periodic timing, input capture, or basic output-control functions depending on the complete peripheral configuration.
A critical design consideration is firmware availability: because this device is ROMless, the PCB must include an appropriate external memory solution and correct bus support components. Engineers should verify the complete Zilog documentation for electrical limits, pin assignments, memory-interface timing, clock requirements, and programming procedure before releasing a production layout.
This page consolidates verified distributor specifications, package information, sourcing details, and engineering-oriented application guidance. It also distinguishes documented facts from parameters that require confirmation from the manufacturer datasheet, helping designers compare the Z86C9320FSC efficiently without assuming unavailable electrical details.
Drop-in alternatives for Z86C9320FSC — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesZ86C9320FSC Maximum Ratings & Electrical Characteristics
| Microcontroller Type | 8-bit ROMless microcontroller |
| Product Family | Z8 |
| Maximum Clock Speed | 20 MHz |
| Reported Speed Options | 20 MHz, 25 MHz, 33 MHz |
| Program Memory | ROMless; external memory required |
| RAM | 236 KB |
| I/O Pins | 24 |
| 8-Bit Timers | 3 |
| Communication Interfaces | UART |
| Package | 44-LQFP (10 x 10 mm) |
| Terminal Count | 44 |
| Mounting Type | Surface mount |
| Temperature Grade | Commercial |
| Core Architecture | 8-bit |
| Data Bus Width | 8-bit |
| DigiKey Listing Availability | Ships today; current inventory subject to distributor confirmation |
Z86C9320FSC 44-lqfp (10 x 10 mm) Pin Configuration Guide
Pin configuration for Z86C9320FSC (44-lqfp (10 x 10 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for Z86C9320FSC.
Refer to the datasheet for full pin configuration.
Typical Applications
Z86C9320FSC is suitable for 6 applications: Industrial Control Panel, Serial Data-Acquisition Controller, Building Automation Module, Motor and Actuator Interface, Embedded Communication Controller, Programmable Logic Controller.
Industrial Control Panel
The Z86C9320FSC fits an industrial control panel that coordinates inputs, periodic actions, and host communications. Its verified 24 I/O support reduces the need for external GPIO expansion, while three 8-bit timers can support timing, pulse measurement, or output-control tasks. The 236 KB RAM is useful when firmware must retain operating data, event counters, and display or communication buffers. Because the controller is ROMless, the panel design can pair it with an appropriate external program-memory device. Engineers should verify external-bus timing and define watchdog, brownout, and safe-state behavior before connecting field wiring.
Recommended
Serial Data-Acquisition Controller
The Z86C9320FSC is suitable for coordinating sensors and actuators connected through a UART in a compact data-acquisition module. Its 20 MHz processing speed provides margin for protocol handling and control logic, while the verified 236 KB RAM can buffer received commands or samples before host transfer. The three 8-bit timers can establish sampling intervals or service periodic tasks. A ROMless implementation gives the designer freedom to select external program memory, although memory-map compatibility, address decoding, and write protection must be validated in the final schematic.
Recommended
Building Automation Module
The Z86C9320FSC can serve as the embedded controller in a building-automation node that reads sensors, drives discrete outputs, and reports status over a serial network. Its 24 I/O and three timers are useful for digital inputs, relay-control outputs, and periodic maintenance tasks, while 236 KB RAM accommodates local schedules and diagnostic state. The ROMless architecture permits the program memory to be selected according to firmware-update and capacity requirements. Production designers should provide hardware watchdog support, isolated interfaces where needed, and verified power-failure recovery for long-duration equipment operation.
Recommended
Motor and Actuator Interface
The Z86C9320FSC is appropriate for supervisory motor-control and actuator-interface modules where an 8-bit MCU must combine sequencing, status inputs, and communications. Three 8-bit timers provide resources for periodic control functions, and the 24 I/O can accept limit sensors and output device-enable signals. The 236 KB RAM allows the controller to retain motion profiles or diagnostic sequences without continuous host traffic. Because the MCU does not directly specify power-device ratings in the verified data, the output stage, protection network, grounding, and motor-noise isolation must be designed and validated separately.
Recommended
Embedded Communication Controller
The Z86C9320FSC can act as the protocol and routing controller in a compact communication appliance built around the Z8 architecture. Its UART supports a straightforward host or field-bus connection, and the 20 MHz clock and 236 KB RAM provide capacity for framing, buffering, diagnostics, and local configuration storage. The 44-LQFP package exposes 44 terminals, including the I/O and interface resources required for a multi-function controller. Designers should verify clock tolerance, UART electrical levels, and external-memory timing, then add appropriate protection for exposed industrial connections.
Recommended
Programmable Logic Controller
The Z86C9320FSC can serve as the core of a small programmable logic controller for sequencing, input monitoring, and operator communication. Its verified 24 I/O, three timers, UART, and 236 KB RAM align with compact PLC functions that require periodic scans and local event storage. The ROMless architecture allows program memory to be implemented in external storage, enabling capacity choices and potentially controlled firmware updates. A robust design must add watchdog handling, output isolation or appropriate driver stages, input conditioning, and comprehensive brownout testing because those protections are not established by the available distributor summaries.
Recommended
Recommended Products Summary
Engineering reference data for Z86C9320FSC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 44-LQFP (10 x 10 mm) |
| Brand | Zilog |
| Microcontroller Type | 8-bit ROMless microcontroller |
| Maximum Clock Speed | 20 MHz |
| Program Memory | ROMless; external memory required |
| RAM | 236 KB |
| I/O Pins | 24 |
| Timers | 3 x 8-bit timers |
| Communication Interfaces | UART |
| Temperature Grade | Commercial |
Key Differentiators
- ROMless architecture enables external program-memory selection (vs ATMEGA328P-MUR)
- Substantial internal RAM for an 8-bit controller (vs ATMEGA328P-MUR)
- Dedicated timer and serial-control resources (vs ATMEGA328P-MUR)
Design Notes
Treat the external program-memory bus as a critical high-speed interface. Route the Z86C9320FSC address, data, and control traces together, minimize stub lengths, and provide the decoupling and termination arrangement required by the manufacturer interface guidance. The available source summaries do not include the complete electrical or timing tables, so bus topology, pull-ups, and memory-select routing must be checked against the official datasheet before release.
Do not assume that the 236 KB RAM figure can store the complete application program. The Z86C9320FSC is ROMless, so firmware requires external program memory, and its bus must also be supported by the development toolchain and production programmer. Validate memory addresses, chip selects, write-enable behavior, and code-download procedures early; a package-compatible second source is not a substitute for confirming firmware compatibility.
The verified material supplied here does not specify the operating-voltage range or absolute maximum ratings. Before assigning a supply rail, confirm those limits in the manufacturer datasheet, calculate the worst-case current for external-memory access and I/O loading, and verify startup sequencing. Decoupling should follow the datasheet's recommended values and placement rather than generic assumptions about an 8-bit MCU.
Preserve the standard 44-LQFP land pattern, pin-1 orientation, solder-mask definition, and manufacturer-recommended footprint tolerances. Do not substitute a generic QFP footprint solely because the terminal count matches. Confirm whether exposed-pad and thermal requirements apply to the exact ordering code, and maintain solder-mask clearance and paste coverage appropriate to the verified package drawing.
Compliance Information
The supplied distributor and indexed datasheet information does not provide verified compliance declarations. Commercial temperature grade is reported by Partstack, but AEC-Q100 status cannot be inferred from that description.
