Z86C9320FSC
Z86C9320FSC 8-Bit 20MHz ROMless MCU 44-LQFP | Zilog
The Zilog Z86C9320FSC is an 8-bit Z8 ROMless microcontroller operating at up to 20 MHz in a 44-LQFP package measuring 10 x 10 mm. It provides 236 KB of RAM, 24 I/O pins, three 8-bit timers, and a UART communication interface. Z86C9320FSC is intended for embedded control designs where external program memory is required and a compact, high-pin-count surface-mount implementation is preferred.
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.
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