Z86C9333ASG - 33MHz 8-Bit ROMless MCU | Zilog
MPN: Z86C9333ASG ✓ ActiveZ86C9333ASG Overview
An 8-bit microcontroller is a compact embedded processor designed to execute control instructions from externally supplied program memory. The ROMless architecture places code in external memory rather than an internal masked-ROM array, allowing the same controller to be used with different program-storage arrangements. Within the product hierarchy, the Z86C9333ASG is an embedded microcontroller, an integrated circuit, and a semiconductor intended for industrial automation, instrumentation, and equipment-control applications.
The principal operating specifications are a 33 MHz clock, an 8-bit CPU architecture, and a 4.5 V to 5.5 V supply range. The device also incorporates a multiplier and divider capability according to the product description. These functions make it useful in control systems that need arithmetic scaling, frequency generation, timing measurement, or peripheral clock division without relying on a higher-cost processor architecture.
The Z86C9333ASG uses a 48-pin LQFP package, providing a comparatively high pin count for an 8-bit controller and supporting connection of multiple external interfaces and memory devices. Its 7 x 7 mm body keeps the component practical for compact industrial control boards. The package exposes the controller's external program-memory interface, general-purpose I/O, and other device functions through a surface-mount footprint requiring careful signal-integrity and layout planning.
Typical uses include industrial controllers, data-acquisition equipment, programmable logic controllers, instrumentation, and embedded automation modules. A designer may select this device when the application fits an 8-bit control model but requires external program memory, moderate processing speed, and extensive I/O. It can also serve as a dedicated subsystem controller alongside another processor when peripheral management or timing functions dominate the design.
PCB implementation should prioritize a short, continuous ground return beneath the device and careful routing of clock, reset, and external-memory signals. Decoupling capacitors should be placed directly beside the relevant supply pins, while external program-memory routing should minimize propagation delay between the controller and memory components. Before release, verify the exact pin assignments, electrical timing, and power requirements against the Zilog datasheet.
This product page combines the Z86C9333ASG's confirmed operating characteristics, application guidance, sourcing information, and design considerations in a format that helps engineers evaluate the controller before beginning PCB layout or firmware development.
Drop-in alternatives for Z86C9333ASG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesZ86C9333ASG Maximum Ratings & Electrical Characteristics
| Microcontroller Type | 8-bit ROMless Z8 microcontroller |
| Maximum Clock Frequency | 33 MHz |
| CPU Architecture | 8 bit |
| Product Family | Z8 C93 |
| Operating Voltage Range | 4.5 V to 5.5 V |
| Program Memory Architecture | ROMless |
| Multiplier/Divider Capability | Supported |
| Package Type | 48-pin LQFP |
| Package Body Size | 7 x 7 mm |
| Total Pin Count | 48 pins |
| Mounting Type | Surface mount |
| RoHS Status | Compliant |
Z86C9333ASG 7 x 7 mm Pin Configuration Guide
Pin configuration for Z86C9333ASG (7 x 7 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 Z86C9333ASG.
Refer to the datasheet for full pin configuration.
Typical Applications
Z86C9333ASG is suitable for 6 applications: Industrial Automation Controller, Programmable Logic Controller, Data-Acquisition Instrumentation, Embedded Equipment Timer, Programmable Test Fixture, Peripheral Subsystem Controller.
Industrial Automation Controller
The Z86C9333ASG fits an industrial automation controller that coordinates sensors, actuators, status indicators, and communication interfaces at 33 MHz. Its 8-bit Z8 architecture is appropriate for deterministic supervisory control, while the 48-pin LQFP provides numerous external connections for I/O and external program memory. The ROMless architecture also allows program storage to be selected according to system capacity. Implement the controller around a continuous ground plane, local 5 V decoupling, and short clock and external-memory routing. Confirm environmental ratings against the deployed machine conditions before production release.
Programmable Logic Controller
A programmable logic controller can use the Z86C9333ASG for scan-based logic, counters, interlocks, and output sequencing. The 33 MHz operating frequency supports responsive handling of an 8-bit instruction set, and the multiplier/divider capability may assist scaling and timing calculations. The 48-pin LQFP offers enough connectivity for field inputs, outputs, and external program storage. Validate scan-time margins and peripheral timing in the final firmware. Use the manufacturer timing information to avoid placing long bus routes between the controller and external memory.
Data-Acquisition Instrumentation
The Z86C9333ASG is suitable for instrumentation that must acquire sensor inputs, perform scaling, maintain timing, and present results through a local interface. Its ROMless design permits external program storage, which is useful when field upgrades or larger programs are required. The 33 MHz clock and multiplier/divider function can support measurement calculations and clock-derived operations. Keep analog front-end circuitry separate from high-speed digital routing, and follow a solid grounding strategy to minimize measurement error. ADC characteristics and available serial interfaces must be confirmed in the manufacturer documentation.
Embedded Equipment Timer
Equipment requiring multiple timers, elapsed-time measurement, periodic events, and deterministic control can use the Z86C9333ASG as a dedicated timer controller. Its 33 MHz processing rate supports responsive task execution, while the multiplier/divider capability supports scaling and frequency-related calculations. The 48-pin LQFP package allows external memory, status signaling, and multiple control outputs. During layout, route oscillator and timing-sensitive traces away from switching nodes and use a stable reference-ground region. Confirm timer resolution and interrupt behavior against the device documentation before relying on a particular timing resolution.
Programmable Test Fixture
A test fixture can employ the Z86C9333ASG to coordinate stimulus sequencing, relay control, fixture identification, and result communication. The ROMless architecture supports externally stored programs for reusable or configurable test sequences, and the 33 MHz processor provides headroom for real-time coordination. The 48-pin package offers sufficient connections for control outputs, inputs, and bus-based communication. Validate signal timing at the fixture interface and use controlled impedance or appropriate series termination where long external traces are unavoidable. The device should remain within its specified 4.5 V to 5.5 V supply range.
Peripheral Subsystem Controller
The Z86C9333ASG can serve as a peripheral subsystem controller beside a higher-level processor, handling I/O scanning, timing, and external-memory operations. Its 8-bit architecture can provide a straightforward control path for devices that do not justify a separate application processor. The 33 MHz operating speed and multiplier/divider capability support more active control tasks than a very small low-speed MCU. Establish clear hardware handshaking with the main processor and avoid overlapping bus ownership. Package-level decoupling, grounded return paths, and controlled signal transitions are essential for reliable integration.
Engineering reference data for Z86C9333ASG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | Zilog |
| Package | 48-pin LQFP (7 x 7 mm) |
| Microcontroller Type | 8-bit ROMless Z8 microcontroller |
| Maximum Clock Frequency | 33 MHz |
| Operating Voltage Range | 4.5 V to 5.5 V |
| Program Memory Architecture | ROMless |
| Multiplier/Divider Capability | Supported |
| Product Family | Z8 C93 |
Key Differentiators
- ROMless external program-memory architecture (vs AT80C51RD2-RLTUM)
- Multiplier and divider capability (vs AT80C32X2-RLTUL)
- 48-pin LQFP integration (vs AT80C51RD2-RLTUM)
Design Notes
Assign every one of the 48 LQFP connections from the manufacturer pin-description table before routing. Place input and output bypass capacitors immediately beside their associated supply pins, and avoid placing them at a distant board edge. Provide a continuous ground reference beneath the device and keep external program-memory traces short. The LQFP footprint also requires careful component placement so adjacent-pin assembly clearances remain practical.
Use the manufacturer timing diagrams to define setup and hold requirements for the external program-memory interface. Keep clock routing short and isolated from switching nodes and high-current actuator traces. If the board requires long external connections or a populated bus, evaluate trace topology, loading, and termination rather than relying on nominal logic levels alone. A functional firmware test should include worst-case bus and memory-access timing.
Design the supply for a steady 5 V nominal system while keeping the controller within its 4.5 V to 5.5 V operating range. Confirm the device's power consumption and internal peripheral states from the manufacturer datasheet, then select the regulator and decoupling network with suitable margin. Check startup and reset behavior in the complete power sequence, especially when external memory or field-bus transceivers share the same rail.
Do not treat a general comparison listing as proof that another 8-bit controller is pin-compatible. A valid replacement must match the 48-pin LQFP land pattern, pin functions, voltage range, external-memory protocol, clock assumptions, reset behavior, and critical timing. Also verify programmer, bootloader, peripheral, and firmware dependencies. A footprint-only match is insufficient for a production substitution.
Compliance Information
The LCSC product listing identifies the Z86C9333ASG as RoHS compliant. No additional compliance declaration was established for the other attributes.