EZ80F91GAZ0BEG - 50MHz 8-bit eZ80 MCU 256KB Flash | Zilog
MPN: EZ80F91GAZ0BEG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.5 | $13.50 |
| 10 | $12.4 | $124.00 |
| 100 | $11.1 | $1,110.00 |
| 500 | $9.85 | $4,925.00 |
| 1,000 | $8.65 | $8,650.00 |
EZ80F91GAZ0BEG Overview
An 8-bit microcontroller (MCU) is a programmable processor whose data path and arithmetic logic unit are 8 bits wide, optimized for cost-sensitive, deterministic control tasks. The eZ80 CPU extends the classic Z80 instruction set, allowing the device to operate in Z80-compatible 64 KB addressing mode or full 24-bit addressing mode that addresses up to 16 MB of linear memory, bridging legacy Z80 codebases with modern memory-intensive applications. The EZ80F91 family sits within Zilog's eZ80Acclaim! portfolio of flash microcontrollers, targeting embedded networking and industrial control.
Key features of the EZ80F91GAZ0BEG include a 50 MHz CPU core with 10 MIPS peak performance, an on-chip 10/100 Ethernet MAC, a full-speed USB 2.0 (12 Mbps) device/host controller, two UARTs, I2C and SPI peripherals, an 8-channel 10-bit ADC, four 16-bit timers, and a real-time clock with separate power domain. The integrated crypto accelerator (when enabled) supports DES, 3DES, and AES, supporting the ZGATE security feature set.
The eZ80F91 uses a 3-stage pipelined architecture and 16-MB linear memory map. The integrated Ethernet MAC, USB, and crypto blocks share the high-speed peripheral bus, while legacy Z80-compatible peripherals (UART, timers, GPIO) retain their original register mappings. This hybrid architecture allows developers to port Z80/Z180 code while adding modern connectivity.
Typical applications include industrial control, embedded communication gateways, point-of-sale terminals, security and access control panels, building automation controllers, and networked sensor hubs. The integrated Ethernet and USB make it especially useful for low-cost networked devices.
When designing with the EZ80F91GAZ0BEG, ensure the 3.0V to 3.6V supply is decoupled with a 100 nF ceramic capacitor near each VDD pin pair. The 50 MHz clock requires a 50 ppm crystal for USB and Ethernet timing accuracy. For industrial noise immunity, place a ferrite bead between the analog AVDD and digital VDD rails.
This page synthesizes distributor pricing, application circuits, and pin-compatible alternatives not found in the manufacturer datasheet, helping engineers select and source the EZ80F91GAZ0BEG efficiently.
Drop-in alternatives for EZ80F91GAZ0BEG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with EZ80F91GAZ0BEG (same form factor and footprint) — differing in Package, UART, Core Architecture, Ethernet MAC, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
EZ80F91AZ050EG
✅ Drop-In✓ In Stock
$11.85 / Unit
View Datasheet →eZ80F91AZ050SG
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →EZ80F92AZ050EG
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
EZ80F91GAZ0BEG Maximum Ratings & Electrical Characteristics
| Core Architecture | eZ80 (8-bit, Z80-compatible, 24-bit extended addressing) |
| Maximum CPU Clock | 50 MHz |
| Peak Performance | 10 MIPS (single-cycle instruction fetch) |
| Program Memory (Flash) | 256 KB (256K x 8) |
| SRAM | 16 KB |
| Addressing Modes | Z80-compatible (64 KB) and full 24-bit (16 MB) |
| Operating Voltage | 3.0 V to 3.6 V |
| Operating Temperature | -40 C to +105 C |
| Ethernet MAC | 10/100 Mbps with MII/RMII interface |
| USB Controller | USB 2.0 Full-Speed (12 Mbps) Device/Host |
| Crypto Accelerator | DES / 3DES / AES (ZGATE security feature) |
| ADC | 8-channel, 10-bit |
| Timers | 4 x 16-bit |
| UART | 2 x UART |
| Peripherals | I2C, SPI, IrDA, RTC with separate power domain |
| Package | 144-LQFP (20 mm x 20 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
EZ80F91GAZ0BEG 144-lqfp (20 mm x 20 mm) Pin Configuration Guide
Pin configuration for EZ80F91GAZ0BEG (144-lqfp (20 mm x 20 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 EZ80F91GAZ0BEG.
Refer to the datasheet for full pin configuration.
Typical Applications
EZ80F91GAZ0BEG is suitable for 6 applications: Industrial Control and Automation, Point-of-Sale (POS) Terminals, Building Automation Controllers, Embedded Communication Gateways, Security and Access Control Panels, Networked Sensor Hubs and IoT Edge Nodes.
Industrial Control and Automation
The EZ80F91GAZ0BEG fits industrial control because it provides deterministic 8-bit eZ80 performance at 50 MHz, dual UART for RS-232/RS-485 fieldbus, an 8-channel 10-bit ADC for analog sensor inputs, and the industrial -40 C to +105 C temperature range required for factory floor operation. Placed as the main controller on a DIN-rail PLC or motor-control board, the MCU reads sensor inputs through the ADC, drives outputs through PWM timers, and communicates to a master PLC over Modbus RTU via UART. Unlike 32-bit ARM Cortex-M parts, the eZ80F91's Z80-compatible core allows direct porting of legacy Z80/Z180 control code. A real benefit is the integrated Ethernet MAC which removes the need for an external PHY companion chip.
Recommended
Point-of-Sale (POS) Terminals
The EZ80F91GAZ0BEG is well matched to POS terminal designs because it integrates 10/100 Ethernet, USB 2.0 device/host, dual UARTs, and the ZGATE DES/3DES/AES accelerator for payment encryption - all in a single 144-LQFP chip. In a typical POS layout, the eZ80F91 drives the LCD display controller over SPI, reads the keypad via GPIO interrupts, receives card swipe data on UART, and connects to the payment gateway through Ethernet. The 256 KB flash accommodates full firmware stacks including encryption libraries. A trade-off is the 8-bit core, which limits cryptographic throughput versus 32-bit MCUs; for high-transaction-volume POS systems, ARM Cortex-M3/M4 parts may be preferred.
Recommended
Building Automation Controllers
The EZ80F91GAZ0BEG suits building automation because the on-chip Ethernet MAC enables BACnet/IP or Modbus TCP communication, USB host supports Wi-Fi/Bluetooth dongles for wireless commissioning, and the 256 KB flash stores controller firmware with multiple communication stacks. In an HVAC controller, the eZ80F91 reads temperature sensors through the 8-channel 10-bit ADC, controls fan and damper actuators through PWM timers, and reports status to a central building management system over Ethernet. The 16 KB SRAM is sufficient for BACnet/IP stacks. Designers gain a single-chip networked controller versus multi-chip ARM + external MAC designs.
Recommended
Embedded Communication Gateways
The EZ80F91GAZ0BEG fits embedded gateway designs because the on-chip 10/100 Ethernet MAC plus USB 2.0 host allows bridging between Ethernet and USB devices, while dual UARTs support serial-to-Ethernet protocol conversion. In a typical serial-to-Ethernet gateway, the eZ80F91 receives RS-232/RS-485 data on UART, encapsulates frames per Modbus TCP or custom protocols, and forwards to the Ethernet network. The Z80-compatible 64 KB addressing mode simplifies porting of legacy gateway firmware. The integrated Ethernet MAC removes a companion chip versus MCU+ENC28J60 designs. For high-throughput gateways, an ARM Cortex-M4 part may be required.
Recommended
Security and Access Control Panels
The EZ80F91GAZ0BEG is appropriate for security panels because the ZGATE DES/3DES/AES hardware crypto engine accelerates encrypted credential verification, the on-chip Ethernet MAC connects to IP-based access control networks, and GPIO interrupts handle door sensors and keypads. In an access control panel, the eZ80F91 reads Wiegand-format card readers on GPIO/UART, validates encrypted credentials against the on-chip crypto block, drives the door strike relay, and logs events over Ethernet to a central server. The 256 KB flash fits full credential databases and access logic. Compared to software-only crypto on Cortex-M0, hardware AES offloads the CPU significantly.
Recommended
Networked Sensor Hubs and IoT Edge Nodes
The EZ80F91GAZ0BEG works well in IoT edge nodes because the integrated 10/100 Ethernet plus optional USB Wi-Fi dongle provides TCP/IP connectivity without external MAC chips, while the 8-channel ADC reads multiple analog sensors simultaneously. In a remote sensor hub, the eZ80F91 samples temperature, humidity, and pressure sensors on the ADC, runs edge-processing algorithms on the 50 MHz core, and reports aggregated data to a cloud server over Ethernet. The ZGATE crypto block secures MQTT or HTTPS payloads. Compared to bare Cortex-M0+Wi-Fi modules, the eZ80F91 offers wired Ethernet reliability for industrial IoT.
Recommended
Recommended Products Summary
Engineering reference data for EZ80F91GAZ0BEG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | EZ80F91AZ050EG | eZ80F91AZ050SG | EZ80F92AZ050EG |
|---|---|---|---|---|
| Package | LQFP-144 (20x20 mm) | LQFP-144 (20x20) - same | LQFP-144 (20x20) - same | LQFP-144 (20x20) - same |
| Brand | Zilog | Zilog | Zilog | Zilog |
| Core Architecture | 8-bit eZ80 (Z80-compatible) | 8-bit eZ80 (Z80-compatible) | 8-bit eZ80 (Z80-compatible) | 8-bit eZ80 (enhanced) |
| Maximum Clock Speed | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 16 KB | 16 KB | 16 KB | 16 KB |
| Ethernet MAC | 10/100 Mbps integrated | 10/100 Mbps integrated | 10/100 Mbps integrated | 10/100 Mbps integrated |
| ZGATE Crypto Accelerator | Enabled (DES/3DES/AES) | Disabled | Enabled | Enabled (enhanced) |
| Operating Temperature | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C |
Key Differentiators
- Integrated 10/100 Ethernet MAC with MII/RMII eliminates external PHY controller chip (vs ARM Cortex-M0 + external ENC28J60)
- ZGATE hardware DES/3DES/AES crypto accelerator offloads encryption (vs Software-only crypto on Cortex-M0)
- Z80-compatible 64 KB addressing mode enables direct porting of legacy Z80/Z180 firmware (vs ARM Cortex-M0 microcontrollers)
Design Notes
The EZ80F91GAZ0BEG operates from a single 3.0 V to 3.6 V supply. According to Zilog PS0192, separate analog AVDD and digital VDD pins must be tied together through a ferrite bead for noise isolation, with 100 nF ceramic decoupling capacitors placed within 5 mm of each VDD pin pair. A bulk 10 uF tantalum capacitor on the main 3.3 V rail suppresses transient current demands during Ethernet and USB active transmission.
Place the 50 MHz crystal or oscillator within 5 mm of the XTAL1/XTAL2 pins and keep the traces short and surrounded by a ground guard ring. Route the Ethernet MII/RMII traces as a matched-length 50 ohm impedance group and keep them away from switching power or USB data lines to minimize crosstalk. The exposed thermal pad of the 144-LQFP should be soldered to a continuous ground pour to reduce junction temperature at full 50 MHz operation.
Do not exceed the 3.6 V absolute maximum on any VDD pin or the on-chip PHY will be damaged. Ensure the 50 MHz clock source has 50 ppm or better accuracy; the integrated USB 2.0 full-speed peripheral requires 12.000 MHz +/- 50 ppm for compliance. When porting legacy Z80 code, verify the eZ80 24-bit extended mode is disabled (ZDI register) or the entire 16 MB memory map is initialized; otherwise legacy code will execute in unintended address ranges.
Compliance Information
RoHS compliance confirmed via distributor listings and Zilog product page. Halogen-free status and conflict minerals reporting status not explicitly stated in provided data - marked unknown.