Key facts
- Brand
- Winbond
- Model
- W78C33
- Category
- Other Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-11
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Winbond W78C33B 8-bit Microcontroller Datasheet
The W78C33B is an 8‑bit CMOS microcontroller with a wide frequency range and full static design. It offers four 8‑bit bidirectional ports, an extra 4‑bit port, three 16‑bit timer/counters, a full‑duplex serial port, and six‑source, two‑level interrupt capability. The device supports ROMless operation and two software‑selectable power‑reduction modes (idle and power‑down).
Key features include 256 bytes of on‑chip RAM, 64 KB program and data address spaces, built‑in power management, and multiple package options (PLCC‑44, QFP‑44, TQFP‑44). The datasheet details pin assignments, electrical characteristics, timing diagrams, and a typical application circuit.
Winbond W78C33 specifications
| Operating Voltage (VDD) | 4.5 V – 5.5 V |
|---|---|
| Operating Current (no load) | ≤ 20 mA |
| Idle Current (VDD = 5.5 V) | ≤ 6 mA |
| Power‑down Current (VDD = 5.5 V) | ≤ 50 µA |
| Input Low Voltage (P0‑P4) | 0 V – 0.8 V (VDD = 4.5 V) |
| Input High Voltage (P0‑P4) | 2.4 V – 5.5 V (VDD = 5.5 V) |
| Output Low Voltage (P1‑P4) | ≤ 0.45 V (IOL = +2 mA) |
| Output High Voltage (P1‑P4) | ≥ 2.4 V (IOH = ‑100 µA) |
All Winbond W78C33 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the operating voltage range of the W78C33B?
The device operates from 4.5 V to 5.5 V.
How many I/O ports does the W78C33B provide?
It has four 8‑bit bidirectional ports and an additional 4‑bit port (Port 4).
What is the maximum operating frequency of the W78C33?
The W78C33 operates up to DC‑40 MHz.
How much on‑chip RAM does the W78C33 provide?
It provides 256 bytes of on‑chip scratchpad RAM.