512 KBIT (64KB X8) UV EPROM AND OTP EPROM The **M27C512** is a **512 Kbit (64K x 8) UV erasable and electrically programmable read-only memory (EPROM)**. Below are its key specifications, descriptions, and features:
### **Manufacturer Specifications:**
- **Memory Capacity:** 512 Kbit (64K x 8)
- **Technology:** UV erasable EPROM
- **Access Time:** Ranges from **120 ns to 250 ns** (depending on variant)
- **Operating Voltage:** **5V ± 10%**
- **Programming Voltage (VPP):** **12.5V** (required for programming)
- **Power Consumption:**
- **Active Current:** 30 mA (typical)
- **Standby Current:** 100 µA (typical)
- **Operating Temperature Range:**
- **Commercial:** 0°C to +70°C
- **Industrial:** -40°C to +85°C
- **Package Options:**
- **Ceramic Windowed (UV erasable):** 28-pin DIP (Dual In-line Package)
- **Plastic OTP (One-Time Programmable):** 28-pin DIP
### **Descriptions:**
- The **M27C512** is a **non-volatile memory** chip that retains data even when power is removed.
- It is **erasable via ultraviolet (UV) light** (windowed ceramic package only) and reprogrammable.
- Data is **programmed electrically** using a **12.5V programming voltage**.
- The chip supports **standard microprocessor interfaces** and is compatible with many legacy systems.
### **Features:**
- **High Reliability:** Endurance of **100 programming cycles** (typical).
- **Low Power Consumption:** Standby mode reduces power usage.
- **Fast Access Time:** Suitable for high-performance applications.
- **CMOS Technology:** Ensures low power and high noise immunity.
- **JEDEC Standard Pinout:** Ensures compatibility with other EPROMs.
- **On-Chip Address and Data Latches:** Simplifies interfacing with microprocessors.
This information is based on the **STMicroelectronics (formerly SGS-Thomson) datasheet** for the **M27C512** EPROM.
