93C57 - 2K-bit Serial EEPROM

Overview

The 93C57 is a 2K-bit (256 x 8 or 128 x 16) serial Electrically Erasable Programmable Read-Only Memory (EEPROM) designed for applications requiring non-volatile data storage. It operates over a wide voltage range and supports both 8-bit and 16-bit organizations, making it versatile for various embedded systems. The device communicates via a simple 3-wire serial interface (CS, SK, DI/DO), ensuring easy integration into microcontroller-based designs.

Features

• Memory Capacity: 2K-bit organized as 256 x 8 or 128 x 16.
• Serial Interface: 3-wire (CS, SK, DI/DO) Microwire-compatible protocol.
• Wide Voltage Range: Operates from 2.5V to 5.5V, suitable for low-power and battery-powered applications.
• High Endurance: 1,000,000 erase/write cycles per byte.
• Data Retention: 100 years minimum at 25°C.
• Low Power Consumption: Active current of 3mA (max) and standby current of 10µA (max).
• Sequential Read: Supports sequential read operations for faster data access.
• Write Protection: Software and hardware write protection options.
• Temperature Range: Industrial-grade operation (-40°C to +85°C).

Applications

The 93C57 is widely used in embedded systems requiring compact, non-volatile memory storage. Common applications include:

• Automotive electronics (e.g., dashboard configurations, sensor calibration).
• Consumer electronics (e.g., TVs, set-top boxes, smart appliances).
• Industrial control systems (e.g., parameter storage, device configuration).
• Medical devices (e.g., calibration data, user settings).
• Communication equipment (e.g., modems, routers).

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VCC): -0.6V to +6.5V.
• Input Voltage (VI): -0.6V to VCC + 0.6V.
• Operating Temperature (TA): -40°C to +85°C.
• Storage Temperature (TSTG): -65°C to +150°C.

DC Characteristics

• Supply Current (Active): 3mA max at 5V, 1MHz clock.
• Supply Current (Standby): 10µA max.
• Input Leakage Current: ±1µA max.
• Output Leakage Current: ±1µA max.
• Input Low Voltage (VIL): 0.3VCC max.
• Input High Voltage (VIH): 0.7VCC min.

AC Characteristics

• Clock Frequency (fSK): 0 to 2MHz (5V), 0 to 1MHz (2.5V).
• Clock High Time (tSKH): 200ns min.
• Clock Low Time (tSKL): 200ns min.
• Chip Select Setup Time (tCSS): 200ns min.
• Data In Setup Time (tDIS): 100ns min.
• Data In Hold Time (tDIH): 100ns min.
• Output Valid Delay (tPD): 250ns max.

Package Information

The 93C57 is available in multiple industry-standard packages, ensuring compatibility with various PCB layouts and assembly processes.

Package Options

• SOIC-8: Small Outline Integrated Circuit, 8-pin, 150mil body width.
• TSSOP-8: Thin Shrink Small Outline Package, 8-pin, 3mm body width.
• PDIP-8: Plastic Dual In-line Package, 8-pin, 300mil body width.

Pin Configuration

• Pin 1 (CS): Chip Select (active high).
• Pin 2 (SK): Serial Clock Input.
• Pin 3 (DI): Serial Data Input (during write operations).
• Pin 4 (DO): Serial Data Output (during read operations).
• Pin 5 (GND): Ground.
• Pin 6 (ORG): Memory Organization Select (8-bit or 16-bit mode).
• Pin 7 (NC): No Connection.
• Pin 8 (VCC): Power Supply (2.5V to 5.5V).

Functional Description

Memory Organization

The 93C57 can be configured for either 8-bit or 16-bit data organization via the ORG pin. When ORG is tied to VCC, the memory operates in 16-bit mode (128 words x 16 bits). When ORG is tied to GND, it operates in 8-bit mode (256 bytes x 8 bits).

Instruction Set

The device supports the following commands:

• READ: Reads data from a specified address.
• WRITE: Writes data to a specified address.
• ERASE: Erases data at a specified address.
• EWEN: Enable Write/Erase operations.
• EWDS: Disable Write/Erase operations.
• WRAL: Writes data to all addresses.
• ERAL: Erases all memory locations.

Write Protection

The 93C57 includes hardware (via the WP pin) and software (via EWEN/EWDS commands) write protection mechanisms to prevent accidental data corruption.

Conclusion

The 93C57 is a reliable, high-performance serial EEPROM ideal for applications requiring compact, non-volatile memory. Its wide voltage range, low power consumption, and flexible organization make it suitable for diverse embedded systems. With robust electrical characteristics and multiple package options, the 93C57 is a versatile choice for designers.