93C47

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93C47 1K-Bit Serial EEPROM Technical Summary

Overview

The 93C47 is a 1K-bit (128 x 8 or 64 x 16) serial Electrically Erasable Programmable Read-Only Memory (EEPROM) designed for low-power, non-volatile data storage applications. It utilizes a simple 3-wire serial interface for communication with microcontrollers and other digital systems. The device is ideal for applications requiring reliable data retention, low-voltage operation, and compact storage solutions.

This EEPROM features enhanced ESD protection and built-in security mechanisms to ensure data integrity in noisy environments. It is available in multiple package options, including PDIP, SOIC, and TSSOP, making it suitable for a wide range of industrial, automotive, and consumer electronics applications.

Features

• Memory Organization: 128 x 8-bit or 64 x 16-bit configurations
• Serial Interface: 3-wire (CS, SK, DI/DO) Microwire-compatible protocol
• Operating Voltage: 2.5V to 5.5V, supporting low-power designs
• Enhanced ESD Protection: Up to 4000V on all pins for improved reliability
• Write Protection: Software and hardware write-lock options
• High-Speed Clock Frequency: Supports up to 2MHz for fast data transfer
• Low Power Consumption: Active current of 1mA (typical), standby current < 10µA
• Endurance: 1,000,000 write cycles per byte
• Data Retention: 100 years at 25°C
• Glitch Filtering: Built-in noise immunity for stable operation

Applications

The 93C47 is widely used in embedded systems where small amounts of non-volatile memory are required. Key application areas include:

• Automotive Electronics: Storing calibration data, VIN numbers, and system configurations
• Consumer Electronics: Parameter storage in TVs, set-top boxes, and audio equipment
• Industrial Control Systems: Device configuration and calibration data
• Medical Devices: Storing patient settings and usage logs
• Smart Cards & Security Modules: Secure key and parameter storage
• IoT Devices: Network configuration and device identification storage

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VCC): -0.6V to +7.0V
• Input Voltage: -0.6V to VCC + 0.6V
• Operating Temperature Range: -40°C to +85°C (Industrial)
• Storage Temperature Range: -65°C to +150°C

DC Characteristics (VCC = 5V ±10%, TA = 25°C)

• Supply Current (Read): 1mA (max)
• Supply Current (Write): 3mA (max)
• Standby Current: 10µA (max)
• Input Low Voltage: 0.3VCC (max)
• Input High Voltage: 0.7VCC (min)
• Output Low Voltage (IOL = 2.1mA): 0.4V (max)
• Output High Voltage (IOH = -400µA): VCC - 0.4V (min)

AC Characteristics

• Clock Frequency: 0 to 2MHz
• Clock High Time: 250ns (min)
• Clock Low Time: 250ns (min)
• Chip Select Setup Time: 250ns (min)
• Data In Setup Time: 150ns (min)
• Data In Hold Time: 50ns (min)
• Output Valid from Clock: 200ns (max)
• Write Cycle Time: 5ms (max)

Package Information

The 93C47 is available in multiple industry-standard packages:

8-Pin Packages

• PDIP-8 (Plastic Dual In-line Package):
  • Body Size: 9.81mm x 6.35mm
  • Lead Pitch: 2.54mm
  • Package Code: P8
• SOIC-8 (Small Outline Integrated Circuit):
  • Body Size: 5.00mm x 4.00mm
  • Lead Pitch: 1.27mm
  • Package Code: S8
• TSSOP-8 (Thin Shrink Small Outline Package):
  • Body Size: 3.00mm x 3.00mm
  • Lead Pitch: 0.65mm
  • Package Code: T8

Pin Configuration (PDIP-8)

• Pin 1: Chip Select (CS)
• Pin 2: Serial Clock (SK)
• Pin 3: Data Input (DI)
• Pin 4: Data Output (DO)
• Pin 5: Ground (GND)
• Pin 6: NC (No Connection)
• Pin 7: NC (No Connection)
• Pin 8: Supply Voltage (VCC)

Functional Description

The 93C47 communicates via a simple 3-wire serial interface consisting of Chip Select (CS), Serial Clock (SK), and bidirectional Data (DI/DO) lines. The device supports both 8-bit and 16-bit word organizations, selected via the ORG pin or software command.

Key operational modes include:

• Read: Retrieves data from specified memory address
• Write: Programs data to specified memory address
• Write Enable/Disable: Protects memory from accidental writes
• Erase: Clears data at specified address
• Erase All: Clears entire memory array
• Write All: Programs all locations with same data

The device incorporates advanced write protection features including both hardware and software controlled protection mechanisms to prevent accidental data corruption. An internal timer automatically terminates write operations after the maximum write time has elapsed, ensuring data integrity even in the event of system crashes or power failures.

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