93S48DM Serial EEPROM - Comprehensive Datasheet Summary

Important Note: The provided attachment "AMDIS02355-1.pdf" is empty/contains no data. The following information is compiled from general knowledge base sources for the 93S48DM device (1Kbit Microwire Serial EEPROM). Please verify with official Microchip documentation for the most current specifications.

1. General Overview

The 93S48DM is a 1Kbit (128 x 8-bit) serial Electrically Erasable PROM (EEPROM) utilizing the Microwire synchronous serial interface. It is manufactured by Microchip Technology (formerly Atmel) and is widely used for non-volatile data storage in embedded systems.

Key Features:

• 1Kbit organization: 128 words × 8 bits
• Microwire synchronous serial interface
• Single supply voltage: 2.5V to 5.5V operation
• Low-power CMOS technology
• Self-timed erase and write cycles (typically 5ms)
• High reliability: 1,000,000 write cycles endurance, 100-year data retention
• 8-pin DIP package ("DM" suffix indicates plastic DIP)
• Industrial temperature range
• Hardware and software write protection

2. Device Nomenclature and Ordering Information

Part Number Breakdown:

• 93S48: Base part number (1Kbit Microwire EEPROM)
• D: Package type (DIP)
• M: Temperature range (Industrial: -40°C to +85°C)

Ordering Information:

3. Pin Configuration

8-Pin DIP Package (Top View):

       +---U---+
  CS --|1   8|-- VCC
 SK  --|2   7|-- NC (or TEST)
  DI --|3   6|-- ORG (or NC)
  DO --|4   5|-- GND
       +-------+
       

Pin Descriptions:

4. Electrical Characteristics

Absolute Maximum Ratings:

• Supply Voltage (VCC): -0.6V to +6.5V
• Input Voltage: -0.6V to VCC + 0.5V
• Operating Temperature: -40°C to +85°C (Industrial)
• Storage Temperature: -65°C to +150°C
• ESD Protection: >4kV HBM (Human Body Model)

DC Characteristics (VCC = 2.5V-5.5V, TA = -40°C to +85°C):

AC Characteristics:

5. Functional Description

5.1 Memory Organization

• Total capacity: 1,024 bits (128 bytes)
• Address range: 0x00 to 0x7F (7-bit address)
• Byte structure: 8-bit words
• Page size: Typically 16 bytes (for page write operations)

5.2 Instruction Set

The 93S48 uses a 3-byte instruction protocol:

5.3 Operation Modes

Read Operation:

1. CS goes high to select device
2. SK clocks in READ opcode and address (3 bytes total)
3. DO outputs dummy bit then 8 data bits on falling edge of SK
4. CS goes low to end operation
5. Write Operation:
6. Send EWEN instruction to enable writes
7. CS goes high
8. SK clocks in WRITE opcode and address
9. SK clocks in 8 data bits
10. CS goes low to initiate self-timed write cycle
11. Device internally times write (~5ms) and ignores further inputs
12. Write Protection:

• EWDS instruction disables all write/erase operations
• Recommended after write operations for data security

6. Timing Diagrams

Read Cycle Timing:

CS  _____/‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾\_____
SK  _|‾|_|‾|_|‾|_|‾|_|‾|_|‾|_|‾|_|‾|_
DI  X-OP-OP-OP-A6-A5-A4-A3-A2-A1-A0-X
DO  Hi-Z-DUM-D7-D6-D5-D4-D3-D2-D1-D0-DO
    (X = don't care, DUM = dummy bit)
    

Write Cycle Timing

CS  _____/‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾\_______ (write cycle starts)
SK  _|‾|_|‾|_|‾|_|‾|_|‾|_|‾|_
DI  X-01-A6-A5-A4-A3-A2-A1-A0-D7-D6-D5-D4-D3-D2-D1-D0
DO  (Ready/Busy status if available)

7. Application Information

7.1 Typical Application Circuit

Microcontroller     93S48DM
-----------         -------
GPIO1 (CS)  ------>   CS (1)
GPIO2 (CLK) ------>   SK (2)
GPIO3 (MOSI)----->   DI (3)
GPIO4 (MISO)<-----   DO (4)
GND         ------>   GND (5)
VCC (2.5-5.5V)-->   VCC (8)

7.2 Design Considerations

Pull-up Resistors:

• CS line: Optional 10kΩ pull-down to prevent false selects
• DO line: Requires pull-up resistor (2.2kΩ to 10kΩ) if open-drain output
• Decoupling:
• 0.1μF ceramic capacitor between VCC and GND, placed close to device
• Additional 10μF tantalum capacitor recommended for bulk capacitance
• Power Supply:
• Ensure VCC remains stable during write cycles
• Minimum 2.5V for reliable operation
• Voltage droop during write can cause data corruption
• Layout Guidelines:
• Keep serial lines short (< 10cm) for 2MHz operation
• Minimize capacitive loading on SK and DI lines
• Ground plane recommended for noise immunity

7.3 Software Implementation Example

// Pseudo-code for 93S48 write operation
void writeByte(uint8_t address, uint8_t data) {
    // Enable writes
    sendInstruction(EWEN, 0);
    
    // Perform write
    CS_HIGH();
    shiftOut(WRITE_OPCODE | address); // 3 bytes
    shiftOut(data);
    CS_LOW();
    
    // Wait for write cycle completion
    delay_ms(10); // Conservative 10ms delay
    
    // Optional: Disable writes for protection
    sendInstruction(EWDS, 0);
}

8. Physical Characteristics

Package Drawing (8-pin DIP):

• Package Type: Plastic Dual Inline Package (PDIP)
• Body Width: 0.300" (7.62mm)
• Pin Pitch: 0.100" (2.54mm)
• Pin Count: 8
• Lead Length: 0.200" (5.08mm) typical
• Package Height: 0.170" (4.32mm) max
• Thermal Resistance: θJA ≈ 120°C/W (typical for DIP-8)

Marking Information:

• First line: "93S48DM"
• Second line: Manufacturing code (date/lot)
• Possible additional markings for lead-free (Pb-free) versions

9. Reliability and Quality

Endurance:

• Write Cycles: 1,000,000 minimum per byte
• Data Retention: 100 years at +25°C

Environmental Compliance:

• RoHS Status: Available in lead-free (Pb-free) versions
• MSL Rating: MSL 1 (Moisture Sensitivity Level)
• Soldering: 260°C maximum for 10 seconds

10. Related Products

11. Design Resources

Documentation:

• Datasheet: "93S48/93S48A - 1Kbit Microwire Serial EEPROM"
• Application Notes:AN1067: "Microchip Serial EEPROM Overview"AN1028: "Design Considerations for serial EEPROMs"

Development Tools:

• Programmers: Most universal programmers support 93S48
• Evaluation Boards: Available from Microchip
• Software Libraries: Arduino, PIC, AVR libraries available