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Microchip Technology 93AA56-I/P
- Part No.:
- 93AA56-I/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
93AA56-I/P.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,224
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Product details
Overview
93AA56-I/P from Microchip Technology is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin. Used in embedded system configuration storage where nonvolatile, byte-serial reprogrammability is required.
For engineers reviewing the 93AA56-I/P datasheet, 93AA56-I/P pinout, 93AA56-I/P application, or 93AA56-I/P equivalent, this page delivers verified electrical specs, package mapping to 8-lead PDIP, functional timing behavior, and real-world use cases in microcontroller-based systems requiring robust, low-power memory retention.
Technical Context
The 93AA56-I/P implements a synchronous serial Microwire protocol with CS/CLK/DI/DO signals and no ORG pin - confirming fixed 8-bit word organization. Its internal architecture includes auto-erase-before-write logic, EWEN/EWDS security control, and hardware-level power-fail protection that inhibits writes below ~1.5 V VCC.
Timing is governed by strict AC parameters: max 3 MHz clock frequency at VCC ≥ 4.5 V, TCKH/TCKL as low as 200/100 ns, and program cycle time of 6 ms for erase/write operations. The DO pin serves dual role - data output during READ and active-low Ready/Busy indicator during programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit = 256 × 8-bit organization; supports single-byte or sequential read/write without external address latching. |
| VCC range | 1.8 V to 5.5 V; enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters. |
| Endurance | 1,000,000 erase/write cycles; ensures >10 years of daily reconfiguration in firmware update or calibration logging applications. |
| Data retention | 200 years at 25°C; guarantees long-term storage integrity for device serial numbers, calibration coefficients, or security keys. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); reduces PCB routing complexity vs. SPI or I²C, with no pull-up resistors needed on DO. |
| Write cycle time | 6 ms typical for erase+write; defines minimum command interval in time-critical boot loaders or real-time parameter saves. |
| Standby current | 1 µA maximum at VCC = 5.5 V; critical for battery-powered IoT nodes where EEPROM quiescent draw impacts shelf life. |
Pinout & Package
8-lead PDIP (P package), through-hole mounting, RoHS-compliant matte tin finish. Pin 1 marked with notch or dot; pin 1 ID confirmed per Microchip DS21794G-page 17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into 1 µA standby mode. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence without corruption. |
| DI (Pin 3) | Data Input | Receives Start bit, instruction opcodes, addresses, and write data; shares no internal path with DO. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read states. |
| VSS (Pin 5) | Ground | Reference for all digital and analog circuitry; requires low-impedance connection to minimize noise coupling into DO timing. |
| NC (Pin 6) | No Connect | Internally unconnected; must remain floating or tied to VSS per design rules - not used for ORG function (A-version). |
| NC (Pin 7) | No Connect | Unused terminal; electrically isolated; PCB trace may be omitted or grounded for mechanical stability only. |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; voltage detect circuit blocks writes below ~1.5 V to prevent partial writes. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond DO status check - simplifies firmware driver implementation. |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data remnants and ensuring deterministic initialization of configuration space. |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC prevents corruption during brown-out or hot-plug events - no software reset sequence required. |
| Ready/Busy status on DO | Enables efficient polling without dedicated status lines; allows multi-device sharing of same DI/DO bus with individual CS control. |
| 1,000,000 endurance cycles | Supports frequent field updates (e.g., energy meter kWh counters, sensor calibration logs) without wear leveling firmware overhead. |
Applications
| Industrial Sensor Node | Medical Device Calibration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and user-adjusted thresholds in a portable blood glucose monitor. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up and clinical mode transitions; retains values across battery swaps. Use Value: Enables traceable, repeatable measurements without recalibration; 200-year retention meets FDA Class II device lifetime requirements. | Use Scenario: Holding unique device ID, firmware version, and usage counter in an infusion pump controller. IC Role / Device Role / Timing Role: Secure boot-time credential store; accessed once per power cycle and updated only during authorized service sessions. Use Value: Supports regulatory audit trails and anti-counterfeiting; 1M-cycle endurance accommodates 10+ years of service log entries. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Recording tariff schedules, demand-response event history, and tamper-detection flags in a DIN-rail electricity meter. IC Role / Device Role / Timing Role: Field-updatable parameter bank; written during utility communication windows and read during billing calculation cycles. Use Value: Eliminates need for external FRAM or backup battery; 1.8 V operation allows direct connection to meter's 3.3 V LDO with margin. | Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in a vehicle door module. IC Role / Device Role / Timing Role: User preference memory mapped to MCU GPIO pins; survives ignition cycling and battery disconnects. Use Value: Delivers OEM-grade personalization without CAN bus bandwidth consumption; –40°C to +85°C rating matches under-hood thermal envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56A-I/P | VCC range 2.5–5.5 V; identical 256 × 8-bit organization, pinout, and instruction set. | Lacks 1.8 V support; unsuitable for ultra-low-voltage systems but offers tighter VIL/VIH thresholds at 3.3 V. | Select when operating exclusively above 2.5 V and higher noise immunity is prioritized over lowest-power operation. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit, 1.8–5.5 V; no Ready/Busy pin - relies on WIP flag polling via STATUS register. | Requires additional GPIO or SPI STATUS read cycle; incompatible Microwire timing and opcode structure. | Choose only if migrating to SPI-based platform architecture; not drop-in replaceable due to protocol and pinout mismatch. |
Compared with 93LC56A-I/P, the 93AA56-I/P extends low-voltage operation to 1.8 V for battery-constrained designs; versus AT25020B-MAHL-T, it offers simpler 3-wire timing and hardware-ready signaling but lacks SPI ecosystem compatibility.
Availability
93AA56-I/P is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, smart energy meters, automotive body control modules, and embedded configuration management requiring stable component supply across extended product lifecycles.
Supply support for 93AA56-I/P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona.
The 93XX series EEPROMs were designed for cost-sensitive, low-power embedded systems needing reliable nonvolatile storage with minimal pin count and firmware overhead - especially in space-constrained or battery-operated applications.
FAQ
What is the memory organization of the 93AA56-I/P?
The 93AA56-I/P has a fixed 256 × 8-bit (2 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and therefore does not support 16-bit word mode. This simplifies interface design for 8-bit microcontrollers and eliminates external configuration logic.
Does the 93AA56-I/P require an external pull-up resistor on the DO pin?
No, the 93AA56-I/P does not require an external pull-up on DO. Its output buffer actively drives high/low during READ and Ready/Busy states, and enters High-Z when inactive. Pull-ups may cause contention and are explicitly discouraged in Microchip's DS21794G.
How is write protection implemented on the 93AA56-I/P?
The 93AA56-I/P uses Erase/Write Enable (EWEN) and Disable (EWDS) commands. It powers up in EWDS mode, blocking all erase/write operations until EWEN is issued. After each write, executing EWDS restores protection - a hardware-enforced safeguard against accidental overwrites.
What is the minimum VCC required for reliable operation of the 93AA56-I/P?
The 93AA56-I/P incorporates a voltage detect circuit that inhibits write operations below approximately 1.5 V. While DC characteristics are specified down to 1.8 V, reliable read/write functionality requires VCC ≥ 1.8 V; operation below this threshold risks data corruption or command failure.
Can the 93AA56-I/P be used in place of the 93C56A-I/P?
No, the 93AA56-I/P is not a direct replacement for the 93C56A-I/P. Although both are 256 × 8-bit EEPROMs, the 93C56A requires VCC ≥ 4.5 V and uses different timing (2 ms write cycle, rising-edge-initiated programming), whereas the 93AA56-I/P operates from 1.8 V and uses falling-edge-initiated programming with 6 ms cycles.
93AA56-I/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8, 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
93AA56-I/P FAQ
1.How can I place an order for 93AA56-I/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56-I/P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 93AA56-I/P reliable?
The price and inventory of 93AA56-I/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA56-I/P is usually 5 days.
3.What payment methods are accepted for 93AA56-I/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56-I/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56-I/P?
93AA56-I/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56-I/P order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 93AA56-I/P?
For technical support, including 93AA56-I/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56-I/P requirements.
6.How does Aetrix verify that 93AA56-I/P is sourced from the original manufacturer or authorized distributors?
All 93AA56-I/P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 93AA56-I/P meets industry standards.
7.What is the process for return or replacement of 93AA56-I/P?
All 93AA56-I/P units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56-I/P, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 93AA56-I/P part is unused and in its original packaging.
Return procedure for 93AA56-I/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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