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Microchip Technology 93AA56CT-I/SN
- Part No.:
- 93AA56CT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA56CT-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,939
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Product details
Overview
93AA56CT-I/SN from Microchip Technology Inc. is a 2 Kbit low-voltage serial EEPROM with 256 × 8-bit organization, supporting Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), 1.8–5.5 V supply, and industrial temperature range (–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 and sensor calibration retention.
For engineers reviewing the 93AA56CT-I/SN datasheet, 93AA56CT-I/SN pinout, 93AA56CT-I/SN application, or 93AA56CT-I/SN equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), SOIC-8 package footprint, 8-bit word organization (no ORG pin function), 1 million endurance cycles, and 200-year data retention - critical for long-life industrial firmware parameter storage.
Technical Context
The 93AA56CT-I/SN implements a synchronous serial Microwire interface with start-bit detection, opcode-driven command set (READ/ WRITE/ERASE/ERAL/WRAL/EWEN/EWDS), and internal auto-erase-before-write logic. Its memory array is organized as 256 words × 8 bits, fixed by device variant ('A' suffix), eliminating external ORG pin dependency.
It uses CMOS technology with on-chip power-on reset (VPOR = 1.5 V typical) and integrated write-protection circuitry: powers up in EWDS mode, requiring explicit EWEN before programming; supports sequential read and status polling via DO pin during erase/write operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit organization, fixed - no ORG pin) |
| Supply voltage | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifting |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI, DO) - minimal GPIO usage, no SPI mode bits required |
| Endurance | 1,000,000 erase/write cycles - supports frequent field-updatable configuration logging |
| Data retention | Greater than 200 years at 25°C - ensures lifetime data integrity in unpowered storage |
| Operating temp | –40°C to +85°C (Industrial grade) - validated for use in factory automation and outdoor metering |
| Write time | 6 ms max per byte/word (TWC) - deterministic timing for real-time firmware state saves |
Pinout & Package
93AA56CT-I/SN is packaged in 8-lead SOIC (SN) with standard 150-mil width. Pin 1 is CS (Chip Select), Pin 2 is CLK (Serial Clock), Pin 3 is DI (Data In), Pin 4 is DO (Data Out), Pin 5 is VSS (Ground), Pin 6 is NC (No internal connection - ORG not implemented in 'A' version), Pin 7 is NC (No internal connection), and Pin 8 is VCC (Power Supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select input | Active-high enable: must be held high ≥250 ns between instructions; falling edge initiates self-timed write/erase on 93AA devices |
| 2 - CLK | Serial clock input | Rising-edge synchronized I/O; clock can be paused mid-transfer; TCKH/TCKL vary with VCC (e.g., 200 ns min at 4.5–5.5 V) |
| 3 - DI | Serial data input | Accepts start bit, opcode, address, and write data; requires stable setup/hold times relative to CLK (TDIS/TDIH) |
| 4 - DO | Serial data output / status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status read |
| 5 - VSS | Ground reference | Return path for all I/O and core logic; must be low-impedance for reliable timing and noise immunity |
| 6 - NC | No internal connection | Unused pad - must be left floating or tied to VSS per layout best practice; ORG functionality absent in 'A' version |
| 7 - NC | No internal connection | Unused pad - no internal bond; electrically isolated; no routing or termination required |
| 8 - VCC | Power supply | Supplies core and I/O; includes internal POR (1.5 V threshold); decoupling capacitor (0.1 µF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - internal logic manages full auto-erase-before-write sequence in ≤6 ms |
| Automatic ERAL before WRAL | Ensures clean memory state prior to bulk write - no separate ERAL command needed, reducing firmware complexity |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V - prevents corruption during brown-out or hot-plug events |
| Ready/Busy status via DO | Enables non-blocking polling - firmware reads DO while CS high to determine completion without fixed delays |
| Sequential read mode | Allows continuous address increment with CS held high - reduces transaction overhead for block reads (e.g., calibration tables) |
Applications
| Industrial Sensor Calibration | Embedded Firmware Parameter Storage |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at boot and during field recalibration via MCU's GPIO-driven Microwire interface. Use Value: 200-year retention and 1M endurance ensure coefficient integrity across 10+ year product lifecycles without refresh. | Use Scenario: Holding user-configurable settings (baud rate, network ID, alarm thresholds) in HVAC controller firmware. IC Role / Device Role / Timing Role: Dedicated 8-bit serial EEPROM interfaced to 8-bit MCU with limited SPI peripherals - leverages minimal 4-pin Microwire bus. Use Value: 1.8–5.5 V operation allows direct connection to both 3.3 V and 5 V controller rails, eliminating level-shifter BOM cost. |
| Smart Meter Tamper Log | Medical Device Configuration Backup |
Use Scenario: Recording timestamped tamper events (cover removal, magnetic interference) in utility meters with battery backup. IC Role / Device Role / Timing Role: Low-power nonvolatile memory storing event logs; accessed only during wake-up interrupts to minimize energy use. Use Value: 1 µA standby current (ICCS) and 1.8 V minimum VCC enable operation from coin-cell backup for >5 years. | Use Scenario: Retaining safety-critical calibration and operational limits for infusion pump motor drivers after power cycle. IC Role / Device Role / Timing Role: Certified configuration store - data written once at manufacturing and read at every power-on reset. Use Value: Industrial temperature rating (–40°C to +85°C) and AEC-Q200-aligned reliability support Class II medical device environmental validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56AT-I/SN | VCC range 2.5–5.5 V; identical 256 × 8-bit organization and SOIC-8 package; same instruction set and timing | Not suitable for 1.8 V systems; requires minimum 2.5 V - excludes ultra-low-power or mixed-voltage designs | Select if system operates ≥2.5 V and legacy 93LC family qualification is required |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, SOIC-8; no Ready/Busy pin - relies on WIP flag polling | Lacks dedicated DO-status signaling; requires different driver code and may increase software latency during writes | Select if SPI-native MCU is used and firmware already supports Atmel's status register model |
Compared with 93LC56AT-I/SN, the 93AA56CT-I/SN supports lower-voltage operation down to 1.8 V, enabling direct integration into energy-harvesting or battery-powered nodes; versus AT25020B-MAHL-T, it offers hardware Ready/Busy signaling for deterministic timing control without status register reads.
Availability
93AA56CT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded firmware parameter storage, and smart meter tamper log applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA56CT-I/SN 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX series EEPROMs were designed for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal pin count and simple firmware drivers - targeting industrial controls, consumer appliances, and automotive subsystems.
FAQ
What is the memory organization of the 93AA56CT-I/SN?
The 93AA56CT-I/SN has a fixed 256 × 8-bit organization (2 Kbit total), as indicated by the 'A' suffix in its part number. Unlike 'C' variants, it does not feature an ORG pin - the word size is permanently configured for 8-bit access. This eliminates external configuration logic and simplifies PCB layout for systems requiring byte-oriented storage.
Does the 93AA56CT-I/SN require an external pull-up resistor on the DO pin?
No, the 93AA56CT-I/SN does not require an external pull-up on DO. The DO pin actively drives high/low during read or status polling and enters High-Z when deselected (CS low) or idle. However, if DI and DO are shorted (shared bus), a 10 kΩ series resistor is recommended to prevent bus conflict during dummy-zero read phases.
What is the maximum clock frequency supported by the 93AA56CT-I/SN at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93AA56CT-I/SN supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1). This is confirmed for 93AA/93LC devices at 2.5 V ≤ VCC < 5.5 V. Exceeding this frequency risks setup/hold violations and unreliable communication.
How does write protection work on the 93AA56CT-I/SN?
The 93AA56CT-I/SN powers up in Erase/Write Disable (EWDS) mode. Before any ERASE or WRITE command, an EWEN instruction must be issued. After programming, executing EWDS re-enables hardware write protection. This two-step enable/disable mechanism prevents accidental overwrites during noise events or firmware glitches.
Is the 93AA56CT-I/SN compatible with standard SPI interfaces?
No, the 93AA56CT-I/SN is not SPI-compatible. It uses a Microwire-compatible 3-wire interface (CS/CLK/DI/DO) with start-bit detection and proprietary opcodes - distinct from SPI's CPOL/CPHA framing and command structure. Direct connection to SPI peripherals requires bit-banged GPIO control or protocol translation.
93AA56CT-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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:
- 3 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93AA56CT-I/SN FAQ
1.How can I place an order for 93AA56CT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56CT-I/SN 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 93AA56CT-I/SN reliable?
The price and inventory of 93AA56CT-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA56CT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA56CT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56CT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56CT-I/SN?
93AA56CT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56CT-I/SN 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 93AA56CT-I/SN?
For technical support, including 93AA56CT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56CT-I/SN requirements.
6.How does Aetrix verify that 93AA56CT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA56CT-I/SN 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 93AA56CT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA56CT-I/SN?
All 93AA56CT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56CT-I/SN, 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 93AA56CT-I/SN part is unused and in its original packaging.
Return procedure for 93AA56CT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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