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Microchip Technology 93AA56C-I/ST
- Part No.:
- 93AA56C-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA56C-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
93AA56C-I/ST from Microchip Technology is a 2 Kbit low-voltage serial EEPROM with user-selectable 8-bit or 16-bit word organization via the ORG pin, operating across 1.8–5.5 V, rated for -40°C to +85°C industrial temperature range, and packaged in an 8-lead TSSOP (ST). It implements Microwire-compatible 3-wire serial interface with Ready/Busy status reporting and supports self-timed erase/write cycles.
For engineers reviewing the 93AA56C-I/ST datasheet, 93AA56C-I/ST pinout, 93AA56C-I/ST application, or 93AA56C-I/ST equivalent, key selection considerations include VCC voltage range compatibility, ORG pin configuration for memory width, industrial temperature operation, TSSOP package footprint, and support for sequential read and automatic ERAL/WRAL functions.
Technical Context
The 93AA56C-I/ST uses a synchronous 3-wire Microwire interface with CS, CLK, and DI/DO lines, where instruction execution begins on detection of a Start condition (CS high and DI high on CLK rising edge). Memory organization is dynamically selected: ORG = VSS enables 256 × 8-bit mode; ORG = VCC enables 128 × 16-bit mode.
It features hardware-based power-on/off data protection, automatic erase-before-write, and dedicated EWEN/EWDS commands to prevent accidental programming. The DO pin serves dual function - serial data output during READ and Ready/Busy status indicator during erase/write operations - requiring CS to be pulsed high after TCSL ≥ 250 ns to sample status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit or 128 × 16-bit, selectable via ORG pin) |
| VCC range | 1.8 V to 5.5 V - supports single-supply operation in battery-powered and mixed-voltage systems |
| Temperature grade | Industrial (-40°C to +85°C) - validated for embedded control and instrumentation environments |
| Write endurance | 1,000,000 erase/write cycles - ensures long-term reliability in firmware parameter storage |
| Data retention | Greater than 200 years at 25°C - suitable for nonvolatile configuration storage without refresh |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal pin count, compatible with legacy microcontrollers |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - enables fast configuration loading in time-critical boot sequences |
Pinout & Package
8-lead TSSOP (ST) package with exposed pad (not connected per datasheet), RoHS-compliant matte tin finish, 3.0 mm × 4.4 mm body, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must remain low ≥250 ns between instructions; initiates self-timed write on falling edge (93AA series) |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; shares net with DO only with external current-limiting resistor |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status polling |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection |
| 6 (ORG) | Organization select | Logic high → 128×16-bit; logic low → 256×8-bit; must be externally biased, not floating |
| 7 (NC) | No internal connection | Not bonded; leave unconnected; no pull-up/down required |
| 8 (VCC) | Power supply | Supplies core and I/O; internal POR triggers at ~1.5 V; requires local 0.1 µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| ORG pin configuration | Enables field-selectable memory width (8-bit or 16-bit) without changing BOM or layout |
| Self-timed erase/write | Eliminates need for external timing control or software delays during programming |
| Automatic ERAL before WRAL | Guarantees full-array write integrity without separate erase command sequence |
| Ready/Busy status on DO | Allows polling-based flow control instead of fixed delay loops, improving system responsiveness |
| Power-on/off data protection | Hardware lockout below ~1.5 V prevents corruption during brown-out or power ramp |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in HVAC controllers and pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with infrequent writes and frequent reads; accessed during power-up initialization. Use Value: Enables one-time calibration in production and field recalibration without firmware update; 200-year retention ensures lifetime validity. | Use Scenario: Holding user-configurable settings (network ID, display brightness, alarm thresholds) in medical infusion pumps. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to MCU GPIOs; updated only on menu save action. Use Value: Low-pin-count Microwire interface conserves MCU resources; 1M endurance supports >1000 field adjustments over product life. |
| Automotive Subsystem Logging | Consumer Appliance State Memory |
Use Scenario: Recording fault codes and runtime counters in body control modules (BCM) for diagnostic services. IC Role / Device Role / Timing Role: Event-triggered write storage; accessed via CAN-attached microcontroller using discrete GPIO bit-banging. Use Value: Industrial temp rating (-40°C to +85°C) meets under-hood ambient requirements; 1.8 V operation supports low-power sleep modes. | Use Scenario: Retaining cooking program history and door-open event timestamps in smart ovens. IC Role / Device Role / Timing Role: Standalone EEPROM interfaced to 8-bit MCU with limited SPI peripherals; used for persistent state backup. Use Value: TSSOP-8 package fits compact control board layouts; 3-wire interface avoids SPI resource contention with display/touch drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56C-I/ST | Same pinout and ORG functionality, but 2.5–5.5 V VCC range (no 1.8 V support) | Not suitable for 1.8 V systems; otherwise identical use cases | Select if system VCC ≥ 2.5 V and lower quiescent current at mid-range voltages is prioritized |
| 93AA56C-I/SN | Identical electrical specs and ORG behavior, but in 8-lead SOIC (SN) package | Requires PCB footprint change; SOIC offers easier hand-soldering and test probe access | Select for prototyping, repair, or legacy board compatibility where TSSOP reflow is unavailable |
Compared with 93LC56C-I/ST, the 93AA56C-I/ST extends low-voltage operation down to 1.8 V for battery-backed systems; compared with 93AA56C-I/SN, it delivers the same functionality in a space-saving TSSOP package ideal for high-density consumer PCBs.
Availability
93AA56C-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive subsystem logging requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 93AA56C-I/ST 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX56 family was designed specifically for cost-sensitive, low-power serial EEPROM applications in industrial, automotive, and consumer electronics where Microwire compatibility, flexible word width, and robust data retention are essential.
FAQ
What is the function of the ORG pin on the 93AA56C-I/ST?
The ORG pin on the 93AA56C-I/ST selects memory organization: tied to VCC, it configures the device as 128 × 16-bit; tied to VSS, it configures as 256 × 8-bit. This pin is not present on A/B variants and must be externally biased-floating is prohibited. The 93AA56C-I/ST datasheet confirms this behavior applies across its full 1.8–5.5 V operating range.
Does the 93AA56C-I/ST support sequential read operations?
Yes, the 93AA56C-I/ST supports sequential read: when CS remains high after a READ instruction, the internal address counter automatically increments, and subsequent data bits stream out on DO without retransmitting the address. This feature reduces host MCU overhead and is confirmed in Section 2.7 of the 93AA56C-I/ST datasheet.
What is the minimum VCC required for reliable operation of the 93AA56C-I/ST?
The 93AA56C-I/ST requires a minimum VCC of 1.8 V for guaranteed operation across its industrial temperature range (-40°C to +85°C). Its internal power-on reset (POR) circuit activates at approximately 1.5 V, but functional operation-including valid read/write-is specified only from 1.8 V upward per DS21794G-page 4, Table 1-1.
How does the Ready/Busy status work on the 93AA56C-I/ST DO pin?
During erase or write cycles, the DO pin of the 93AA56C-I/ST outputs Ready/Busy status: logic low indicates ongoing programming; logic high indicates completion. To sample this, CS must be brought high for ≥250 ns after TCSL, then monitored on subsequent CLK edges. This behavior is explicitly defined in Section 2.4 and Figure 2-1 of the 93AA56C-I/ST datasheet.
Is the 93AA56C-I/ST pin-compatible with other 93XX56 variants in TSSOP packaging?
Yes, the 93AA56C-I/ST is pin-compatible with 93LC56C-I/ST and 93C56C-I/ST in the 8-lead TSSOP (ST) package, sharing identical pinout, footprint, and mechanical dimensions. However, VCC range and POR threshold differ: 93AA56C-I/ST operates from 1.8 V, while 93LC56C-I/ST starts at 2.5 V and 93C56C-I/ST at 4.5 V.
93AA56C-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- 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:
- 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-TSSOP
93AA56C-I/ST FAQ
1.How can I place an order for 93AA56C-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56C-I/ST 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 93AA56C-I/ST reliable?
The price and inventory of 93AA56C-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA56C-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA56C-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56C-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56C-I/ST?
93AA56C-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56C-I/ST 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 93AA56C-I/ST?
For technical support, including 93AA56C-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56C-I/ST requirements.
6.How does Aetrix verify that 93AA56C-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA56C-I/ST 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 93AA56C-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA56C-I/ST?
All 93AA56C-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56C-I/ST, 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 93AA56C-I/ST part is unused and in its original packaging.
Return procedure for 93AA56C-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA56C-I/ST Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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