My Inquiry
My Account
Microchip Technology 93AA56AT-I/ST
- Part No.:
- 93AA56AT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA56AT-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93AA56AT-I/ST 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 grade (−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 via DO pin - deployed in embedded microcontroller systems for parameter storage and calibration data retention.
For engineers reviewing the 93AA56AT-I/ST datasheet, 93AA56AT-I/ST pinout, 93AA56AT-I/ST application, or 93AA56AT-I/ST equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), TSSOP-8 package, 1 million erase/write endurance, >200-year data retention, and compatibility with legacy Microwire controllers in space-constrained industrial control modules.
Technical Context
The 93AA56AT-I/ST implements a synchronous serial Microwire protocol with CS, CLK, and DI/DO pins. It operates without an ORG pin, fixing memory organization to 256 words × 8 bits. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are initiated by a Start bit followed by opcode, address, and data on the rising edge of CLK.
Internal logic includes power-on reset detection (VPOR = 1.5 V), automatic erase-before-write, and hardware-based write protection via EWEN/EWDS commands. The DO pin serves dual function: serial data output during READ and Ready/Busy status indicator during programming - requiring CS reassertion after TCSL ≥ 250 ns to sample status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit); fixed x8 organization - no external ORG pin required, simplifying PCB layout and firmware initialization. |
| Supply Voltage | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - enables frequent field-updatable configuration storage in industrial logging applications. |
| Data Retention | >200 years at +25°C - ensures long-term reliability for calibration constants and device identity in unattended equipment. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals and minimal GPIO usage. |
| Access Time | TPD ≤ 400 ns (VCC = 1.8 V, CL = 100 pF) - meets timing budgets for high-speed polling in real-time control loops. |
| Write Cycle Time | TWC = 6 ms (erase + write) - deterministic latency allows precise scheduling of nonvolatile updates without blocking main application flow. |
Pinout & Package
93AA56AT-I/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, Pb-free Matte Tin finish. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby mode but completes ongoing write cycle. |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers on rising edge; clock can be paused mid-sequence; no clock required during self-timed write. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and write data; tied high with CS and CLK to detect Start condition. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low; requires CS reassertion to sample status. |
| 5 (VSS) | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance connection for stable erase/write operation. |
| 6 (NC) | No Internal Connection | Unbonded pin; must be left floating or tied to VSS per layout best practice - no functional role in 93AA56A variant. |
| 7 (NC) | No Internal Connection | Unbonded pin; identical to Pin 6 - no routing or termination required. |
| 8 (VCC) | Power Supply | 1.8–5.5 V input; internal voltage detector (VPOR = 1.5 V) blocks writes below threshold to prevent corruption. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or software delays - internal state machine manages auto-erase and programming in fixed 6 ms window. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial writes and data corruption without firmware intervention. |
| Power-On/Off Data Protection | Hardware lockout below VPOR = 1.5 V prevents inadvertent writes during brown-out or power ramp - no external supervisor IC required. |
| Ready/Busy via DO pin | Enables efficient polling instead of fixed delay waits; reduces CPU overhead and improves system responsiveness during nonvolatile updates. |
| Sequential Read Mode | Allows continuous reading across memory addresses with single CS assertion - cuts transaction overhead by ~40% vs. individual address reads. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted calibration parameters in portable gas analyzers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at boot and during field recalibration; interfaces directly with 3.3 V ARM Cortex-M0+ MCU via Microwire peripheral. Use Value: 1M endurance supports daily recalibration over 10+ years; >200-year retention preserves baseline accuracy across product lifetime. | Use Scenario: Holding patient-specific therapy settings, device serial number, and firmware version history in battery-powered infusion pumps. IC Role / Device Role / Timing Role: Secure configuration vault with hardware write protection (EWEN/EWDS); accessed only during setup or update routines. Use Value: Power-loss immunity ensures therapy continuity; 1.8 V operation extends battery life in low-power sleep modes. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: Recording door lock/unlock event counters, mirror position memory, and lighting timeout preferences in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Robust parameter EEPROM interfaced through discrete GPIO bit-banging due to absence of Microwire peripheral on 8-bit MCU. Use Value: −40°C to +85°C rating ensures reliability under hood temperature cycling; 5.5 V max VCC tolerates load-dump transients. | Use Scenario: Storing tariff schedules, meter ID, tamper logs, and accumulated kWh values in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Long-life data logger with periodic write bursts synchronized to zero-crossing detection. Use Value: 6 ms write time aligns with AC cycle timing windows; 1.8 V min VCC enables operation during brown-out conditions. |
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/ST | VCC range 2.5–5.5 V; otherwise identical pinout, instruction set, and 256 × 8-bit organization. | Not suitable for 1.8 V systems; requires minimum 2.5 V - excludes ultra-low-power or mixed-voltage designs. | Select when system VCC is guaranteed ≥2.5 V and higher noise immunity at VCC ≥2.5 V is preferred. |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, 20 MHz max clock; no Ready/Busy pin - relies on WIP flag polling. | Requires SPI controller instead of Microwire; lacks hardware-ready signal - increases firmware complexity for timing-critical updates. | Select when migrating to SPI-based platforms or when higher throughput (vs. Microwire's ~3 MHz max) is required. |
Compared with 93LC56AT-I/ST, the 93AA56AT-I/ST enables 1.8 V operation critical for energy harvesting nodes, while versus AT25020B-SSHL-T it retains simpler 3-wire control and deterministic Ready/Busy signaling - reducing firmware validation effort in cost-sensitive industrial designs.
Availability
93AA56AT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA56AT-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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX series EEPROMs were designed specifically for reliable, low-power, pin-efficient nonvolatile storage in resource-constrained embedded systems - emphasizing robustness across voltage and temperature extremes without external support components.
FAQ
What is the memory organization of the 93AA56AT-I/ST?
The 93AA56AT-I/ST has a fixed 256 × 8-bit (2 Kbit) organization with no ORG pin. Unlike 'C' variants, it does not support word-size selection - eliminating external logic and simplifying firmware handling of address/data width. This matches the 'A' suffix designation in Microchip's 93XX56 family nomenclature.
Does the 93AA56AT-I/ST require an external pull-up resistor on the DO pin?
No, the 93AA56AT-I/ST does not require an external pull-up on DO. The pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when CS is low. A pull-up may cause bus contention if DI and DO are shorted - Microchip recommends a series resistor if shared-line topology is used.
Can the 93AA56AT-I/ST be used with a 1.8 V microcontroller?
Yes, the 93AA56AT-I/ST supports 1.8 V operation across its full Industrial temperature range (−40°C to +85°C). Its VIH1 threshold is 2.0 V at VCC ≥ 2.7 V, but VIH2 drops to 0.7 × VCC - ensuring reliable recognition of 1.8 V logic highs when VCC = 1.8 V. This makes it compatible with modern ultra-low-power MCUs.
How is write protection implemented on the 93AA56AT-I/ST?
Write protection on the 93AA56AT-I/ST uses hardware-enabled EWEN/EWDS commands. The device powers up in EWDS (Erase/Write Disable) mode. An EWEN instruction must precede any ERASE or WRITE; subsequent EWDS disables further writes. This prevents accidental overwrites during power transitions or firmware glitches - no external hardware is needed.
What package type is used for the 93AA56AT-I/ST?
93AA56AT-I/ST uses an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, marked "ST" in Microchip's package code table. It is Pb-free (Matte Tin), RoHS-compliant, and rated for Industrial temperature operation. Pin 1 is laser-marked; NC pins (6 and 7) must remain unconnected.
93AA56AT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 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
93AA56AT-I/ST FAQ
1.How can I place an order for 93AA56AT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56AT-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 93AA56AT-I/ST reliable?
The price and inventory of 93AA56AT-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 93AA56AT-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA56AT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56AT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56AT-I/ST?
93AA56AT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56AT-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 93AA56AT-I/ST?
For technical support, including 93AA56AT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56AT-I/ST requirements.
6.How does Aetrix verify that 93AA56AT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA56AT-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 93AA56AT-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA56AT-I/ST?
All 93AA56AT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56AT-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 93AA56AT-I/ST part is unused and in its original packaging.
Return procedure for 93AA56AT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA56AT-I/ST Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
