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Microchip Technology 93C56CT-E/ST
- Part No.:
- 93C56CT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C56CT-E/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,097
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Product details
Overview
93C56CT-E/ST from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial-temperature operation (–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 calibration data retention.
For engineers reviewing the 93C56CT-E/ST datasheet, 93C56CT-E/ST pinout, 93C56CT-E/ST application, or 93C56CT-E/ST equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), 2 ms typical write cycle time, TSSOP-8 package, and compatibility with legacy Microwire controllers in space-constrained industrial control modules.
Technical Context
The 93C56CT-E/ST implements a synchronous serial interface with CS, CLK, and DI/DO pins, requiring a Start bit detection sequence before instruction execution. Its internal logic supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS commands - all clocked on rising CLK edges, with DO providing status feedback during programming.
Unlike C-variant parts, this A-version device lacks an ORG pin and is permanently configured for 256 × 8-bit organization. Erase/write operations are initiated by the rising edge of CLK on the final data bit (93C-series behavior), and VCC must remain ≥4.5 V for ERAL and WRAL functions to operate correctly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin required |
| VCC range | 4.5 V to 5.5 V - incompatible with 3.3 V or 2.5 V systems without level shifting |
| Write cycle time | 2 ms max - enables fast field updates without blocking host MCU for extended periods |
| Endurance | 1,000,000 erase/write cycles - supports frequent recalibration or logging in industrial equipment |
| Data retention | 200 years at 25°C - ensures long-term reliability in unattended infrastructure devices |
| Operating temp | –40°C to +85°C - qualified for industrial environments without derating |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware |
Pinout & Package
93C56CT-E/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 |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clocking stops during self-timed write; no minimum duty cycle requirement |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; high-impedance when not selected |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; requires low-inductance connection to minimize noise |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (ORG) | Organization | Not bonded - device is A-version; pin is NC and must not be driven |
| 8 (VCC) | Power Supply | 4.5–5.5 V only; internal POR triggers at ~3.8 V; decoupling capacitor required within 1 cm |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC (2 ms), simplifying firmware |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write, preventing partial-write corruption on power loss |
| Power-on/off data protection | Hardware lockout below ~3.8 V prevents inadvertent writes during brown-out or startup transients |
| Ready/Busy status on DO | Enables efficient polling instead of fixed-delay waits, reducing average write latency in real-time systems |
| 1,000,000 endurance cycles | Supports daily reconfiguration over 27+ years - suitable for firmware update staging or dynamic parameter tuning |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, PID coefficients, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed infrequently during commissioning or maintenance; retains values across AC power cycles. Use Value: Ensures deterministic startup behavior and eliminates manual dip-switch setup; 200-year retention guarantees integrity over equipment lifetime. | Use Scenario: Holding engine trim tables, sensor offset corrections, and adaptive learning values in engine control units operating under thermal stress. IC Role / Device Role / Timing Role: Calibration data repository written during service mode; read at boot to initialize closed-loop control loops. Use Value: Maintains emissions compliance and drivability after battery disconnect; 1M-cycle endurance supports dealer-level recalibration events. |
| Medical Device Setup Parameters | Point-of-Sale Terminal Security Keys |
Use Scenario: Securing user-defined therapy profiles, alarm limits, and audit log pointers in Class II medical instruments with regulatory traceability requirements. IC Role / Device Role / Timing Role: Tamper-resistant parameter store with write-protection via EWEN/EWDS protocol; accessed only during authenticated service sessions. Use Value: Meets IEC 62304 data integrity requirements; power-fail safe write ensures no partial profile corruption during unexpected shutdown. | Use Scenario: Storing encrypted payment terminal keys, merchant IDs, and firmware version locks in PCI-DSS compliant retail hardware. IC Role / Device Role / Timing Role: Secure key vault with hardware-enforced write disable (EWDS) after initial provisioning; read-only during transaction processing. Use Value: Prevents unauthorized key extraction via bus snooping; 4.5–5.5 V VCC range matches 5 V rail common in legacy POS designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-E/ST | 128 × 16-bit organization; same VCC (2.5–5.5 V), temp range, and TSSOP-8 package | Requires 16-bit data path and controller support; higher density per address but incompatible byte addressing | Select if system uses 16-bit word-aligned data and needs broader voltage tolerance |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, SOIC-8; no Ready/Busy pin | Lacks DO-based status polling; relies on software delay or WIP flag read; different command set | Choose for SPI-native designs where pin count allows extra CS/SCK/MOSI/MISO and voltage flexibility is critical |
Compared with 93LC56BT-E/ST and AT25020B-MAHL-T, the 93C56CT-E/ST offers deterministic 2 ms write timing and hardware status signaling ideal for real-time industrial hosts, while trading voltage flexibility for guaranteed 5 V compatibility and Microwire legacy support.
Availability
93C56CT-E/ST is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical instrumentation, and point-of-sale terminals requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for 93C56CT-E/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 93Cxx series was designed specifically for cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage with minimal pin count and legacy interface compatibility - especially in industrial and automotive control applications.
FAQ
What is the memory organization of the 93C56CT-E/ST?
The 93C56CT-E/ST is an A-version device with fixed 256 × 8-bit organization. It has no functional ORG pin - Pin 7 is NC - and does not support x16 mode. This differs from C-versions (e.g., 93C56CT-E/ST-C) which use ORG to select word size. The 93C56CT-E/ST always operates in 8-bit mode, simplifying interface design for byte-oriented systems.
Does the 93C56CT-E/ST support 3.3 V operation?
No, the 93C56CT-E/ST requires a minimum VCC of 4.5 V and operates up to 5.5 V only. It is not compatible with 3.3 V systems. Attempting to power it at 3.3 V will prevent proper erase/write functionality and may cause undefined behavior. For 3.3 V applications, consider the 93LC56A/B/C family (2.5–5.5 V range) or 93AA56A/B/C (1.8–5.5 V).
How is write protection implemented on the 93C56CT-E/ST?
Write protection on the 93C56CT-E/ST uses an explicit Erase/Write Enable (EWEN) and Erase/Write Disable (EWDS) protocol. The device powers up in EWDS mode - all erase/write commands are ignored until EWEN is issued. After any write, issuing EWDS restores protection. This prevents accidental overwrites during noise events or firmware bugs, and is independent of VCC monitoring.
What is the purpose of the DO pin during programming on the 93C56CT-E/ST?
During erase or write cycles, the DO pin of the 93C56CT-E/ST serves as a Ready/Busy indicator: logic low means the operation is still in progress; logic high means completion. To read status, CS must be brought high for ≥250 ns after the operation starts. This enables precise, low-overhead polling instead of fixed delays - critical for deterministic real-time response in the 93C56CT-E/ST.
Which packages are available for the 93C56CT-E/ST?
93C56CT-E/ST is specified in TSSOP-8 (ST suffix) per Microchip's DS21794G datasheet. Other packages like SOIC-8 (SN), PDIP-8 (P), MSOP-8 (MS), and SOT-23-6 (OT) exist for other variants in the 93C56x family, but the -E/ST designation confirms Thin Shrink Small Outline Package with 0.65 mm lead pitch and Pb-free Matte Tin finish.
93C56CT-E/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, 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93C56CT-E/ST FAQ
1.How can I place an order for 93C56CT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56CT-E/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 93C56CT-E/ST reliable?
The price and inventory of 93C56CT-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C56CT-E/ST is usually 5 days.
3.What payment methods are accepted for 93C56CT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56CT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56CT-E/ST?
93C56CT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56CT-E/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 93C56CT-E/ST?
For technical support, including 93C56CT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56CT-E/ST requirements.
6.How does Aetrix verify that 93C56CT-E/ST is sourced from the original manufacturer or authorized distributors?
All 93C56CT-E/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 93C56CT-E/ST meets industry standards.
7.What is the process for return or replacement of 93C56CT-E/ST?
All 93C56CT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C56CT-E/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 93C56CT-E/ST part is unused and in its original packaging.
Return procedure for 93C56CT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C56CT-E/ST Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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