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Microchip Technology 93C56B-I/ST
- Part No.:
- 93C56B-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C56B-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,971
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Product details
Overview
93C56B-I/ST from Microchip Technology Inc. is a 2 Kbit (128 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, industrial temperature rating (–40°C to +85°C), and Pb-free SOIC-8 package. It supports self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status via DO pin - used for nonvolatile parameter storage in microcontroller-based power supplies.
For engineers reviewing the 93C56B-I/ST datasheet, 93C56B-I/ST pinout, 93C56B-I/ST application, or 93C56B-I/ST equivalent, key selection criteria include its fixed 16-bit organization (no ORG pin), 2 ms write cycle time, 1 million endurance cycles, 200-year data retention, and compatibility with legacy Microwire controllers requiring strict timing compliance at 5 V.
Technical Context
The 93C56B-I/ST implements a synchronous serial interface with CS, CLK, and DI/DO pins - no ORG pin present (dedicated x16 mode). Its internal logic requires a Start bit (CS high + DI high on CLK rising edge) before accepting opcode, address, and data. Write operations are initiated by CLK rising edge on final data bit (93C-series behavior), not CS falling edge.
It features hardware-level data protection: power-on/off detection triggers write inhibition below 3.8 V VCC, and default EWDS state prevents accidental writes until explicit EWEN command. Sequential read is supported with automatic address increment while CS remains high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 words × 16 bits) - fixed x16 organization; no ORG pin; no runtime word-size switching |
| VCC range | 4.5 V to 5.5 V - incompatible with 3.3 V or 2.5 V systems; voltage detect threshold at 3.8 V disables writes below that level |
| Write cycle time | 2 ms - self-timed erase+write; enables deterministic firmware delay handling without polling overhead |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, 5.0 V; suitable for frequent calibration or configuration updates |
| Data retention | 200 years - guaranteed minimum retention at +85°C; critical for long-lifecycle industrial equipment |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - requires master to generate precise TCKH/TCKL (≥250 ns/≥200 ns at 5 V) |
| Temp range | –40°C to +85°C (Industrial grade) - qualified per AEC-Q100 not required; intended for non-automotive embedded use |
Pinout & Package
Package: 8-lead SOIC (SOIC-8, suffix 'ST'), Pb-free Matte Tin finish, body dimensions 4.9 mm × 3.9 mm × 1.75 mm.
| 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 but completes ongoing write |
| 2 CLK | Serial Clock | Positive-edge synchronized I/O; clocking stops during self-timed write; TCKH/TCKL minima define max 3 MHz operation at 5 V |
| 3 DI | Data Input | Accepts Start bit, opcode (2-bit), address (7-bit), and data (16-bit); no internal pull-up; requires external drive |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); high-Z when CS low or during non-read states; requires external pull-up for status polling |
| 5 VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to avoid timing violations |
| 6 NC | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice; not usable as ORG |
| 7 NC | No Connect | Internally unconnected; same as Pin 6 - no functional role; avoid routing signals here |
| 8 VCC | Power Supply | 4.5–5.5 V only; bypass capacitor (0.1 µF ceramic) required within 10 mm of pin for stable write operation |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or status polling loops - firmware inserts fixed 2 ms delay after WRITE/ERAL/WRAL commands |
| Automatic ERAL before WRAL | Ensures full array erase prior to bulk write; removes risk of partial overwrite corruption in firmware implementations |
| Power-on/off data protection | Hardware lockout below 3.8 V VCC prevents bit corruption during brown-out or hot-plug events without software intervention |
| Ready/Busy status on DO | Enables real-time status monitoring during programming - avoids fixed delays when system timing margins are tight |
| 128 × 16-bit fixed organization | Optimizes memory access for 16-bit microcontrollers (e.g., PIC18F, dsPIC) - eliminates software bit-packing for configuration registers |
Applications
| Industrial PLC I/O Module Calibration | Medical Infusion Pump Parameter Storage |
|---|---|
Use Scenario: Storing sensor calibration coefficients and alarm thresholds updated during factory setup and field service. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently via SPI-like Microwire interface during initialization or maintenance mode. Use Value: 200-year data retention ensures calibration integrity across product lifetime; 1M endurance supports >100 field recalibrations over 15 years. | Use Scenario: Holding drug delivery profiles, user preferences, and audit logs in battery-backed safety-critical medical devices. IC Role / Device Role / Timing Role: Secure parameter store isolated from main MCU flash; accessed only during boot or menu navigation using dedicated GPIO-controlled Microwire bus. Use Value: Hardware write-protection (EWDS default + VCC lockout) prevents accidental overwrite during power transients - meets IEC 62304 SW safety requirements. |
| Automotive Body Control Module (Non-CAN) | Point-of-Sale Terminal Configuration |
Use Scenario: Storing seat/mirror position presets, lighting profiles, and door lock behavior in 12 V automotive subsystems with local 5 V regulation. IC Role / Device Role / Timing Role: Secondary nonvolatile memory co-located with 8/16-bit MCU; interfaces directly without level-shifting due to 4.5–5.5 V VCC match. Use Value: Industrial temp range (–40°C to +85°C) covers under-hood ambient extremes; SOIC-8 package enables automated reflow assembly alongside MCU. | Use Scenario: Maintaining tax rate tables, receipt formatting rules, and user PINs in retail terminals operating 24/7 with periodic firmware updates. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM on isolated I/O bus - decouples settings from application flash to prevent corruption during OTA updates. Use Value: 2 ms write time allows fast save-on-exit; sequential read enables rapid table lookup during transaction processing without address overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B-I/ST | Wider VCC range (2.5–5.5 V); same 128×16 organization; 6 ms write cycle; supports –40°C to +125°C (E grade) | Enables direct 3.3 V MCU interfacing; higher temp grade suits under-dash automotive use | Select if system operates below 4.5 V or requires extended temperature qualification |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit (256×8), 1.8–5.5 V, 5 ms write, 1M endurance, SOIC-8 | Requires SPI master instead of Microwire; byte-addressable vs. word-addressable; no ERAL/WRAL commands | Select if migrating from legacy Microwire to standard SPI infrastructure or needing byte-level writes |
Compared with 93LC56B-I/ST, the 93C56B-I/ST trades voltage flexibility and extended temperature support for faster 2 ms writes and tighter 5 V timing compliance; versus AT25020B-SSHL-T, it retains Microwire compatibility and word-oriented architecture essential for legacy controller reuse.
Availability
93C56B-I/ST is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, point-of-sale terminals, and automotive body electronics requiring stable component supply with long-term lifecycle assurance.
Supply support for 93C56B-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products for embedded applications.
The 93Cxx EEPROM family was designed for cost-sensitive, low-power nonvolatile storage in resource-constrained 8/16-bit systems requiring simple 3-wire communication and robust data integrity under voltage fluctuation.
FAQ
What is the function of the ORG pin on the 93C56B-I/ST?
The 93C56B-I/ST has no ORG pin - it is a fixed 16-bit organization (128 × 16) device. The ORG pin exists only on 'C' variants (e.g., 93C56C); 'A' and 'B' versions like the 93C56B-I/ST permanently implement x8 or x16 structure respectively without external configuration. Pin 6 and Pin 7 on the 93C56B-I/ST are No Connect (NC) and must remain unconnected.
Can the 93C56B-I/ST operate at 3.3 V?
No. The 93C56B-I/ST requires a minimum VCC of 4.5 V and is rated only for 4.5–5.5 V operation. Below 4.5 V, the internal voltage detector (threshold 3.8 V) disables all write functions, and timing parameters are not guaranteed. For 3.3 V systems, consider the 93LC56B-I/ST (2.5–5.5 V range) or AT25020B-SSHL-T (1.8–5.5 V).
How does the Ready/Busy status work on the 93C56B-I/ST DO pin?
During an erase, write, ERAL, or WRAL operation, the DO pin outputs Ready/Busy status: logic low indicates active programming, logic high indicates completion. To read status, CS must be brought high for ≥250 ns after the instruction completes; DO then reflects status until next CS low. After completion, issuing a Start bit and lowering CS clears the status flag.
What is the maximum clock frequency supported by the 93C56B-I/ST?
At VCC = 4.5–5.5 V, the 93C56B-I/ST supports up to 3 MHz clock frequency (FCLK), with minimum TCKH = 250 ns and TCKL = 200 ns. This limit applies only during instruction/data transfer - CLK is ignored during self-timed 2 ms write cycles. Exceeding timing minima causes command rejection or data corruption.
Does the 93C56B-I/ST support sequential read mode?
Yes. When CS remains high after a READ instruction, the device automatically increments the internal address counter and outputs subsequent memory words on DO with each CLK rising edge - enabling efficient block reads without re-sending opcodes or addresses. This reduces bus overhead and improves throughput for multi-word configuration loads.
93C56B-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:
- 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93C56B-I/ST FAQ
1.How can I place an order for 93C56B-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56B-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 93C56B-I/ST reliable?
The price and inventory of 93C56B-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 93C56B-I/ST is usually 5 days.
3.What payment methods are accepted for 93C56B-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56B-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56B-I/ST?
93C56B-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56B-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 93C56B-I/ST?
For technical support, including 93C56B-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56B-I/ST requirements.
6.How does Aetrix verify that 93C56B-I/ST is sourced from the original manufacturer or authorized distributors?
All 93C56B-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 93C56B-I/ST meets industry standards.
7.What is the process for return or replacement of 93C56B-I/ST?
All 93C56B-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C56B-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 93C56B-I/ST part is unused and in its original packaging.
Return procedure for 93C56B-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C56B-I/ST Tags
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AT24C02C-XHM-T
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93LC46BT-I/OT
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