My Inquiry
My Account
Microchip Technology 93C56A-I/MS
- Part No.:
- 93C56A-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C56A-I/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,177
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93C56A-I/MS 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 rating (–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 93C56A-I/MS datasheet, 93C56A-I/MS pinout, 93C56A-I/MS application, or 93C56A-I/MS equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), 2 ms typical write cycle time, MSOP-8 package compatibility, and support for sequential read and WRAL/ERAL commands in resource-constrained microcontroller systems.
Technical Context
The 93C56A-I/MS implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins - no ORG pin (dedicated x8 mode). Its internal architecture includes an address decoder, data register, output buffer, and memory array with auto-erase-before-write logic.
It uses a start-bit detection protocol: CS and DI high on first CLK rising edge initiates instruction decoding. Write/erase operations are initiated by CLK rising edge (93C series), not CS falling edge, and DO provides real-time Ready/Busy status when CS is reasserted after ≥250 ns low time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 words × 8 bits) - fixed x8 organization, no ORG pin required |
| VCC Range | 4.5 V to 5.5 V - requires stable 5 V rail; POR threshold at 3.8 V prevents spurious writes during brown-out |
| Write Cycle Time | 2 ms max - self-timed; enables deterministic firmware timing without polling overhead beyond status check |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in metering or sensor calibration applications |
| Data Retention | 200 years at 25°C - ensures long-term validity of stored configuration or calibration constants |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage; no SPI mode bits or mode configuration needed |
| Temp Range | –40°C to +85°C (Industrial grade) - validated for operation in industrial control panels and automotive body modules |
Pinout & Package
8-pin MSOP (150 mil) package with exposed pad (optional VSS connection), RoHS-compliant matte tin finish. Pin 1 marked by laser dot; pin 1 corner defined by notch or bevel per JEDEC MO-187.
| 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 | Rising-edge synchronized I/O; clock stops freely during transmission; rising edge triggers write/erase on last data bit (93C series) |
| 3 (DI) | Data Input | Accepts start bit, opcode, address, and data; tied high with CS on first CLK edge to initiate command |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; status valid only after CS reassertion ≥250 ns post-CS-low |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; exposed pad may be connected to PCB ground plane for thermal and EMI performance |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice - no functional role |
| 7 (NC) | No Connect | Same as Pin 6 - dual NC pins due to MSOP pinout mapping; no routing or termination required |
| 8 (VCC) | Power Supply | 4.5–5.5 V supply; internal voltage detector (VPOR = 3.8 V) blocks writes below threshold to prevent corruption |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing circuitry; firmware waits only for DO status transition, not fixed delays |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write - prevents partial overwrite corruption in firmware update routines |
| Power-On/Off Data Protection | Hardware-level VCC monitoring blocks all writes below 3.8 V, preventing data loss during power ramp-up/down |
| Sequential Read Mode | Enables fast dump of multiple registers with single CS assertion - reduces transaction overhead in boot-time config loading |
| EWEN/EWDS Security | Explicit erase/write enable/disable commands prevent accidental overwrites; powers up in EWDS (locked) state |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 200-year retention and 1M endurance for field recalibration cycles. Use Value: Eliminates need for external backup battery or supercapacitor; supports recalibration every 6 months over 10+ years of product life. | Use Scenario: Holding user-configurable settings (baud rate, network ID, display contrast) in HVAC controller HMI modules. IC Role / Device Role / Timing Role: Serial configuration memory interfaced directly to 8-bit MCU GPIOs with minimal firmware driver footprint. Use Value: Reduces BOM count vs. parallel EEPROM; enables field updates via UART without requiring full firmware reflash. |
| Automotive Body Control Module | Medical Device Usage Log |
Use Scenario: Recording door lock actuation counts and error flags in 12 V automotive BCMs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM with 4.5–5.5 V VCC range compatible with regulated 5 V supply derived from vehicle battery. Use Value: Survives cold-cranking voltage dips; WRAL command allows atomic reset of entire log on service intervention. | Use Scenario: Storing timestamped usage events (e.g., sterilization cycles, battery discharge logs) in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory with hardware write-protection (EWDS) activated after each log entry. Use Value: Meets IEC 62304 data integrity requirements; 2 ms write time enables logging within <5 ms interrupt latency budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56A-I/MS | 2.5–5.5 V VCC range; same 256×8 organization; identical MSOP-8 pinout and instruction set | Supports wider supply range including 3.3 V systems; lacks 93C56A's 5 V-specific optimization for noise immunity | Select when interfacing with mixed-voltage MCUs or where 3.3 V operation is required |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit, 1.8–5.5 V; no Ready/Busy pin - relies on WIP flag polling | Requires dedicated SPI peripheral; no DO-based status signaling; higher pin count (SOIC-8) | Select when existing design uses SPI peripherals and firmware already implements WIP polling |
Compared with 93LC56A-I/MS, the 93C56A-I/MS offers tighter 5 V noise margin and faster 2 ms write time but sacrifices 3.3 V compatibility; versus AT25020B, it delivers deterministic status feedback and lower GPIO count at the cost of Microwire-specific driver implementation.
Availability
93C56A-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control module designs requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for 93C56A-I/MS 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 components, and memory solutions, headquartered in Chandler, Arizona.
The 93C56A-I/MS belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal external components and robust power-supply immunity.
FAQ
What is the function of the NC pins on the 93C56A-I/MS?
Pins 6 and 7 on the 93C56A-I/MS are No Connect (NC) terminals with no internal connection. They must remain unconnected in the PCB layout - neither routed nor terminated. This reflects the MSOP-8 pinout mapping for the 93C56A variant, which omits the ORG pin present in 'C' versions. The 93C56A-I/MS datasheet explicitly states ORG is NC on A/B devices, confirming these pins serve no electrical function in the 93C56A-I/MS.
Does the 93C56A-I/MS support 3.3 V operation?
No, the 93C56A-I/MS does not support 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V, with a power-on reset threshold of 3.8 V. Attempting to operate the 93C56A-I/MS below 4.5 V risks unreliable communication, failed writes, or data corruption. For 3.3 V systems, Microchip's 93LC56A-I/MS (2.5–5.5 V) is the functionally identical alternative with same pinout and instruction set.
How does the Ready/Busy status work on the 93C56A-I/MS DO pin?
The DO pin of the 93C56A-I/MS outputs Ready/Busy status during erase/write cycles: DO = low indicates programming in progress; DO = high means operation complete. To read status, CS must be brought high for ≥250 ns after being low (TCSL), then sampled on CLK rising edges. DO returns to High-Z on CS falling edge. This mechanism eliminates need for fixed delay loops - firmware can poll DO synchronously with minimal overhead.
What is the difference between WRAL and separate ERAL + WRITE commands on the 93C56A-I/MS?
The WRAL (Write All) command on the 93C56A-I/MS performs an automatic ERAL (Erase All) followed by a full-array write in one atomic operation - no intermediate steps required. Unlike issuing ERAL then WRITE separately, WRAL guarantees the entire memory is erased before any new data is written, preventing partial corruption if power fails mid-process. WRAL requires VCC ≥4.5 V and chip to be in EWEN state, matching 93C56A-I/MS's operational constraints.
Is the 93C56A-I/MS pin-compatible with other 93XX56 variants in MSOP-8 package?
Yes, the 93C56A-I/MS is pin-compatible with 93AA56A-I/MS and 93LC56A-I/MS in the MSOP-8 (MS) package - all share identical pinout (CS/CLK/DI/DO/VSS/NC/NC/VCC), same footprint, and identical instruction set. However, VCC ranges differ: 93AA56A supports 1.8–5.5 V, 93LC56A supports 2.5–5.5 V, while 93C56A-I/MS is limited to 4.5–5.5 V. Swapping requires verifying supply voltage compliance.
93C56A-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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
- 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-MSOP
93C56A-I/MS FAQ
1.How can I place an order for 93C56A-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56A-I/MS 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 93C56A-I/MS reliable?
The price and inventory of 93C56A-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C56A-I/MS is usually 5 days.
3.What payment methods are accepted for 93C56A-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56A-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56A-I/MS?
93C56A-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56A-I/MS 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 93C56A-I/MS?
For technical support, including 93C56A-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56A-I/MS requirements.
6.How does Aetrix verify that 93C56A-I/MS is sourced from the original manufacturer or authorized distributors?
All 93C56A-I/MS 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 93C56A-I/MS meets industry standards.
7.What is the process for return or replacement of 93C56A-I/MS?
All 93C56A-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C56A-I/MS, 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 93C56A-I/MS part is unused and in its original packaging.
Return procedure for 93C56A-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C56A-I/MS 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…
