My Inquiry
My Account
Microchip Technology 93C56B-I/MS
- Part No.:
- 93C56B-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C56B-I/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,139
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93C56B-I/MS from Microchip Technology Inc. is a 2 Kbit, 128 × 16-bit organization, low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating at 4.5–5.5 V, rated for industrial temperature (−40°C to +85°C), and housed in an 8-lead MSOP package. It features self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status via DO pin - used in embedded system configuration storage where nonvolatile parameter retention is critical.
For engineers reviewing the 93C56B-I/MS datasheet, 93C56B-I/MS pinout, 93C56B-I/MS application, or 93C56B-I/MS equivalent, key selection considerations include its fixed 16-bit word size (no ORG pin), 2 ms write cycle time, 1 million endurance cycles, 200-year data retention, and compatibility with legacy Microwire controllers in space-constrained industrial modules.
Technical Context
The 93C56B-I/MS implements a synchronous serial interface with CS, CLK, and DI/DO pins, requiring no external clock conditioning. Its instruction set includes READ (20 CLK cycles), WRITE (20 CLK cycles), ERASE (12 CLK cycles), ERAL (12 CLK cycles), and WRAL (20 CLK cycles), all initiated by rising-edge clocked opcodes and addresses.
Unlike C-variant parts, this B-version lacks an ORG pin and permanently configures memory as 128 × 16-bit. Write operations are triggered by the rising edge of CLK on the final data bit, and power-on protection activates below 3.8 V, disabling all programming until VCC stabilizes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (128 × 16-bit) - fixed word width eliminates address translation logic in 16-bit microcontroller systems. |
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V logic rails; disables programming below 3.8 V for robust power-fail safety. |
| Write Cycle Time | 2 ms - deterministic self-timed erase-and-write enables predictable firmware update timing without polling overhead. |
| Endurance | 1,000,000 erase/write cycles - supports frequent calibration or logging in industrial control nodes over 10+ years. |
| Data Retention | 200 years at 25°C - ensures long-term reliability for unattended equipment with infrequent field maintenance. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals without protocol translation. |
| Temp Range | −40°C to +85°C (Industrial) - qualified for operation inside enclosed industrial enclosures without active thermal management. |
Pinout & Package
8-lead MSOP (150 mil) package with exposed pad (optional VSS connection), footprint-compatible with SOIC-8 but 50% smaller area. Pin 1 marked by laser dot; pin 1 corner defined by beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must remain low ≥250 ns between instructions to reset internal state and prevent spurious commands. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; rising edge on final data bit triggers write cycle. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and data; high impedance when CS = low; requires pull-down if shared with DO. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; status valid only after ≥250 ns CS low time. |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; exposed pad may be connected to PCB ground plane for thermal relief. |
| 6 (NC) | No Connection | Internally unconnected; must be left floating or tied to VSS per layout best practice - not usable as ORG or auxiliary signal. |
| 7 (NC) | No Connection | Same as Pin 6 - dual NC pins accommodate family pinout consistency across A/B/C variants. |
| 8 (VCC) | Power Supply | 4.5–5.5 V supply; internal POR circuit asserts at 3.8 V threshold to block writes during brown-out conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or software delay loops - reduces firmware complexity and improves update reliability. |
| Automatic ERAL before WRAL | Guarantees full array erasure prior to bulk write, preventing stale data corruption without requiring separate erase command sequencing. |
| Ready/Busy Status on DO | Enables efficient polling instead of fixed delays - cuts average write latency by up to 40% in interrupt-driven systems. |
| Power-On/Off Data Protection | Hardware-enforced write inhibition below 3.8 V prevents partial writes during power ramp-up/down - critical for fail-safe boot configuration. |
| 128 × 16-bit Fixed Organization | Matches native word width of many 16-bit MCUs (e.g., dsPIC33, C2000), reducing address calculation overhead and buffer alignment code. |
Applications
| Industrial Sensor Calibration Storage | Legacy MCU Configuration Memory |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in programmable logic controllers (PLCs) with no user-accessible storage interface. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization; 2 ms write time fits within 10 ms boot window. Use Value: Eliminates need for external microcontroller GPIO or SPI peripheral - uses existing Microwire-capable pins on older PIC16F/18F families. | Use Scenario: Holding bootloader parameters and communication settings (baud rate, parity) in medical infusion pumps using dsPIC33EP microcontrollers. IC Role / Device Role / Timing Role: Dedicated 16-bit configuration store; DO pin provides real-time write progress feedback to avoid watchdog timeout. Use Value: 128 × 16-bit layout aligns directly with dsPIC's 16-bit data bus, enabling single-word reads/writes without byte-swapping or masking logic. |
| Automated Test Equipment (ATE) Fixture ID | Energy Meter Firmware Patch Storage |
Use Scenario: Encoding unique fixture identification and test limits in semiconductor ATE handlers where reprogramming occurs weekly during maintenance. IC Role / Device Role / Timing Role: Read-only during test execution; written once per fixture setup using dedicated service port. Use Value: 1M endurance exceeds required 500k reprogram cycles over 5-year product life; MSOP package fits tight PCB spacing near JTAG headers. | Use Scenario: Storing field-deployed firmware patches in ANSI C12.22-compliant smart meters, updated via PLC or RF mesh network. IC Role / Device Role / Timing Role: Secure patch staging area; WRAL instruction enables atomic full-image update with built-in ERAL pre-erase. Use Value: 200-year data retention ensures patch validity across meter lifetime without battery-backed SRAM or complex wear-leveling firmware. |
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/MS | Wider VCC range (2.5–5.5 V); same 128 × 16-bit organization and MSOP-8 package. | Supports 3.3 V systems; lacks 5 V-specific power-on protection threshold (3.8 V) of 93C56B. | Select when operating from mixed 3.3/5 V rails or interfacing with low-voltage MCUs - verify POR behavior matches system brown-out requirements. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit × 8-bit, 1.8–5.5 V, SOIC-8 package; no Ready/Busy pin. | Requires SPI master instead of Microwire; no hardware status indication - polling relies on WIP bit in status register. | Select when migrating to SPI-based platforms or when board layout already reserves SOIC-8 footprint; accept added firmware overhead for status polling. |
Compared with 93LC56B-I/MS, the 93C56B-I/MS offers tighter VCC tolerance and stronger brown-out immunity but sacrifices 3.3 V compatibility; versus AT25020B-MAHL-T, it retains Microwire legacy support and hardware-ready signaling at the cost of interface flexibility and package options.
Availability
93C56B-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, legacy MCU configuration, automated test equipment fixture ID, and energy meter firmware patch storage requiring stable component supply across extended production lifecycles.
Supply support for 93C56B-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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving automotive, industrial, consumer, and communications markets.
The 93Cxx EEPROM family was designed specifically for cost-sensitive, space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components and direct compatibility with legacy Microwire controllers.
FAQ
What is the memory organization of the 93C56B-I/MS?
The 93C56B-I/MS has a fixed 128 × 16-bit organization - meaning it stores 128 words of 16 bits each, totaling 2 Kbit. Unlike C-variant parts, it does not feature an ORG pin; the 16-bit width is hardwired, eliminating configuration ambiguity and simplifying interface logic in 16-bit microcontroller designs. This is confirmed in the Device Selection Table and Pin Function Table of DS21794G.
Does the 93C56B-I/MS support 3.3 V operation?
No, the 93C56B-I/MS does not support 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V, and its power-on reset circuit activates at 3.8 V to inhibit programming during brown-out. For 3.3 V systems, consider the pin-compatible 93LC56B-I/MS (2.5–5.5 V range) - but note its POR threshold differs, and it lacks the 93C56B-I/MS's 5 V-specific robustness.
How is the Ready/Busy status signaled on the 93C56B-I/MS?
The 93C56B-I/MS signals Ready/Busy status on the DO pin: DO = low indicates an erase or write operation is in progress; DO = high means the device is ready for the next command. This status is only valid after CS is brought high following a minimum 250 ns low period (TCSL). The DO pin returns to High-Z on the falling edge of CS, as documented in Section 3.4 and Figure 2-1 through 2-11 of DS21794G.
What is the write cycle time for the 93C56B-I/MS, and how is it controlled?
The 93C56B-I/MS has a guaranteed maximum write cycle time of 2 ms for both individual WRITE and bulk WRAL operations. This is a self-timed internal process - no external clock or software delay is needed. The cycle starts on the rising edge of CLK at the final data bit (not on CS falling edge, unlike AA/LC variants), and completion is indicated by DO going high, per Section 2.8 and Table 1-2 (A13) of DS21794G.
Is the 93C56B-I/MS RoHS compliant and lead-free?
Yes, the 93C56B-I/MS is Pb-free and RoHS compliant, with a Matte Tin (Sn) finish on all leads, as explicitly stated in the Features section of DS21794G-page 1. This applies to all standard packages including the MSOP-8 variant, and the RoHS compliance is verified per JEDEC standards referenced in Microchip's packaging documentation.
93C56B-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:
- 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-MSOP
93C56B-I/MS FAQ
1.How can I place an order for 93C56B-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56B-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 93C56B-I/MS reliable?
The price and inventory of 93C56B-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 93C56B-I/MS is usually 5 days.
3.What payment methods are accepted for 93C56B-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56B-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56B-I/MS?
93C56B-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56B-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 93C56B-I/MS?
For technical support, including 93C56B-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56B-I/MS requirements.
6.How does Aetrix verify that 93C56B-I/MS is sourced from the original manufacturer or authorized distributors?
All 93C56B-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 93C56B-I/MS meets industry standards.
7.What is the process for return or replacement of 93C56B-I/MS?
All 93C56B-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C56B-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 93C56B-I/MS part is unused and in its original packaging.
Return procedure for 93C56B-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C56B-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…
