Microchip Technology 93C56B-E/MS

Overview

93C56B-E/MS 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, and industrial-temperature operation (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status signaling via DO pin, and 1,000,000 endurance cycles - deployed in embedded control systems for parameter storage and calibration data retention.

For engineers reviewing the 93C56B-E/MS datasheet, 93C56B-E/MS pinout, 93C56B-E/MS application, or 93C56B-E/MS equivalent, key selection criteria include its fixed 16-bit word organization (no ORG pin), MSOP-8 package compatibility, 2 ms write cycle time, VCC ≥4.5 V requirement for ERAL/WRAL, and absence of internal ORG logic - distinguishing it from C-variant counterparts.

Technical Context

The 93C56B-E/MS implements a synchronous serial Microwire protocol with CS, CLK, DI, and DO signals. Its fixed 128 × 16-bit memory array eliminates ORG pin dependency, enabling deterministic 16-bit data transfers without external configuration logic. All programming operations (ERASE, WRITE, ERAL, WRAL) are self-timed and initiated by CLK rising edge on final data bit (93C-series behavior).

Power-on data protection is enforced via VCC detect circuitry (trip point 3.8 V), disabling all write functions below threshold. The device powers up in EWDS mode, requiring explicit EWEN instruction prior to any erase/write - ensuring robust immunity against spurious writes during power ramp or noise events.

Key Specifications

Pinout & Package

8-pin MSOP (150 mil) package with exposed pad (optional VSS connection), Pb-free Matte Tin finish. Pin 1 marked by laser dot; pin 1 corner defined by beveled edge.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 93LC56B-I/MS, the 93C56B-E/MS provides tighter VCC regulation assurance for critical bulk operations but sacrifices 3.3 V compatibility; versus AT25020B-MAHL-T, it retains Microwire simplicity and legacy firmware compatibility at the cost of interface flexibility and speed.

Availability

93C56B-E/MS is available at Aetrix Electronics and suitable for motor control calibration, industrial sensor nodes, automotive body controllers, and medical device configuration requiring stable component supply across extended production lifecycles.

Supply support for 93C56B-E/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, with global design and manufacturing operations.

The 93Cxx series was designed specifically for cost-sensitive, low-power embedded systems requiring reliable serial nonvolatile storage with minimal pin count and firmware overhead - emphasizing robustness in industrial and automotive environments.

FAQ

What is the memory organization of the 93C56B-E/MS?

The 93C56B-E/MS has a fixed 128 × 16-bit organization - meaning it stores 128 words of 16 bits each (2 Kbit total). Unlike C-variant parts, it does not feature an ORG pin; the 16-bit width is hardwired, eliminating configuration dependencies and simplifying host interface logic. This structure is ideal for storing aligned parameter sets such as calibration coefficients or register maps in 16-bit microcontrollers.

Does the 93C56B-E/MS require an external ORG pin connection?

No, the 93C56B-E/MS does not require or support an ORG pin. As a 'B'-suffix variant, its 16-bit organization is factory-fixed and internally implemented. Pins 6 and 7 are designated NC (No Connect) in the MSOP-8 package - they must remain unconnected or tied to VSS per layout guidelines. This eliminates external pull-up/pull-down resistors and reduces BOM count compared to C-variants.

What is the minimum VCC required for ERAL and WRAL operations on the 93C56B-E/MS?

The 93C56B-E/MS requires VCC ≥4.5 V for proper execution of ERAL (Erase All) and WRAL (Write All) commands. This is enforced by internal voltage detection circuitry with a 3.8 V trip point - below which all write functions are disabled. Systems must ensure stable 5 V regulation during bulk operations, as undervoltage will abort ERAL/WRAL and leave memory in undefined state.

How does the 93C56B-E/MS indicate write completion during programming cycles?

The 93C56B-E/MS uses the DO pin to signal Ready/Busy status: DO = low indicates active erase/write in progress; DO = high confirms completion. This polling mechanism requires CS to be brought high for ≥250 ns after initiating the command. The device does not support interrupt-driven status reporting - host firmware must sample DO synchronously with CLK after CS activation to determine readiness.

Is the 93C56B-E/MS compatible with 3.3 V microcontrollers?

No, the 93C56B-E/MS is not compatible with 3.3 V microcontrollers for direct I/O interfacing. Its absolute VCC range is strictly 4.5–5.5 V, and its input thresholds (VIH1 = 2.0 V min, VIL1 = 0.8 V max) assume a 5 V logic family. Interfacing with 3.3 V MCUs requires level-shifting circuitry on CS, CLK, DI, and DO lines - or selection of the 93LC56B-I/MS (2.5–5.5 V) as a drop-in alternative with identical pinout and functionality.