Microchip Technology 93C56BT-I/MNY

Overview

93C56BT-I/MNY 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, industrial temperature rating (−40°C to +85°C), and Pb-free MSOP-8 package. It delivers 1 million erase/write cycles, >200 years data retention, and integrated power-on/off data protection for embedded configuration storage in microcontroller systems.

For engineers reviewing the 93C56BT-I/MNY datasheet, 93C56BT-I/MNY pinout, 93C56BT-I/MNY application, or 93C56BT-I/MNY equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), 2 ms program cycle time, Ready/Busy status signaling via DO, and compatibility with legacy Microwire controllers requiring strict TCSL ≥250 ns and FCLK ≤3 MHz at 5.5 V.

Technical Context

This device implements a synchronous serial interface with CS, CLK, and DI/DO pins operating in master-slave mode. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are initiated by a Start bit (CS high + DI high on CLK rising edge), followed by opcode, address, and data bits clocked on CLK rising edges.

It features hardware-based data protection: automatic disable of write operations when VCC falls below 3.8 V, power-up default to EWDS (Erase/Write Disable) state, and mandatory EWEN execution before any programming. The DO pin serves dual function - serial data output during READ and active-low Ready/Busy indicator during self-timed erase/write cycles.

Key Specifications

Pinout & Package

93C56BT-I/MNY is supplied in an 8-lead MSOP (Micro Small Outline Package) with 0.65 mm pitch, body size 3.0 × 3.0 mm, and exposed pad (optional VSS connection). Pin 1 is marked by laser dot; package is Pb-free (Matte Tin) and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 93C56B-I/SN, the 93C56BT-I/MNY saves board space and suits compact designs, while 93LC56B-I/MNY extends voltage flexibility at the cost of reduced noise margin and different POR threshold - all three share identical instruction set and timing behavior above 4.5 V.

Availability

93C56BT-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, legacy microcontroller peripheral upgrades, and power management unit settings requiring stable component supply and long-term lifecycle support.

Supply support for 93C56BT-I/MNY 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-pin-count embedded systems requiring reliable nonvolatile storage with minimal MCU resource usage - targeting industrial controls, consumer appliances, and automotive body electronics.

FAQ

What is the memory organization of the 93C56BT-I/MNY?

The 93C56BT-I/MNY is a fixed 256 × 8-bit (2 Kbit) EEPROM with no ORG pin - it operates exclusively in x8 mode. Unlike 'C' variants, it does not support x16 configuration. This eliminates external ORG pin routing and simplifies PCB layout for dedicated byte-oriented applications.

Does the 93C56BT-I/MNY require an Erase/Write Enable (EWEN) command before every write operation?

Yes, the 93C56BT-I/MNY powers up in EWDS (Erase/Write Disable) mode. An EWEN command must be issued before each ERASE or WRITE instruction. After successful programming, executing EWDS restores write protection - a critical step to prevent accidental overwrites during normal operation.

What is the maximum clock frequency supported by the 93C56BT-I/MNY?

The 93C56BT-I/MNY supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. At this rate, minimum TCKH is 200 ns and TCKL is 100 ns. Slower clocks (e.g., 1 MHz) are fully compatible and reduce EMI, but do not extend timing margins beyond datasheet limits.

How is Ready/Busy status monitored on the 93C56BT-I/MNY?

Ready/Busy status is signaled on the DO pin: logic low indicates ongoing erase/write, logic high means complete. To read status, CS must be brought high for ≥250 ns after the command completes, then DO sampled. Issuing a Start bit followed by CS low clears the status flag.

Is the ORG pin functional on the 93C56BT-I/MNY?

No - the ORG pin on the 93C56BT-I/MNY is internally unconnected (NC), as confirmed by the Device Selection Table and Pin Function Table. This part belongs to the 'B' variant group (fixed x8), so ORG has no electrical role and may be left floating or tied to VSS per layout guidelines.