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AT93C46EN-SH-B

1Kbit Microwire EEPROM, 2MHz, 1.8-5.5V, 8/16-bit config, SOIC-8

8634

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Pieza del fabricante：

AT93C46EN-SH-B

Paquete：

8-SOIC (4.9 x 3.9 x 1.25 mm, SN package)

Descripción

Productos

The AT93C46EN-SH-B from Microchip is a 1Kbit (128×8 or 64×16) Microwire serial EEPROM with 2MHz clock rate, 1 million erase/write cycles, and 100-year data retention in an 8-pin SOIC package.

Especificaciones

Memory Size	1 Kbit (128 x 8 or 64 x 16)
Interface	Microwire (3-wire serial: CS, SK, DI/DO)
Organization	Configurable: 8-bit or 16-bit
Clock Frequency	2 MHz (max)
Tensión de alimentación	1.8V to 5.5V
Write Cycle Time	5 ms (max)
Erase/Write Endurance	1,000,000 cycles
Data Retention	100 years
Write Protect	Yes (protect upper quarter)
Paquete	8-SOIC (3.9mm width)
Temperatura de funcionamiento	-40 to +85 C

Características

Industry-standard Microwire bus interface
Configurable 8-bit or 16-bit organization (ORG pin)
Self-timed write cycle with auto-erase
Hardware write protect for upper quarter
1 million erase/write cycle endurance
100-year data retention

Aplicaciones

Configuration parameter storage
Calibration data storage
Serial number storage
Small data logging

Introducción del producto:AT93C46EN-SH-B Presentación del producto

The AT93C46EN-SH-B from Microchip is a 1Kbit Microwire serial EEPROM organized as either 128 words of 8 bits each or 64 words of 16 bits each, selectable via the ORG (organization) pin. The device uses the industry-standard 3-wire Microwire serial bus (CS, SK, DI/DO) for communication, making it compatible with a wide range of microcontrollers and ASICs. The Microwire protocol is a synchronous serial interface where the master provides the clock (SK), chip select (CS), and data input (DI) signals, while the EEPROM provides data output (DO). The AT93C46 supports all standard EEPROM operations: READ, WRITE, ERASE, ERAL (erase all), WRAL (write all), and EWEN/EWDS (enable/disable writing). The write cycle is self-timed with automatic erase-before-write, requiring only 5ms maximum per write cycle. The ORG pin allows the designer to choose between 8-bit and 16-bit data word organization without changing the software protocol; when ORG is tied to VCC, the device operates in 16-bit mode (64 words x 16 bits); when ORG is tied to GND, it operates in 8-bit mode (128 words x 8 bits). The hardware write protect feature (protect pin) prevents accidental writes to the upper quarter of the memory array, protecting critical configuration data. With 1 million erase/write cycle endurance and 100-year data retention, the AT93C46 is suitable for storing calibration constants, configuration parameters, and serial numbers in industrial and consumer applications.

Principio de funcionamiento:AT93C46EN-SH-B Principio de funcionamiento

The AT93C46EN-SH-B operates as a Microwire serial EEPROM. Key subsystems include: (1) Microwire Interface – a synchronous serial protocol where CS (chip select) enables the device; SK (serial clock) synchronizes data transfer; DI (data in) receives commands and data from the master; DO (data out) sends data back to the master; each operation begins with a start bit (1), followed by an opcode (2 bits), address (6 or 7 bits depending on organization), and data; (2) Instruction Set – READ (opcode 10): reads data from specified address; ERASE (opcode 11): erases the specified address; WRITE (opcode 01): writes data to specified address after auto-erase; ERAL (opcode 00+10): erases all addresses; WRAL (opcode 00+01): writes same data to all addresses; EWEN (opcode 00+11): enables writing; EWDS (opcode 00+00): disables writing; (3) Self-Timed Write – when a WRITE or ERASE command is received, the device internally generates the high voltage needed for programming; the write cycle takes 5ms maximum; the BUSY/READY status can be checked by polling CS; (4) Organization Select – the ORG pin selects between x8 and x16 modes at power-up; in x8 mode, addresses are 7 bits (A6-A0) accessing 128 bytes; in x16 mode, addresses are 6 bits (A5-A0) accessing 64 words; (5) Write Protect – when the protect pin is asserted, the upper quarter of the memory (addresses 96-127 in x8 mode or 48-63 in x16 mode) is write-protected, preventing accidental modification of critical data.

Descripción de la clavija:AT93C46EN-SH-B Definición y funciones de las clavijas

Pin	Nombre	Función
1	CS	Chip select (active high)
2	SK	Serial clock input
3	DI	Data input (from master)
4	DO	Data output (to master)
5	GND	Suelo
6	ORG	Organization select (VCC=x16, GND=x8)
7	NC/PROTECT	No connect or write protect (version dependent)
8	VCC	Supply voltage (1.8V to 5.5V)

Application Scenarios:In which products and applications isAT93C46EN-SH-B usado

Sensor calibration: store 128 bytes of calibration coefficients for a pressure sensor with 100-year retention
Configuration storage: 64 x 16-bit words for MCU startup parameters and user settings
Serial number: store unique device ID with write-protect on upper quarter to prevent modification
Small data log: 1Kbit of non-volatile storage for event counters and fault records

Alternative Models:What chips are recommended as replacements for AT93C46EN-SH-B

Fabricante	Número de pieza	Paquete	Notas
Microchip	AT93C46D-SSHM-B	SOIC-8	2.5V-5.5V version
ST	M93C46-WMN6	SOIC-8	ST equivalent Microwire EEPROM
onsemi	CAT93C46VI-G	SOIC-8	onsemi equivalent
Microchip	AT93C56B-SSHM-B	SOIC-8	2Kbit version (double capacity)