Microchip 93C46BT-I/SN: Datasheet, Pinout, and Application Circuit Guide
The Microchip 93C46BT-I/SN is a 1K-bit, 16-bit organization Microwire serial EEPROM, serving as a reliable non-volatile memory solution for a vast array of consumer, industrial, and automotive applications. This device is designed for low-power operation and offers a simple 3-wire serial interface, making it an ideal choice for storing calibration data, configuration settings, and other critical information in embedded systems.
Datasheet Overview and Key Features
According to its datasheet, the 93C46BT-I/SN is built on Microchip's advanced CMOS technology, ensuring low power consumption. Key electrical characteristics include a wide voltage range from 2.5V to 5.5V, allowing for flexible use in both 3.3V and 5V systems. Its current consumption is remarkably low, with a standby current of just 150µA (max) and an active read current of 250µA (max) at 5V.
The memory array is organized as 64 x 16 bits. It features a sequential read operation for faster data throughput and supports a full set of instructions, including READ, WRITE, EWEN (Erase/Write Enable), ERASE, and WRALL (Write All). A critical feature for data integrity is its built-in self-timed write cycle, which automatically clears the write-in-progress bit upon completion, eliminating the need for an external polling delay. The device offers a minimum of 1,000,000 erase/write cycles and boasts 100 years of data retention.
Pinout Configuration
The 93C46BT-I/SN is available in an 8-lead SOIC (SN) package. Its pinout is as follows:
Pin 1 (CS): Chip Select. This active-high input initiates and terminates a command sequence.
Pin 2 (SK): Serial Data Clock. This input synchronizes data movement on the DI and DO pins.
Pin 3 (DI): Serial Data Input. This pin is used to receive instruction and data bits from the microcontroller.
Pin 4 (DO): Serial Data Output. This pin is used to shift out data during a read operation.
Pin 5 (GND): Ground.
Pin 6 (NC): No Connect. This pin is not internally connected and can be left floating.
Pin 7 (NC): No Connect. This pin is not internally connected and can be left floating.
Pin 8 (VCC): Power Supply.
Application Circuit Guide
Integrating the 93C46BT-I/SN into a design is straightforward. A typical application circuit involves connecting it directly to a host microcontroller unit (MCU).
1. Power (VCC & GND): Connect Pin 8 (VCC) to the system's positive power rail (2.5V-5.5V) and Pin 5 (GND) to the common ground. A 0.1µF decoupling capacitor should be placed as close as possible between VCC and GND to filter high-frequency noise.
2. Serial Interface (CS, SK, DI, DO): These control and data pins are connected directly to general-purpose I/O (GPIO) pins on the MCU.
CS is controlled by the MCU to select the device.
SK is generated by the MCU to clock data in and out.
DI is connected to an MCU output pin (e.g., MOSI).
DO is connected to an MCU input pin (e.g., MISO).
3. Pull-Up Resistor: While the DO pin is often push-pull, a 10kΩ pull-up resistor on the DI line can be used in noisy environments to ensure a stable default high state, though it is not always mandatory.
This simple 3-wire (plus chip select) interface minimizes the number of MCU pins required, making it extremely efficient for space-constrained PCB designs.
The Microchip 93C46BT-I/SN stands out as a robust, low-power, and easy-to-implement serial EEPROM. Its wide operating voltage, simple Microwire interface, and excellent endurance make it a perennial favorite for designers needing reliable non-volatile memory in a compact package. Whether for storing device parameters or user data, this EEPROM provides a proven and cost-effective solution.
Keywords:
1. Serial EEPROM
2. Microwire Interface
3. Non-Volatile Memory
4. Low-Power
5. 93C46 Pinout
