The part number you provided, AT27C512R-70JU, corresponds to an EEPROM ( Electrical ly Erasable Programmable Read-Only Memory ) chip produced by Atmel (now part of Microchip Technology).
Packaging and Pin Count:
AT27C512R-70JU typically comes in a 28-pin Dual In-line Package (DIP) or 28-pin PLCC (Plastic Leaded Chip Carrier) package. The 28 pins provide access to the various control and data input/output (I/O) functionalities.Pin Function Specifications:
Here’s a detailed breakdown of the 28-pin DIP package:
Pin Number Pin Name Pin Function Description 1 A7 Address input pin 7. Used to specify the address in the memory array. 2 A6 Address input pin 6. Used to specify the address in the memory array. 3 A5 Address input pin 5. Used to specify the address in the memory array. 4 A4 Address input pin 4. Used to specify the address in the memory array. 5 A3 Address input pin 3. Used to specify the address in the memory array. 6 A2 Address input pin 2. Used to specify the address in the memory array. 7 A1 Address input pin 1. Used to specify the address in the memory array. 8 A0 Address input pin 0. Used to specify the address in the memory array. 9 Chip Enable (CE) Active low input that enables the device. When high, the device is disabled. 10 Output Enable (OE) Active low input that controls whether the output pins are active or high-impedance. 11 Write Enable (WE) Active low input used to initiate write operations. When high, write operations are disabled. 12 Vcc Power supply pin. Typically +5V for this device. 13 A8 Address input pin 8. Used to specify the address in the memory array. 14 A9 Address input pin 9. Used to specify the address in the memory array. 15 A10 Address input pin 10. Used to specify the address in the memory array. 16 A11 Address input pin 11. Used to specify the address in the memory array. 17 A12 Address input pin 12. Used to specify the address in the memory array. 18 A13 Address input pin 13. Used to specify the address in the memory array. 19 A14 Address input pin 14. Used to specify the address in the memory array. 20 A15 Address input pin 15. Used to specify the address in the memory array. 21 A16 Address input pin 16. Used to specify the address in the memory array. 22 A17 Address input pin 17. Used to specify the address in the memory array. 23 A18 Address input pin 18. Used to specify the address in the memory array. 24 A19 Address input pin 19. Used to specify the address in the memory array. 25 A20 Address input pin 20. Used to specify the address in the memory array. 26 A21 Address input pin 21. Used to specify the address in the memory array. 27 A22 Address input pin 22. Used to specify the address in the memory array. 28 Ground (GND) Ground pin. Provides the reference voltage level (0V) for the device.Pin Function Summary:
The AT27C512R-70JU is a 512Kb (kilobit) EEPROM with a 28-pin package. It includes address pins (A0 to A22), control pins (CE, OE, WE), and power (Vcc and GND). The address pins (A0-A22) are used to select a specific memory location. The CE pin enables the chip when low, and the OE pin allows data to be output when low. The WE pin enables write operations when low.20 Common FAQs About the AT27C512R-70JU
Q: What is the AT27C512R-70JU? A: The AT27C512R-70JU is a 512Kb EEPROM memory chip produced by Atmel, used for storing non-volatile data.
Q: What is the package type of the AT27C512R-70JU? A: The AT27C512R-70JU typically comes in a 28-pin Dual In-line Package (DIP) or 28-pin PLCC.
Q: How many pins are there in the AT27C512R-70JU? A: The AT27C512R-70JU has 28 pins in total.
Q: What is the voltage supply for the AT27C512R-70JU? A: The AT27C512R-70JU typically operates at a 5V power supply (Vcc pin).
Q: What does the CE pin do? A: The CE (Chip Enable) pin is an active low input that enables the device. When CE is high, the chip is disabled.
Q: What is the function of the OE pin? A: The OE (Output Enable) pin controls whether the data pins are active or in a high-impedance state. It’s active low.
Q: What does the WE pin control? A: The WE (Write Enable) pin controls write operations. When low, it enables writing to the EEPROM.
Q: How do the address pins (A0 to A22) work? A: The address pins specify which memory location to access. They select the address in the 512Kb memory space.
Q: What is the AT27C512R-70JU used for? A: The AT27C512R-70JU is used in applications requiring non-volatile data storage, such as storing firmware or configuration settings.
Q: How is data written to the AT27C512R-70JU? A: Data is written to the AT27C512R-70JU by driving the WE pin low and providing data through the I/O pins while selecting the correct address with the address pins.
Q: How is data read from the AT27C512R-70JU? A: Data is read by enabling the chip (CE low), enabling output (OE low), and selecting the desired address.
Q: What is the access time for the AT27C512R-70JU? A: The access time of the AT27C512R-70JU is typically 70ns, meaning it takes 70ns to access data.
Q: How many memory locations can the AT27C512R-70JU store? A: The AT27C512R-70JU can store 512Kb (kilobits) of data, or 64KB (kilobytes).
Q: Can the AT27C512R-70JU be reprogrammed? A: Yes, the AT27C512R-70JU is electrically erasable and can be reprogrammed multiple times.
Q: What is the maximum clock frequency for the AT27C512R-70JU? A: The AT27C512R-70JU typically supports up to 12.5MHz clock frequency.
Q: What is the maximum current the AT27C512R-70JU can consume? A: The maximum current consumption is typically around 30mA during write operations.
Q: Is the AT27C512R-70JU compatible with 3.3V logic? A: No, the AT27C512R-70JU typically requires a 5V power supply, and might not be compatible with 3.3V logic levels.
Q: What is the pinout for the AT27C512R-70JU in PLCC? A: The PLCC version of the AT27C512R-70JU has the same pin functions but is packaged differently, with leads around the perimeter.
Q: How is the AT27C512R-70JU different from other EEPROMs? A: The AT27C512R-70JU is specifically a 512Kb EEPROM with a standard 28-pin configuration, offering high-speed data access and reliability.
Q: Can the AT27C512R-70JU be used for high-volume applications? A: Yes, the AT27C512R-70JU is suitable for high-volume applications requiring non-volatile storage, such as embedded systems or consumer electronics.
This concludes the detailed pin function explanation, packaging information, and FAQ list for the AT27C512R-70JU.