GD25LQ64CSIG

GD25LQ64CSIG is GigaDevice’s 64-Mbit serial flash memory in an 8‑pin package used for firmware and data storage in microcontrollers and SoCs. It offers a SPI‑compatible interface with Quad I/O (QIO/DIO) support for higher throughput.
Key points:
- Density: 64 Mbit (8 MB) of non-volatile flash
- Interface: Standard SPI plus dual/quad I/O modes
- Voltage: 2.7–3.6 V
- Features: 256-byte page program, 4 KB sectors, 32 KB and 64 KB blocks, chip erase; fast read and deep power‑down; standard JEDEC commands
- Package: 8‑pin SOP (SIL/SOIC) style, RoHS-compliant
- Applications: firmware/code storage, bootloaders, data logging, and firmware updates in embedded systems
In short, a high‑speed, low‑voltage serial flash suitable for compact embedded systems requiring reliable, non‑volatile storage.

Equivalent 64 Mbit serial flash devices from other brands (8-pin SOP, similar SPI/Quad IO options):
- Winbond W25Q64FV
- Macronix MX25L6406E
- Spansion S25FL064K
- ISSI IS25LP064D
- Adesto AT25DF064A
- Microchip SST25VF064C
- Puya P25Q64H

Here are the key features of GD25LQ64CSIG (64‑Mbit serial flash):
- Capacity: 64 Mbit (8 MB) of flash memory
- Interface: SPI-compatible with dual/quad I/O (DQ lines) for higher throughput
- Voltage: 2.7–3.6 V operation
- Speed: Fast read up to about 104 MHz (Quad/Dual I/O modes available)
- Memory organization: 256-byte page program, with sector/block erase architecture (4 KB sectors; larger blocks available)
- Power: Deep power-down mode and low-power standby
- Longevity: Typical erase/program endurance around 100k cycles
- Temperature: Industrial range, −40°C to +85°C
- Package: 8-pin package (typical for this device family)
Note: exact block sizes and supported modes can vary by revision; consult the datasheet for precise erase block maps and mode support.

- Pin count: 8 pins (SOP-8/SOIC-8)
- Function: 64‑Mbit SPI serial flash memory (GD25LQ64C series) with standard SPI interface
- Pins typically: VCC, GND, CS#, CLK, DI (MOSI), DO (MISO), WP#, HOLD#
- WP# provides write protection; HOLD# used to pause SPI communication when needed (often tied high if not used)

- Manufacturer: GigaDevice Semiconductor Inc. (GigaDevice)
- What kind of company: A Chinese fabless semiconductor company that designs and markets memory products, especially NOR flash (SPI flash) and related storage solutions for embedded, consumer, automotive, and industrial applications.

GD25LQ64CSIG is a 64M-bit serial flash memory (Quad SPI) used for:
- Boot/firmware memory for microcontrollers and SoCs
- Code storage for embedded systems and consumer electronics
- Firmware update reservoirs (in-field OTA or local updates) for IoT, routers/switches, set-top boxes
- Data logging and configuration storage in sensors, meters, industrial controllers
- Automotive and industrial electronics for firmware/config data
- Peripheral devices (printers, cameras, etc.) needing non-volatile storage

GD25LQ64CSIG uses an 8-pin SOP (SOIC-8) package.