Serial Quad I/O SuperFlash memory in low-power 4-Mbit and 8-Mbit

January 19, 2015 // By Graham Prophet
Microchip Technology has added to its 1.8V Serial Quad I/O (SQI) SuperFlash Memory with the SST26WF080B and SST26WF040B devices. These devices offer 4-Mbit and 8-Mbit of memory and are manufactured with Microchip’s SuperFlash technology, for fastest erase times and reliability.

The SST26WF080B/040B provide the fastest erase times of any competing device. Sector and block erase commands are completed in just 18 msec and a full chip erase operation is completed in 35 msec. Competing devices require in the range of 5 to 15 seconds to complete a full chip erase operation, Microchip says. The fast erase times can provide a significant cost savings to customers by minimising the time required for testing and firmware updates, therefore increasing their manufacturing throughput.

The SQI interface is a high-speed 104 MHz quad I/O serial interface which allows for high-data throughput in a low pin-count package. This interface enables low latency execute-in-place (XIP) capability, allowing programs to be stored and executed directly from the Flash memory and eliminating the need for code shadowing on a RAM device. The SST26WF080B/040B provides faster data throughput than a comparable x16 parallel Flash device without the associated high cost and high-pin count of parallel Flash. The SQI interface also offers full command-set backwards compatibility to traditional Serial Peripheral Interface (SPI) protocol.

Standby current consumption is 10 µA typical and a deep power-down mode further reduces current consumption to 1.8 µA typical. Active read current at 104 MHz is 15 mA typical. The combination of 1.8V operation with low-power consumption and small form factor packaging makes the SST26WF080B/040B a suitable choice for applications such as mobile handsets, Bluetooth headsets, GPS, camera modules, hearing aids and any battery-powered devices.

The SST26WF080B/040B offers 100 years data retention and device endurance of over 100,000 erase/write cycles. Enhanced safety features include software write protection of individual blocks for flexible data/code protection and a One-Time Programmable (OTP) 2 kByte Secure ID area. These features protect against unauthorised access and malicious read, program and erase intentions. The device also includes a JEDEC-compliant Serial Flash Discoverable Parameter (SFDP) table, which contains identifying information about the function and capability of the SST26WF080B/040B in order to simplify software