Dallas, Tex.Dallas Semiconductor, a wholly owned subsidiary of Maxim Integrated Products, has developed a memory device that integrates mixed-signal and nonvolatile memory functions.
According to Dallas Semiconductor, the DS28DG02 provides typically a savings of 20% in PCB space and 30% in cost. Applications include communication, medical, consumer, and industrial end equipment.
“Prior to the availability of the DS28DG02, equipment designers typically used up to four discrete ICs to implement equivalent functionality,” said Scott Jones, business director for the company's mixed-signal memory products, including an EEPROM, real-time clock (RTC), port expander, and CPU supervisor/monitor.
The DS28DG02 has a 2kb EEPROM array, which meets the size requirements to store system configuration, calibration, operational settings, etc., required by most applications. In addition, page boundary-programmable write-protection modes are provided to safeguard stored data.
Twelve bidirectional, user-programmable GPIO channels offer a high level of flexibility and convenience for adapting to a wide range of applications. The GPIOs can be configured as input or output, open drain or push-pull, and can be programmed through the EEPROM registers to power up in a defined state. Additionally, the GPIOs can sink up to 22mA when operating at 3.3V, which makes them suitable for LED on/off direct control.
The DS28DG02's RTC provides a BCD formatted clock/calendar with a programmable time/calendar alarm. The RTC can be powered from an external backup power source, such as a lithium coin cell, in the absence of VCC power.
The DS28DG02 is said to be the first device to provide a user-programmable, supervisory function that actively monitors the health of the backup battery.
The standard device operates at 3.3V, ±5%. Other versions are available that operate at 5V, 3V, 2.5V, and some with 5% and 10% trip point options. TheDS28DG02 is specified over the -40°C to +85°C industrial temperature range. Package options include 28-pin TSSOP and 36-pin, 6mm x 6mm TQFN.
Pricing: Starts at $1.81 in (1,000-up, FOB USA).
Datasheet: click here.
Dallas Semiconductor, 1-800-998-8800, www.maxim-ic.com