January 18, 2001 - National Semiconductor Corporation (NYSE:NSM) today announced a family of supervisory ICs with a variety of factory-programmable features that can be configured in hundreds of possible combinations. Housed in the chip-scale micro SMD package - the world's smallest - the LM3700 family uses EEPROM technology to perform the following functions in any of 281 threshold voltages.
- Power On Reset (POR), asserted during power-up, power-down and brownout conditions. RESET (bar) is guaranteed down to supply voltage (Vcc) of 1.0V.
- Four reset timeout periods provide maximum flexibility for system timing requirements.
- MANUAL RESET input.
- Four output types: CMOS totem-pole or open drain; each active high or active low.
- Power fail (PF) comparator for power fail warning, or to monitor a second input voltage guarding the system against catastrophic blackout/brownout conditions.
- Watchdog with separate output and choice of four timeout periods.
- Low-line output (LLO) gives an advanced warning of impending power failure, thereby enabling safe system shutdown.
"National's EEPROM technology gives customers extraordinary flexibility by making it possible for them to select the precise combination of supervisory functions they need for a specific application." said Ed Lam, National's director of power management products. "EEPROM technology also shortens our customers' time-to-market by allowing us to factory program a custom set of supervisory functions and deliver prototypes within two weeks."
The LM3700 supervisory family is designed to monitor power supplies in intelligent instruments, cellular phones, computers, PDAs, pagers and any other systems containing microprocessors, microcontrollers or DSPs. With an ambient operating temperature range from -40C to +85C, LM3700 supervisory ICs are also suited for industrial and automotive applications.
The LM3700 family of supervisory ICs is immune to short voltage transients. They are designed to monitor power supplies and battery-controlled functions in systems without backup batteries. Reset threshold accuracy is an ultra-low ?0.5% at room temperature and ?2.0% over the ambient operating temperature range, while keeping quiescent current at a low 28 microamps (typical). Since the LM3700 family can be programmed to hundreds of different reset threshold voltages between 2.2V and 5.0V in 10mV increments, they can be used to monitor power supplies of varying tolerances.
Price and Availability
Available now in production quantities, the LM3700 family includes 14 standard combinations (LM3700 to LM3713) or hundreds of possible factory-programmed customized versions. In the 9-bump micro SMD or MSOP-10 packages, prices range from $0.40 to $1.20 each in 1000-unit lots. Customized versions require a minimum order of $25K. For more information on the LM3700 family, please visit our World Wide Web site at http://www.national.com/pf/LM/LM3700.html.
About National Semiconductor
National Semiconductor is the premier analog company driving the information age. Combining real-world analog and state-of-the-art digital technology, the company is focused on the fast growing markets for wireless handsets; information appliances; information infrastructure; and display, imaging and human interface technologies. With headquarters in Santa Clara, California, National reported sales of $2.1 billion for its last fiscal year and has about 10,500 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com.
