LM74A Datasheet | National Semiconductor

Description The LM74A is a temperature sensor, Delta-Sigma analog-todigital converter with an SPI and MICROWIRE patible interface in die form. The host can query the LM74A at any time to read temperature. A shutdown mode decreases power consumption to less than 10 µA. This mode is useful in systems where low average power consumption is critical. This particular data sheet applies to the LM74 in die form. The LM74 is available in the SO-8 package as well as an 5-Bump micro SMD package please refer to LM74 data sheet for detailed specifictions pertaining to the packaged parts. The LM74A has 12-bit plus sign temperature resolution (0.0625˚C per LSB) while operating over a temperature range of - 40˚C to +150˚C. The LM74A-5 MDA accuracy of ±3.5˚C is specified over a temperature range of 0˚C to +150˚C. The LM74A’s 4.5V to 5.5V or 3.0V to 3.6V supply voltage range, low supply current and simple SPI interface make it ideal for a wide range of applications. These include thermal management and protection applications in hard disk drives, printers, electronic test equipment, and office electronics. Applications n System Thermal Management n Personal puters n Disk Drives n Office Electronics n Electronic Test Equipment Features n 0.0625˚C temperature resolution. n Shutdown mode conserves power between temperature reading n SPI and MICROWIRE Bus interface n LM74 is also available in a 5-Bump micro SMD and 8-pin MSOP Key Specifications j Supply Voltage j Supply Current LM74A-5 LM74A-3 operating j LM74A-5 MDA Temperature Accuracy shutdown 0˚C to 140˚C 140˚C to 150˚C 4.5V to 5.5V 3.0V to 3.6V 310µA (typ) 520µA (max) 8µA (typ) ±3.0˚C(max) ±3.5˚C(max) Simplified Block Diagram MICROWIRE™ is a trademark of National Semiconductor Corporation. TRI-STATE® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS200177 .national. Connection Diagram LM74A Bond Pad Layout TOP VIEW 1.40mm x 1.57 mm...