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TC1270RERC bảng dữ liệu(PDF) 1 Page - Microchip Technology |
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TC1270RERC bảng dữ liệu(HTML) 1 Page - Microchip Technology |
1 / 12 page © 2002 Microchip Technology Inc. DS21381B-page 1 TC1270/TC1271 Features • Precision VCC Monitor for 1.8V, 2.7V, 3.0V, 3.3V and 5.0V Nominal Supplies • Manual Reset Input • 140msec Minimum RESET, RESET Output Duration • RESET Output ValidtoVCC = 1.0V (TC1270) •Low 7 µA Supply Current •VCC Transient Immunity • Small 4-Pin SOT-143 Package • No External Components • Replacement for MAX811/812 and Offers a Lower Threshold Voltage Option Applications • Computers • Embedded Systems • Battery Powered Equipment • Critical µP Power Supply Monitoring Device Selection Table NOTE: “x” denotes a suffix for VCC threshold (see table below) Package Type General Description The TC1270 and TC1271 are cost-effective system supervisor circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. A manual reset input is provided to override the reset monitor, and is suitable for use as a push-button reset. No external components are required. The reset output is driven active within 20 µsec (4µsec for F version) of VCC falling through the reset voltage threshold. RESET is maintained active for a minimum of 140msec after VCC rises above the reset threshold. The TC1271 has an active-high RESET output while the TC1270 has an active-low RESET output. The output of the TC1270 is valid down to VCC =1V. Both devices are available in a 4-Pin SOT-143 package. The TC1270/TC1271 devices are optimized to reject fast transient glitches on the VCC line. Low supply current of 7 µA(VCC = 3.3V) makes these devices suitable for battery powered applications. Typical Operating Circuit Part Number Package Temp. Range TC1270xERC 4-Pin SOT-143 -40°C to +85°C TC1271xERC 4-Pin SOT-143 -40°C to +85°C Suffix* Reset VCC Threshold (V) L4.63 M4.38 T3.08 S2.93 R2.63 F1.75 *Custom thresholds available, contact factory. VCC TC1270 RESET GND TC1270 TC1271 1 2 TC1271 (RESET) 3 4 MR 4-Pin SOT-143 TC1270 VCC VCC VCC RESET RESET Input (Active Low) GND GND Processor MR Push- Button 4-Pin µP Reset Monitors |
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