Datasheet Microchip MIC2777 — 数据表

MIC2777 Micrel, Inc. MIC2777
Dual Micro-Power Low Voltage Supervisor General Description Features The MIC2777 is a dual power supply supervisor that provides
under-voltage monitoring, manual reset capability, and poweron reset generation in a compact 5-pin SOT package. Features include two under-voltage detectors, one п¬Ѓxed and one
adjustable, and both active-high and active-low reset outputs.
One under-voltage detector compares VDD against a п¬Ѓxed
threshold. Ten factory-programmed thresholds are available.
The other under-voltage detector is user-adjustable.
The reset outputs are asserted for no less than 140ms at
power-on and any time VDD or the input voltage drops below
the corresponding reference voltage. They remain asserted
for the timeout period after the input voltage and VDD subsequently rise back above the threshold boundaries. A reset
can be generated at any time by pulling down on the adjustable input. Hysteresis is included to prevent chattering due
to noise. Typical supply current is a low 3.5ВµA. Monitors two independent power supplies for under-voltage conditions One п¬Ѓxed and one user adjustable input 1.5% theshold accuracy Choice of factory-programmed thresholds User-adjustable input can monitor supplies as low as
0.3V Generates 140ms (minimum) power-on RESET pulse Manual reset capability Both active-high and active-low RESET outputs Input may be pulled above VDD (abs. max.) /RST output valid down to 1.2V Ultra-low supply current, 3.5ВµA typical Rejects brief input transients IttyBittyв„ў 5-pin SOT-23 package Applications Monitoring processor, ASIC, or FPGA core and I/O voltages Computer systems PDAs, hand-held PCs Embedded controllers Telecommunications systems Power supplies Wireless / Cellular systems Networking hardware Ordering Information
Part Number
Standard Marking Pb-Free MIC2777-XXBM5 UNXX Marking MIC2777-XXYM5 Typical Application Junction Tem. Range Package –40ºC to +85ºC SOT-23-5 UNXX MICROPROCESSOR
VCORE VCORE 1.0V VI/O VI/O 1.8V
R1 MIC2777
VDD /RST
IN R2 /RESET GND RST GND Manual
Reset
OTHER
LOGIC Typical Application …