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CAT140041JWI-GT3 데이터시트(PDF) 5 Page - Catalyst Semiconductor |
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CAT140041JWI-GT3 데이터시트(HTML) 5 Page - Catalyst Semiconductor |
5 / 14 page CAT140xx © 2006 Catalyst Semiconductor, Inc. 5 Doc. No. 1117 Rev. A Characteristics subject to change without notice PIN DESCRIPTION RESET/RESET ¯¯¯¯¯¯ : RESET OUTPUT This output is available in two versions: CMOS Active Low (CAT140xx9) and CMOS Active High (CAT140xx1). Both versions are push-pull outputs for high efficiency. SDA: SERIAL DATA ADDRESS The Serial Data I/O pin receives input data and transmits data stored in EEPROM. In transmit mode, this pin is open drain. Data is acquired on the positive edge, and is delivered on the negative edge of SCL. SCL: SERIAL CLOCK The Serial Clock input pin accepts the Serial Clock generated by the Master. A0, A1, A2: Device Address Inputs The Address inputs set the device address when cascading multiple devices. When not driven, these pins are pulled LOW internally. DEVICE OPERATION The CAT140xx products combine the accurate voltage monitoring capabilities of a standalone voltage supervisor with the high quality and reliability of standard EEPROMs from Catalyst Semiconductor. RESET CONTROLLER DESCRIPTION The reset signal is asserted LOW for the CAT140xx9 and HIGH for the CAT140xx1 when the power supply voltage falls below the threshold trip voltage and remains asserted for at least 140ms (tPURST) after the power supply voltage has risen above the threshold. Reset output timing is shown in Figure 1. The CAT140xx devices protect μPs against brownout failure. Short duration VCC transients of 4μsec or less and 100mV amplitude typically do not generate a Reset pulse. Figure 2 shows the maximum pulse duration of negative- going VCC transients that do not cause a reset condition. As the amplitude of the transient goes further below the threshold (increasing VTH - VCC), the maximum pulse duration decreases. In this test, the VCC starts from an initial voltage of 0.5V above the threshold and drops below it by the amplitude of the overdrive voltage (VTH - VCC). Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Overdrive Voltage Figure 1. RESET Output Timing RESET OVERDRIVE VTH - VCC [mV] TAMB = 25ºC CAT140xxM CAT140xxZ VCC PURST t PURST t RPD t RVALID V V TH RESE T RESE T CAT140xx9 CAT140xx1 RPD t |
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