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AS1901C23 Datasheet(PDF) 6 Page - ams AG |
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AS1901C23 Datasheet(HTML) 6 Page - ams AG |
6 / 9 page www.austriamicrosystems.com Revision 1.51 6 - 9 AS1901, AS1902, AS1903 Data Sheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description Interfacing to Microprocessors with Bi-Directional Reset Pins The device has an open drain RESETN output, which enables easy interfacing to microprocessors (µP) with bi-direc- tional reset pins, such as the Motorola 68HC11. The RESETN pin of the microcontroller (µC) can be connected directly to the µP supervisor's RESETN output with a single pull-up resistor (see Figure 1 on page 1). Negative-Going VDD Transients The device is optimized to ignore short-duration, negative-going VDD transients (glitches) in order to avoid incorrect resets. In the graph Maximum Transient Duration vs. Reset Threshold Overdrive (page 6), the conditions are shown, for which the reset pulses are not generated. In the graph the maximum pulse width that a negative VDD transient may have when a reset signal is generated. As the amplitude of the transient increases, the maximum allowable pulse width decreases. Options Table 4. Coding of Factory-trimmed Reset Active Time-Out Period Device Suffix tTP in Milliseconds Min Typ Max AS190x_xx A 3 5 8 AS190x_xx B 12 20 32 AS190x_xx C 60 100 160 AS190x_xx D 300 500 800 Table 5. Output Variants Device Output Functionality AS1901xxx Active Low (RESETN) AS1902xxx Active High (RESET) AS1903xxx Open Drain (RESETN) Table 6. Coding of Factory-Trimmed Reset Threshold Voltages Device Suffix Reset Threshold Voltage, VTH in V TA = +25°C TA = -40 to +85°C Min Typ Max Min Max AS190xx__ 22 2.167 2.2 2.233 2.145 2.255 AS190xx__ 23 2.285 2.32 2.355 2.262 2.378 AS190xx__ 24 2.364 2.4 2.436 2.340 2.460 AS190xx__ 25 2.463 2.5 2.538 2.438 2.563 AS190xx__ 26 2.591 2.63 2.669 2.564 2.696 AS190xx__ 27 2.660 2.7 2.741 2.633 2.768 AS190xx__ 28 2.758 2.8 2.842 2.730 2.870 AS190xx__ 29 2.886 2.93 2.974 2.857 3.003 AS190xx__ 30 2.955 3.0 3.045 2.925 3.075 AS190xx__ 31 3.034 3.08 3.126 3.003 3.157 |
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