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CAT28C162S16I-30TE13 Datasheet(PDF) 10 Page - Catalyst Semiconductor |
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CAT28C162S16I-30TE13 Datasheet(HTML) 10 Page - Catalyst Semiconductor |
10 / 12 page 9-104 CAT25CXXX Stock No. 21085-01 4/98 Advanced DEVICE OPERATION FOR THE SUPERVISORY CIRCUIT Reset Controller Description The CAT25CXXX provides a precision RESET control- ler that ensures correct system operation during brown- out and power-up/down conditions. It is configured with open drain RESET outputs. During power-up, the RESET outputs remain active until VCC reaches the VTH threshold and will continue driving the outputs for approximately 200ms (tPURST) after reaching VTH. After the tPURST timeout interval, the device will cease to drive reset outputs. At this point the reset outputs will be pulled up or down by their respective pull up/pull down devices. During power-down, the RESET outputs will begin driving active when VCC falls below VTH. The RESET outputs will be valid so long as VCC is >1.0V (VRVALID). The RESET pins are I/Os; therefore, the CAT25CXXX can act as a signal conditioning circuit for an externally applied reset. The inputs are level triggered; that is, the RESET input in the 25CXXX will initiate a reset timeout after detecting a high and the RESET input in the 25CXXX will initiate a reset timeout after detecting a low. Watchdog Timer The Watchdog Timer provides an independent protec- tion for microcontrollers. During a system failure, the CAT25CXXX will respond with a reset signal after a time out period (the time out period is defined by the watchdog timer bits WD0 an d WD1) for lack of activity. 25CXXX is designed with the Watchdog Timer feature on the CS input. For the 25CXXX, if the microcontroller does not toggle the CS pin within the time out period the Watchdog Timer times out. This will generate a reset condition on reset outputs. The Watchdog Timer is cleared by any transition on CS. As long as the reset signal is asserted, the Watchdog Timer will not count and will stay cleared. Reset Threshold Voltage From the factory the 25CXXX is offered in six different variations of reset threshold voltages. They are 4.50- 4.75V, 4.25-4.50V, 3.00-3.15V, 2.85-3.00V, 2.55-2.70V and 1.7-1.8V. To provide added flexibility to design engineers using this product, the 25CXXX is designed with an additional feature of programming the reset threshold voltage. This allows the user to change the existing reset threshold voltage to one of the other five reset threshold voltages. Once the reset threshold voltage is selected it will not change even after cycling the power, unless the user uses the programmer to change the reset threshold voltage. However, the programming function is available only through third party programmer manufacturers. Please call Catalyst for a list of programmer manufacturers who support this function. Figure 8. Page Write Instruction Timing SK SI CS SO 0 0 0 0 0 0 1 0 ADDRESS Data Byte 1 012345678 21 22 23 24-31 32-39 Data Byte 2 Data Byte 3 Data Byte N |
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