ASM705CSA / Alliance Semiconductor Corporation

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Part No.	ASM705CSA
Manufacturer	ALSC
Size	198 Kbytes
Pages	16 pages
Description	Low Power uP Supervisor Circuits

Datasheet Summary with AI

1. Device Identification:

️· Products: This document pertains to the ASM705, ASM706, ASM707, ASM708, and ASM813L microcontroller supervisor circuits.

2. Functionality & Purpose:

️· Supervision: These devices are designed to monitor the power supply of a microcontroller (µP) and provide features for reliable operation.
️· Key Features:
- Watchdog Timer (WDT): A timer that must be periodically "kicked" by the microcontroller to prevent system lockups. If the timer expires, it resets the microcontroller. (tWD = 1.00-2.25 seconds)
- Power-Up Reset: Detects when the power supply voltage is too low.
- MR (Monitor Reset) Output: Indicates the status of the power supply (e.g., low voltage condition).
- PFO (Power Fail Output): Signals a power fail condition.
- Reset Output: Provides a reset signal to the microcontroller.
- WDI (Watchdog Input): Used to "kick" the watchdog timer.

3. Electrical Characteristics (Key Values):

️· Supply Voltage: Not explicitly stated, but assumed to be a range supporting microcontroller operation.
️· PFI Input Threshold: 1.2 - 1.3V (voltage required for the Power Fail Input to be active)
️· MR Input Thresholds: VIH = 3.5V, VIL = (not specified directly, implied to be around 0.8V)
️· Reset Output Voltage (Low): Approximately 0.4V at specified sink currents.
️· MR Pulse Width (tWP): 50 ns (for kicking the watchdog timer)
️· WDO Output Voltage (Low): Approximately 0.4V at specified sink currents.
️· Reset Pulse Width: 140-280ms

4. Package Information (MicroSO - 8-Pin):

️· Dimensions (in Inches and Millimeters): The document provides detailed package dimensions for the MicroSO package, including:
- Overall dimensions (A, A1, A2)
- Pin spacing (e)
- Lead length (L)
- Lead angle (a)

5. Important Notes:

️· Document Revision: This is a document from February 2005, so specifications may have changed in newer versions.
️· BSC (Basic Dimension): Indicates a critical dimension with tight tolerances.
️· Watchdog Timer Period: The watchdog timer period is a crucial element for reliable operation and has a range of 1.00-2.25 seconds.