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ASM690A Datasheet(PDF) 2 Page - ON Semiconductor

Part # ASM690A
Description  Power Supply Supervisor
Download  12 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ASM690A Datasheet(HTML) 2 Page - ON Semiconductor

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ASM690A/692A, ASM802L/802M, ASM805L
http://onsemi.com
2
Figure 1. Typical Operating Circuit
Figure 2. Block Diagram
Table 1. PIN DESCRIPTION
Pin Number
Name
Function
ASM690A/ASM692A
ASM802L/ASM802M
ASM805L
1
1
VOUT
Voltage supply for RAM. When VCC is above the reset threshold, VOUT connects
to VCC through a P−Channel MOS device. If VCC falls below the reset threshold,
this output will be connected to the backup supply at VBATT (or VCC, whichever is
higher) through the MOS switch to provide continuous power to the CMOS RAM.
2
2
VCC
+5 V power supply input.
3
3
GND
Ground.
4
4
PFI
Power failure monitor input. PFI is connected to the internal power fail comparat-
or which is referenced to 1.25 V. The power fail output (PFO) is active LOW but
remains HIGH if PFI is above 1.25 V. If this feature is unused, the PFI pin should
be connected to GND or VOUT.
5
5
PFO
Power−fail output. PFO is active LOW whenever the PFI pin is less than 1.25 V.
6
6
WDI
Watchdog input. The WDI input monitors microprocessor activity. An internal
timer is reset with each transition of the WDI input. If the WDI is held HIGH or
LOW for longer than the watchdog timeout period, typically 1.6 seconds, RESET
(or RESET) is asserted for the reset pulse width time, tRS, of 140 ms, minimum.
7
RESET
Active−LOW reset output. When triggered by VCC falling below the reset
threshold or by watchdog timer timeout, RESET pulses low for the reset pulse
width tRS, typically 200 ms. It will remain low if VCC is below the reset threshold
(4.65 V in ASM690A / ASM802L and 4.4 V in the ASM692A / ASM802L) and
remains low for 200 ms after VCC rises above the reset threshold.
7
RESET
Active−HIGH reset output. The inverse of RESET.
8
8
VBATT
Auxiliary power or backup−battery input. VBATT should be connected to GND if
the function is not used. The input has about 40 mV of hysteresis to prevent rapid
toggling between VCC and VBATT.


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