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ADM1232 Datasheet(PDF) 4 Page - Analog Devices

Part No. ADM1232
Description  Microprocessor Supervisory Circuit
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM1232 Datasheet(HTML) 4 Page - Analog Devices

   
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ADM1232
–4–
REV. B
PIN FUNCTION DESCRIPTIONS
Mnemonic
Function
PB RESET
Push Button Reset Input. This debounced input will ignore pulses of less than 1 ms and is guaranteed to re-
spond to pulses greater than 20 ms.
TD
Time Delay Set allows the user to select the maximum amount of time the ADM1232 will allow the
STROBE
input to remain inactive (i.e.,
STROBE is not receiving any high-to-low transitions), without forcing the
ADM1232 to generate a RESET pulse. (See
STROBE specifications, Figure 4 and the note on STROBE
timeout selection.)
TOLERANCE
Tolerance Input. This input will determine how much the supply voltage will be allowed to decrease (as a per-
centage tolerance) before a RESET is asserted. Connect to VCC for 10% and GND for 5%.
GND
0 V ground reference for all signals.
RESET
Active high logic output. Will be asserted when:
1. VCC decreases below the amount specified by the TOLERANCE input or,
2.
PB RESET is forced low or,
3. If there are no high-to-low transitions within the limits set by TD at
STROBE or,
4. During power-up.
RESET
Inverse of RESET, with an open drain output.
STROBE
The
STROBE input is used to monitor the activity of a microprocessor. If there are no high-to-low transi-
tions within the time specified by TD, a reset will be asserted.
VCC
Power supply input +5 V.
PIN CONFIGURATIONS
R-16
N-8 and R-8
RM-8
14
13
12
11
16
15
10
9
8
1
2
3
4
7
6
5
TOP VIEW
(Not to Scale)
ADM1232
NC = NO CONNECT
NC
STROBE
NC
NC
NC
TD
NC
NC
NC
TOLERANCE
GND
PB RESET
RESET
RESET
NC
VCC
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
ADM1232
PB RESET
RESET
STROBE
VCC
TD
TOLERANCE
GND
RESET
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
ADM1232
PB RESET
RESET
STROBE
VCC
TD
TOLERANCE
GND
RESET


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