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SS8039L293TCTR Fiches technique(PDF) 5 Page - Silicon Standard Corp.

No de pièce SS8039L293TCTR
Description  Microprocessor Voltage Monitor with Manual Reset
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Fabricant  SSC [Silicon Standard Corp.]
Site Internet  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS8039L293TCTR Fiches technique(HTML) 5 Page - Silicon Standard Corp.

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SS8039
www.SiliconStandard.com
5 of 7
Rev.2.02 1/06/2004
Pin Description
PIN
NAME
FUNCTION
1
GND
Ground
RESET
(SS8039L)
RESET
Output remains low while VCC is below the reset threshold, and for at least 140ms after VCC
rises above the reset threshold.
2
RESET
(SS8039H)
RESET Output remains high while V CC is below the reset threshold, and for at least 140ms after VCC
rises above the reset threshold.
3
MR
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is
low and for
at least 140ms after MR returns high, This active-low input has an internal 20kΩ pull- up
resistor. It can be driven from a TTL or CMOS-logic line, or shorted to ground with a switch. Leave
open if unused.
4
VCC
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The SS8039L and SS8039H assert reset
to prevent
code-execution errors during power-up,
power-down, or brownout conditions. They assert a reset
signal whenever the VCC supply voltage declines below a
preset threshold, keeping it asserted for at least 140ms
after VCC has risen above the reset threshold.
The SS8039L/SS8039H have a push-pull output stage.
The manual reset input (MR) can also initiate a reset.
See the Manual Reset Input Section.
Manual Reset Input
Fig.1 Maximum Transient Duration Without
Many µP-based products require manual reset capability
Causing a Reset Pulse vs. Reset Comparator Overdrive
allowing the operator, a test technician, or external logic
circuitry to initiate a reset. A logic low on MR asserts
reset. Reset remains asserted while MR is low, and for
the Reset Active Timeout Period (t RP) after
MR
returns
high. This input has an internal 20k
Ω pull-up resistor, so
it can be left open if it is not used. MR can be driven with
TTL or CMOS-logic levels, or with open-drain / collector
outputs. Connect a normally open momentary switch
from MR to GND to create a manual-reset function;
external debounce circuitry is not required. If MR is
driven from long cables or if the device is used in a
noisy environment, connecting a 0.1µF capacitor from
MR
to ground provides additional noise immunity.
Figure2. RESET Valid to VCC = Ground Circuit
V
CC
RESET
GND
R1
100k
V
CC
RESET
GND
SS8039
R1
100k
0
100
200
300
400
500
600
1
10
100
1000
Reset Comparator Overdrive, V TH-VCC (mV)


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