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PDF SP810 Data sheet ( Hoja de datos )
| Número de pieza | SP810 | |
| Descripción | (SP809 / SP810) 3 Pin Microprocessor Supervisor Circuit | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
FEATURES
■ Ultra Low Supply Current 1µA (typ.)
■ Guaranteed Reset valid to VCC = 0.9V
■ 140 ms Min. Power-On Reset Pulse Width
■ Internally Fixed Threshold 2.3V, 2.6V, 2.9V,
3.1V, 4.0V, 4.4V, 4.6V
■ Tight Voltage Threshold Tolerance: 1.5%
■ Offered in a 3 Pin SOT-23 Package
VCC
SP809
3 Pin SOT-23
GND RESET
Now Available in Lead Free Packaging
Part Number
SP809N
SP809
SP810
Output Type
Open-Drain Active Low
Push-Pull Active Low
Push-Pull Active High
APPLICATIONS
■ Portable Electronic Devices
■ Electrical Power Meter
■ Digital Still Camera
■ µP Power Monitoring
DESCRIPTION
The SP809/SP810 are low power microprocessor (µP) supervisory circuits used to monitor
power supplies in µP and digital systems. They provide applications with benefits of circuit
reliability and low cost by eliminating external components. If the VCC supply voltage falls below
preset threshold then a reset signal is asserted for at least 140ms after VCC has risen above the
reset threshold. Both the SP809 and SP810 were designed with a reset comparator to help
identify invalid signals, which last less than 140ms. The only difference between them is that they
have an active-low RESET output and active-high RESET output, respectively. Low supply
current (1µA) makes SP809/SP810 ideal for portable equipment. The devices are available in
3 pin SOT-23 package.
TYPICAL APPLICATION CIRCUIT
VCC
VCC
RESET
(RESET)
VCC
µP
RESET
GND
GND
Push-Pull output
Date: 5/02/06 Rev B
SP809/810, 3 Pin Microprocessor Supervisor Circuit
1
© Copyright 2006 Sipex Corporation
1 page  
PIN DESCRIPTION
Pin Name
GND
RESET (SP809)
RESET (SP810)
VCC
Description
Ground.
Active low output pin. RESET Output remains low while VCC is below the reset
threshold.
Active high output pin. RESET Output remains high while VCC is below the reset
threshold.
Supply Voltage
µP will be activated at a valid reset state.
These µP supervisory circuits assert reset to
prevent code execution errors during power-
up, power-down, or brownout conditions.
Reset is guaranteed to be a logic low for
VTH>VCC>0.9V. Once VCC exceeded the reset
threshold, an internal timer keeps RESET low
for the reset timeout period; after this interval,
RESET goes high.
If a brownout condition occurs (V drops
CC
below the reset threshold), RESET goes low.
Any time VCC goes below the reset threshold,
the internal timer resets to zero, and RESET
goes low. The internal timer is activated after
VCC returns above the reset threshold, and
RESET remains low for the reset timeout
period.
Negative-Going VCC Transients
In addition to issuing a reset to the µP during
power-up, power-down, and brownout condi-
tions, SP809 series are relatively resistant to
short-duration negative-going VCC transient.
Ensuring a Valid Reset Output Down to
VCC= 0
When VCC falls below 0.9V, SP809 RESET
output no longer sinks current; it becomes
an open circuit. In this case, high-imped-
ance CMOS logic inputs connecting to
RESET can drift to undetermined voltages.
Therefore, SP809/810 with CMOS is
perfect for most applications of VCC down to
0.9V.
DETAILED DESCRIPTION
Benefits of Highly Accurate Reset
Threshold
SP809/810 with specified voltage as 5V±10%
or 3V±10% are ideal for systems using a
5V±5% or 3V±5% power supply. The reset is
guaranteed to assert after the power supply
falls below the minimum specified operating
voltage range of the system ICs. The
pretrimmed thresholds are reducing the range
over which an undesirable reset may occur.
APPLICATION INFORMATION
However in applications where RESET
must be valid down to 0V, adding a pull-
down resistor to RESET causes any
leakage currents to flow to ground, holding
RESET low.
Interfacing to µP with Bidirectional
Reset Pins
The RESET output on the SP809N is open
drain, this device interfaces easily with µPs
that have bidirectional reset pins. Connect-
ing the µP supervisor's RESET output
directly to the microcontroller's RESET pin
with a single pull-up resistor allows either
device to assert reset.
Date: 5/02/06 Rev B
SP809/810, 3 Pin Microprocessor Supervisor Circuit
5
© Copyright 2006 Sipex Corporation
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SP810.PDF ] | |
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