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PDF DS1836D Data sheet ( Hoja de datos )

Número de pieza DS1836D
Descripción 3.3V/5V MicroManager
Fabricantes Dallas Semiconductor 
Logotipo Dallas Semiconductor Logotipo



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DS1836/A/B/C/D
3.3V/5V MicroManager
FEATURES
§ 5V or 3.3V power-on reset
§ True 3V operation power switch
§ Switches to battery at 3.8V (2.6V for 3.3V
versions)
§ Excellent for systems designed to operate
with dual power supplies
§ Asserts resets during power transients
§ Maintains reset for 350ms after VCC returns to
an in-tolerance condition
§ Reduces need for discrete components
§ Precision temperature-compensated voltage
reference and voltage sensor
§ 8-pin DIP or space saving 8-pin SO surface
mount available
§ CMOS reset output for low current operation
§ Operating temperature of -40°C to +85°C
§ Perfect for PIC microprocessor applications
PIN ASSIGNMENT
VCC 1
8 RST(*RST)
VBAT
2
7 NMI
NC 3
6 IN
VOUT
4
5 GND
8-Pin DIP (300mil)
VCC
18
RST(*RST)
VBAT
27
NMI
NC
36
IN
VOUT
45
GND
8-Pin SO (150mil)
DS1836A/C (*DS1836B/D)
PIN DESCRIPTION
VCC
VBAT
NC
VOUT
GND
IN
- Power Supply Input
- Battery Supply Input
- No Connect
- Power Supply Output
- Ground
- Sense Input
NMI - Non-maskable Interrupt
RST (*RST)
- Reset Output
DESCRIPTION
The DS1836 MicroManager performs three vital system functions. First, a precision temperature-
compensated reference and comparator circuit monitor the status of the voltage on VCC and when an out-
of-tolerance condition is detected, an internal power-fail signal is generated that forces the reset active. If
VCC continues to degrade, it switches to the battery supply when VCC drops below 3.8V (2.6V for 3.3V
versions). When VCC exceeds 3.9V (2.8V for 3.3V versions); VOUT will again be supplied from VCC.
Reset will remain active for 350 ms after VCC returns to an in-tolerance condition.
Lastly, the DS1836 supports a sense input that sends a non-maskable interrupt whenever the sense input
drops below 1.25V.
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DS1836D pdf
OUTPUT VALID CONDITIONS
DS1836A/B/C/D
The DS1836 can maintain valid outputs as long as one input remains above 1.2V. However, the RST
outwpwuwts.DoatnaSthheeet4DUS.c1om836A (or C) use a push-pull output structure which can maintain a valid output below
1.2V on an input. To sink current below 1.2V a resistor can be connected from RST to GND (see Figure
5). This arrangement will maintain a valid value on the RST outputs even if all supply inputs are at 0V.
During conditions when the RST is in the inactive or high state this arrangement will draw current
through the pull down resistor. A value of about 100 kW should be adequate to maintain a valid condition.
The DS1836 NMI output requires a pull-up resistor on the output to maintain a valid output. The value of
the resistor is not critical in most cases but must be set low enough to pull the output to a high state. A
common value used is 10kWs (see Figure 3).
APPLICATION DIAGRAM:
RST VALID TO 0V VCC ON THE DS1836A OR DS1836C Figure 5
TIMING DIAGRAM: POWER-UP Figure 6
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