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DS1836B Schematic ( PDF Datasheet ) - Dallas Semiconductor

Teilenummer DS1836B
Beschreibung 3.3V/5V MicroManager
Hersteller Dallas Semiconductor
Logo Dallas Semiconductor Logo 




Gesamt 9 Seiten
DS1836B Datasheet, Funktion
www.DataSheet4U.com
www.maxim-ic.com
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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DS1836B Datasheet, Funktion
TIMING DIAGRAM: POWER-DOWN Figure 7
www.DataSheet4U.com
DS1836A/B/C/D
TIMING DIAGRAM: POWER SWITCH Figure 8
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