DS1836 Datasheet, PDF (1/9 Pages) Dallas Semiconductor – 3.3V/5V MicroManager

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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 V_CC 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
V_CC
V_BAT
NC
- Power Supply Input
- Battery Supply Input
- No Connect
V_OUT
GND
- Power Supply Output
- Ground
IN
- 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 V_CC and when an out-
of-tolerance condition is detected, an internal power-fail signal is generated that forces the reset active. If
V_CC continues to degrade, it switches to the battery supply when V_CC drops below 3.8V (2.6V for 3.3V
versions). When V_CC exceeds 3.9V (2.8V for 3.3V versions); V_OUT will again be supplied from V_CC.
Reset will remain active for 350 ms after V_CC 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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