DS1233M Datasheet, PDF (1/4 Pages) Dallas Semiconductor – EconoReset

DS1233M
DS1233M
EconoReset
FEATURES
• Automatically restarts microprocessor after power
failure
• Maintains reset for 350 ms after V_CC returns to an
in-tolerance condition
• Reduces need for discrete components
• Precision temperature-compensated voltage refer-
ence and voltage sensor
• Low-cost TO-92 package or surface mount 8–pin
SOIC packages available
• Internal 5 KΩ pull-up resistor
• Compatible with Motorola 68XXX series and HC16
Microprocessors
• Pin function compatible with the Motorola MC33064,
MC34064, MC33164, and MC34164
• Operating temperature of –40°C to +85°C
PIN ASSIGNMENT
DALLAS
DS1233
Econo
Reset
12 3
RST
1
8
NC
V_CC
2
7
NC
NC
3
6
NC
GND
4
5
NC
DS1233M 8–PIN SOIC
(150 MIL)
See Mech. Drawings
Section
1 23
DS1233M
TO-92 Package
See Mech. Drawings
Section
PIN DESCRIPTIONS
TO–92
1 RST
2 V_CC
3 GND
– Active Low Reset Output
– Power Supply
– Ground
8–Pin SOIC
RST
V_CC
NC
GND
– Active Low Reset Output
– Power Supply
– No Connect
– Ground
DESCRIPTION
The DS1233M EconoReset uses a precision tempera-
ture compensated reference and comparator circuit to
monitor the status of the power supply (V_CC). When an
out-of-tolerance condition is detected, an internal power
fail signal is generated which forces reset to the active
(low) state. When V_CC returns to an in-tolerance condi-
tion, the reset signal is kept in the active state for ap-
proximately 350 ms to allow the power supply and pro-
cessor to stabilize.
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