MAX7705 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – μP Power-Supply Monitor with Reset

19-0151; Rev 0; 6/93
µP Power-Supply Monitor
with Reset
_______________General Description
In applications with microprocessors (µPs) that have a
RESET input, the MAX7705 is functionally and socket
compatible with the TL7705, but requires no external
components. It provides power-supply glitch immunity
and a guaranteed power-up reset delay, while typically
consuming 1/27^th the power from a +5V supply.
The MAX7705 monitors the power supply in µP and digital
systems. The RESET output is valid for V_CC down to 1V.
The device offers excellent circuit reliability and low cost
by eliminating external components and adjustments.
A system reset is provided during power-up, power-
down, and brownout conditions. When V_CC is below the
reset threshold, RESET is low and holds the µP in reset.
RESET will go high 280ms after V_CC rises above the
reset threshold. The MAX7705 is available in 8-pin DIP
and SO packages.
FEATURE
No. of External
Components Required
Operating Supply ^+5V
Current
+3V
Power-Supply Glitch
Immunity
Guaranteed Minimum
Reset Delay
MAX7705
0
65µA
35µA
Yes
Yes
TL7705
3
1.8mA
1.8mA
No
No
________________________Applications
Minimum Component Count, Low-Cost
Processor Systems
____________________________Features
o No External Components
o Low Cost
o Precise Reset Threshold
o 280ms Power-On Reset Delay
o 8-Pin DIP and SO Packages
______________Ordering Information
PART
TEMP. RANGE
MAX7705CPA
0°C to +70°C
MAX7705CSA
0°C to +70°C
MAX7705C/D
0°C to +70°C
MAX7705EPA
-40°C to +85°C
MAX7705ESA
-40°C to +85°C
* Contact factory for dice specifications.
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
N.C. 1
N.C. 2
N.C. 3
GND 4
MAX7705
DIP/SO
8 _VCC
7 N.C.
6 N.C.
5 RESET
*
*
MAX7705
1 N.C.
VCC ⁸
2 _N.C.
N.C. ⁷
3 _N.C.
N.C. 6
4 _GND
RESET 5
VCC
µP
*
RESET
GND
* THE MAX7705 ELIMINATES THREE EXTERNAL
COMPONENTS REQUIRED BY THE TL7705.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.