19-1280; Rev 2; 11/99
Low-Cost, +2.7V to +5.5V, Micropower
Temperature Switches in SOT23 and TO-220
________________General Description
The MAX6501–MAX6504 low-cost, fully integrated tem-
perature switches assert a logic signal when their die
temperature crosses a factory-programmed threshold.
Operating from a +2.7V to +5.5V supply, these devices
feature two on-chip, temperature-dependent voltage
references and a comparator. They are available with
factory-trimmed temperature trip thresholds from -45°C
to +115°C in 10°C increments, and are accurate to
±0.5°C (typ) or ±6°C (max). These devices require no
external components and typically consume 30µA sup-
ply current. Hysteresis is pin-selectable at +2°C or
+10°C.
The MAX6501/MAX6503 have an active-low, open-drain
output intended to interface with a microprocessor (µP)
reset input. The MAX6502/MAX6504 have an active-
high, push-pull output intended to directly drive fan-
control logic. The MAX6501/MAX6502 are offered with
hot-temperature thresholds (+35°C to +115°C), assert-
ing when the temperature is above the threshold. The
MAX6503/MAX6504 are offered with cold-temperature
thresholds (-45°C to +15°C), asserting when the tem-
perature is below the threshold.
The MAX6501–MAX6504 are offered in eight standard
temperature versions; contact the factory for pricing
and availability of nonstandard temperature versions.
They are available in 5-pin SOT23 and 7-pin TO-220
packages.
____________________________Features
o
±0.5°C (typical) Threshold Accuracy Over
Full Temperature Range
o
No External Components Required
o
Low Cost
o
30µA Supply Current
o
Factory-Programmed Thresholds from
-45°C to +115°C in 10°C Increments
o
Open-Drain Output (MAX6501/MAX6503)
Push-Pull Output (MAX6502/MAX6504)
o
Pin-Selectable +2°C or +10°C Hysteresis
o
SOT23-5 and TO220-7 Packages
MAX6501–MAX6504
†
Ordering Information
PART*
MAX6501UK_
_ _ _-T
MAX6501CM_ _ _ _-T
MAX6502UK_
_ _ _-T
MAX6502CM_ _ _ _-T
MAX6503UK_
_ _ _-T
MAX6503CM_ _ _ _-T
MAX6504UK_
_ _ _-T
MAX6504CM_ _ _ _-T
TEMP. RANGE
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
5 SOT23-5
7 TO-220-7
5 SOT23-5
7 TO-220-7
5 SOT23-5
7 TO-220-7
5 SOT23-5
7 TO-220-7
Typical Operating Circuit
+2.7V TO +5.5V
V
CC
MAX6502
TOVER
GND
GND
HYST
V
CC
µP
*These
parts are offered in eight standard temperature versions
with a minimum order of 2,500 pieces. To complete the suffix
information, add P or N for positive or negative trip temperature,
and select an available trip point in degrees centigrade. For
example, the MAX6501UKP065-T describes a MAX6501 in a
SOT23-5 package with a +65°C threshold. Contact the factory for
pricing and availability of nonstandard temperature versions (mini-
mum order 10,000 pieces).
INT
GND
________________________Applications
µP Temperature Monitoring in High-Speed
Computers
Temperature Control
Selector Guide and Pin Configurations appear at end of
data sheet.
Temperature Alarms
Fan Control
†
Patents
Pending
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
