LM27 National Semiconductor, LM27 Datasheet - Page 2

• Manufacturer Part Number: LM27
• Description: Factory Preset Thermostat
• Manufacturer: National Semiconductor

www.national.com
Ordering Information
Connection Diagram
Pin Descriptions
Note: pin 5 functionality and trip point setting are programmed during LM27 manufacture.
Pin Number
For more detailed information on the suffix meaning see the part number template at the end of the Electrical Charac-
teristics Section. Contact National Semiconductor for other set points and output options.
LM27CIM5-ZHJ
LM27CIM5-1HJ
LM27CIM5-2HJ
1
2
3
4
5
Bulk Rail
Order Number
Pin Name
V
HYST
GND
LM27CIM5X-ZHJ
LM27CIM5X-1HJ
LM27CIM5X-2HJ
TEMP
OS
OS
US
US
V
3000 Units in Tape
+
& Reel
Hysteresis control, digital
input
Ground, connected to the
back side of the die through
lead frame.
Analog output voltage
proportional to temperature
Supply input
Overtemperature Shutdown
open-drain active low
thermostat digital output
Overtemperature Shutdown
totem-pull active high
thermostat digital output
Undertemperature Shutdown
open-drain active low
thermostat digital output
Undertemperature Shutdown
totem-pull active high
thermostat digital output
Top Mark
Function
TZHJ
T1HJ
T2HJ
2
NS Package
Number
MA05B
MA05B
MA05B
20030702
GND for 10˚C or V
System GND
Leave floating or connect to a high impedance
node.
2.7V to 5.5V with a 0.1µF bypass capacitor.
For PSRR information see Section Titled
NOISE CONSIDERATIONS.
Controller interrupt, system or power supply
shutdown; pull-up resistor ≥ 10kΩ
Controller interrupt, system or power supply
shutdown
System or power supply shutdown; pull-up
resistor ≥ 10kΩ
System or power supply shutdown
Trip Point Setting
120˚C
130˚C
140˚C
Connection
+
for 2˚C
Output Function
Open Drain OS
Open Drain OS
Open Drain OS