Rainbow Electronics LM27 - Manual (Page 2)

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