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

2

GND

Ground, connected to the

back side of the die through

lead frame.

System GND

3V

TEMP

Analog output voltage

proportional to temperature

Leave floating or connect to a high impedance

node.

4V

+

Supply input

2.7V to 5.5V with a 0.1µF bypass capacitor.

For PSRR information see Section Titled

NOISE CONSIDERATIONS.

5OS

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.

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