1

®

FN6154.4

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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Copyright © Intersil Americas Inc. 2006, 2007, 2008. All Rights Reserved.

All other trademarks mentioned are the property of their respective owners.

ISL28156, ISL28256

39µA Micropower Single and Dual

Precision Rail-to-Rail Input-Output (RRIO)

Low Input Bias Current Op Amps

The ISL28156 and ISL28256 are micropower precision

operational amplifiers optimized for single supply operation

at 5V and can operated down to 2.4V.

These devices feature an Input Range Enhancement Circuit

(IREC), which enables them to maintain CMRR performance

for input voltages greater than the positive supply. The input

signal is capable of swinging 0.5V above a 5.0V supply (0.25

for a 2.5V supply) and to within 10mV from ground. The

output operation is rail-to-rail.

The 1/f corner of the voltage noise spectrum is at 1kHz. This

results in low frequency noise performance, which can only

be found on devices with an order of magnitude higher than

the supply current.

ISL28156 and ISL28256 can be operated from one lithium

cell or two Ni-Cd batteries. The input range includes both

positive and negative rail. The output swings to both rails.

Features

• 39µA typical supply current

• 5nA max input bias current

• 2.4V to 5.5V single supply voltage range

• Rail-to-rail input and output

• Enable pin (ISL28156 only)

• Pb-free (RoHS compliant)

Applications

• Battery- or solar-powered systems

• 4mA to 20mA current loops

• Handheld consumer products

• Medical devices

• Sensor amplifiers

• ADC buffers

• DAC output amplifiers

Ordering Information

PART NUMBER

(Note)

PART

MARKING

PACKAGE

(Pb-free)

PKG.

DWG. #

ISL28156FHZ-T7*

GABV

6 Ld SOT-23

MDP0038

ISL28156FBZ

28156 FBZ

8 Ld SOIC

MDP0027

ISL28156FBZ-T7*

28156 FBZ

8 Ld SOIC

MDP0027

Coming Soon

ISL28256FBZ

28256 FBZ

8 Ld SOIC

MDP0027

Coming Soon

ISL28256FBZ-T7*

28256 FBZ

8 Ld SOIC

MDP0027

Coming Soon

ISL28256FUZ

8256Z

8 Ld MSOP

MDP0043

Coming Soon

ISL28256FUZ-T7*

8256Z

8 Ld MSOP

MDP0043

*Please refer to TB347 for details on reel specifications.

NOTE: These Intersil Pb-free plastic packaged products employ

special Pb-free material sets; molding compounds/die attach

materials and 100% matte tin plate PLUS ANNEAL - e3 termination

finish, which is RoHS compliant and compatible with both SnPb and

Pb-free soldering operations. Intersil Pb-free products are MSL

classified at Pb-free peak reflow temperatures that meet or exceed

the Pb-free requirements of IPC/JEDEC J STD-020.

Pinouts

ISL28156

(6 LD SOT-23)

TOP VIEW

ISL28156

(8 LD SOIC)

TOP VIEW

ISL28256

(8 LD SOIC)

TOP VIEW

ISL28256

(8 LD MSOP)

TOP VIEW

1

2

3

6

4

5

+-

OUT

V-

IN+

V+

ENABLE

IN-

1

2

3

4

8

7

6

5

-

+

NC

IN-

IN+

ENABLE

V+

OUT

V-

NC

1

2

3

4

8

7

6

5

OUT_A

IN-_A

IN+_A

V+

OUT_B

IN-_B

V-

IN+_B

+

-

+-

1

2

3

4

8

7

6

5

OUT_A

IN-_A

IN+_A

V+

OUT_B

IN-_B

V-

IN+_B

+

-

+-

Data Sheet

February 11, 2008