tm

August 2012

©2004 Fairchild Semiconductor Corporation

www.fairchildsemi.com

QSE256, QSE257, QSE258, QSE259 Rev. 1.0.1

QSE256, QSE257, QSE258, QSE259

Features

Description

The QSE25x family are OPTOLOGIC® ICs which

feature a Schmitt trigger at output which provides hyster-

esis for noise immunity and pulse shaping. The basic

building block of this IC consists of a photodiode, a linear

amplifier, voltage regulator, Schmitt trigger and four out-

put options. The TTL/LSTTL compatible output can drive

up to ten TTL loads over supply currents from 4.5 to 16.0

Volts. The devices are marked with a color stripe for

easy identification.

Package Dimensions

0.25

0.51

4.38

4.62

GND

Vcc

ø

Vout

1.45

1.71

2.34

2.74

1.17

1.37

0.52

0.76

12.7

MIN

1.14

1.40

4.35

5.85

2.15

2.35

1.39

1.65

5

° TYP ON ALL SIDES

0.67

0.77

Note:

1. Dimensions for all drawings are in millimeters.

Part Number Definitions

Color Code

QSE256

Totem-Pole, buffer output

Red

QSE257

Totem-Pole, inverter output

Yellow

QSE258

Open-collector, buffer output

Green

QSE259

Open-collector, inverter output

Blue

Input/Output Table

Part Number

Light

Output

QSE256

On

HIGH

Off

LOW

QSE257

On

LOW

Off

HIGH

QSE258

On

HIGH

Off

LOW

QSE259

On

LOW

Off

HIGH