NTE1508 NTE ELECTRONICS, NTE1508 Datasheet

Replacement Semiconductors DIP-18 DOT/BAR DRVR

NTE1508

Manufacturer Part Number

NTE1508

Description

Replacement Semiconductors DIP-18 DOT/BAR DRVR

Manufacturer

NTE ELECTRONICS

Datasheet

1.NTE1508.pdf (3 pages)

Specifications of NTE1508

Led Driver Application

Displays

No. Of Outputs

Output Current

13mA

Output Voltage

1.34V

Input Voltage

3V To 20V

Dimming Control Type

Analog

Driver Case Style

DIP

Topology

Linear

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Lead free / RoHS Compliant

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Description:

The NTE1508 is a monolithic integrated circuit in an 18–Lead DIP type package that senses analog

voltage levels and drives 10 LEDs, providing a linear analog display. A single pin changes the display

from a moving dot to a bar graph. Current drive to the LEDs is regulated and programmable, eliminating

the need for resistors. This feature is one that allows operation of the whole system from less than 3V.

The circuit contains its own adjustable reference and accurate 10–step voltage divider. The low–

bias–current input buffer accepts signals down to GND, or V–, yet needs no protection against inputs

of 35V above or below GND. The buffer drives 10 individual comparators referenced to the precision

divider. Indication non–linearity can thus be held typically to 1/2%, even over a wide temperature

range.

Versatility was designed into the NTE1508 so that controller, visual alarm, and expanded scale functions

are easily added on to the display system. The circuit can drive LEDs of many color, or low–current

incandescent lamps. Many NTE1508s can be “chained” to form displays of 20 to over 100 segments.

Both ends of the voltage divider are externally available so that 2 drivers can be made into a zero–center

meter.

The NTE1508 is very easy to apply as an analog meter circuit. A 1.2V full–scale meter requires only

1 resistor and a single 3V to 15V supply in addition to the 10 display LEDs. If the 1 resistor is a pot,

it becomes the LED brightness control

When in the dot mode, there is a small amount of overlap or “fade” (about 1mV) between segments.

This assures that at no time will all LEDs be “OFF”, and thus any ambiguous display is avoided. Vari-

ous novel displays are possible.

Much of the display flexibility derives from the fact that all outputs are individual, DC regulated cur-

rents. Various effects can be achieved by modulating these currents. The individual outputs can drive

a transistor as well as a LED at the same time, so controller functions including “staging” control can

be performed. The NTE1508 can also act as a programmer, or sequencer.

Features:

D Drives LEDs, LCDs or vacuum fluorescents

D Bar or dot display mode externally selectable

D Expandable to displays of 100 steps

D Internal voltage reference from 1.2V to 12V

D Operates with single supply of less than 3V

D Inputs operate down to GND

D Output current programmable from 2 to 30mA

by user

10–Step Dot/Bar Display Driver

Integrated Circuit

for Linear Scale

NTE1508

D No multiplex switching or interaction between

D Input withstands 35V without damage or false

D LED driver outputs are current regulated,

D Outputs can interfere with TTL or CMOS logic

D The internal 10–step divider is floating and can

outputs

open–collectors

be referenced to a wide range of voltages

Related parts for NTE1508

NTE1508 Summary of contents

Page 1

... Both ends of the voltage divider are externally available so that 2 drivers can be made into a zero–center meter. The NTE1508 is very easy to apply as an analog meter circuit. A 1.2V full–scale meter requires only 1 resistor and a single 3V to 15V supply in addition to the 10 display LEDs. If the 1 resistor is a pot, it becomes the LED brightness control When in the dot mode, there is a small amount of overlap or “ ...

Page 2

... Storage Temperature Range Lead Temperature (During soldering, 10sec) Note 1. The maximum junction temperature of the NTE1508 is +100 C. Device must be derated for operation at elevated temperatures. Junction to ambient thermal resistance is 55 C/W. Note 2. Pin5 input current must be limited to 3mA. The addition of a 39k Pin5 allows 100V signals without damage ...

Page 3

Electrical Characteristics (Cont’d): (Note 2, unless otherwise specified, all specifications apply Parameter Output Drivers (Cont’d) Dropout Voltage Saturation Voltage Output Leakage, Each Collector Output Leakage Supply Current Standby Supply Current (All Outputs OFF) Note 4. Bar mode results when Pin9 ...

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