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LM3914

LM3914 Dot/Bar Display Driver

Literature Number: SNVS761A

LM3914

Dot/Bar Display Driver

General Description

The LM3914 is a monolithic integrated circuit 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 resis-

tors. This feature is one that allows operation of the whole

system from less than 3V.

The circuit contains its own adjustable reference and accu-

rate 10-step voltage divider. The low-bias-current input

buffer accepts signals down to ground, or V

−

, yet needs no

protection against inputs of 35V above or below ground. The

buffer drives 10 individual comparators referenced to the

precision divider. Indication non-linearity can thus be held

typically to

⁄

%, even over a wide temperature range.

Versatility was designed into the LM3914 so that controller,

visual alarm, and expanded scale functions are easily added

on to the display system. The circuit can drive LEDs of many

colors, or low-current incandescent lamps. Many LM3914s

can be “chained” to form displays of 20 to over 100 seg-

ments. Both ends of the voltage divider are externally avail-

able so that 2 drivers can be made into a zero-center meter.

The LM3914 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. The

simplified block diagram illustrates this extremely simple

external circuitry.

When in the dot mode, there is a small amount of overlap or

“fade” (about 1 mV) between segments. This assures that at

no time will all LEDs be “OFF”, and thus any ambiguous

display is avoided. Various novel displays are possible.

Much of the display flexibility derives from the fact that all

outputs are individual, DC regulated currents. Various effects

can be achieved by modulating these currents. The indi-

vidual outputs can drive a transistor as well as a LED at the

same time, so controller functions including “staging” control

can be performed. The LM3914 can also act as a program-

mer, or sequencer.

The LM3914 is rated for operation from 0˚C to +70˚C. The

LM3914N-1 is available in an 18-lead molded (N) package.

The following typical application illustrates adjusting of the

reference to a desired value, and proper grounding for ac-

curate operation, and avoiding oscillations.

Features

nDrives LEDs, LCDs or vacuum fluorescents

nBar or dot display mode externally selectable by user

nExpandable to displays of 100 steps

nInternal voltage reference from 1.2V to 12V

nOperates with single supply of less than 3V

nInputs operate down to ground

nOutput current programmable from 2 mA to 30 mA

nNo multiplex switching or interaction between outputs

nInput withstands ±35V without damage or false outputs

nLED driver outputs are current regulated,

open-collectors

nOutputs can interface with TTL or CMOS logic

nThe internal 10-step divider is floating and can be

referenced to a wide range of voltages

February 2003

LM3914 Dot/Bar Display Driver

Typical Applications

0V to 5V Bar Graph Meter

00797001

Note: Grounding method is typical of all uses. The 2.2µF tantalum or 10 µF aluminum electrolytic capacitor is needed if leads to the LED supply are 6" or

longer.

LM3914

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Power Dissipation (Note 6)

Molded DIP (N) 1365 mW

Supply Voltage 25V

Voltage on Output Drivers 25V

Input Signal Overvoltage (Note 4) ±35V

Divider Voltage −100 mV to V

Reference Load Current 10 mA

Storage Temperature Range −55˚C to +150˚C

Soldering Information

Dual-In-Line Package

Soldering (10 seconds) 260˚C

Plastic Chip Carrier Package

Vapor Phase (60 seconds) 215˚C

Infrared (15 seconds) 220˚C

See AN-450 “Surface Mounting Methods and Their Effect

on Product Reliability” for other methods of soldering

surface mount devices.

Electrical Characteristics (Notes 2, 4)

Parameter Conditions (Note 2) Min Typ Max Units

COMPARATOR

Offset Voltage, Buffer and First

Comparator

0V ≤V

RLO

RHI

≤12V,

LED

=1mA 310mV

Offset Voltage, Buffer and Any Other

Comparator

0V ≤V

RLO

RHI

≤12V,

LED

=1mA 315mV

Gain (∆I

LED

/∆V

L(REF)

= 2 mA, I

LED

= 10 mA 3 8 mA/mV

Input Bias Current (at Pin 5) 0V ≤V

≤V

− 1.5V 25 100 nA

Input Signal Overvoltage No Change in Display −35 35 V

VOLTAGE-DIVIDER

Divider Resistance Total, Pin 6 to 4 8 12 17 kΩ

Accuracy (Note 3) 0.5 2 %

VOLTAGE REFERENCE

Output Voltage 0.1 mA ≤I

L(REF)

≤4 mA,

LED

=5V 1.2 1.28 1.34 V

Line Regulation 3V ≤V

≤18V 0.01 0.03 %/V

Load Regulation 0.1 mA ≤I

L(REF)

≤4 mA,

LED

=5V 0.4 2 %

Output Voltage Change with

Temperature

0˚C ≤T

≤+70˚C, I

L(REF)

= 1 mA,

=5V 1%

Adjust Pin Current 75 120 µA

OUTPUT DRIVERS

LED Current V

LED

= 5V, I

L(REF)

= 1 mA 7 10 13 mA

LED Current Difference (Between

Largest and Smallest LED Currents)

LED

=5V I

LED

= 2 mA 0.12 0.4 mA

LED

=20mA 1.2 3

LED Current Regulation 2V ≤V

LED

≤17V I

LED

= 2 mA 0.1 0.25 mA

LED

=20mA 1 3

Dropout Voltage I

LED(ON)

= 20 mA, V

LED

= 5V,

∆I

LED

=2mA 1.5 V

Saturation Voltage I

LED

= 2.0 mA, I

L(REF)

= 0.4 mA 0.15 0.4 V

Output Leakage, Each Collector (Bar Mode) (Note 5) 0.1 10 µA

Output Leakage (Dot Mode) (Note 5) Pins 10–18 0.1 10 µA

Pin 1 60 150 450 µA

SUPPLY CURRENT

Standby Supply Current

(All Outputs Off)

= 5V,

L(REF)

= 0.2 mA 2.4 4.2 mA

= 20V,

L(REF)

= 1.0 mA 6.1 9.2 mA

LM3914

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Electrical Characteristics (Notes 2, 4) (Continued)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which

guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit

is given, however, the typical value is a good indication of device performance.

Note 2: Unless otherwise stated, all specifications apply with the following conditions:

DC ≤V+≤20 VDC VREF,V

RHI,V

RLO ≤(V+− 1.5V)

DC ≤VLED ≤V+0V ≤VIN ≤V+− 1.5V

−0.015V ≤VRLO ≤12VDC TA= +25˚C, IL(REF) = 0.2 mA, VLED = 3.0V, pin 9 connected to pin 3 (Bar Mode).

−0.015V ≤VRHI ≤12 VDC

For higher power dissipations, pulse testing is used.

Note 3: Accuracy is measured referred to +10.000VDC at pin 6, with 0.000 VDC at pin 4. At lower full-scale voltages, buffer and comparator offset voltage may add

significant error.

Note 4: Pin 5 input current must be limited to ±3mA. The addition of a 39k resistor in series with pin 5 allows ±100V signals without damage.

Note 5: Bar mode results when pin 9 is within 20mV of V+. Dot mode results when pin 9 is pulled at least 200mV below V+or left open circuit. LED No. 10 (pin 10

output current) is disabled if pin 9 is pulled 0.9V or more below VLED.

Note 6: The maximum junction temperature of the LM3914 is 100˚C. Devices must be derated for operation at elevated temperatures. Junction to ambient thermal

resistance is 55˚C/W for the molded DIP (N package).

Definition of Terms

Accuracy: The difference between the observed threshold

voltage and the ideal threshold voltage for each comparator.

Specified and tested with 10V across the internal voltage

divider so that resistor ratio matching error predominates

over comparator offset voltage.

Adjust Pin Current: Current flowing out of the reference

adjust pin when the reference amplifier is in the linear region.

Comparator Gain: The ratio of the change in output current

LED

) to the change in input voltage (V

) required to pro-

duce it for a comparator in the linear region.

Dropout Voltage: The voltage measured at the current

source outputs required to make the output current fall by

10%.

Input Bias Current: Current flowing out of the signal input

when the input buffer is in the linear region.

LED Current Regulation: The change in output current

over the specified range of LED supply voltage (V

LED

)as

measured at the current source outputs. As the forward

voltage of an LED does not change significantly with a small

change in forward current, this is equivalent to changing the

voltage at the LED anodes by the same amount.

Line Regulation: The average change in reference output

voltage over the specified range of supply voltage (V

Load Regulation: The change in reference output voltage

REF

) over the specified range of load current (I

L(REF)

Offset Voltage: The differential input voltage which must be

applied to each comparator to bias the output in the linear

region. Most significant error when the voltage across the

internal voltage divider is small. Specified and tested with pin

6 voltage (V

RHI

) equal to pin 4 voltage (V

RLO

LM3914

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Typical Performance Characteristics

Supply Current vs

Temperature

Operating Input Bias

Current vs Temperature

00797002 00797020

Reference Voltage vs

Temperature

Reference Adjust Pin

Current vs Temperature

00797021 00797022

LED Current-Regulation

Dropout

LED Driver Saturation

Voltage

00797023

00797024

LM3914

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Typical Performance Characteristics (Continued)

Input Current Beyond

Signal Range (Pin 5)

LED Current vs

Reference Loading

00797025

00797026

LED Driver Current

Regulation

Total Divider Resistance

vs Temperature

00797027

00797028

Common-Mode Limits Output Characteristics

00797029

00797030

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Block Diagram (Showing Simplest Application)

00797003

LM3914

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Functional Description

The simplifed LM3914 block diagram is to give the general

idea of the circuit’s operation. A high input impedance buffer

operates with signals from ground to 12V, and is protected

against reverse and overvoltage signals. The signal is then

applied to a series of 10 comparators; each of which is

biased to a different comparison level by the resistor string.

In the example illustrated, the resistor string is connected to

the internal 1.25V reference voltage. In this case, for each

125mV that the input signal increases, a comparator will

switch on another indicating LED. This resistor divider can

be connected between any 2 voltages, providing that they

are 1.5V below V

and no less than V

−

. If an expanded scale

meter display is desired, the total divider voltage can be as

little as 200mV. Expanded-scale meter displays are more

accurate and the segments light uniformly only if bar mode is

used. At 50mV or more per step, dot mode is usable.

INTERNAL VOLTAGE REFERENCE

The reference is designed to be adjustable and develops a

nominal 1.25V between the REF OUT (pin 7) and REF ADJ

(pin 8) terminals. The reference voltage is impressed across

program resistor R1 and, since the voltage is constant, a

constant current I

then flows through the output set resistor

R2 giving an output voltage of:

00797004

Since the 120µA current (max) from the adjust terminal

represents an error term, the reference was designed to

minimize changes of this current with V

and load changes.

CURRENT PROGRAMMING

A feature not completely illustrated by the block diagram is

the LED brightness control. The current drawn out of the

reference voltage pin (pin 7) determines LED current. Ap-

proximately 10 times this current will be drawn through each

lighted LED, and this current will be relatively constant de-

spite supply voltage and temperature changes. Current

drawn by the internal 10-resistor divider, as well as by the

external current and voltage-setting divider should be in-

cluded in calculating LED drive current. The ability to modu-

late LED brightness with time, or in proportion to input volt-

age and other signals can lead to a number of novel displays

or ways of indicating input overvoltages, alarms, etc.

MODE PIN USE

Pin 9, the Mode Select input controls chaining of multiple

LM3914s, and controls bar or dot mode operation. The

following tabulation shows the basic ways of using this input.

Other more complex uses will be illustrated in the applica-

tions.

Bar Graph Display: Wire Mode Select (pin 9) directly to pin

3(V

pin).

Dot Display, Single LM3914 Driver: Leave the Mode Select

pin open circuit.

Dot Display, 20 or More LEDs: Connect pin 9 of the first

driver in the series (i.e., the one with the lowest input voltage

comparison points) to pin 1 of the next higher LM3914 driver.

Continue connecting pin 9 of lower input drivers to pin 1 of

higher input drivers for 30, 40, or more LED displays. The

last LM3914 driver in the chain will have pin 9 wired to pin 11.

All previous drivers should have a 20k resistor in parallel with

LED No. 9 (pin 11 to V

LED

Mode Pin Functional Description

This pin actually performs two functions. Refer to the simpli-

fied block diagram below.

Block Diagram of Mode Pin Description

00797005

*High for bar

DOT OR BAR MODE SELECTION

The voltage at pin 9 is sensed by comparator C1, nominally

referenced to (V

− 100mV). The chip is in bar mode when

pin 9 is above this level; otherwise it’s in dot mode. The

comparator is designed so that pin 9 can be left open circuit

for dot mode.

Taking into account comparator gain and variation in the

100mV reference level, pin 9 should be no more than 20mV

below V

for bar mode and more than 200mV below V

(or

open circuit) for dot mode. In most applications, pin 9 is

either open (dot mode) or tied to V

(bar mode). In bar mode,

pin 9 should be connected directly to pin 3. Large currents

drawn from the power supply (LED current, for example)

should not share this path so that large IR drops are avoided.

LM3914

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Mode Pin Functional Description

(Continued)

DOT MODE CARRY

In order for the display to make sense when multiple

LM3914s are cascaded in dot mode, special circuitry has

been included to shut off LED No. 10 of the first device when

LED No. 1 of the second device comes on. The connection

for cascading in dot mode has already been described and is

depicted below.

As long as the input signal voltage is below the threshold of

the second LM3914, LED No. 11 is off. Pin 9 of LM3914

No. 1 thus sees effectively an open circuit so the chip is in

dot mode. As soon as the input voltage reaches the thresh-

old of LED No. 11, pin 9 of LM3914 No. 1 is pulled an LED

drop (1.5V or more) below V

LED

. This condition is sensed by

comparator C2, referenced 600mV below V

LED

. This forces

the output of C2 low, which shuts off output transistor Q2,

extinguishing LED No. 10.

LED

is sensed via the 20k resistor connected to pin 11. The

very small current (less than 100µA) that is diverted from

LED No. 9 does not noticeably affect its intensity.

An auxiliary current source at pin 1 keeps at least 100µA

flowing through LED No. 11 even if the input voltage rises

high enough to extinguish the LED. This ensures that pin 9 of

LM3914 No. 1 is held low enough to force LED No. 10 off

when any higher LED is illuminated. While 100µA does not

normally produce significant LED illumination, it may be

noticeable when using high-efficiency LEDs in a dark envi-

ronment. If this is bothersome, the simple cure is to shunt

LED No. 11 with a 10k resistor. The 1V IR drop is more than

the 900mV worst case required to hold off LED No. 10 yet

small enough that LED No. 11 does not conduct significantly.

OTHER DEVICE CHARACTERISTICS

The LM3914 is relatively low-powered itself, and since any

number of LEDs can be powered from about 3V, it is a very

efficient display driver. Typical standby supply current (all

LEDs OFF) is 1.6mA (2.5mA max). However, any reference

loading adds 4 times that current drain to the V

(pin 3)

supply input. For example, an LM3914 with a 1mA reference

pin load (1.3k), would supply almost 10mA to every LED

while drawing only 10mA from its V

pin supply. At full-scale,

the IC is typically drawing less than 10% of the current

supplied to the display.

The display driver does not have built-in hysteresis so that

the display does not jump instantly from one LED to the next.

Under rapidly changing signal conditions, this cuts down

high frequency noise and often an annoying flicker. An “over-

lap” is built in so that at no time between segments are all

LEDs completely OFF in the dot mode. Generally 1 LED

fades in while the other fades out over a mV or more of

range (Note 3). The change may be much more rapid be-

tween LED No. 10 of one device and LED No. 1 of a second

device “chained” to the first.

The LM3914 features individually current regulated LED

driver transistors. Further internal circuitry detects when any

driver transistor goes into saturation, and prevents other

circuitry from drawing excess current. This results in the

ability of the LM3914 to drive and regulate LEDs powered

from a pulsating DC power source, i.e., largely unfiltered.

(Due to possible oscillations at low voltages a nominal by-

pass capacitor consisting of a 2.2µF solid tantalum con-

nected from the pulsating LED supply to pin 2 of the LM3914

is recommended.) This ability to operate with low or fluctu-

ating voltages also allows the display driver to interface with

logic circuitry, opto-coupled solid-state relays, and low-

current incandescent lamps.

Cascading LM3914s in Dot Mode

00797006

LM3914

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Typical Applications

Zero-Center Meter, 20-Segment

00797007

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Typical Applications (Continued)

Expanded Scale Meter, Dot or Bar

00797008

*This application illustrates that the LED supply needs practically no filtering

Calibration: With a precision meter between pins 4 and 6 adjust R1 for voltage VDof 1.20V. Apply 4.94V to pin 5, and adjust R4 until LED No. 5 just lights.

The adjustments are non-interacting.

Application Example:

Grading 5V Regulators

Highest No.

LED on Color V

OUT(MIN)

10 Red 5.54

9 Red 5.42

8 Yellow 5.30

7 Green 5.18

6 Green 5.06

5 Green 4.94

4 Green 4.82

3 Yellow 4.7

2 Red 4.58

1 Red 4.46

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Typical Applications (Continued)

“Exclamation Point” Display

00797009

LEDs light up as illustrated with the upper lit LED indicating the actual input voltage. The display appears to increase resolution and provides an analog

indication of overrange.

Indicator and Alarm, Full-Scale Changes Display from Dot to Bar

00797010

*The input to the Dot-Bar Switch may be taken from cathodes of other LEDs. Display will change to bar as soon as the LED so selected begins to light.

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Typical Applications (Continued)

Bar Display with Alarm Flasher

00797011

Full-scale causes the full bar display to flash. If the junction of R1 and C1 is connected to a different LED cathode, the display will flash when that LED lights,

and at any higher input signal.

Adding Hysteresis (Single Supply, Bar Mode Only)

00797012

Hysteresis is 0.5 mV to 1 mV

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Typical Applications (Continued)

Operating with a High Voltage Supply (Dot Mode Only)

00797013

The LED currents are approximately 10mA, and the LM3914 outputs operate in saturation for minimum dissipation.

*This point is partially regulated and decreases in voltage with temperature. Voltage requirements of the LM3914 also decrease with temperature.

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Typical Applications (Continued)

20-Segment Meter with Mode Switch

00797014

*The exact wiring arrangement of this schematic shows the need for Mode Select (pin 9) to sense the V+voltage exactly as it appears on pin 3.

Programs LEDs to 10mA

Application Hints

Three of the most commonly needed precautions for using

the LM3914 are shown in the first typical application drawing

showing a 0V–5V bar graph meter. The most difficult prob-

lem occurs when large LED currents are being drawn, espe-

cially in bar graph mode. These currents flowing out of the

ground pin cause voltage drops in external wiring, and thus

errors and oscillations. Bringing the return wires from signal

sources, reference ground and bottom of the resistor string

(as illustrated) to a single point very near pin 2 is the best

solution.

Long wires from V

LED

to LED anode common can cause

oscillations. Depending on the severity of the problem

0.05µF to 2.2µF decoupling capacitors from LED anode

common to pin 2 will damp the circuit. If LED anode line

wiring is inaccessible, often similar decoupling from pin 1 to

pin 2 will be sufficient.

If LED turn ON seems slow (bar mode) or several LEDs light

(dot mode), oscillation or excessive noise is usually the

problem. In cases where proper wiring and bypassing fail to

stop oscillations, V

voltage at pin 3 is usually below sug-

gested limits. Expanded scale meter applications may have

one or both ends of the internal voltage divider terminated at

relatively high value resistors. These high-impedance ends

should be bypassed to pin 2 with at least a 0.001µF capaci-

tor, or up to 0.1µF in noisy environments.

Power dissipation, especially in bar mode should be given

consideration. For example, with a 5V supply and all LEDs

programmed to 20mA the driver will dissipate over 600mW.

In this case a 7.5Ωresistor in series with the LED supply will

cut device heating in half. The negative end of the resistor

should be bypassed with a 2.2µF solid tantalum capacitor to

pin 2 of the LM3914.

Turning OFF of most of the internal current sources is ac-

complished by pulling positive on the reference with a cur-

rent source or resistance supplying 100µA or so. Alternately,

the input signal can be gated OFF with a transistor switch.

Other special features and applications characteristics will

be illustrated in the following applications schematics. Notes

have been added in many cases, attempting to cover any

special procedures or unusual characteristics of these appli-

cations. A special section called “Application Tips for the

LM3914 Adjustable Reference” has been included with

these schematics.

LM3914

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Application Hints (Continued)

APPLICATION TIPS FOR THE LM3914 ADJUSTABLE

REFERENCE

Greatly Expanded Scale (Bar Mode Only)

Placing the LM3914 internal resistor divider in parallel with a

section (.230Ω) of a stable, low resistance divider greatly

reduces voltage changes due to IC resistor value changes

with temperature. Voltage V

should be trimmed to 1.1V first

by use of R2. Then the voltage V

across the IC divider string

can be adjusted to 200mV, using R5 without affecting V

LED current will be approximately 10mA.

Non-Interacting Adjustments For Expanded Scale

Meter (4.5V to 5V, Bar or Dot Mode)

This arrangement allows independent adjustment of LED

brightness regardless of meter span and zero adjustments.

First, V

is adjusted to 5V, using R2. Then the span (voltage

across R4) can be adjusted to exactly 0.5V using R6 without

affecting the previous adjustment.

R9 programs LED currents within a range of 2.2mA to 20mA

after the above settings are made.

Greatly Expanded Scale (Bar Mode Only)

00797015

Adjusting Linearity Of Several Stacked

dividers

Three internal voltage dividers are shown connected in se-

ries to provide a 30-step display. If the resulting analog meter

is to be accurate and linear the voltage on each divider must

be adjusted, preferably without affecting any other adjust-

ments. To do this, adjust R2 first, so that the voltage across

R5 is exactly 1V. Then the voltages across R3 and R4 can

be independently adjusted by shunting each with selected

resistors of 6kΩor higher resistance. This is possible be-

cause the reference of LM3914 No. 3 is acting as a constant

current source.

The references associated with LM3914s No. 1 and No. 2

should have their Ref Adj pins (pin 8) wired to ground, and

their Ref Outputs loaded by a 620Ωresistor to ground. This

makes available similar 20mA current outputs to all the LEDs

in the system.

If an independent LED brightness control is desired (as in

the previous application), a unity gain buffer, such as the

LM310, should be placed between pin 7 and R1, similar to

the previous application.

LM3914

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Application Hints (Continued)

Non-Interacting Adjustments for Expanded Scale Meter (4.5V to 5V, Bar or Dot Mode)

00797016

Adjusting Linearity of Several Stacked Dividers

00797017

Other Applications

•“Slow” — fade bar or dot display (doubles resolution)

•20-step meter with single pot brightness control

•10-step (or multiples) programmer

•Multi-step or “staging” controller

•Combined controller and process deviation meter

•Direction and rate indicator (to add to DVMs)

•Exclamation point display for power saving

•Graduations can be added to dot displays. Dimly light

every other LED using a resistor to ground

•Electronic “meter-relay” — display could be circle or semi-

circle

•Moving “hole” display — indicator LED is dark, rest of bar

lit

•Drives vacuum-fluorescent and LCDs using added pas-

sive parts

LM3914

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Connection Diagrams

Plastic Chip Carrier Package

00797018

Top View

Order Number LM3914V

See NS Package Number V20A

Dual-in-Line Package

00797019

Top View

Order Number LM3914N-1

See NS Package Number NA18A

Order Number LM3914N *

See NS Package Number N18A

* Discontinued, Life Time Buy date 12/20/99

LM3914

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LM3914 MDC MWC Dot/Bar Display Driver

00797035

Die Layout (D - Step)

Die/Wafer Characteristics

Fabrication Attributes General Die Information

Physical Die Identification 3914 Bond Pad Opening Size (min) 94µm x 105µm

Die Step D Bond Pad Metalization ALUMINUM

Physical Attributes Passivation VOM NITRIDE

Wafer Diameter 150mm Back Side Metal Bare Back

Dise Size (Drawn) 2591µm x 2438µm

102.0mils x

96.0mils

Back Side Connection Floating

Thickness 330µm Nominal

Min Pitch 175µm Nominal

Special Assembly Requirements:

Note: Actual die size is rounded to the nearest micron.

Die Bond Pad Coordinate Locations (D - Step)

(Referenced to die center, coordinates in µm) NC = No Connection, N.U. = Not Used

SIGNAL NAME PAD# NUMBER X/Y COORDINATES PAD SIZE

XYX Y

LED NO.1 1 -1086 732 105 x 105

V- 2 -1086 343 105 x 105

V- 3 -1040 171 105 x 105

V+ 4 -1052 -206 105 x 105

DIV LOW END 5 -1086 -377 105 x 105

SIG INPUT 6 -903 -1154 101 x 105

DIV HIGH END 7 -745 -1160 105 x 94

REF OUTPUT 8 224 -1126 105 x 94

REF ADJ 9 1086 -1154 105 x 105

MODE SEL 10 1057 -475 94 x 105

LED NO.10 11 1057 869 94 x 128

LED NO.9 12 1086 1052 105 x 105

LED NO.8 13 846 1160 105 x 94

NC 14 537 1154 105 x 105

LED NO.7 15 343 1154 105 x 105

NC 16 171 1154 82 x 105

LED NO.6 17 0 1154 105 x 105

LM3914

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Die/Wafer Characteristics (Continued)

LED NO.5 18 -320 1154 105 x 105

LED NO.4 19 -526 1154 105 x 105

LED NO.3 20 -1086 1086 105 x 105

LED NO.2 21 -1086 903 105 x 105

IN U.S.A

Tel #: 1 877 Dial Die 1 877 342 5343

Fax: 1 207 541 6140

IN EUROPE

Tel: 49 (0) 8141 351492 / 1495

Fax: 49 (0) 8141 351470

IN ASIA PACIFIC

Tel: (852) 27371701

IN JAPAN

Tel: 81 043 299 2308

LM3914

www.national.com 20

Physical Dimensions inches (millimeters)

unless otherwise noted

Note: Unless otherwise specified.

1. Standard Lead Finish:

200 microinches /5.08 micrometer minimum

lead/tin 37/63 or 15/85 on alloy 42 or equivalent or copper

2. Reference JEDEC registration MS-001, Variation AC, dated May 1993.

Dual-In-Line Package (N)

Order Number LM3914N-1

NS Package Number NA18A

Plastic Chip Carrier Package (V)

Order Number LM3914V

NS Package Number V20A

LM3914

www.national.com21

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

Dual-In-Line Package (N)

Order Number LM3914N *

NS Package Number N18A

* Discontinued, Life Time Buy date 12/20/99

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves

the right at any time without notice to change said circuitry and specifications.

For the most current product information visit us at www.national.com.

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS

WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body, or

(b) support or sustain life, and whose failure to perform when

properly used in accordance with instructions for use

provided in the labeling, can be reasonably expected to result

in a significant injury to the user.

2. A critical component is any component of a life support

device or system whose failure to perform can be reasonably

expected to cause the failure of the life support device or

system, or to affect its safety or effectiveness.

BANNED SUBSTANCE COMPLIANCE

National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship

Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned

Substances’’ as defined in CSP-9-111S2.

National Semiconductor

Americas Customer

Support Center

Email: new.feedback@nsc.com

Tel: 1-800-272-9959

National Semiconductor

Europe Customer Support Center

Fax: +49 (0) 180-530 85 86

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 69 9508 6208

English Tel: +44 (0) 870 24 0 2171

Français Tel: +33 (0) 1 41 91 8790

National Semiconductor

Asia Pacific Customer

Support Center

Email: ap.support@nsc.com

National Semiconductor

Japan Customer Support Center

Fax: 81-3-5639-7507

Email: jpn.feedback@nsc.com

Tel: 81-3-5639-7560

www.national.com

LM3914 Dot/Bar Display Driver

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