National Semiconductor LM3914 Technical data

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 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 ground, or V
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

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 seg­ments. Both ends of the voltage divider are externally avail­able 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.

1

⁄2%, even over a wide temperature range.

−

, yet needs no

February 2003

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 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 LM3914 can also act as a program­mer, 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 ac­curate operation, and avoiding oscillations.

Features

n Drives LEDs, LCDs or vacuum fluorescents
n Bar or dot display mode externally selectable by user
n Expandable to displays of 100 steps
n Internal voltage reference from 1.2V to 12V
n Operates with single supply of less than 3V
n Inputs operate down to ground
n Output current programmable from 2 mA to 30 mA
n No multiplex switching or interaction between outputs
n Input withstands
n LED driver outputs are current regulated,

open-collectors

n Outputs can interface with TTL or CMOS logic
n The internal 10-step divider is floating and can be

referenced to a wide range of voltages

±

35V without damage or false outputs

LM3914 Dot/Bar Display Driver

© 2004 National Semiconductor Corporation DS007970 www.national.com

Typical Applications

LM3914

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.

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LM3914

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)

Divider Voltage −100 mV to V

35V

+

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.

Reference Load Current 10 mA

Electrical Characteristics (Notes 2, 4)

Parameter Conditions (Note 2) Min Typ Max Units

COMPARATOR

Offset Voltage, Buffer and First
Comparator

Offset Voltage, Buffer and Any Other
Comparator

Gain (∆I

/∆VIN)I

LED

Input Bias Current (at Pin 5) 0V ≤ V

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

Line Regulation 3V ≤ V

Load Regulation 0.1 mA ≤ I

Output Voltage Change with
Temperature

Adjust Pin Current 75 120 µA

OUTPUT DRIVERS

LED Current V

LED Current Difference (Between
Largest and Smallest LED Currents)

LED Current Regulation 2V ≤ V

Dropout Voltage I

Saturation Voltage I

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

SUPPLY CURRENT

Standby Supply Current
(All Outputs Off)

0V ≤ V

RLO=VRHI

=1mA

I

LED

0V ≤ V

RLO=VRHI

=1mA

I

LED

= 2 mA, I

L(REF)

≤ V+− 1.5V 25 100 nA

IN

+

V

+

V

0˚C ≤ T

+

V

+

V

LED

LED(ON)

∆I

LED

LED

+

V
I

L(REF)

+

V
I

L(REF)

L(REF)

=V

=5V

LED
+

≤ 18V 0.01 0.03 %/V

L(REF)

=V

=5V

LED

≤ +70˚C, I

A

=5V

=V

= 5V, I

LED

=5V I

≤ 17V I

LED

= 20 mA, V

=2mA

= 2.0 mA, I

= 5V,

= 0.2 mA

= 20V,

= 1.0 mA

≤ 12V,

≤ 12V,

= 10 mA 3 8 mA/mV

LED

≤ 4 mA,

1.2 1.28 1.34 V

≤ 4 mA,

= 1 mA,

L(REF)

= 1 mA 7 10 13 mA

L(REF)

= 2 mA 0.12 0.4

LED

I

=20mA 1.2 3

LED

= 2 mA 0.1 0.25

LED

I

=20mA 1 3

LED

= 5V,

LED

= 0.4 mA 0.15 0.4 V

L(REF)

310mV

315mV

0.4 2 %

1%

1.5 V

Pin 1 60 150 450 µA

2.4 4.2 mA

6.1 9.2 mA

mA

mA

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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

LM3914

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:

3V

≤ V+≤ 20 V

DC

≤ V

3V

DC

−0.015V ≤ V

−0.015V ≤ V

For higher power dissipations, pulse testing is used.

Note 3: Accuracy is measured referred to +10.000V
significant error.

Note 4: Pin 5 input current must be limited to

Note 5: Bar mode results when pin 9 is within 20mV of V

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

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).

DCVREF,VRHI,VRLO

≤ V+0V ≤ VIN≤ V+− 1.5V

LED

RLO

RHI

≤ 12V

≤ 12 V

DCTA

DC

= +25˚C, I

≤ (V+− 1.5V)

= 0.2 mA, V

L(REF)

at pin 6, with 0.000 VDCat pin 4. At lower full-scale voltages, buffer and comparator offset voltage may add

DC

±

3mA. The addition of a 39k resistor in series with pin 5 allows±100V signals without damage.

+

. Dot mode results when pin 9 is pulled at least 200mV below V+or left open circuit. LED No. 10 (pin 10

= 3.0V, pin 9 connected to pin 3 (Bar Mode).

LED

.

LED

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

) to the change in input voltage (VIN) required to pro-

(I

LED

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

) over the specified range of load current (I

(V

REF

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

) equal to pin 4 voltage (V

RHI

RLO

).

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Typical Performance Characteristics

LM3914

Supply Current vs

Temperature

Reference Voltage vs

Temperature

00797002

Operating Input Bias

Current vs Temperature

00797020

Reference Adjust Pin

Current vs Temperature

LED Current-Regulation

Dropout

00797021

00797023

00797022

LED Driver Saturation

Voltage

00797024

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Typical Performance Characteristics (Continued)

LM3914

Input Current Beyond

Signal Range (Pin 5)

LED Driver Current

Regulation

LED Current vs

Reference Loading

00797025

00797026

Total Divider Resistance

vs Temperature

00797027

Common-Mode Limits Output Characteristics

00797029

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00797028

00797030

Block Diagram (Showing Simplest Application)

LM3914

00797003

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Functional Description

The simplifed LM3914 block diagram is to give the general

LM3914

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
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
R2 giving an output voltage of:

+

and no less than V−. If an expanded scale

then flows through the output set resistor

1

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 applica­tions.

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

+

pin).

3(V
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 simpli­fied block diagram below.

Block Diagram of Mode Pin Description

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. Ap­proximately 10 times this current will be drawn through each
lighted LED, and this current will be relatively constant de­spite 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 in­cluded in calculating LED drive current. The ability to modu­late LED brightness with time, or in proportion to input volt­age and other signals can lead to a number of novel displays
or ways of indicating input overvoltages, alarms, etc.

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*High for bar

00797005

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
open circuit) for dot mode. In most applications, pin 9 is
either open (dot mode) or tied to V

+

for bar mode and more than 200mV below V+(or

+

(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.

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 thresh­old of LED No. 11, pin 9 of LM3914 No. 1 is pulled an LED
drop (1.5V or more) below V
comparator C2, referenced 600mV below V
the output of C2 low, which shuts off output transistor Q2,
extinguishing LED No. 10.

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

V

LED

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 envi­ronment. 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.

. This condition is sensed by

LED

. This forces

LED

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 “over­lap” 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 be­tween 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 by­pass capacitor consisting of a 2.2µF solid tantalum con­nected from the pulsating LED supply to pin 2 of the LM3914
is recommended.) This ability to operate with low or fluctu­ating voltages also allows the display driver to interface with
logic circuitry, opto-coupled solid-state relays, and low­current incandescent lamps.

LM3914

Cascading LM3914s in Dot Mode

00797006

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Typical Applications

LM3914

Zero-Center Meter, 20-Segment

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00797007

Typical Applications (Continued)

Expanded Scale Meter, Dot or Bar

LM3914

*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 V
The adjustments are non-interacting.

Application Example:

Grading 5V Regulators

Highest No.

LED on

Color V

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

00797008

of 1.20V. Apply 4.94V to pin 5, and adjust R4 until LED No. 5 just lights.

D

OUT(MIN)

5V

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Typical Applications (Continued)

LM3914

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.

“Exclamation Point” Display

00797009

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

*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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00797010

Typical Applications (Continued)

LM3914

Bar Display with Alarm Flasher

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.

00797011

Adding Hysteresis (Single Supply, Bar Mode Only)

Hysteresis is 0.5 mV to 1 mV

00797012

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Typical Applications (Continued)

LM3914

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.

Operating with a High Voltage Supply (Dot Mode Only)

00797013

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Typical Applications (Continued)

20-Segment Meter with Mode Switch

LM3914

*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 prob­lem occurs when large LED currents are being drawn, espe­cially 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
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

to LED anode common can cause

LED

+

voltage at pin 3 is usually below sug-

relatively high value resistors. These high-impedance ends
should be bypassed to pin 2 with at least a 0.001µF capaci­tor, 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 7.5Ω resistor 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 ac­complished by pulling positive on the reference with a cur­rent 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 appli­cations. A special section called “Application Tips for the
LM3914 Adjustable Reference” has been included with
these schematics.

00797014

gested limits. Expanded scale meter applications may have
one or both ends of the internal voltage divider terminated at

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Application Hints (Continued)

APPLICATION TIPS FOR THE LM3914 ADJUSTABLE

LM3914

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
by use of R2. Then the voltage V
can be adjusted to 200mV, using R5 without affecting V
LED current will be approximately 10mA.

should be trimmed to 1.1V first

1

across the IC divider string

2

Greatly Expanded Scale (Bar Mode Only)

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

1

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.

.

1

Adjusting Linearity Of Several Stacked dividers

Three internal voltage dividers are shown connected in se­ries 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 adjust­ments. 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 6kΩ or higher resistance. This is possible be­cause the reference of LM3914 No. 3 is acting as a constant
current source.

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00797015

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 620Ω resistor 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.

Application Hints (Continued)

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

LM3914

Adjusting Linearity of Several Stacked Dividers

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

•

00797016

00797017

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

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Connection Diagrams

LM3914

Plastic Chip Carrier Package

Top View

Order Number LM3914V

See NS Package Number V20A

Dual-in-Line Package

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

00797018

00797019

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LM3914 MDC MWC Dot/Bar Display Driver

LM3914

Die Layout (D - Step)

00797035

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

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

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

X/Y COORDINATES PAD SIZE

XYX Y

Back Side Connection Floating

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Die/Wafer Characteristics (Continued)

LM3914

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: [phone]

IN EUROPE

Tel: [phone] / 1495

Fax: [phone]

IN ASIA PACIFIC

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IN JAPAN

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Physical Dimensions inches (millimeters)

unless otherwise noted

LM3914

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

www.national.com21

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

LM3914 Dot/Bar Display Driver

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

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.

provided in the labeling, can be reasonably expected to result
in a significant injury to the user.

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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.

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