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the previous application), a unity gain buffer, such as the
LM310, should be placed between pin 7 and R1, similar to
the previous application.
15 www.national.com
LM3914
Application Hints (Continued)
Non-Interacting Adjustments for Expanded Scale Meter (4.5V to 5V, Bar or Dot Mode)
DS007970-16
Other Applications
Adjusting Linearity of Several Stacked Dividers
" 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 ev-
ery 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
DS007970-17
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LM3914
Connection Diagrams
Plastic Chip Carrier Package Dual-in-Line Package
DS007970-18
Top View
DS007970-19
Order Number LM3914V
Top View
See NS Package Number V20A
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
17 www.national.com
LM3914
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
www.national.com 18
LM3914
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
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 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant support device or system whose failure to perform
into the body, or (b) support or sustain life, and can be reasonably expected to cause the failure of
whose failure to perform when properly used in the life support device or system, or to affect its
accordance with instructions for use provided in the safety or effectiveness.
labeling, can be reasonably expected to result in a
significant injury to the user.
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Corporation Europe Asia Pacific Customer Japan Ltd.
Americas Fax: +49 (0) 1 80-530 85 86 Response Group Tel: 81-3-5639-7560
Tel: 1-800-272-9959 Email: europe.support@nsc.com Tel: 65-2544466 Fax: 81-3-5639-7507
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Français Tel: +49 (0) 1 80-532 93 58
www.national.com Italiano Tel: +49 (0) 1 80-534 16 80
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.
LM3914 Dot/Bar Display Driver
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