_______________General Description

The MAX7219/MAX7221 are compact, serial input/out-

put common-cathode display drivers that interface

microprocessors (µPs) to 7-segment numeric LED dis-

plays of up to 8 digits, bar-graph displays, or 64 indi-

vidual LEDs. Included on-chip are a BCD code-B

decoder, multiplex scan circuitry, segment and digit

drivers, and an 8x8 static RAM that stores each digit.

Only one external resistor is required to set the seg-

ment current for all LEDs. The MAX7221 is compatible

with SPI™, QSPI™, and Microwire™, and has slew-rate-

limited segment drivers to reduce EMI.

A convenient 3-wire serial interface connects to all

common µPs. Individual digits may be addressed and

updated without rewriting the entire display. The

MAX7219/MAX7221 also allow the user to select code-

B decoding or no-decode for each digit.

The devices include a 150µA low-power shutdown

mode, analog and digital brightness control, a scan-

limit register that allows the user to display from 1 to 8

digits, and a test mode that forces all LEDs on.

________________________Applications

Bar-Graph Displays

7-Segment Displays

Industrial Controllers

Panel Meters

LED Matrix Displays

____________________________Features

o 10MHz Serial Interface

o Individual LED Segment Control

o Decode/No-Decode Digit Selection

o 150µA Low-Power Shutdown (Data Retained)

o Digital and Analog Brightness Control

o Display Blanked on Power-Up

o Drive Common-Cathode LED Display

o Slew-Rate Limited Segment Drivers

for Lower EMI (MAX7221)

o SPI, QSPI, Microwire Serial Interface (MAX7221)

o 24-Pin DIP and SO Packages

Serially Interfaced, 8-Digit LED Display Drivers

________________________________________________________________

Maxim Integrated Products

1

( ) MAX7221 ONLY

8-DIGIT

µP DISPLAY

DIG 0–DIG 7

MOSI

I/O

SCK

18

1

12

13

9

4

DIN

µP

9.53k

8 DIGITS

8 SEGMENTS

+5V

19

SEG A–G,

SEG DP

CLK

LOAD (CS)

GND

V+

GND

MAX7219

MAX7221

________Typical Application Circuit

__________________Pin Configuration

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

DOUT

SEG D

SEG DP

SEG E

GND

DIG 4

DIG 0

DIN

TOP VIEW

SEG C

V+

ISET

SEG G

DIG 7

DIG 3

DIG 2

DIG 6

16

15

14

13

9

10

11

12

SEG B

SEG F

SEG A

CLK

( ) MAX7221 ONLY

LOAD (CS)

DIG 1

DIG 5

GND

DIP/SO

MAX7219

MAX7221

19-4452; Rev 3; 7/97

PART

MAX7219CNG

MAX7219CWG

MAX7219C/D

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

24 Narrow Plastic DIP

24 Wide SO

Dice*

______________Ordering Information

Ordering Information continued at end of data sheet.

MAX7219ENG

MAX7219EWG

MAX7219ERG

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

24 Narrow Plastic DIP

24 Wide SO

24 Narrow CERDIP

SPI and QSPI are trademarks of Motorola Inc. Microwire is a trademark of National Semiconductor Corp.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.