Datasheet

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General Description

The MAX7219/MAX7221 are compact, serial input/

output common-cathode display drivers that interface

microprocessors (μPs) to 7-segment numeric LED

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

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 segment 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 4-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.

For applications requiring 3V operation or segment blinking,

refer to the MAX6951 data sheet.

Applications

Features

● 10MHz Serial Interface

● Individual LED Segment Control

● Decode/No-Decode Digit Selection

● 150μA Low-Power Shutdown (Data Retained)

● Digital and Analog Brightness Control

● Display Blanked on Power-Up

● Drive Common-Cathode LED Display

● Slew-Rate Limited Segment Drivers

for Lower EMI (MAX7221)

● SPI, QSPI, MICROWIRE Serial Interface (MAX7221)

● 24-Pin DIP and SO Packages

● Bar-Graph Displays

● Industrial Controllers

● Panel Meters

● LED Matrix Displays

19-4452; Rev 6; 8/21

Ordering Information continued at end of data sheet.

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

*Dice are specified at T

= +25°C.

PART TEMP RANGE PIN-PACKAGE

MAX7219CNG 0°C to +70°C 24 Narrow Plastic DIP

MAX7219CWG 0°C to +70°C 24 Wide SO

MAX7219C/D 0°C to +70°C Dice*

MAX7219ENG -40°C to +85°C 24 Narrow Plastic DIP

MAX7219EWG -40°C to +85°C 24 Wide SO

MAX7219ERG -40°C to +85°C 24 Narrow CERDIP

Ordering Information

Pin Conguration Typical Application Circuit

DOUT

SEG D

SEG DP

SEG EGND

DIG 4

DIG 0

DIN

TOP VIEW

SEG C

V+

ISET

SEG GDIG 7

DIG 3

DIG 2

DIG 6

SEG B

SEG F

SEG A

CLK

( ) MAX7221 ONLY

LOAD (CS)

DIG 1

DIG 5

GND

DIP/SO

MAX7219

MAX7221

( ) MAX7221 ONLY

8-DIGIT µP DISPLAY

DIG 0–DIG 7

MOSI

I/O

SCK

DIN

µP

ISET

9.53kΩ

8 DIGITS

8 SEGMENTS

+5V

SEG A–G,

SEG DP

CLK

LOAD (CS)

GND

V+

GND

MAX7219

MAX7221

MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers

Click here to ask about the production status of specic part numbers.

Summary of content (15 pages)

PAGE 1
Click here to ask about the production status of specific part numbers. MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers General Description The MAX7219/MAX7221 are compact, serial input/ output common-cathode display drivers that interface microprocessors (μPs) to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs.
PAGE 2
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Absolute Maximum Ratings Voltage (with respect to GND) V+...........................................................................-0.3V to 6V DIN, CLK, LOAD, CS.............................................-0.3V to 6V All Other Pins.............................................-0.3V to (V+ + 0.3V) Current DIG 0–DIG 7 Sink Current............................................500mA SEG A–G, DP Source Current......................................
PAGE 3
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Electrical Characteristics (continued) (V+ = 5V ±10%, RSET = 9.53kΩ ±1%, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 1 µA LOGIC INPUTS Input Current DIN, CLK, LOAD, CS IIH, IIL Logic High Input Voltage VIH Logic Low Input Voltage VIL VIN = 0V or V+ -1 3.5 V 0.8 Output High Voltage VOH DOUT, ISOURCE = -1mA Output Low Voltage VOL DOUT, ISINK = 1.
PAGE 4
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Typical Operating Characteristics (V+ = +5V, TA = +25°C, unless otherwise noted.) 820 810 60 OUTPUT CURRENT (mA) 800 790 780 770 760 750 RSET = 10kΩ 50 40 RSET = 20kΩ 30 RSET = 40kΩ 20 10 740 4.0 4.4 4.8 5.2 5.6 6.
PAGE 5
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Pin Description PIN NAME FUNCTION 1 DIN 2, 3, 5–8, 10, 11 DIG 0–DIG 7 4, 9 GND Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge. Eight-digit drive lines that sink current from the display common cathode. The MAX7219 pulls the digit outputs to V+ when turned off. The MAX7221’s digit drivers are high-impedance when turned off. Ground. Both GND pins must be connected.
PAGE 6
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers CS OR LOAD tCSW tCH tCL tCSS tCSH tCP tLDCK CLK tDH tDS DIN D15 D14 D1 D0 tDO DOUT Figure 1. Timing Diagram Table 1.
PAGE 7
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Table 2.
PAGE 8
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Table 5.
PAGE 9
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Table 7.
PAGE 10
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers If the scan-limit register is set for three digits or less, individual digit drivers will dissipate excessive amounts of power. Consequently, the value of the RSET resistor must be adjusted according to the number of digits displayed, to limit individual digit driver power dissipation. Table 9 lists the number of digits displayed and the corresponding maximum recommended segment current when the digit drivers are used.
PAGE 11
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Table 11. RSET vs. Segment Current and LED Forward Voltage ISEG (mA) VLED (V) 1.5 2.0 2.5 3.0 3.5 40 12.2 11.8 11.0 10.6 9.69 30 17.8 17.1 15.8 15.0 14.0 20 29.8 28.0 25.9 24.5 22.6 10 66.7 63.7 59.3 55.4 51.
PAGE 12
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers 5 7 9 6 10 4 2 3 1N5524B 5.
PAGE 13
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers 8 DATA IN 8 LOAD DATA CLOCK 8 DIN DOUT DIN DOUT DIG 0 SEG D DIG 0 SEG D DIG 4 SEG DP DIG 4 SEG DP GND SEG E GND SEG E DIG 6 SEG C DIG 6 SEG C 5V DIG 2 V+ DIG 3 ISET DIG 7 SEG G GND SEG B DIG 5 SEG F DIG 5 SEG F DIG 1 SEG A DIG 1 SEG A LOAD (CS) ( ) MAX7221 ONLY 8 CLK 0.1µF 9.53kΩ MAX7219 MAX7221 DIG 2 V+ DIG 3 ISET DIG 7 SEG G GND SEG B LOAD (CS) CLK 5V 0.1µF 9.
PAGE 14
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Ordering Information (continued) PART TEMP RANGE Chip Topography PIN-PACKAGE MAX7221CNG 0°C to +70°C 24 Narrow Plastic DIP MAX7221CWG 0°C to +70°C 24 Wide SO MAX7221C/D 0°C to +70°C Dice* MAX7221ENG -40°C to +85°C 24 Narrow Plastic DIP MAX7221EWG -40°C to +85°C 24 Wide SO MAX7221ERG -40°C to +85°C 24 Narrow CERDIP *Dice are specified at TA = +25°C.
PAGE 15
MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 5 8/19 Updated No-Op Register section 6 8/21 Added Note to Table 11 and updated Package Information section DESCRIPTION 10 11, 14 For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.