_______________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
©
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
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
________________________________________________________________
Maxim Integrated Products
1
( ) MAX7221 ONLY
8-DIGIT
μ
P DISPLAY
DIG 0–DIG 7
MOSI
I/O
SCK
18
1
12
13
9
4
DIN
μ
P
I
SET
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
MAX7219
CNG
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.
*Dice are specified at T
A
= +25°C.
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.
MAX7219/MAX7221
Serially Inter
faced, 8-Digit LED Display Drivers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 5V
±
10%, R
SET
= 9.53k
Ω
±
1%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress rating
s only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio
ns is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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
DIG0–DIG7 Sink Current
................................................
500mA
SEGA–G, DP Source Current
.........................................
100mA
Continuous Power Dissipation (T
A
= +85
°
C)
Narrow Plastic DIP
..........................................................
0.87W
Wide SO
..........................................................................
0.76W
Narrow CERDIP
.................................................................
1.1W
Operating Temperature Ranges
MAX7219C_G/MAX7221C_G
..............................
0
°
C to +70
°
C
MAX7219E_G/MAX7221E_G
............................
-40
°
C to +85
°
C
Storage Temperature Range
.............................
-65
°
C to +160
°
C
Lead Temperature (soldering, 10sec)
.............................
+300
°
C
R
SET
= open circuit
All digital inputs at V+ or GND, T
A
= +25
°
C
Digit off, V
DIGIT
= V+
T
A
= +25
°
C, V+ = 5V, V
OUT
= (V+ - 1V)
All segments and decimal point on,
I
SEG_
= -40mA
8 digits scanned
V+ = 5V, V
OUT
= 0.65V
T
A
= +25
°
C, V+ = 5V, V
OUT
= (V+ - 1V)
CONDITIONS
8
Operating Supply Current
μ
A
150
I+
V
4.0
5.5
V+
Operating Supply Voltage
Shutdown Supply Current
μ
A
-10
I
DIGIT
Digit Drive Leakage
(MAX7221 only)
%
3.0
∆
I
SEG
Segment Drive Current Matching
mA/
μ
s
10
20
50
∆
I
SEG
/
∆
t
Segment Current Slew Rate
(MAX7221 only)
mA
330
I+
Hz
500
800
1300
f
OSC
Display Scan Rate
mA
320
I
DIGIT
Digit Drive Sink Current
mA
-30
-40
-45
I
SEG
Segment Drive Source Current
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
Segment off, V
SEG
= 0V
μ
A
1
I
SEG
Segment Drive Leakage
(MAX7221 only)
Digit off, V
DIGIT
= (V+ - 0.3V)
mA
-2
I
DIGIT
Digit Drive Source Current
(MAX7219 only)
Segment off, V
SEG
= 0.3V
mA
5
I
SEG
Segment Drive Sink Current
(MAX7219 only)
MAX7219/MAX7221
Serially Inter
faced, 8-Digit LED Display Drivers
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V
±
10%, R
SET
=9.53k
Ω
±
1%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
V
IN
= 0V or V+
DOUT, I
SINK
= 1.6mA
DOUT, I
SOURCE
= -1mA
CONDITIONS
μ
A
-1
1
I
IH
, I
IL
Input Current DIN, CLK,
LOAD,
CS
V
0.4
V
OL
Output Low Voltage
V
3.5
V
IH
Logic High Input Voltage
V
0.8
V
IL
Logic Low Input Voltage
V
V+ - 1
V
OH
Output High Voltage
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
DIN, CLK, LOAD,
CS
V
1
∆
V
I
Hysteresis Voltage
ns
25
t
CSS
CS
Fall to SCLK Rise Setup Time
(MAX7221 only)
ns
100
t
CP
CLK Clock Period
ns
50
t
CH
CLK Pulse Width High
ns
50
t
CL
CLK Pulse Width Low
C
LOAD
= 50pF
ns
25
t
DS
DIN Setup Time
ns
50
t
CSW
Minimum
CS
or LOAD Pulse
High
ns
0
t
DH
DIN Hold Time
ns
25
t
DO
Output Data Propagation Delay
ns
50
t
LDCK
Load-Rising Edge to Next Clock
Rising Edge (MAX7219 only)
ns
0
t
CSH
CLK Rise to
CS
or LOAD Rise
Hold Time
ms
2.25
t
DSPD
Data-to-Segment Delay
LOGIC INPUTS
TIMING CHARACTERISTICS