2024年5月22日发(作者：卫旭尧)
19-4452; Rev 3; 7/97
Serially Interfaced, 8-Digit LED Display Drivers
_______________General Description____________________________Features
The MAX7219/MAX7221 are compact, serial input/out-
put common-cathode display drivers that interface
o10MHz Serial Interface
microprocessors (µPs) to 7-segment numeric LED dis-
oIndividual LED Segment Control
plays of up to 8 digits, bar-graph displays, or 64 indi-
vidual LEDs. Included on-chip are a BCD code-B
oDecode/No-Decode Digit Selection
decoder, multiplex scan circuitry, segment and digit
o150µA Low-Power Shutdown (Data Retained)
drivers, and an 8x8 static RAM that stores each digit.
Only one external resistor is required to set the seg-
oDigital and Analog Brightness Control
ment current for all LEDs. The MAX7221 is compatible
oDisplay Blanked on Power-Up
with SPI™, QSPI™, and Microwire™, and has slew-rate-
limited segment drivers to reduce EMI.
oDrive Common-Cathode LED Display
A convenient 3-wire serial interface connects to all
oSlew-Rate Limited Segment Drivers
common µPs. Individual digits may be addressed and
for Lower EMI (MAX7221)
updated without rewriting the entire display. The
MAX7219/MAX7221 also allow the user to select code-
oSPI, QSPI, Microwire Serial Interface (MAX7221)
B decoding or no-decode for each digit.
o24-Pin DIP and SO Packages
The devices include a 150µA low-power shutdown
mode, analog and digital brightness control, a scan-
______________Ordering Information
limit register that allows the user to display from 1 to 8
PART
TEMP. RANGEPIN-PACKAGE
digits, and a test mode that forces all LEDs on.
MAX7219CNG
0°C to +70°C24 Narrow Plastic DIP
________________________Applications
MAX7219CWG0°C to +70°C24 Wide SO
Bar-Graph Displays
MAX7219C/D0°C to +70°CDice*
7-Segment Displays
MAX7219ENG-40°C to +85°C24 Narrow Plastic DIP
Industrial Controllers
MAX7219EWG-40°C to +85°C24 Wide SO
MAX7219ERG-40°C to +85°C24 Narrow CERDIP
Panel Meters
Ordering Information continued at end of data sheet.
LED Matrix Displays
*Dice are specified at T
A
= +25°C.
__________________Pin Configuration________Typical Application Circuit
TOP VIEW
DIN124DOUT
DIG 0223SEG D
DIG 4322SEG DP
+5V
GND421SEG E
19
DIG 6
5
MAX7219
9.53k
V+
MAX7221
20
SEG C
18
DIG 2
619
V+
I
SET
DIG 0–DIG 7
8 DIGITS
DIG 3
718
ISET
MOSI
1
DIN
MAX7219
DIG 7
817
SEG G
MAX7221
µP
I/O
12
GND
916SEG B
LOAD (CS)
13
DIG 5
1015SEG F
SCK
CLK
SEG A–G,
9
SEG DP
DIG 1
1114SEG A
GND
8 SEGMENTS
GND
LOAD (CS)
1213
CLK
4
( ) MAX7221 ONLY
DIP/SO
( ) MAX7221 ONLY
8-DIGIT µP DISPLAY
SPI and QSPI are trademarks of Motorola Inc. Microwire is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: , or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
M
A
X
7
2
1
9
/
M
A
X
7
2
2
1
ABSOLUTE MAXIMUM RATINGS
Voltage (with respect to GND)
V+............................................................................-0.3V to 6V
DIN, CLK, LOAD,
CS...............................................-0.3V to 6V
All -0.3V to (V+ + 0.3V)
Current
DIG0–DIG7 500mA
SEGA–G, DP 100mA
Continuous Power Dissipation (T
A
= +85°C)
Narrow .0.87W
0.76W
.1.1W
Operating Temperature Ranges
MAX7219C_G/.0°C to +70°C
MAX7219E_G/-40°C to +85°C
Storage -65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 5V ±10%, R
SET
= 9.53kΩ±1%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
Operating Supply Voltage
Shutdown Supply Current
Operating Supply Current
Display Scan Rate
Digit Drive Sink Current
Segment Drive Source Current
Segment Current Slew Rate
(MAX7221 only)
Segment Drive Current Matching
Digit Drive Leakage
(MAX7221 only)
Segment Drive Leakage
(MAX7221 only)
Digit Drive Source Current
(MAX7219 only)
Segment Drive Sink Current
(MAX7219 only)
SYMBOL
V+
I+
I+
f
OSC
I
DIGIT
I
SEG
∆I
SEG
/∆t
∆I
SEG
I
DIGIT
I
SEG
I
DIGIT
I
SEG
Digit off, V
DIGIT
= V+
Segment off, V
SEG
= 0V
Digit off, V
DIGIT
= (V+ - 0.3V)
Segment off, V
SEG
= 0.3V
-2
5
All digital inputs at V+ or GND, T
A
= +25°C
R
SET
= open circuit
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)
T
A
= +25°C, V+ = 5V, V
OUT
= (V+ - 1V)
500
320
-30
10
-40
20
3.0
-10
1
-45
50
330
8001300
CONDITIONSMIN
4.0
TYPMAX
5.5
150
8
mA
Hz
mA
mA
mA/µs
%
µA
µA
mA
mA
UNITS
V
µA
2_______________________________________________________________________________________
2024年5月22日发(作者：卫旭尧)
19-4452; Rev 3; 7/97
Serially Interfaced, 8-Digit LED Display Drivers
_______________General Description____________________________Features
The MAX7219/MAX7221 are compact, serial input/out-
put common-cathode display drivers that interface
o10MHz Serial Interface
microprocessors (µPs) to 7-segment numeric LED dis-
oIndividual LED Segment Control
plays of up to 8 digits, bar-graph displays, or 64 indi-
vidual LEDs. Included on-chip are a BCD code-B
oDecode/No-Decode Digit Selection
decoder, multiplex scan circuitry, segment and digit
o150µA Low-Power Shutdown (Data Retained)
drivers, and an 8x8 static RAM that stores each digit.
Only one external resistor is required to set the seg-
oDigital and Analog Brightness Control
ment current for all LEDs. The MAX7221 is compatible
oDisplay Blanked on Power-Up
with SPI™, QSPI™, and Microwire™, and has slew-rate-
limited segment drivers to reduce EMI.
oDrive Common-Cathode LED Display
A convenient 3-wire serial interface connects to all
oSlew-Rate Limited Segment Drivers
common µPs. Individual digits may be addressed and
for Lower EMI (MAX7221)
updated without rewriting the entire display. The
MAX7219/MAX7221 also allow the user to select code-
oSPI, QSPI, Microwire Serial Interface (MAX7221)
B decoding or no-decode for each digit.
o24-Pin DIP and SO Packages
The devices include a 150µA low-power shutdown
mode, analog and digital brightness control, a scan-
______________Ordering Information
limit register that allows the user to display from 1 to 8
PART
TEMP. RANGEPIN-PACKAGE
digits, and a test mode that forces all LEDs on.
MAX7219CNG
0°C to +70°C24 Narrow Plastic DIP
________________________Applications
MAX7219CWG0°C to +70°C24 Wide SO
Bar-Graph Displays
MAX7219C/D0°C to +70°CDice*
7-Segment Displays
MAX7219ENG-40°C to +85°C24 Narrow Plastic DIP
Industrial Controllers
MAX7219EWG-40°C to +85°C24 Wide SO
MAX7219ERG-40°C to +85°C24 Narrow CERDIP
Panel Meters
Ordering Information continued at end of data sheet.
LED Matrix Displays
*Dice are specified at T
A
= +25°C.
__________________Pin Configuration________Typical Application Circuit
TOP VIEW
DIN124DOUT
DIG 0223SEG D
DIG 4322SEG DP
+5V
GND421SEG E
19
DIG 6
5
MAX7219
9.53k
V+
MAX7221
20
SEG C
18
DIG 2
619
V+
I
SET
DIG 0–DIG 7
8 DIGITS
DIG 3
718
ISET
MOSI
1
DIN
MAX7219
DIG 7
817
SEG G
MAX7221
µP
I/O
12
GND
916SEG B
LOAD (CS)
13
DIG 5
1015SEG F
SCK
CLK
SEG A–G,
9
SEG DP
DIG 1
1114SEG A
GND
8 SEGMENTS
GND
LOAD (CS)
1213
CLK
4
( ) MAX7221 ONLY
DIP/SO
( ) MAX7221 ONLY
8-DIGIT µP DISPLAY
SPI and QSPI are trademarks of Motorola Inc. Microwire is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: , or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
M
A
X
7
2
1
9
/
M
A
X
7
2
2
1
ABSOLUTE MAXIMUM RATINGS
Voltage (with respect to GND)
V+............................................................................-0.3V to 6V
DIN, CLK, LOAD,
CS...............................................-0.3V to 6V
All -0.3V to (V+ + 0.3V)
Current
DIG0–DIG7 500mA
SEGA–G, DP 100mA
Continuous Power Dissipation (T
A
= +85°C)
Narrow .0.87W
0.76W
.1.1W
Operating Temperature Ranges
MAX7219C_G/.0°C to +70°C
MAX7219E_G/-40°C to +85°C
Storage -65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 5V ±10%, R
SET
= 9.53kΩ±1%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
Operating Supply Voltage
Shutdown Supply Current
Operating Supply Current
Display Scan Rate
Digit Drive Sink Current
Segment Drive Source Current
Segment Current Slew Rate
(MAX7221 only)
Segment Drive Current Matching
Digit Drive Leakage
(MAX7221 only)
Segment Drive Leakage
(MAX7221 only)
Digit Drive Source Current
(MAX7219 only)
Segment Drive Sink Current
(MAX7219 only)
SYMBOL
V+
I+
I+
f
OSC
I
DIGIT
I
SEG
∆I
SEG
/∆t
∆I
SEG
I
DIGIT
I
SEG
I
DIGIT
I
SEG
Digit off, V
DIGIT
= V+
Segment off, V
SEG
= 0V
Digit off, V
DIGIT
= (V+ - 0.3V)
Segment off, V
SEG
= 0.3V
-2
5
All digital inputs at V+ or GND, T
A
= +25°C
R
SET
= open circuit
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)
T
A
= +25°C, V+ = 5V, V
OUT
= (V+ - 1V)
500
320
-30
10
-40
20
3.0
-10
1
-45
50
330
8001300
CONDITIONSMIN
4.0
TYPMAX
5.5
150
8
mA
Hz
mA
mA
mA/µs
%
µA
µA
mA
mA
UNITS
V
µA
2_______________________________________________________________________________________