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MAX7219CNG+MAXIMN/a3000avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7219CWG+ |MAX7219CWGMAXN/a15avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7219CWG+T |MAX7219CWGTMAXIMN/a6000avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7219ENG+ |MAX7219ENGMAXN/a1avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7219EWG+MAXIMN/a8000avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7219EWG+T |MAX7219EWGTMAXIMN/a10887avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7221CNG+ |MAX7221CNGMAXIMN/a5000avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7221CWG+ |MAX7221CWGMAXN/a30avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7221CWG+T |MAX7221CWGTMAXIN/a2500avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7221ENG+MAXIMN/a6300avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7221EWG+N/AN/a4000avaiSerially Interfaced, 8-Digit, LED Display Drivers
MAX7221EWG+TMAXIMN/a7000avaiSerially Interfaced, 8-Digit, LED Display Drivers


MAX7219EWG+T ,Serially Interfaced, 8-Digit, LED Display DriversELECTRICAL CHARACTERISTICS(V+ = 5V ±10%, R = 9.53kΩ ±1%, T = T to T , unless otherwise noted.)SET A ..
MAX721CSE ,PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORSFeatures . Low 0.9V to 5.5V Battery Operating Range . Unregulated 7V to 20V DC Input Range . ..
MAX721ESE ,PALMTOP COMPUTER AND FLASH MEMORY POWER SUPPLY REGULATORSELECTRICAL CHARACTERISTICS (Circuit of Figure 1, VBATT1 = VBATT2 = 2.5V, TA = TMIN to ,TMAi. unl ..
MAX722 ,PALMTOP COMPUTER AND LCD POWER SUPPLY REGULATORSapplications that reqUIre a MAX722ESE -40°C to +85''C 16 Narrow SO +12Voutputvoltage, refertothe M ..
MAX7221CNG ,Serially Interfaced / 8-Digit LED Display DriversELECTRICAL CHARACTERISTICS(V+ = 5V ±10%, R = 9.53kΩ ±1%, T = T to T , unless otherwise noted.)SET A ..
MAX7221CNG+ ,Serially Interfaced, 8-Digit, LED Display DriversELECTRICAL CHARACTERISTICS(V+ = 5V ±10%, R = 9.53kΩ ±1%, T = T to T , unless otherwise noted.)SET A ..
MB47358 ,DUAL OPERATIONAL AMPLIFIERFUJITSU SEMICONDUCTORDS04-11104-3EDATA SHEETLINEAR ICDUAL OPERATIONAL AMPLIFIERMB47358DUAL OPERATIO ..
MB47393 ,DUAL COMPARATORFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB47393P ,Dual comparatorFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB47393P ,Dual comparatorFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB47393PF ,Dual comparatorFUJITSU SEMICONDUCTORDS04-12103-4EDATA SHEETASSPDUAL COMPARATORMB47393n DESCRIPTIONThe Fujitsu MB47 ..
MB4752A ,SUBSCRIBER LINE INTERFACE IC" mm; gr T$544-A874 'j?itl,'l,lllill,ililill MB4752A April 1987 'llllllllllllllllllllllllill ..


MAX7219CNG+-MAX7219CWG+-MAX7219CWG+T-MAX7219ENG+-MAX7219EWG+-MAX7219EWG+T-MAX7221CNG+-MAX7221CWG+-MAX7221CWG+T-MAX7221ENG+-MAX7221EWG+-MAX7221EWG+T
Serially Interfaced, 8-Digit, LED Display Drivers
AVAILABLE
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 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 InterfaceIndividual LED Segment ControlDecode/No-Decode Digit Selection150µA Low-Power Shutdown (Data Retained)Digital and Analog Brightness ControlDisplay Blanked on Power-UpDrive Common-Cathode LED DisplaySlew-Rate Limited Segment Drivers
for Lower EMI (MAX7221)
SPI, QSPI, MICROWIRE Serial Interface (MAX7221)24-Pin DIP and SO Packages
Serially Interfaced, 8-Digit LED Display Drivers

( ) MAX7221 ONLY8-DIGIT μP DISPLAY
DIG 0–DIG 7
MOSI
I/O
SCK
DIN
ISET
9.53kΩ
8 DIGITS
8 SEGMENTS
+5V
SEG A–G,
SEG DPCLK
LOAD (CS)
GND
GND
MAX7219
MAX7221ypical Application CircuitPin Configuration
DOUT
SEG D
SEG DP
SEG EGND
DIG 4
DIG 0
DIN
TOP VIEW
SEG C
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
PART
MAX7219CNG

MAX7219CWG
MAX7219C/D0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP RANGEPIN-PACKAGE

24 Narrow Plastic DIP
24 Wide SO
Dice*
Ordering Information
Ordering Information continued at end of data sheet.

*Dice are specified at TA = +25°C.
MAX7219ENG
MAX7219EWG
MAX7219ERG-40°C to +85°C
-40°C to +85°C
-40°C to +85°C24 Narrow Plastic DIP
24 Wide SO
24 Narrow CERDIP
Bar-Graph Displays
Industrial Controllers
Panel Meters
LED Matrix Displays
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(V+ = 5V ±10%, RSET = 9.53kΩ±1%, TA= TMINto TMAX, unless otherwise noted.)
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.
Voltage (with respect to GND)............................................................................-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........................................100mA
Continuous Power Dissipation (TA= +85°C)
Narrow Plastic DIP (derate 13.3mW/°C
above +70°C)..............................................................1066mW
Wide SO (derate 11.8mW/°C above +70°C).................941mW
Narrow CERDIP (derate 12.5mW/°C above +70°C)...1000mW
Operating Temperature Ranges (TMINto TMAX)
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, 10s).................................+300°C
RSET= open circuit
All digital inputs at V+ or GND, TA= +25°C
Digit off, VDIGIT= V+= +25°C, V+ = 5V, VOUT= (V+ - 1V)
All segments and decimal point on,
ISEG_= -40mA
8 digits scanned
V+ = 5V, VOUT= 0.65V= +25°C, V+ = 5V, VOUT= (V+ - 1V)
CONDITIONS

Operating Supply Current150I+4.05.5V+Operating Supply Voltage
Shutdown Supply Current-10IDIGITDigit Drive Leakage
(MAX7221 only)3.0ΔISEGSegment Drive Current Matching
mA/µs102050ΔISEG/ΔtSegment Current Slew Rate
(MAX7221 only)330I+5008001300fOSCDisplay Scan Rate320IDIGITDigit Drive Sink Current-30-40-45ISEGSegment Drive Source Current
UNITSMINTYPMAXSYMBOLPARAMETER

Segment off, VSEG= 0VµA1ISEGSegment Drive Leakage
(MAX7221 only)
Digit off, VDIGIT= (V+ - 0.3V)mA-2IDIGITDigit Drive Source Current
(MAX7219 only)
Segment off, VSEG= 0.3VmA5ISEGSegment Drive Sink Current
(MAX7219 only)
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
ELECTRICAL CHARACTERISTICS (continued)

(V+ = 5V ±10%, RSET = 9.53kΩ±1%, TA= TMINto TMAX, unless otherwise noted.)
VIN= 0V or V+
DOUT, ISINK= 1.6mA
DOUT, ISOURCE= -1mA
CONDITIONS
-11IIH, IILInput Current DIN, CLK,
LOAD, CS0.4VOLOutput Low Voltage3.5VIHLogic High Input Voltage0.8VILLogic Low Input VoltageV+ - 1VOHOutput High Voltage
UNITSMINTYPMAXSYMBOLPARAMETER

DIN, CLK, LOAD, CSV1ΔVIHysteresis Voltage25tCSSCSFall to SCLK Rise Setup Time
(MAX7221 only)100tCPCLK Clock Period50tCHCLK Pulse Width High50tCLCLK Pulse Width Low
CLOAD= 50pF25tDSDIN Setup Time50tCSWMinimum CSor LOAD Pulse
High0tDHDIN Hold Time25tDOOutput Data Propagation Delay50tLDCKLoad-Rising Edge to Next Clock
Rising Edge (MAX7219 only)0tCSHCLK Rise to CSor LOAD Rise
Hold Time2.25tDSPDData-to-Segment Delay
LOGIC INPUTS
TIMING CHARACTERISTICS

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

(V+ = +5V, TA = +25°C, unless otherwise noted.)
SCAN FREQUENCY vs.
POSITIVE SUPPLY VOLTAGE
MAX7219/21 01
POSITIVE SUPPLY VOLTAGE (V)
SCAN FREQUENCY (Hz)
SEGMENT DRIVER OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX7219/21 02
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
RSET = 10kΩ
RSET = 20kΩ
RSET = 40kΩ
MAX7219
SEGMENT OUTPUT CURRENT

MAX7219/21 03
5μs/div
10mA/div
MAXIMUM INTENSITY = 31/32
MAX7221
SEGMENT OUTPUT CURRENT

MAX7219/21 04
5μs/div
10mA/div
MAXIMUM INTENSITY = 15/16
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
Pin Description
Functional Diagram
NAMEFUNCTION
DINSerial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge.
2, 3, 5–8,
10, 11DIG 0–DIG 7
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.
PIN

4, 9GNDGround (both GND pins must be connected)
LOAD
(MAX7219)ISETConnect to VDDthrough a resistor (RSET) to set the peak segment current (Refer to Selecting
RSETResistor and Using External Drivers section).
14–17,
SEG A–SEG G,CLK
(MAX7221)DOUTSerial-Data Output. The data into DIN is valid at DOUT 16.5 clock cycles later. This pin is used
to daisy-chain several MAX7219/MAX7221’s and is never high-impedance.V+Positive Supply Voltage. Connect to +5V.
( ) MAX7221 ONLY
RSET
LOAD (CS)
DINDOUT
CLK(MSB)(LSB)
SEG A–SEG G, DPDIG 0–DIG 7
SHUTDOWN REGISTER
MODE REGISTER
INTENSITY REGISTER
SCAN-LIMIT REGISTER
DISPLAY-TEST REGISTER
INTENSITY
PULSE-
WIDTH
MODULATOR
MULTIPLEX
SCAN
CIRCUITRYADDRESS
REGISTER
DECODER
8x8
DUAL-PORT
SRAMD2D3D4D5D6D7D8D9D10D11D12
DIGIT DRIVERS
D13D14D15
CODE B
ROM WITH
BYPASS
SEGMENT
CURRENT
REFERENCE
SEGMENT DRIVERS
Load-Data Input. The last 16 bits of serial data are latched on LOAD’s rising edge.
Chip-Select Input. Serial data is loaded into the shift register while CSis low. The last 16 bits of
serial data are latched on CS’s rising edge.
Serial-Clock Input. 10MHz maximum rate. On CLK’s rising edge, data is shifted into the inter-
nal shift register. On CLK’s falling edge, data is clocked out of DOUT. On the MAX7221, the
CLK input is active only while CSis low.
Seven Segment Drives and Decimal Point Drive that source current to the display. On the
MAX7219, when a segment driver is turned off it is pulled to GND. The MAX7221 segment dri-
vers are high-impedance when turned off.
MAX7219/MAX7221
MSB
Serially Interfaced, 8-Digit LED Display Drivers
Detailed Description
MAX7219/MAX7221 Differences

The MAX7219 and MAX7221 are identical except for
two parameters: the MAX7221 segment drivers are
slew-rate limited to reduce electromagnetic interfer-
ence (EMI), and its serial interface is fully SPI compati-
ble.
Serial-Addressing Modes

For the MAX7219, serial data at DIN, sent in 16-bit
packets, is shifted into the internal 16-bit shift register
with each rising edge of CLK regardless of the state of
LOAD. For the MAX7221, CSmust be low to clock data
in or out. The data is then latched into either the digit or
control registers on the rising edge of LOAD/CS.
LOAD/CSmust go high concurrently with or after the
16th rising clock edge, but before the next rising clock
edge or data will be lost. Data at DIN is propagated
through the shift register and appears at DOUT 16.5
clock cycles later. Data is clocked out on the falling
edge of CLK. Data bits are labeled D0–D15 (Table 1).
D8–D11 contain the register address. D0–D7 contain
the data, and D12–D15 are “don’t care” bits. The first
received is D15, the most significant bit (MSB).
Digit and Control Registers

Table 2 lists the 14 addressable digit and control regis-
ters. The digit registers are realized with an on-chip,
8x8 dual-port SRAM. They are addressed directly so
that individual digits can be updated and retain data as
long as V+ typically exceeds 2V. The control registers
consist of decode mode, display intensity, scan limit
(number of scanned digits), shutdown, and display test
(all LEDs on).
Shutdown Mode

When the MAX7219 is in shutdown mode, the scan oscil-
lator is halted, all segment current sources are pulled to
ground, and all digit drivers are pulled to V+, thereby
blanking the display. The MAX7221 is identical, except
the drivers are high-impedance. Data in the digit and
control registers remains unaltered. Shutdown can be
used to save power or as an alarm to flash the display by
successively entering and leaving shutdown mode. For
minimum supply current in shutdown mode, logic inputs
should be at ground or V+ (CMOS-logic levels).
Typically, it takes less than 250µs for the MAX7219/
MAX7221 to leave shutdown mode. The display driver
can be programmed while in shutdown mode, and
shutdown mode can be overridden by the display-test
CLK
DIND15
DOUT
D14D1D0
tCSStCLtCHtCP
tDO
tLDCK
tCSW
tCSH
tDS
tDH
OR LOAD
Figure 1. Timing Diagram
Table 1. Serial-Data Format (16 Bits)

D14D15
D12D13X
D10D11D8D9
ADDRESSD7D4D5D3D0D1
MSBDATALSB
MAX7219/MAX7221
Initial Power-Up
On initial power-up, all control registers are reset, the
display is blanked, and the MAX7219/MAX7221 enter
shutdown mode. Program the display driver prior to
display use. Otherwise, it will initially be set to scan one
digit, it will not decode data in the data registers, and
the intensity register will be set to its minimum value.
Decode-Mode Register

The decode-mode register sets BCD code B (0-9, E, H,
L, P, and -) or no-decode operation for each digit. Each
bit in the register corresponds to one digit. A logic high
selects code B decoding while logic low bypasses the
decoder. Examples of the decode mode control-regis-
ter format are shown in Table 4.
When the code B decode mode is used, the decoder
looks only at the lower nibble of the data in the digit
registers (D3–D0), disregarding bits D4–D6. D7, which
sets the decimal point (SEG DP), is independent of the
decoder and is positive logic (D7 = 1 turns the decimal
point on). Table 5 lists the code B font.
When no-decode is selected, data bits D7–D0 corre-
spond to the segment lines of the MAX7219/MAX7221.
Table 6 shows the one-to-one pairing of each data bit
to the appropriate segment line.
Serially Interfaced, 8-Digit LED Display Drivers
Table 2. Register Address Map
Table 3. Shutdown Register Format (Address (Hex) = 0xXC)
Table 4. Decode-Mode Register Examples (Address (Hex) = 0xX9)

No-OpX00
ADDRESS

0xX0
0xX1
Digit 1X00
0xX2
0xX30Digit 2X
Digit 3X01
Digit 0X
0xX4
0xX5
Digit 5X01
0xX6
0xX70Digit 6X
Digit 4X
Digit 7X10
0xX8
0xX91Decode
ModeX
IntensityX10
0xXA
0xXB
ShutdownX11
0xXC
0xXF1Display
TestX
Scan LimitX
D15–
D12D11D10REGISTERD9D8
HEX
CODE
Shutdown
Mode0xXCXXXXXXXX
REGISTER DATA
MODE

Normal
Operation0xXCNo decode for digits 7–00DECODE MODE0x000D5D3Code B decode for digits 7–0
Code B decode for digit 0
No decode for digits 7–10
HEX
CODE

REGISTER DATA

0xFFD000
0x01Code B decode for digits 3–0
No decode for digits 7–411110x0F
ADDRESS CODE
(HEX)D6D4D7D5D2D0D3D1

MAX7219/MAX7221
Intensity Control
and Interdigit Blanking

The MAX7219/MAX7221 allow display brightness to be
controlled with an external resistor (RSET) connected
between V+ and ISET. The peak current sourced from
the segment drivers is nominally 100 times the current
entering ISET. This resistor can either be fixed or vari-
able to allow brightness adjustment from the front
panel. Its minimum value should be 9.53kΩ, which typi-
cally sets the segment current at 40mA. Display bright-
ness can also be controlled digitally by using the
intensity register.
Digital control of display brightness is provided by an
internal pulse-width modulator, which is controlled by
the lower nibble of the intensity register. The modulator
scales the average segment current in 16 steps from a
maximum of 31/32 down to 1/32 of the peak current set
by RSET(15/16 to 1/16 on MAX7221). Table 7 lists the
intensity register format. The minimum interdigit blank-
ing time is set to 1/32 of a cycle.
Serially Interfaced, 8-Digit LED Display Drivers
Table 5. Code B Font
Table 6. No-Decode Mode Data Bits and
Corresponding Segment Lines
0X000111111
D7*
REGISTER DATA

7-SEGMENT
CHARACTERD3D6–D4D1D2DP*D0BADCFEG
0X00110
ON SEGMENTS = 1
10000X10011100110X10111110010X01010011010X01101111010X11001111110X11111010001X00011111111X00111111011X10000000011X10101101111X01010011111X01100101101X1101100111
blank1X1110000000
*The decimal point is set by bit D7 = 1
STANDARD 7-SEGMENT LED

DP Corresponding
Segment LineCG
REGISTER DATA
D3D7
MAX7219/MAX7221
Scan-Limit Register
The scan-limit register sets how many digits are dis-
played, from 1 to 8. They are displayed in a multiplexed
manner with a typical display scan rate of 800Hz with 8
digits displayed. If fewer digits are displayed, the scan
rate is 8fOSC/N, where N is the number of digits
scanned. Since the number of scanned digits affects
the display brightness, the scan-limit register should
not be used to blank portions of the display (such as
leading zero suppression). Table 8 lists the scan-limit
register format.
Table 7. Intensity Register Format (Address (Hex) = 0xXA)
DUTY CYCLE
MAX7221MAX7219D6D7D4D2D3D0D5D1HEX
CODE

1/16
(min on)
1/32
(min on)XXXX00000xX0
2/163/32XXXX00100xX1
3/165/32XXXX00010xX2
4/167/32XXXX00110xX3
5/169/32XXXX10000xX4
6/1611/32XXXX10100xX5
7/1613/32XXXX10010xX68/1615/32XXX0110xX7
9/1617/32XXX1000xX8
10/1619/32XXX1100xX9
11/1621/32XXX1010xXA
12/1623/32XXX1110xXB
13/1625/32XXX1000xXC
14/1627/32XXX1100xXD
15/1629/32XXX1010xXE
15/16
(max on)31/32XXX11110xXF
Table 8. Scan-Limit Register Format (Address (Hex) = 0xXB)
Display digit 0 only*
Display digits 0 & 1*XSCAN LIMIT
0xX10xX00D51D3Display digits 0 1 2*
Display digits 0 1 2 3X
0xX3
HEX
CODE

0xX2
REGISTER DATA
D011010Display digits 0 1 2 3 4
Display digits 0 1 2 3 4 5X0xX50xX4101Display digits 0 1 2 3 4 5 6
Display digits 0 1 2 3 4 5 6 7X
0xX70xX60111110
*See Scan-Limit Registersection for application.
Serially Interfaced, 8-Digit LED Display Drivers

MAX7219/MAX7221
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