MAX7219CNG+ Maxim, MAX7219CNG+ Datasheet - Page 5

• Manufacturer Part Number: MAX7219CNG+
• Description: Display Driver, 8-Digit LED, Serial Interface, 0 to 70 C, Narrow PDIP24
• Manufacturer: Maxim

Specifications of MAX7219CNG+

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

2, 3, 5–8,
Serially Interfaced, 8-Digit LED Display Drivers
14–17,
10, 11
20–23
PIN
4, 9
12
13
18
19
24
1
( ) MAX7221 ONLY
SEG A–SEG G,
DIG 0–DIG 7
(MAX7219)
(MAX7221)
LOAD (CS)
SEG A–SEG G, DP
SEGMENT DRIVERS
_______________________________________________________________________________________
NAME
LOAD
DOUT
GND
ISET
CLK
DIN
CS
DP
V+
CLK
DIN
REFERENCE
SEGMENT
CURRENT
(LSB)
D0
V+
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)
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 CS is 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 CS is 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.
Connect to V
R
Positive Supply Voltage. Connect to +5V.
Serial-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.
SET
R
D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12
SET
Resistor section).
DUAL-PORT
ROM WITH
BYPASS
CODE B
SRAM
8x8
DD
8
8
8
through a resistor (R
8
ADDRESS
REGISTER
DECODER
4
SET
DISPLAY-TEST REGISTER
SHUTDOWN REGISTER
SCAN-LIMIT REGISTER
INTENSITY REGISTER
) to set the peak segment current (Refer to Selecting
MODE REGISTER
FUNCTION
DIGIT DRIVERS
DIG 0–DIG 7
D13 D14 D15
(MSB)
Functional Diagram
DOUT
MODULATOR
MULTIPLEX
CIRCUITRY
INTENSITY
PULSE-
WIDTH
SCAN
Pin Description
8
5