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MAX6951CEE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
General Description
The MAX6950/MAX6951 are compact common-cathode
display drivers that interface microprocessors to individ-
ual 7-segment numeric LED digits, bar graph, or discrete
LEDs through an SPI™-, QSPI™-, MICROWIRE™-com-
patible serial interface. The supply voltage can be as low
as 2.7V.
The MAX6950 drives up to five 7-segment digits or 40
discrete LEDs. The MAX6951 drives up to eight 7-seg-
ment digits or 64 discrete LEDs.
Included on-chip are hexadecimal character decoders
(0–9, A–F), multiplex scan circuitry, segment and digit
drivers, and a static RAM that stores each digit. The
user may select hexadecimal decoding or no-decode
for each digit to allow any mix of 7-segment digits, bar
graph, or discrete LEDs to be driven. The segment cur-
rent for the LEDs is set by an internal digital brightness
control. The segment drivers are slew-rate limited to
reduce EMI.
Individual digits may be addressed and updated with-
out rewriting the entire display. The devices include a
low-power shutdown mode, digital brightness control, a
scan-limit register that allows the user to display from
one to eight digits, segment blinking that can be syn-
chronized across drivers, and a test mode that forces
all LEDs on.
Applications
Set-Top Boxes
Panel Meters
White Goods
Bar Graphs and Matrix Displays
Industrial Controllers and Instrumentation
Professional Audio Equipment
Medical Equipment
Features
♦ High-speed 26MHz SPI-, QSPI-, MICROWIRE-
Compatible Serial Interface
♦ +2.7V to +5.5V Operation
♦ Individual LED Segment Control
♦ Segment Blinking Control that Can Be
Synchronized Across Multiple Drivers
♦ Hexadecimal Decode/No-Decode Digit Selection
♦ Digital Brightness Control
♦ Display Blanked on Power-Up
♦ Drives Common-Cathode LED Digits
♦ Multiplex Clock Syncronizable to External Clock
♦ Slew-Rate Limited Segment Drivers for Low EMI
♦ 75µA Low-Power Shutdown (Data Retained)
♦ Small 16-Pin QSOP Package
MAX6950/MAX6951
Serially Interfaced, +2.7V to +5.5V,
5- and 8-Digit LED Display Drivers
________________________________________________________________ Maxim Integrated Products 1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
DIN V+
(DIG6)/SEG6
DIG4/SEG4
(DIG5)/SEG5
(DIG7)/SEG7
SEG8
OSC
TOP VIEW
MAX6950
MAX6951
QSOP
CS
CLK
DIG3/SEG3
DIG0/SEG0
DIG2/SEG2
DIG1/SEG1
ISET
GND
( ) MAX6951 ONLY
Pin Configuration
19-2227; Rev 2; 3/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX6950CEE 0°C to +70°C 16 QSOP-EP*
MAX6950EEE -40°C to +85°C 16 QSOP-EP*
MAX6951CEE 0°C to +70°C 16 QSOP-EP*
MAX6951EEE -40°C to +85°C 16 QSOP-EP*
Functional Diagram appears at end of data sheet.
Typical Application appears at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
*EP = Exposed pad.
EVALUATION KIT
AVAILABLE
MAX6950/MAX6951
Serially Interfaced, +2.7V to +5.5V,
5- and 8-Digit LED Display Drivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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)
V+………………………………. ...................................-0.3V to 6V
All Other Pins................................................-0.3V to (V+ + 0.3V)
DIG1–DIG8 Sink Current.................................................. 440mA
SEG1–SEG9 Source Current.............................................. 55mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.34mW/°C above +70°C)........667mW
Operating Temperature Ranges (T
MIN
to T
MAX
)
MAX695_CEE....................................................0°C to +70°C
MAX695_EEE.................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(Typical operating circuit, V+ = +3.0V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage V+ 2.7 5.5 V
Overtemperature 75
Shutdown Supply Current I
SHDN
S hutd ow n m od e, al l d i g i tal
i np uts at V + or GN D
T
A
= +25
o
C 62 160
µA
Operating Supply Current I+
All segments on, all digits scanned,
intensity set to full, internal oscillator,
no display load connected
10 15 mA
OSC = RC oscillator 1 8
Master Clock Frequency (OSC
Internal Oscillator)
f
OSC
OSC = RC oscillator, R
SET
= 56kΩ,
C
SET
= 27pF
4
MHz
Master Clock Frequency (OSC
External Clock)
f
OSC
OSC overdriven externally 1 8 MHz
Display Scan Rate (OSC
External Clock)
f
SCAN
Eight digits scanned, OSC = overdriven
externally
155 1250 Hz
Display Scan Rate (OSC Internal
Oscillator)
f
SCAN
Eight digits scanned, OSC = RC oscillator 155 1250 Hz
Display Scan Rate (OSC Internal
Oscillator)
f
SCAN
Eight digits scanned, OSC = RC oscillator,
R
SET
= 56kΩ, C
SET
= 27pF
625 Hz
OSC Internal/External Detection
Threshold
V
OSC
1.7 V
Dead Clock Protection
Frequency
f
OSC
75.5 kHz
OSC High Time (OSC External
Clock)
t
CH
50 ns
OSC Low Time (OSC External
Clock)
t
CL
50 ns
MAX6950/MAX6951
Serially Interfaced, +2.7V to +5.5V,
5- and 8-Digit LED Display Drivers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(Typical operating circuit, V+ = +3.0V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Slow Segment Blink Period
(Internal Oscillator)
f
S LOWBLIN K
Eight digits scanned, OSC = RC oscillator,
R
SET
= 56kΩ, C
SET
= 27pF
1s
Fast Segment Blink Period
(Internal Oscillator)
f
FASTBLIN K
Eight digits scanned, OSC = RC oscillator,
R
SET
= 56kΩ, C
SET
= 27pF
0.5 s
Fast or Slow Segment Blink Duty
Cycle (Note 2)
49.9 50 50.1 %
Digit Drive Sink Current I
DIGIT
T
A
= +25°C, V
LED
= 2.4V 240 320 400 mA
Segment Drive Source Current I
SEG
T
A
= +25°C, V
LED
= 2.4V -30 -40 -50 mA
Digit Drive Sink Current (Note 2) I
DIGIT
T
A
= +25°C, V+ = 2.7V to 3V, V
LED
= 2.2V 80 mA
Segment Drive Source Current
(Note 2)
I
SEG
T
A
= +25°C, V+ = 2.7V to 3V, V
LED
= 2.2V -10 mA
Slew Rate Rise Time ∆I
SEG
/∆tT
A
= +25°C 35 mA/µs
LOGIC INPUTS
Input Current DIN, CLK, CS I
IH
, I
IL
V
IN
= 0 or V+ -2 2 µA
Logic High Input Voltage DIN,
CLK, CS
V
IH
2.4 V
Logic Low Input Voltage DIN,
CLK, CS
V
IL
0.4 V
H yster esi s V ol tag e D IN , C LK, C S ∆V
I
0.5 V
TIMING CHARACTERISTICS (Figure 1)
CLK Clock Period t
CP
38.4 ns
CLK Pulse Width High t
CH
19 ns
CLK Pulse Width Low t
CL
19 ns
C S Fall to CLK Ri se S etup Ti m et
CSS
9.5 ns
CLK Ri se to CS Rise Hold Time t
CSH
3ns
DIN Setup Time t
DS
9.5 ns
DIN Hold Time t
DH
0ns
CS Pulse High t
CSW
19 ns
TIMING CHARACTERISTICS (V+ = +2.7V) (Note 2)
CLK Clock Period t
CP
50 ns
CLK Pulse Width High t
CH
24 ns
CLK Pulse Width Low t
CL
24 ns
C S Fall to CLK Ri se Setup Time t
CSS
12 ns
CLK Ri se to CS Rise Hold Time t
CSH
4ns
DIN Setup Time t
DS
12 ns
DIN Hold Time t
DH
4ns
CS Pulse High t
CSW
24 ns
Note 1: All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MAX6951CEE+

Mfr. #:
Buy MAX6951CEE+
Manufacturer:
Maxim Integrated
Description:
LED Display Drivers 2.7-5.5V 5&8 Digit LED Display Driver
Lifecycle:
New from this manufacturer.
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