MAX6968AUE+ Maxim Integrated Products, MAX6968AUE+ Datasheet

IC LED DRIVER LINEAR 16-TSSOP

MAX6968AUE+

Manufacturer Part Number
MAX6968AUE+
Description
IC LED DRIVER LINEAR 16-TSSOP
Manufacturer
Maxim Integrated Products
Type
Linear (Serial Interface)r
Datasheet

Specifications of MAX6968AUE+

Constant Current
Yes
Topology
8-Bit Shift Register, Open Drain, PWM
Number Of Outputs
8
Internal Driver
Yes
Type - Primary
General Purpose
Voltage - Supply
3 V ~ 5.5 V
Voltage - Output
5.5V
Mounting Type
Surface Mount
Package / Case
16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
55mA
Internal Switch(s)
No
Number Of Segments
16
Low Level Output Current
60 mA
Operating Supply Voltage
3 V to 5.5 V
Maximum Supply Current
25 mA
Maximum Power Dissipation
1702 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency
-
Efficiency
-
Lead Free Status / Rohs Status
 Details
The MAX6968 serial-interfaced LED driver provides
eight open-drain, constant-current sinking LED driver
outputs rated at 5.5V. The MAX6968 operates from a 3V
to 5.5V supply. The MAX6968 supply and the LEDs’
supply or supplies may power up in any order. The
constant-current outputs are programmed together to
up to 55mA using a single external resistor. The
MAX6968 operates with a 25Mb, industry-standard, 4-
wire serial interface.
The MAX6968 uses the industry-standard shift-register-
plus-latch-type serial interface. The driver accepts data
shifted into an 8-bit shift register using data input DIN
and clock input CLK. Input data appears at the output
DOUT eight clock cycles later to allow cascading of
multiple MAX6968s. The latch-enable input LE loads
the 8 bits of shift register data into an 8-bit output latch
to set which LEDs are on and which are off. The output-
enable input OE gates all eight outputs on and off, and
is fast enough to be used as a PWM input for LED
intensity control.
For applications requiring LED fault detection, refer to
the MAX6977 data sheet that automatically detects
open-circuit LEDs.
For safety-related applications requiring a watchdog
timer, refer to the MAX6978 data sheet that includes a
fail-safe feature that blanks the display if the serial inter-
face becomes inactive for more than 1s.
The MAX6968 is one of a family of 12 shift-register-plus-
latch-type LED drivers. The family includes 8-port and
16-port types, with 5.5V- or 36V-rated LED outputs, with
and without open-circuit LED detection and watchdog.
All versions operate from a 3V to 5.5V supply, and are
specified over the -40°C to +125°C temperature range.
19-3555; Rev 2; 7/05
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.
Variable Message Signs
Marquee Displays
Point-of-Order Signs
Traffic Signs
Gaming Features
Architectural Lighting
8-Port, 5.5V Constant-Current LED Driver
________________________________________________________________ Maxim Integrated Products
General Description
Applications
o 25Mb Industry-Standard 4-Wire Serial Interface at 5V
o 3V to 5.5V Logic Supply
o 8 Constant-Current LED Outputs Rated at 5.5V
o Up to 55mA Continuous Current per Output
o Output Current Programmed by Single Resistor
o 3% Current Matching Between Outputs
o 6% Current Matching Between ICs
o -40°C to +125°C Temperature Range
*EP = Exposed pad.
Typical Application Circuit and Selector Guide appear at
end of data sheet.
MAX6968AUE
MAX6968APE
MAX6968AAE
PART
TOP VIEW
OUT0
OUT1
OUT2
OUT3
GND
CLK
DIN
LE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
1
2
6
3
4
5
7
8
TSSOP/PDIP/SSOP
TEMP RANGE
Ordering Information
MAX6968AUE
MAX6968APE
MAX6968AAE
Pin Configuration
16
15
14
13
12
11
10
9
PIN-PACKAGE
16 TSSOP-EP*
16 PDIP
16 SSOP
V+
SET
DOUT
OE
OUT7
OUT6
OUT5
OUT4
Features
1

Related parts for MAX6968AUE+

MAX6968AUE+ Summary of contents

Page 1

... Marquee Displays Point-of-Order Signs Traffic Signs Gaming Features Architectural Lighting ________________________________________________________________ Maxim Integrated Products 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. o 25Mb Industry-Standard 4-Wire Serial Interface 5.5V Logic Supply o 8 Constant-Current LED Outputs Rated at 5.5V ...

Page 2

Constant-Current LED Driver ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) V+ ............................................................................-0.3V to +6V OUT_ .......................................................................-0.3V to +6V DIN, CLK, LE, OE, SET ................................-0.3V to (V+ + 0.3V) DOUT Current ..................................................................±10mA OUT_ Sink Current .............................................................60mA Total GND ...

Page 3

Constant-Current LED Driver 5V TIMING CHARACTERISTICS (Typical Operating Circuit 4.5V to 5.5V, T PARAMETER SYMBOL CLK Clock Period CLK Pulse-Width High CLK Pulse-Width Low DIN Setup Time DIN Hold Time DOUT Propagation Delay DOUT Rise and ...

Page 4

Constant-Current LED Driver 3.3V TIMING CHARACTERISTICS (Typical Operating Circuit 5.5V, T PARAMETER SYMBOL CLK Clock Period CLK Pulse-Width High CLK Pulse-Width Low DIN Setup Time DIN Hold Time DOUT Propagation Delay DOUT Rise and ...

Page 5

Constant-Current LED Driver (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS ON 360Ω) SET +125° +85° -40°C ...

Page 6

Constant-Current LED Driver PIN NAME 1 GND Ground 2 DIN Serial-Data Input. Data is loaded into the internal 8-bit shift register on CLK’s rising edge. 3 CLK Serial-Clock Input. Data is loaded into the internal 8-bit shift register ...

Page 7

Constant-Current LED Driver Detailed Description The MAX6968 LED driver comprises a 4-wire serial interface driving eight constant-current sinking open- drain output ports. The outputs drive LEDs in either static or multiplex applications (Figure 1). The constant- current outputs ...

Page 8

Constant-Current LED Driver LE t LRF OUT_ LE t LRR OUT_ CLK t CRF OUT_ CLK t CRR OUT_ Figure 3. LE and CLK to OUT_ Timing Table 1. 4-Wire Serial-Interface Truth Table SHIFT-REGISTER SERIAL CLOCK CONTENTS DATA ...

Page 9

Constant-Current LED Driver Applications Information Selecting External Component R LED Output Current The MAX6968 uses an external resistor R LED current for outputs OUT0–OUT7. The minimum allowed value 307.6Ω, which sets the output SET currents ...

Page 10

Constant-Current LED Driver NO. OF PART OUTPUTS MAX6968 MAX6977 8 MAX6978 MAX6970 MAX6981 8 MAX6980 MAX6969 MAX6984 16 MAX6979 MAX6971 16 MAX6982 MAX6983 +5V µC V+ SCLK CLK MOSI DIN MISO DOUT LOAD LATCH ENABLE OE 360Ω SET ...

Page 11

Constant-Current LED Driver (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, TSSOP, 4.40 MM BODY, EXPOSED ...

Page 12

Constant-Current LED Driver (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 12 ______________________________________________________________________________________ Package Information (continued) ...

Page 13

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2005 Maxim Integrated Products ...

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