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MAX6955

2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan

Maxim Integrated 

MAX6955

2-Wire Interfaced, 2.7V to 5.5V

LED Display Driver with I/O

Expander and Key Scan

Absolute Maximum Ratings

Voltage (with Respect to GND)

V+ .........................................................................-0.3V to +6V

SCL, SDA, AD0, AD1 ...........................................-0.3V to +6V

All Other Pins............................................-0.3V to (V+ + 0.3V)

Current

O0–O7 Sink Current ......................................................935mA

O0–O18 Source Current .................................................55mA

SCL, SDA, AD0, AD1, BLINK, OSC, OSC_OUT, ISET ....20mA

P0, P1, P2, P3, P4/IRQ ....................................................40mA

GND .....................................................................................1A

Continuous Power Dissipation (TA = +70°C)

36-Pin SSOP (derate at 11.8mW/°C above +70°C) .....941mW

40-Pin TQFN (derate at 25.6mW/°C above +70°C)....2051.3mW

Operating Temperature Range

(TMIN to TMAX) ...............................................-40°C to +125°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+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.

DC Electrical Characteristics

(Typical Operating Circuit, V+ = 2.7V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)

PARAMETER

Operating Supply Voltage

SYMBOL

V+

CONDITIONS

MIN TYP MAX UNITS

2.7

5.5

V

Shutdown Supply Current

ISHDN

Shutdown mode, all

digital inputs at V+

or GND

TA = +25°C

TA = TMIN to TMAX

10

35

µA

40

Operating Supply Current

All segments on, all

digits scanned,

TA = +25°C

I+

intensity set to full,

internal oscillator, no

display or OSC_OUT TA = TMIN to TMAX

load connected

22

30

mA

35

Master Clock Frequency

fOSC

OSC = RC oscillator, RSET = 56kΩ,

CSET = 22pF, V+ = 3.3V

OSC driven externally

4

MHz

1

8

Dead Clock Protection Frequency

fOSC

95

kHz

OSC Internal/External Detection

Threshold

VOSC

1.7

V

OSC High Time

tCH

50

ns

OSC Low Time

tCL

50

ns

Slow Segment Blink Period

OSC = RC oscillator, RSET = 56kΩ,

fSLOWBLINK CSET = 22pF, V+ = 3.3V

1

s

Fast Segment Blink Period

Fast or Slow Segment Blink Duty

Cycle

fFASTBLINK

OSC = RC oscillator, RSET = 56kΩ,

CSET = 22pF, V+ = 3.3V

0.5

s

49.5

50.5

%

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