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MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
2
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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)
Current
O0–O7 Sink Current ......................................................935mA
O0–O18 Source Current .................................................55mA
DIN, CLK,
CS, OSC, DOUT, BLINK, OSC_OUT, ISET ....20mA
P0, P1, P2, P3, P4 ...........................................................40mA
GND .....................................................................................1A
Continuous Power Dissipation (TA = +70°C)
36-Pin SSOP (derate at 11.8mW/°C above +70°C) .....941mW
40-Pin PDIP (derate at 16.7mW/°C above +70°C).....1333mW
40-Pin TQFN (derate at 37mW/°C above +70°C) ......2963mW
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
DC ELECTRICAL CHARACTERISTICS
(
Typical Operating Circuits, V+ = 2.7V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage
V+
2.7
5.5
V
TA = +25°C
10
35
Shutdown Supply Current
ISHDN
Shutdown mode, all
digital inputs at V+
or GND
TA = TMIN to TMAX
40
A
TA = +25°C
22
30
Operating Supply Current
I+
All segments on, all
digits scanned,
intensity set to full,
internal oscillator,
DOUT open circuit,
no display or
OSC_OUT load
connected
TA = TMIN to TMAX
35
mA
OSC = RC oscillator, RSET = 56k
Ω,
CSET = 22pF, V+ = 3.3V
4
Master Clock Frequency
fOSC
OSC driven externally
1
8
MHz
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
fSLOWBLINK
OSC = RC oscillator, RSET = 56k
Ω,
CSET = 22pF, V+ = 3.3V
1s
Fast Segment Blink Period
fFASTBLINK
OSC = RC oscillator, RSET = 56k
Ω,
CSET = 22pF, V+ = 3.3V
0.5
s
Fast or Slow Segment Blink Duty
Cycle
49.5
50.5
%