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
(T
MIN
to T
MAX
) ............................................. -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 Circuits, V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
Operating Supply Voltage
SYMBOL
V+
Shutdown mode, all
digital inputs at V+
or GND
All segments on, all
digits scanned,
intensity set to full,
internal oscillator,
DOUT open circuit,
no display or
OSC_OUT load
connected
T
A
= +25°C
T
A
= T
MIN
to T
MAX
CONDITIONS
MIN
2.7
10
TYP
MAX
5.5
35
40
UNITS
V
Shutdown Supply Current
I
SHDN
µA
Operating Supply Current
I+
T
A
= +25°C
22
30
mA
T
A
= T
MIN
to T
MAX
4
1
95
1.7
50
50
35
MHz
8
kHz
V
ns
ns
1
0.5
49.5
50.5
s
s
%
Master Clock Frequency
Dead Clock Protection Frequency
OSC Internal/External Detection
Threshold
OSC High Time
OSC Low Time
Slow Segment Blink Period
Fast Segment Blink Period
Fast or Slow Segment Blink Duty
Cycle
f
OSC
f
OSC
V
OSC
t
CH
t
CL
f
SLOWBLINK
f
FASTBLINK
OSC = RC oscillator, R
SET
= 56kW,
C
SET
= 22pF, V+ = 3.3V
OSC driven externally
OSC = RC oscillator, R
SET
= 56kW,
C
SET
= 22pF, V+ = 3.3V
OSC = RC oscillator, R
SET
= 56kW,
C
SET
= 22pF, V+ = 3.3V
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Maxim Integrated
│
2
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
DC Electrical Characteristics (continued)
(Typical Operating Circuits, V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
Segment Drive Source Current
Segment Current Slew Rate
Segment Drive Current Matching
LOGIC INPUTS AND OUTPUTS
Input Leakage Current
DIN, CLK,
CS,
OSC, P0, P1, P2,
P3, P4
4-Wire Logic-High Input Voltage
DIN, CLK,
CS
4-Wire Logic-Low Input Voltage
DIN, CLK,
CS
Port Logic-High Input Voltage
P0, P1, P2, P3, P4
Port Logic-Low Input Voltage
P0, P1, P2, P3, P4
Port Hysteresis Voltage P0, P1,
P2, P3, P4
Port Input Pullup Current from V+
Port Output Low Voltage
Blink Output Low Voltage
DOUT Output High Voltage
DOUT Output Low Voltage
OSC_OUT Output High Voltage
OSC_OUT Output Low Voltage
I
IH
, I
IL
V
IHSPI
V
ILSPI
V
IHP
V
ILP
DV
IP
I
IPU
V
OLP
V
OLBK
V
OHDO
V
OLDO
V
OHOSC
V
OLOSC
P0 to P3 configured as keyscan input,
V+ = 3.3V
I
SINK
= 8mA
I
SINK
= 0.6mA
I
SOURCE
= 1.6mA
I
SINK
= 1.6mA
I
SOURCE
= 1.6mA
I
SINK
= 1.6mA
V+ -
0.4
0.4
V+ -
0.2
0.2
0.03 x
V+
75
0.3
0.1
0.5
0.3
0.7 x
V+
0.3 x
V+
-1
1.8
0.6
+1
µA
V
V
V
V
V
µA
V
V
V
V
V
V
SYMBOL
I
SEG
DI
SEG
/Dt
DI
SEG
V
LED
= 2.2V,
V+ = 3.3V
CONDITIONS
T
A
= +25°C
MIN
-34.5
TYP
-40
11
5
10
MAX
-46.5
UNITS
mA
mA/µs
%
T
A
= +25°C, V+ = 3.3V
T
A
= +25°C, V+ = 3.3V
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Maxim Integrated
│
3
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
Timing Characteristics
PARAMETER
CLK Clock Period
CLK Pulse Width High
CLK Pulse Width Low
(Typical
Operating Circuits,
V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
SYMBOL
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
DO
t
FT
t
CSW
V+ = 3.0V to 5.5V
V+ = 2.7V
C
LOAD
= 10pF, V+ = 3.0V to 5.5V
19.5
CONDITIONS
MIN
38.4
16
16
9.5
0
9.5
0
19
25
10
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CS
Fall to CLK Rise Setup Time
CLK Rise to
CS
Rise Hold Time
DIN Setup Time
DIN Hold Time
Output Data Propagation Delay
DOUT Output Rise and Fall Times
Minimum
CS
Pulse High
Note 1:
All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Typical Operating Characteristics
INTERNAL OSCILLATOR FREQUENCY
vs. TEMPERATURE
MAX6954 toc01
(V+ = 3.3V, LED forward voltage = 2.4V, typical application circuit, T
A
= +25°C, unless otherwise noted.)
INTERNAL OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
OSCILLATOR FREQUENCY (MHz)
4.4
R
SET
= 56kΩ
C
SET
= 22pF
MAX6954 toc02
INTERNAL OSCILLATOR WAVEFORM
AT OSC AND OSC_OUT PINS
R
SET
= 56kΩ
C
SET
= 22pF
OSC
4.4
OSCILLATOR FREQUENCY (MHz)
MAX6954 toc03
R
SET
= 56kΩ
C
SET
= 22pF
4.2
4.2
0V
4.0
4.0
3.8
3.8
OSC_OUT
0V
3.6
-40
-10
20
50
80
110
3.6
2.5
3.0
3.5
4.0
4.5
5.0
5.5
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
100ns/div
OSC: 500mV/div
OSC_OUT: 2V/div
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Maxim Integrated
│
4
MAX6954
4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
Typical Operating Characteristics (continued)
(V+ = 3.3V, LED forward voltage = 2.4V, typical application circuit, T
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