General Description
The MAX7300 compact, serial-interfaced, I/O expan-
sion peripheral provides microprocessors with up to 28
ports. Each port is individually user configurable to
either a logic input or logic output.
Each port can be configured as either a push-pull logic
output capable of sinking 10mA and sourcing 4.5mA, or a
Schmitt logic input with optional internal pullup. Seven
ports feature configurable transition detection logic, which
generates an interrupt upon change of port logic level.
The MAX7300 is controlled through an I
2
CTM-compatible
2-wire serial interface, and uses four-level logic to allow
16 I
2
C addresses from only two select pins.
The MAX7300AAX and MAX7300AGL have 28 ports
and are available in 36-pin SSOP and 40-pin QFN pack-
ages, respectively. The MAX7300AAI and MAX7300ANI
have 20 ports and are available in 28-pin SSOP and 28-
pin DIP packages, respectively.
Applications
White Goods
Industrial Controllers
Automotive
System Monitoring
Features
o 400kbps I
2
C-Compatible Serial Interface
o 2.5V to 5.5V Operation
o -40C to +125C Temperature Range
o 20 or 28 I/O Ports, Each Configurable as
Push-Pull Logic Output
Schmitt Logic Input
Schmitt Logic Input with Internal Pullup
o 11A (max) Shutdown Current
o Logic Transition Detection for Seven I/O Ports
MAX7300
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
________________________________________________________________ Maxim Integrated Products
1
19-2413; Rev 1; 2/03
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
MAX7300ANI
-40
C to +125C
28 DIP
MAX7300AAI
-40
C to +125C
28 SSOP
MAX7300AAX
-40
C to +125C
36 SSOP
MAX7300AGL
-40
C to +125C
40 QFN
I
2
C is a trademark of Philips Corp.
P5
P4
P7
P8
P6
P10
P9
P12
P13
P11
P15
P14
P17
P18
P16
P20
P19
I/O 5
I/O 4
I/O 7
I/O 8
I/O 6
I/O 10
I/O 9
I/O 12
I/O 13
I/O 11
I/O 15
I/O 14
I/O 17
I/O 18
I/O 16
I/O 20
I/O 19
I/O 21
I/O 22
I/O 23
P22
P23
P21
36
2
3
4
33
35
34
29
27
31
24
25
22
21
23
V+
GND
GND
AD0
AD1
SCL
P30
P29
P31
P27
P28
P25
P24
P26
32
30
26
5
7
9
28
6
8
11
10
12
14
15
13
17
16
19
20
18
SDA
MAX7300AAX
3V
DATA
CLOCK
I/O 24
I/O 25
I/O 27
I/O 26
I/O 29
I/O 30
I/O 28
I/O 31
47nF
39k
1
ISET
Typical Operating Circuit
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V+
AD1
SCL
SDA
P31
P30
P22
P29
P28
P27
P26
P25
P24
P23
P21
P20
P19
P18
P17
P16
P15
P14
P13
P12
AD0
GND
GND
ISET
SSOP/DIP
TOP VIEW
MAX7300
Pin Configurations
Pin Configurations continued at end of data sheet.
MAX7300
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
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
SCL, SDA, AD0, AD1................................................-0.3V to +6V
All Other Pins................................................-0.3V to (V+ + 0.3V)
P4P31 Current ................................................................30mA
GND Current .....................................................................800mA
Continuous Power Dissipation (T
A
= +70C)
28-Pin PDIP (derate 20.8mW/C above +70C).........1667mW
28-Pin SSOP (derate 9.5mW/C above +70C) ...........762mW
36-Pin SSOP (derate 11.8mW/C above +70C) .........941mW
40-Pin QFN (derate 23.25mW/C aboveT
A
= +70C)..1860mW
Operating Temperature Range
(T
MIN
to T
MAX
) ...............................................-40C to +125C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit, V+ = 2.5V 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+
2.5
5.5
V
T
A
= +25C
5.5
8
T
A
= -40C to +85C
10
Shutdown Supply Current
I
SHDN
All digital inputs at
V+ or GND
T
MIN
to T
MAX
11
A
T
A
= +25C
180
240
T
A
= -40C to +85C
260
Operating Supply Current
I
GPOH
All ports programmed
as outputs high, no
load, all other inputs
at V+ or GND
T
MIN
to T
MAX
280
A
T
A
= +25C
170
210
T
A
= -40C to +85C
230
Operating Supply Current
I
GPOL
All ports programmed
as outputs low, no
load, all other inputs
at V+ or GND
T
MIN
to T
MAX
240
A
T
A
= +25C
110
135
T
A
= -40C to +85C
140
Operating Supply Current
I
GPI
All ports programmed
as inputs without
pullup, ports, and all
other inputs at V+ or
GND
T
MIN
to T
MAX
145
A
INPUTS AND OUTPUTS
Logic High Input Voltage
Port Inputs
V
IH
0.7 x
V+
V
Logic Low Input Voltage
Port Inputs
V
IL
0.3 x
V+
V
Input Leakage Current
I
IH
, I
IL
GPIO inputs without pullup,
V
PORT
= V+ to GND
-100
1
+100
nA
V+ = 2.5V
12
19
30
GPIO Input Internal Pullup to V+
I
PU
V+ = 5.5V
80
120
180
A
Hysteresis Voltage GPIO Inputs
V
I
0.3
V
MAX7300
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V+ = 2.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GPIO outputs, I
SOURCE
= 2mA,
T
A
= -40C to +85C
V+ -
0.7
Output High Voltage
V
OH
GPIO outputs, I
SOURCE
= 1mA,
T
A
= T
MIN
to T
MAX
(Note 2)
V+ -
0.7
V
Port Sink Current
I
OL
V
PORT
= 0.6V
2
10
18
mA
Output Short-Circuit Current
I
OLSC
Port configured output low, shorted to V+
2.75
11
20
mA
Input High-Voltage SDA, SCL,
AD0, AD1
V
IH
0.7 x
V+
V
Input Low-Voltage SDA, SCL,
AD0, AD1
V
IL
0.3 x
V+
V
Input Leakage Current SDA, SCL
I
IH
, I
IL
-50
+50
nA
Input Capacitance
(Note 2)
10
pF
Output Low-Voltage SDA
V
OL
I
SINK
= 6mA
0.4
V
TIMING CHARACTERISTICS (Figure 2)
(V+ = 2.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Serial Clock Frequency
f
SCL
400
kHz
Bus Free Time Between a STOP
and a START Condition
t
BUF
1.3
s
Hold Time (Repeated) START
Condition
t
HD, STA
0.6
s
Repeated START Condition
Setup Time
t
SU, STA
0.6
s
STOP Condition Setup Time
t
SU, STO
0.6
s
Data Hold Time
t
HD, DAT
(Note 3)
15
900
ns
Data Setup Time
t
SU, DAT
100
ns
SCL Clock Low Period
t
LOW
1.3
s
SCL Clock High Period
t
HIGH
0.7
s
Rise Time of Both SDA and SCL
Signals, Receiving
t
R
(Notes 2, 4)
20 +
0.1C
b
300
ns
Fall Time of Both SDA and SCL
Signals, Receiving
t
F
(Notes 2, 4)
20 +
0.1C
b
300
ns
Fall Time of SDA Transmitting
t
F
,
TX
(Notes 2, 5)
20 +
0.1C
b
250
ns
Pulse Width of Spike Suppressed
t
SP
(Notes 2, 6)
0
50
ns
Capacitive Load for Each Bus
Line
C
b
(Note 2)
400
pF
MAX7300
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
4
_______________________________________________________________________________________
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX7300 toc02
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
97.5
70.0
42.5
15.0
-12.5
4
5
6
7
8
3
-40.0
125.0
V+ = 5.5V
V+ = 3.3V
V+ = 2.5V
OPERATING SUPPLY CURRENT vs. V+
(OUTPUTS UNLOADED)
MAX7300 toc03
V+ (V)
SUPPLY CURRENT ( mA)
5.0
4.5
4.0
3.5
3.0
2.5
1
0.1
2.0
5.5
ALL PORTS OUTPUT (1)
ALL PORTS INPUT
(PULLUPS DISABLED)
ALL PORTS OUTPUT (0)
OPERATING SUPPLY CURRENT
vs. TEMPERATURE
MAX7300 toc01
TEMPERATURE (
C)
SUPPLY CURRENT (mA)
97.5
70.0
42.5
15.0
-12.5
0.04
0.08
0.12
0.16
0.20
0.24
0.28
0.32
0.36
0.40
0
-40.0
125.0
V+ = 2.5V TO 5.5V
NO LOAD
ALL PORTS
OUTPUT (1)
ALL PORTS
OUTPUT (0)
ALL PORTS INPUT HIGH
__________________________________________Typical Operating Characteristics
(R
ISET
= 39k
, T
A
= +25C, unless otherwise noted.)
TIMING CHARACTERISTICS (Figure 2) (continued)
(V+ = 2.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
Note 1: All parameters tested at T
A
= +25C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.
Note 3: A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
IL
of the SCL signal) in order to
bridge the undefined region of SCL's falling edge.
Note 4: C
b
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3V+ and 0.7V+.
Note 5: I
SINK
6mA. C
b
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3V+ and 0.7V+.
Note 6: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
MAX7300
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
_______________________________________________________________________________________
5
GPO SOURCE CURRENT vs. TEMPERATURE
(OUTPUT = 1)
MAX7300 toc05
TEMPERATURE (
C)
PORT SOURCE CURRENT (mA)
97.5
70.0
42.5
15.0
-12.5
3
4
5
6
7
8
9
2
-40.0
125.0
V
PORT
= 1.4V
V+ = 5.5V
V+ = 3.3V
V+ = 2.5V
GPO SINK CURRENT vs. TEMPERATURE
(OUTPUT = 0)
MAX7300 toc04
TEMPERATURE (
C)
PORT SINK CURRENT (mA)
97.5
70.0
-12.5
15.0
42.5
4
6
8
10
12
14
16
18
2
-40.0
125.0
V+ = 2.5V TO 5.5V, V
PORT
= 0.6V
GPI PULLUP CURRENT
vs. TEMPERATURE
MAX7300 toc06
TEMPERATURE (
C)
PULLUP CURRENT (
A)
97.5
70.0
42.5
15.0
-12.5
100
1000
10
-40.0
125.0
V+ = 5.5V
V+ = 3.3V
V+ = 2.5V
GPO SHORT-CIRCUIT CURRENT
vs. TEMPERATURE
MAX7300 toc07
TEMPERATURE (
C)
PORT CURRENT (mA)
97.5
70.0
42.5
15.0
-12.5
10
100
1
-40.0
125.0
GPO = 0, PORT
SHORTED TO V+
GPO = 1, PORT
SHORTED TO GND
Typical Operating Characteristics (continued)
(R
ISET
= 39k
, T
A
= +25C, unless otherwise noted.)
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