19-3381; Rev 3; 12/07
KIT
ATION
EVALU
BLE
AVAILA
2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection
General Description
The MAX7318 2-wire-interfaced expander provides 16-
bit parallel input/output (I/O) port expansion for SMBus™
and I
2
C applications. The MAX7318 consists of input
port registers, output port registers, polarity inversion
registers, configuration registers, and an I
2
C-compatible
serial interface logic compatible with SMBus. The sys-
tem master can invert the MAX7318 input data by writing
to the active-high polarity inversion register.
Any of the 16 I/O ports can be configured as an input or
output. A power-on reset (POR) initializes the 16 I/Os
as inputs. Three address select pins configure one of
64 slave ID addresses.
The MAX7318 supports hot insertion. All port pins, the
INT
output, SDA, SCL, and the slave address inputs
AD0–2 remain high impedance in power-down (V+ =
0V) with up to 6V asserted upon them.
The MAX7318 is available in 24-pin SO, SSOP, TSSOP,
and thin QFN packages and is specified over the -40°C
to +125°C automotive temperature range.
For applications requiring an SMBus timeout function,
refer to the MAX7311 data sheet.
♦
2V to 5.5V Operation
♦
5.5V Overvoltage-Tolerant I/Os
♦
Supports Hot Insertion
♦
16 I/O Pins that Default to Inputs on Power-Up
♦
100kΩ Pullup on Each I/O
♦
Open-Drain Interrupt Output (INT)
♦
Noise Filter on SCL/SDA Inputs
♦
64 Slave ID Addresses Available
♦
Low Standby Current (5.4µA typ)
♦
Polarity Inversion
♦
4mm
✕
4mm, 0.8mm Thin QFN Package
♦
-40°C to +125°C Operation
Features
♦
400kbps I
2
C-Compatible Serial Interface
MAX7318
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
PKG
CODE
—
—
T2444-4
—
Applications
Servers
RAID Systems
Industrial Control
Medical Equipment
PLCs
Instrumentation and Test Measurement
MAX7318AWG -40°C to +125°C 24 Wide SO
MAX7318AAG
MAX7318ATG
MAX7318AUG
-40°C to +125°C 24 SSOP
-40°C to +125°C
24 Thin QFN
(4mm
✕
4mm)
-40°C to +125°C 24 TSSOP
SMBus is a trademark of Intel Corp.
Pin Configurations
I/O15
I/O12
14
18
INT 1
AD1 2
AD2 3
I/O0 4
I/O1 5
I/O2 6
I/O3 7
I/O4 8
I/O5 9
I/O6 10
I/O7 11
GND 12
24 V+
SCL 19
23 SDA
SDA 20
22 SCL
V+ 21
21 AD0
10 I/O8
INT 22
20 I/O15
AD1 23
19 I/O14
AD2 24
18 I/O13
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
17 I/O12
16 I/O11
15 I/O10
14 I/O9
13 I/O8
1
2
3
4
5
6
7
I/O6
8
I/O7
11 I/O9
12 I/O10
17
16
I/O14
15
13
I/O11
AD0
TOP VIEW
MAX7318
MAX7318ATG
I/O13
9
GND
THIN QFN
TSSOP/SSOP/SO
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection
MAX7318
ABSOLUTE MAXIMUM RATINGS
V+ to GND ................................................................-0.3V to +6V
I/O0–I/O15 as Inputs ....................................(GND - 0.3V) to +6V
SCL, SDA, AD0, AD1, AD2,
INT...................(GND
- 0.3V) to +6V
Maximum V+ Current......................................................+250mA
Maximum GND Current ...................................................-250mA
DC Input Current on I/O0–I/O15 .......................................±20mA
DC Output Current on I/O0–I/O15 ....................................±80mA
Continuous Power Dissipation (T
A
= +70°C)
24-Pin Wide SO (derate 11.8mW/°C above +70°C) ....941mW
24-Pin SSOP (derate 8.0mW/°C above +70°C) ...........640mW
24-Pin TSSOP (derate 12.2mW/°C above +70°C) .......976mW
24-Pin Thin QFN (derate 20.8mW/°C above +70°C) .1667mW
Operating Temperature Range .........................-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
(V+ = 2V to 5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage
Supply Current
SYMBOL
V+
V+ = 2V
I
+
All I/Os unloaded,
f
SCL
= 400kHz
All I/Os unloaded,
f
SCL
= 0
V+ = 3.3V
V+ = 5.5V
V+ = 2V
Standby Current
Power-On Reset Voltage
SCL, SDA
Input-Voltage Low
Input-Voltage High
Low-Level Output Voltage
Leakage Current
Input Capacitance
I/O_
Input-Voltage Low
Input-Voltage High
Input Leakage Current
Internal Pullup Current
Low-Level Output Current
I
SINK
V
IL
V
IH
T
A
= -40°C to +85°C; includes internal
pullup current, V
IO
= V+
T
A
= -40°C to +85°C, V
IO
= 0
V+ = 2V, V
OL
= 0.5V
V+ = 3.3V, V
OL
= 0.5V
V+ = 5V, V
OL
= 0.5V
High Output Current
AD0, AD1, AD2
Input-Voltage Low
Input-Voltage High
V
IL
V
IH
0.7 x V+
0.3 x V+
V
V
I
SOURCE
V+ = 3.3V, V
OH
= 2.4V
V+ = 5V, V
OH
= 4.5V
29
8.5
17
34
17
32
43
41
31
mA
mA
1.8
1
100
0.8
V
V
µA
µA
V
IL
V
IH
V
OL
I
L
I
SINK
= 6mA
-1
10
0.7 x V+
0.4
+1
0.3 x V+
V
V
V
µA
pF
I
STBY
V
POR
V+ = 3.3V
V+ = 5.5V
CONDITIONS
MIN
2.0
24
45
83
4.8
5.4
6.4
1.4
TYP
MAX
5.5
36
62
124
12.1
14.4
19.4
1.7
V
µA
µA
UNITS
V
2
_______________________________________________________________________________________
2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection
DC ELECTRICAL CHARACTERISTICS (continued)
(V+ = 2V to 5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Leakage Current
Input Capacitance
INT
Low-Level Output Current
I
OL
V
OL
= 0.4V
6
mA
SYMBOL
CONDITIONS
MIN
-1
4
TYP
MAX
+1
UNITS
µA
pF
MAX7318
AC ELECTRICAL CHARACTERISTICS
(V+ = 2V to 5.5V, T
A
= -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
SCL Clock Frequency
Bus Free Time Between STOP
and START Conditions
Hold Time (Repeated) START
Condition
Repeated START Condition
Setup Time
STOP Condition Setup Time
Data Hold Time
Data Setup Time
SCL Low Period
SCL High Period
SDA Fall Time
Pulse Width of Spike Suppressed
PORT TIMING
Output Data Valid
Input Data Setup Time
Input Data Hold Time
INTERRUPT TIMING
Interrupt Valid
Interrupt Reset
t
IV
t
IR
Figure 9
Figure 9
30.5
2
µs
µs
t
PV
Figure 7
27
0
3
µs
µs
µs
SYMBOL
f
SCL
t
BUF
t
HD,STA
t
SU,STA
t
SU,STO
t
HD,DAT
t
SU,DAT
t
LOW
t
HIGH
t
F
t
SP
Figure 2
Figure 2
Figure 2
Figure 2
Figure 2 (Note 2)
Figure 2
Figure 2
Figure 2
Figure 2 (Notes 3, 4)
(Note 5)
V+ < 3.3V
V+
≥
3.3V
50
100
1.3
0.7
500
250
1.3
0.6
0.6
0.6
0.9
CONDITIONS
MIN
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
ns
µs
µs
ns
ns
Note 1:
All parameters are 100% production tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2:
A master device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V
IL
of the SCL
signal) to bridge the undefined region SCL’s falling edge.
Note 3:
C
B
= total capacitance of one bus line in pF.
Note 4:
The maximum t
F
for the SDA and SCL bus lines is specified at 300ns. The maximum fall time for the SDA output stage t
F
is
specified at 250ns. This allows series protection resistors to be connected between the SDA and SCL pins and the SDA/SCL
bus lines without exceeding the maximum specified t
F
.
Note 5:
Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
_______________________________________________________________________________________
3
2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection
MAX7318
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX7318 toc01
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
SCL = V+
ALL I/Os UNLOADED
V+ = 5V
V+ = 3.3V
MAX7318 toc02
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
90
80
SUPPLY CURRENT (μA)
70
60
50
40
30
20
10
f
SCL
= 400kHz
ALL I/Os UNLOADED
MAX7318 toc03
100
90
80
SUPPLY CURRENT (μA)
70
60
50
40
30
20
10
0
-50
f
SCL
= 400kHz
ALL I/Os UNLOADED
V+ = 5V
12
10
SUPPLY CURRENT (μA)
8
6
4
100
V+ = 3.3V
V+ = 2V
2
0
V+ = 2V
0
-50
-25
0
25
50
75
100
125
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
-25
0
25
50
75
100
125
TEMPERATURE (°C)
I/O SINK CURRENT
vs. OUTPUT LOW VOLTAGE
MAX7318 toc04
I/O SINK CURRENT
vs. OUTPUT LOW VOLTAGE
MAX7318 toc05
I/O SINK CURRENT
vs. OUTPUT LOW VOLTAGE
V+ = 5V
T
A
= -40°C
45
40
35
T
A
= +25°C
MAX7318 toc06
24
22
20
18
16
14
12
10
8
6
4
2
0
0
I
SINK
(mA)
V+ = 2V
T
A
= -40°C
50
45
40
35
I
SINK
(mA)
V+ = 3.3V
T
A
= -40°C
50
T
A
= +25°C
I
SINK
(mA)
T
A
= +25°C
30
25
20
15
10
5
0
30
25
20
15
10
5
0
T
A
= +125°C
T
A
= +125°C
T
A
= +125°C
0.1
0.2
0.3
V
OL
(V)
0.4
0.5
0.6
0
0.1
0.2
0.3
V
OL
(V)
0.4
0.5
0.6
0
0.1
0.2
0.3
0.4
0.5
V
OL
(V)
I/O OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX7318 toc07
I/O SOURCE CURRENT
vs. OUTPUT HIGH VOLTAGE
MAX7318 toc08
I/O SOURCE CURRENT
vs. OUTPUT HIGH VOLTAGE
V+ = 3.3V
T
A
= -40°C
45
40
35
I
SOURCE
(mA)
30
25
20
15
10
5
T
A
= +125°C
T
A
= +25°C
MAX7318 toc09
400
350
300
V
OL
(mV)
250
200
150
100
50
0
-50
-25
0
25
50
75
100
V+ = 2V, I
SINK
= 1mA
V+ = 5V, I
SINK
= 1mA
V+ = 2V, I
SINK
= 10mA
V+ = 5V, I
SINK
= 10mA
25
50
V+ = 2V
T
A
= -40°C
T
A
= +25°C
20
I
SOURCE
(mA)
15
10
T
A
= +125°C
5
0
125
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
TEMPERATURE (°C)
V+
- V
OH
(V)
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
V+
- V
OH
(V)
4
_______________________________________________________________________________________
2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
I/O SOURCE CURRENT
vs. OUTPUT HIGH VOLTAGE
45
40
35
I
SOURCE
(mA)
V+
- V
OH
(V)
30
25
20
15
10
5
0
0
0.1
0.2
0.3
V+
- V
OH
(V)
0.4
0.5
0.6
0
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
T
A
= +125°C
100
V+ = 5V, I
SOURCE
= 10mA
T
A
= +25°C
300
V+ = 5V
T
A
= -40°C
MAX7318 toc10
MAX7318
I/O HIGH VOLTAGE vs. TEMPERATURE
MAX7318 toc11
50
500
400
V+ = 2V, I
SOURCE
= 10mA
200
Pin Description
PIN
TSSOP/
SSOP/SO
1
2
3
4–11
12
13–20
21
22
23
24
—
THIN
QFN
22
23
24
1–8
9
10–17
18
19
20
21
—
NAME
INT
AD1
AD2
I/O0–I/O7
GND
AD0
SCL
SDA
V+
EP
Interrupt Output (Open Drain)
Address Input 1
Address Input 2
Input/Output Port 1
Supply Ground
Address Input 0
Serial Clock Line
Serial Data Line
Supply Voltage. Bypass with a 0.047µF capacitor to GND.
Exposed Pad on Package Underside. Connect to GND.
FUNCTION
I/O8–I/O15 Input/Output Port 2
_______________________________________________________________________________________
5
