19-2698; Rev 3; 2/05
2-Wire-Interfaced 8-Bit I/O Port Expander
with Reset
General Description
The MAX7310 provides 8-bit parallel input/output port
expansion for SMBus™-compatible and I
2
C-compatible
applications. The MAX7310 consists of an input port
register, an output port register, a polarity inversion reg-
ister, a configuration register, a bus timeout register,
and an SMBus/I
2
C-compatible serial interface. The sys-
tem master can invert the MAX7310 input data by writ-
ing to the active-high polarity inversion register. The
system master can enable or disable bus timeout by
writing to the bus timeout register.
Any of the eight I/O ports may be configured as input or
output. An active-low reset input sets the eight I/Os as
inputs. Three address select pins configure one of 56
slave ID addresses.
The MAX7310 is available in 16-pin thin QFN, TSSOP,
and QSOP packages and is specified over the -40°C to
+125°C automotive temperature range.
♦
400kHz 2-Wire Interface
♦
2.3V to 5.5V Operation
♦
Low Standby Current (1.7µA typ)
♦
Bus Timeout for Lock-Up-Free Operation
♦
56 Slave ID Addresses
♦
Polarity Inversion
♦
Eight I/O Pins that Default to Inputs on Power-Up
♦
5V Tolerant Open-Drain Output on I/O0
♦
4mm x 4mm, 0.8mm Thin QFN Package
♦
-40°C to +125°C Operation
Features
MAX7310
Applications
Servers
RAID Systems
Industrial Control
Medical Equipment
Instrumentation, Test Measurement
SMBus is a trademark of Intel Corp.
PART
MAX7310AUE
MAX7310AEE
MAX7310ATE
Ordering Information
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
—
—
T1644-4
-40°C to +125°C 16 TSSOP
-40°C to +125°C 16 QSOP
-40°C to +125°C 16 Thin QFN
Pin Configurations
I/O7
I/O6
TOP VIEW
SCL
1
SDA
2
AD0
3
AD1
4
AD2
5
I/O0
6
I/O1
7
GND
8
16
V+
15
RESET
14
I/O7
13
I/O6
V+
SCL
SDA
14
15
16
RESET
13
12
11
10
I/O5
I/O4
9
8
7
I/O3
I/O2
GND
I/O1
MAX7310
12
I/O5
11
I/O4
10
I/O3
9
I/O2
MAX7310ATE
6
5
1
AD0
2
AD1
3
AD2
4
I/O0
TSSOP/QSOP
THIN QFN
________________________________________________________________
Maxim Integrated Products
1
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.
2-Wire-Interfaced 8-Bit I/O Port Expander
with Reset
MAX7310
ABSOLUTE MAXIMUM RATINGS
V+ to GND ................................................................-0.3V to +6V
I/O1–I/O7 as an Input .......................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
I/O0 as an Input..............................................(V
SS
- 0.3V) to +6V
SCL, SDA, AD0, AD1, AD2,
RESET
...............(V
SS
- 0.3V) to +6V
DC Current on I/O0 ........................................................ +400µA
DC Current on I/O1 to I/O7 .............................................
±50mA
Maximum GND and V+ Current........................................180mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TSSOP (derate 5.7mW/°C above +70°C) .........457mW
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
16-Pin Thin QFN (derate 16.9mW/°C above +70°C) ...1349mW
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+ = 2.3V to 5.5V, GND = 0,
RESET
= V+, 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+
I+
All outputs floating,
all inputs at V+ or GND,
f
SCL
= 400kHz
All outputs floating,
all inputs at V+ or GND,
f
SCL
= 0
V+ = 2.3V
V+ = 3.3V
V+ = 5.5V
V+ = 2.3V
V+ = 3.3V
V+ = 5.5V
CONDITIONS
MIN
2.3
19
29
65
1.5
1.7
2.1
1.6
V
IL
V
IH
V
OIL
I
L
C
I
V
IL
V
IH
I
L
I
OL
All inputs at V+ or GND
V+ = 2.3V, V
OL
= 0.5V
Low-Level Output Current
V+ = 3.3V, V
OL
= 0.5V
V+ = 5.5V, V
OL
= 0.5V
High Output Current for I/O1–I/O7
AD0, AD1, AD2, AND
RESET
Input Voltage Low
Input Voltage High
2
0.8
V
V
I
OH
V+ = 3.3V, V
OH
= 2.4V
V+ = 5.5V, V
OH
= 4.5V
2
-1
8
12.5
19
6.5
12.5
14
22
30
11
18
mA
mA
+1
I
SINK
= 6mA
-1
10
0.8
2
0.4
+1
TYP
MAX
5.5
30
40
80
3.4
3.9
5
2.1
0.8
V
V
V
V
µA
pF
V
V
µA
µA
µA
UNITS
V
Standby Current
Power-On Reset Voltage
SCL, SDA
Input Voltage Low
Input Voltage High
Low-Level Output Voltage
Leakage Current
Input Capacitance
I/Os
Input Voltage Low
Input Voltage High
Input Leakage Current
2
_______________________________________________________________________________________
2-Wire-Interfaced 8-Bit I/O Port Expander
with Reset
DC ELECTRICAL CHARACTERISTICS (continued)
(V+ = 2.3V to 5.5V, GND = 0,
RESET
= V+, 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
SYMBOL
CONDITIONS
MIN
-1
10
TYP
MAX
+1
UNITS
µA
pF
MAX7310
AC ELECTRICAL CHARACTERISTICS
(V+ = 2.3V to 5.5V, GND = 0,
RESET
= V+, T
A
= -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
SCL Clock Frequency
BUS Timeout
Bus Free Time Between STOP
and START Condition
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
SCL/SDA Fall Time (Transmitting)
Pulse Width of Spike Supressed
PORT TIMING
Output Data Valid
Input Data Setup Time
Input Data Hold Time
RESET
Reset Pulse Width
100
ns
t
PV
t
PS
t
PH
Figure 9
Figure 10
Figure 10
29
0
1
µs
µs
µs
SYMBOL
f
SCL
t
TIMEOUT
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 3)
Figure 2
Figure 2
Figure 2
Figure 2 (Note 4)
(Note 5)
50
0.1
1.3
0.7
250
(Note 2)
30
1.3
0.6
0.6
0.6
0.9
CONDITIONS
MIN
TYP
MAX
400
60
UNITS
kHz
ms
µs
µs
µs
µs
µs
µs
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:
Minimum SCL clock frequency is limited by the MAX7310 bus timeout feature, which resets the serial bus interface if either
SDA or SCL is held low for a 30ms minimum.
Note 3:
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) in
order to bridge the undefined region of SCL’s falling edge.
Note 4:
t
F
measured between 90% to 10% of V+.
Note 5:
Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
_______________________________________________________________________________________
3
2-Wire-Interfaced 8-Bit I/O Port Expander
with Reset
MAX7310
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX7310 toc01
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
MAX7310 toc02
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
f
SCL
= 440kHz,
NO LOAD ON I/O0–I/O7
MAX7310 toc03
32
31
SUPPLY CURRENT (µA)
30
29
28
27
26
V+ = 3.3V, f
SCL
= 440kHz,
NO LOAD ON I/O0–I/O7
2.50
2.25
SUPPLY CURRENT (µA)
2.00
1.75
1.50
1.25
1.00
V+ = 3.3V, f
SCL
= 0,
NO LOAD ON I/O0–I/O7
70
60
SUPPLY CURRENT (µA)
50
40
30
20
10
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
I/O0–I/O7 OUTPUT SINK CURRENT
vs. TEMPERATURE
MAX7310 toc04
I/O0–I/O7 OUTPUT SINK CURRENT
vs. SUPPLY VOLTAGE
MAX7310 toc05
I/O1–I/O7 OUTPUT SOURCE CURRENT
vs. TEMPERATURE
V+ = 2.3V,
V
OH
= 1.4V
MAX7310 toc06
30
25
V
CC
= 3.3V
SINK CURRENT (mA)
20
15
10
5
V
OL
= 0.5V
0
V
CC
= 2.3V
35
30
SINK CURRENT (mA)
25
20
15
10
5
V
OL
= 0.5V
0
9
8
SOURCE CURRENT (mA)
7
6
5
4
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4
_______________________________________________________________________________________
2-Wire-Interfaced 8-Bit I/O Port Expander
with Reset
Pin Description
PIN
TSSOP/
QSOP
1
2
3
4
5
6
7
8
9–14
15
16
—
THIN
QFN
15
16
1
2
3
4
5
6
7–12
13
14
PAD
NAME
SCL
SDA
AD0
AD1
AD2
I/O0
I/O1
GND
I/O2–I/O7
RESET
V+
Exposed
pad
Serial Clock Line
Serial Data Line
Address Input 0
Address Input 1
Address Input 2
Input/Output Port 0 (Open Drain)
Input/Output Port 1
Supply Ground
Input/Output Port 2—Input/Output Port 7
External Reset (Active Low). Pull
RESET
low to configure I/O pins as inputs. Set
RESET
high for normal operation.
Supply Voltage. Bypass with a 0.047µF capacitor to GND.
Exposed Pad on Package Underside. Connect to GND.
FUNCTION
MAX7310
AD0
AD1
AD2
SCL
SDA
INPUT
FILTER
SMBus
CONTROL
INPUT/
OUTPUT
PORTS
MAX7310
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
8 BIT
WRITE PULSE
N
READ PULSE
V+
RESET
POWER-ON
RESET
GND
Figure 1. MAX7310 Block Diagram
Detailed Description
The MAX7310 general-purpose input/output (GPIO)
peripheral provides up to eight I/O ports, controlled
through an I
2
C-compatible serial interface. The
MAX7310 consists of an input port register, an output
port register, a polarity inversion register, a configura-
tion register, and a bus timeout register. An active-low
reset input sets the eight I/O lines as inputs. Three
slave ID address select pins (AD0, AD1, and AD2)
choose one of 56 slave ID addresses (Figure 1).
5
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