19-3879; Rev 0; 10/05
KIT
ATION
EVALU
E
BL
AVAILA
I
2
C Port Expander with Eight Push-Pull Outputs
General Description
The MAX7320 2-wire serial-interfaced peripheral fea-
tures eight push-pull outputs with selectable power-up
logic states.
The +5.5V tolerant
RST
input clears the serial interface,
terminating any I
2
C
†
communication to or from the
MAX7320.
The MAX7320 uses two address inputs with four-level
logic to allow 16 I
2
C slave addresses. The slave
address also determines the power-up state level for
the outputs in groups of four ports.
The MAX7320 supports hot insertion. The serial inter-
face SDA, SCL, AD0, AD2, and
RST
remain high
impedance in power-down (V+ = 0V) with up to +6V
asserted on them.
The MAX7320 is one device in a family of pin-compatible
port expanders with a choice of input ports, open-drain
I/O ports, and push-pull output ports (see Table 1).
The MAX7320 is available in 16-pin QSOP and 16-pin
TQFN packages, and is specified over the automotive
temperature range (-40°C to +125°C).
♦
+1.71V to +5.5V Operating Voltage
♦
Eight Push-Pull Output Ports with Selectable
Power-Up Logic States
♦
RST
Clears the Serial Interface, Terminating Any
Serial Transaction to or from the MAX7320
♦
AD0 and AD2 Inputs Select from 16 Slave
Addresses
♦
Low 0.6µA (typ) Standby Current
♦
-40°C to +125°C Temperature Range
Features
♦
400kHz, +5.5V-Tolerant I
2
C Serial Interface
MAX7320
Ordering Information
PART
MAX7320AEE+
TEMP
RANGE
-40°C to
+125°C
-40°C to
+125°C
PIN-
PACKAGE
16 QSOP
16 TQFN
3mm x 3mm
x 0.8mm
TOP
MARK
—
PKG
CODE
E16-4
Applications
Cell Phones/PDAs
Satellite Radios
Notebooks
Automotive
RAID
Servers
MAX7320ATE+
ADB
T1633-4
+Denotes
lead-free package.
Pin Configurations, Typical Application Circuit, and
Functional Diagram appear at end of data sheet.
Selector Guide
PART
MAX7319
MAX7320
MAX7321
MAX7322
MAX7323
MAX7328*
MAX7329**
INPUTS
8
—
Up to 8
4
Up to 4
Up to 8
INTERRUPT MASK
Yes
—
—
Yes
—
—
—
OPEN-DRAIN OUTPUTS
—
—
Up to 8
—
Up to 4
Up to 8
PUSH-PULL OUTPUTS
—
8
—
4
4
—
—
*Second
source to PCF8574.
**Second
source to PCF8574A.
†
Pa
lC
S.
________________________________________________________________
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.
I
2
C Port Expander with Eight Push-Pull Outputs
MAX7320
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
Supply Voltage V+....................................................-0.3V to +6V
SCL, SDA, AD0, AD2,
RST
.......................................-0.3V to +6V
O0–07...............................................................0.3V to V+ + 0.3V
00–07 Output Current .......................................................±25mA
SDA Input Current.............................................................. 10mA
Total V+ Current..................................................................50mA
Total GND Current ...........................................................100mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C over +70°C)..............667mW
16-Pin Thin QFN (derate 15.6mW/°C over +70°C) ....1250mW
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.
ELECTRICAL CHARACTERISTICS
(V+ = +1.71V 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
Operating Supply Voltage
Power-On Reset Voltage
Standby Current Voltage
(Interface Idle)
Supply Current
(Interface Running)
Input High-Voltage
SDA, SCL, AD0, AD2,
RST
Input Low-Voltage
SDA, SCL, AD0, AD2,
RST
Input Leakage Current
SDA, SCL, AD0, AD2,
RST
Input Capacitance
SDA, SCL, AD0, AD2,
RST
V+ = +1.71V, I
SINK
= 1mA
Output Low Voltage
O0–O7
V
OL
V+ = +2.5V, I
SINK
= 2mA
V+ = +3.3V, I
SINK
= 3mA
V+ = +5V, I
SINK
= 5mA
V+ = +1.71V, I
SOURCE
= 1mA
Output High Voltage
O0–O7
Output Low Voltage SDA
V
OH
V+ = +2.5V, I
SOURCE
= 2mA
V+ = +3.3V, I
SOURCE
= 3mA
V+ = +5V, I
SOURCE
= 5mA
V
OLSDA
I
SINK
= 6mA
SYMBOL
V+
V
POR
I
STB
I+
V
IH
V
IL
I
IH
, I
IL
SCL and SDA and other digital inputs at V+
f
SCL
= 400kHz; other digital inputs at V+
V+ < 1.8V
V+
≥
1.8V
V+ < 1.8V
V+
≥
1.8V
SDA, SCL, AD0, AD2,
RST,
O0–O7 at V+ or
GND
-0.2
10
120
140
170
220
V+ - 250 V+ - 130
V+ - 350 V+ - 200
V+ - 290 V+ - 150
V+ - 380 V+ - 230
250
mV
mV
240
280
310
380
mV
0.8 x V+
0.7 x V+
0.2 x V+
0.3 x V+
+0.2
0.6
23
CONDITIONS
MIN
1.71
TYP
MAX
5.50
1.6
1.5
55
UNITS
V
V
µA
µA
V
V
µA
pF
2
_______________________________________________________________________________________
I
2
C Port Expander with Eight Push-Pull Outputs
PORT AND TIMING CHARACTERISTICS
(V+ = +1.71V 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
Port Output Data Valid
SYMBOL
t
PPV
C
L
≤
100pF
CONDITIONS
MIN
TYP
MAX
4
UNITS
µs
MAX7320
TIMING CHARACTERISTICS
(V+ = +1.71V 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
Serial Clock Frequency
Bus Free Time Between a STOP
and a START Condition
Hold Time (Repeated) START
Condition
Repeated START Condition
Setup Time
STOP Condition Setup Time
Data Hold Time
Data Setup Time
SCL Low to Data Out Valid
SCL Clock Low Period
SCL Clock High Period
Rise Time of Both SDA and SCL
Signals, Receiving
Fall Time of Both SDA and SCL
Signals, Receiving
Fall Time of SDA Transmitting
Pulse Width of Spike Suppressed
Capacitive Load for Each Bus
Line
RST
Pulse Width
RST
Rising to START Condition
Setup Time
SYMBOL
f
SCL
t
BUF
t
HD, STA
t
SU, STA
t
SU, STO
t
HD, DAT
t
SU, DAT
t
VD, DAT
t
LOW
t
HIGH
t
R
t
F
t
F,TX
t
SP
C
b
t
W
t
RST
(Notes 2, 4)
(Notes 2, 4)
(Notes 2, 4)
(Note 5)
(Note 2)
500
1
SCL low to SDA output valid
1.3
0.7
20 +
0.1C
b
20 +
0.1C
b
20 +
0.1C
b
50
400
300
300
250
(Note 3)
100
3.4
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
µs
ns
ns
ns
ns
pF
ns
µs
Note 1:
All parameters tested at T
A
= +25°C. 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) 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 0.3 x V+ and 0.7 x V+, I
SINK
≤
6mA.
Note 5:
Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
_______________________________________________________________________________________
3
I
2
C Port Expander with Eight Push-Pull Outputs
MAX7320
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
STANDBY CURRENT vs. TEMPERATURE
MAX7320 toc01
SUPPLY CURRENT vs. TEMPERATURE
f
SCL
= 400kHz
50
SUPPLY CURRENT (μA)
40
30
20
10
V+ = +1.71V
0
V+ = +3.3V
V+ = +5.0V
MAX7320 toc02
MAX7320 toc04
2.0
1.8
STANDBY CURRENT (μA)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V+ = +2.5V
V+ = +3.3V
60
f
SCL
= 0kHz
V+ = +5.0V
V+ = +2.5V
V+ = +1.71V
-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)
OUTPUT VOLTAGE LOW
vs. TEMPERATURE
0.45
OUTPUT VOLTAGE LOW (V)
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
V+ = +1.71V
I
SINK
= 1mA
V+ = +5.0V
I
SINK
= 5mA
V+ = +3.3V
I
SINK
= 3mA
MAX7320 toc03
OUTPUT VOLTAGE HIGH
vs. TEMPERATURE
6
5
OUTPUT VOLTAGE HIGH (V)
4
3
2
1
0
V+ = +2.5V
I
SOURCE
= 2mA
V+ = +5.0V
I
SOURCE
= 5mA
V+ = +3.3V
I
SOURCE
= 3mA
0.50
V+ = +2.5V
I
SINK
= 2mA
V+ = +1.71V
I
SOURCE
= 1mA
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Pin Description
PIN
QSOP
1, 3
2
4–7, 9–12
8
13
14
15
16
—
TQFN
15, 1
16
2–5, 7–10
6
11
12
13
14
EP
NAME
AD0, AD2
RST
O0–O7
GND
N.C.
SCL
SDA
V+
EP
FUNCTION
Address Inputs. Select device slave address with AD0 and AD2. Connect AD0 and AD2
to either GND, V+, SCL, or SDA to give four logic combinations (see Table 3).
Reset Input, Active Low. Drive
RST
low to clear the 2-wire interface.
Output Ports. O0 to O7 are push-pull outputs.
Ground
No Connection. Not internally connected.
I
2
C-Compatible Serial Clock Input
I
2
C-Compatible Serial Data I/O
Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic capacitor.
Exposed Pad. Connect exposed pad to GND.
4
_______________________________________________________________________________________
I
2
C Port Expander with Eight Push-Pull Outputs
Detailed Description
MAX7319–MAX7329 Family Comparison
The MAX7319–MAX7323 family consists of five pin-
compatible, eight-port expanders. Each version is opti-
mized for different applications. The MAX7328 and
MAX7329 are second sources to the PCF8574 and
PCF8574A.
The MAX7324–MAX7327 family consists of four pin-
compatible, 16-port expanders that integrate the func-
tions of the MAX7320 and one of either the MAX7319,
MAX7321, MAX7322, or MAX7323.
Functional Overview
The MAX7320 is a general-purpose port expander
operating from a +1.71V to +5.5V supply that provides
eight push-pull output ports. The MAX7320 is rated to
sink a total of 100mA and source a total of 50mA from
all eight combined outputs.
The MAX7320 is set to one of 16 I
2
C slave addresses
(0x50 to 0x5F) using address select inputs AD0 and AD2,
and is accessed over an I
2
C serial interface up to
400kHz. Note the MAX7320 offers a different range of I
2
C
slave addresses than the MAX7319, MAX7321,
MAX7322, and MAX7323 (these expanders use the
address range 0x60 to 0x6F).
MAX7320
Table 1. MAX7319–MAX7329 Family Comparison
PART
I
2
C
SLAVE
INPUTS
ADDRESS
INPUT
INTERRUPT
MASK
OPEN-
DRAIN
OUTPUTS
PUSH-
PULL
OUTPUTS
APPLICATION
8-PORT EXPANDERS
Input-only versions:
Eight input ports with programmable latching
transition detection interrupt and selectable pullups.
Offers maximum versatility for automatic input
monitoring. An interrupt mask selects which inputs
cause an interrupt on transitions, and transition flags
identify which inputs have changed (even
momentarily) since the ports were last read.
Output-only versions:
Eight push-pull outputs with selectable power-up
default states.
Push-pull outputs offer faster rise time than open-
drain outputs, and require no pullup resistors.
I/O versions:
Eight open-drain I/O ports with latching transition
detection interrupt and selectable pullups.
Open-drain outputs can level shift the logic-high
state to a higher or lower voltage than V+ using
external pullup resistors. Any port can be used as an
input by setting the open-drain output to logic-high.
Transition flags identify which inputs have changed
(even momentarily) since the ports were last read.
Four input-only, four output-only versions:
Four input ports with programmable latching
transition detection interrupt and selectable pullups.
Four push-pull outputs with selectable power-up
default levels.
MAX7319
110xxxx
8
Yes
—
—
MAX7320
101xxxx
—
—
—
8
MAX7321
110xxxx
Up to 8
—
Up to 8
—
MAX7322
110xxxx
4
Yes
—
4
_______________________________________________________________________________________
5
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