MAXIM MAX7320 User Manual
19-3879; Rev 0; 10/05
EVALUATION KIT
AVAILABLE
I2C Port Expander with Eight Push-Pull Outputs
General Description
The MAX7320 2-wire serial-interfaced peripheral features eight push-pull outputs with selectable power-up
logic states.
The +5.5V tolerant RST input clears the serial interface,
terminating any I2C†communication to or from the
MAX7320.
The MAX7320 uses two address inputs with four-level
logic to allow 16 I2C 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 interface 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).
Applications
Cell Phones/PDAs
Satellite Radios
Notebooks
Automotive
RAID
Servers
Features
♦ 400kHz, +5.5V-Tolerant I2C Serial Interface
♦ +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
Ordering Information
PART
MAX7320AEE+
MAX7320ATE+
+Denotes lead-free package.
TEMP
RANGE
-40°C to
+125°C
-40°C to
+125°C
PINPACKAGE
16 QSOP — E16-4
16 TQFN
3mm x 3mm
x 0.8mm
TOP
MARK
ADB T1633-4
PKG
CODE
MAX7320
Pin Configurations, Typical Application Circuit, and
Functional Diagram appear at end of data sheet.
Selector Guide
PART INPUTS INTERRUPT MASK OPEN-DRAIN OUTPUTS PUSH-PULL OUTPUTS
MAX7319 8 Yes — —
MAX7320 — — — 8
MAX7321 Up to 8 — Up to 8 —
MAX7322 4 Yes — 4
MAX7323 Up to 4 — Up to 4 4
MAX7328* — —
MAX7329**
*Second source to PCF8574.
**Second source to PCF8574A.
†
a
P
C
l
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.
Up to 8
—
Up to 8
—
MAX7320
I2C Port Expander with Eight Push-Pull Outputs
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.
(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
ELECTRICAL CHARACTERISTICS
(V+ = +1.71V to +5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage V+ 1.71 5.50 V
Power-On Reset Voltage V
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
Output Low Voltage
O0–O7
Output High Voltage
O0–O7
Output Low Voltage SDA V
POR
I
STB
V
V
I
IH
V
V
OLSDAISINK
SCL and SDA and other digital inputs at V+ 0.6 1.5 µA
I+ f
OL
OH
SCL
V+ < 1.8V 0.8 x V+
IH
V+ ≥ 1.8V 0.7 x V+
V+ < 1.8V 0.2 x V+
IL
V+ ≥ 1.8V 0.3 x V+
SDA, SCL, AD0, AD2, RST, O0–O7 at V+ or
, I
IL
GND
V+ = +1.71V, I
V+ = +2.5V, I
V+ = +3.3V, I
V+ = +5V, I
V+ = +1.71V, I
V+ = +2.5V, I
V+ = +3.3V, I
V+ = +5V, I
= 400kHz; other digital inputs at V+ 23 55 µA
-0.2 +0.2 µA
10 pF
= 1mA 120 240
SINK
= 2mA 140 280
SINK
= 3mA 170 310
SINK
= 5mA 220 380
SINK
SOURCE
SOURCE
SOURCE
SOURCE
= 6mA 250 mV
= 1mA V+ - 250 V+ - 130
= 2mA V+ - 350 V+ - 200
= 3mA V+ - 290 V+ - 150
= 5mA V+ - 380 V+ - 230
1.6 V
V
V
mV
mV
MAX7320
I2C Port Expander with Eight Push-Pull Outputs
_______________________________________________________________________________________ 3
PORT AND TIMING CHARACTERISTICS
(V+ = +1.71V to +5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA= +25°C.) (Note 1)
TIMING CHARACTERISTICS
(V+ = +1.71V to +5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA= +25°C.) (Note 1)
Note 1: All parameters tested at TA= +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. tRand tFmeasured 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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Port Output Data Valid t
PPV
CL ≤ 100pF 4 µs
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Serial Clock Frequency f
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 t
SCL Clock Low Period t
SCL Clock High Period t
Rise Time of Both SDA and SCL
Signals, Receiving
Fall Time of Both SDA and SCL
Signals, Receiving
Fall Time of SDA Transmitting t
Pulse Width of Spike Suppressed
Capacitive Load for Each Bus
Line
RST Pulse Width t
RST Rising to START Condition
Setup Time
t
HD, STA
t
SU, STA
t
SU, STO
t
HD, DAT
t
SU, DAT
VD, DAT
SCL
t
BUF
LOW
HIGH
t
R
t
F
F,TX
t
SP
C
b
W
t
RST
1.3 µs
0.6 µs
0.6 µs
0.6 µs
(Note 3) 0.9 µs
100 ns
SCL low to SDA output valid 3.4 µs
1.3 µs
0.7 µs
(Notes 2, 4)
(Notes 2, 4)
(Notes 2, 4)
(Note 5) 50 ns
(Note 2) 400 pF
500 ns
20 +
0.1C
20 +
0.1C
20 +
0.1C
1µs
400 kHz
300 ns
b
300 ns
b
250 ns
b
MAX7320
I2C Port Expander with Eight Push-Pull Outputs
4 _______________________________________________________________________________________
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
0
0.4
0.2
1.0
0.8
0.6
1.2
1.4
1.8
1.6
2.0
-40 -10 5-25 20 35 50 65 80 95 110 125
STANDBY CURRENT vs. TEMPERATURE
MAX7320 toc01
TEMPERATURE (°C)
STANDBY CURRENT (μA)
V+ = +3.3V
V+ = +2.5V
V+ = +5.0V
V+ = +1.71V
f
SCL
= 0kHz
0
20
10
40
30
50
60
-40 -10 5 20-25 35 50 65 80 95 110 125
SUPPLY CURRENT vs. TEMPERATURE
MAX7320 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
V+ = +3.3V
V+ = +1.71V
V+ = +2.5V
f
SCL
= 400kHz
V+ = +5.0V
OUTPUT VOLTAGE LOW
vs. TEMPERATURE
TEMPERATURE (°C)
OUTPUT VOLTAGE LOW (V)
MAX7320 toc03
-40 -25 -10 5 20 35 50 65 80 95 110 125
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
V+ = +3.3V
I
SINK
= 3mA
V+ = +5.0V
I
SINK
= 5mA
V+ = +2.5V
I
SINK
= 2mA
V+ = +1.71V
I
SINK
= 1mA
OUTPUT VOLTAGE HIGH
vs. TEMPERATURE
TEMPERATURE (°C)
OUTPUT VOLTAGE HIGH (V)
MAX7320 toc04
-40 -25 -10 5 20 35 50 65 80 95 110 125
0
1
2
3
4
5
6
V+ = +5.0V
I
SOURCE
= 5mA
V+ = +3.3V
I
SOURCE
= 3mA
V+ = +1.71V
I
SOURCE
= 1mA
V+ = +2.5V
I
SOURCE
= 2mA
Pin Description
PIN
QSOP TQFN
1, 3 15, 1 AD0, AD2
216 RST Reset Input, Active Low. Drive RST low to clear the 2-wire interface.
4–7, 9–12 2–5, 7–10 O0–O7 Output Ports. O0 to O7 are push-pull outputs.
8 6 GND Ground
13 11 N.C. No Connection. Not internally connected.
14 12 SCL I2C-Compatible Serial Clock Input
15 13 SDA I2C-Compatible Serial Data I/O
16 14 V+ Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic capacitor.
— EP EP Exposed Pad. Connect exposed pad to GND.
NAME 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).
Detailed Description
MAX7319–MAX7329 Family Comparison
The MAX7319–MAX7323 family consists of five pincompatible, eight-port expanders. Each version is optimized for different applications. The MAX7328 and
MAX7329 are second sources to the PCF8574 and
PCF8574A.
The MAX7324–MAX7327 family consists of four pincompatible, 16-port expanders that integrate the functions 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 I2C 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
I2C Port Expander with Eight Push-Pull Outputs
_______________________________________________________________________________________ 5
Table 1. MAX7319–MAX7329 Family Comparison
2
C
I
PART
8-PORT EXPANDERS
MAX7319 110xxxx 8 Yes — —
MAX7320 101xxxx — — — 8
MAX7321 110xxxx Up to 8 — Up to 8 —
MAX7322 110xxxx 4 Yes — 4
SLAVE
ADDRESS
INPUTS
INPUT
INTERRUPT
MASK
OPENDRAIN
OUTPUTS
PUSH-
PULL
OUTPUTS
APPLICATION
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 opendrain 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.
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