MAX7325ATG Maxim Integrated, MAX7325ATG Datasheet

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MAX7325ATG

Manufacturer Part Number
MAX7325ATG
Description
Interface - I/O Expanders
Manufacturer
Maxim Integrated
Series
MAX7325r
Datasheet

Specifications of MAX7325ATG

Maximum Operating Frequency
400 KHz
Operating Supply Voltage
1.71 V to 5.5 V
Operating Temperature Range
- 40 C to + 125 C
Package / Case
TQFN-24 EP
Power Dissipation
761.9 mW

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The MAX7325 2-wire serial-interfaced peripheral features
16 I/O ports. Ports are divided into eight push-pull out-
puts and eight I/Os with selectable internal pullups and
transition detection. Eight ports are push-pull outputs
and eight I/Os may be used as a logic input or an open-
drain output. Ports are overvoltage protected to +6V.
All I/O ports configured as inputs are continuously mon-
itored for state changes (transition detection). State
changes are indicated by the INT output. The interrupt
is latched, allowing detection of transient changes.
When the MAX7325 is subsequently accessed through
the serial interface, any pending interrupt is cleared.
The open-drain outputs are rated to sink 20mA, and are
capable of driving LEDs. The RST input clears the serial
interface, terminating any I
the MAX7325.
The MAX7325 uses two address inputs with four-level
logic to allow 16 I
address also determines the power-up logic state for
the I/O ports, and enables or disables internal 40kΩ
pullups in groups of four ports.
The MAX7325 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 MAX7325 is available in 24-pin QSOP and TQFN
packages and is specified over the -40°C to +125°C
automotive temperature range.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
Pin Configurations continued at end of data sheet.
TOP VIEW
Cell Phones
SAN/NAS
Servers
SCL
SDA
AD2
RST
INT
V+
19
20
21
22
23
24
+
18
TQFN (4mm x 4mm)
1
2
C slave addresses. The slave
17
2
EXPOSED PADDLE
General Description
MAX7325
16
Pin Configurations
3
2
C communication to or from
15
4
Notebooks
Satellite Radio
Automotive
14
I
5
2
13
6
Applications
C Port Expander with 8 Push-Pull
12
11
10
9
8
7
O10
O9
O8
GND
P7
P6
o 400kHz I
o +1.71V to +5.5V Operation
o 8 Push-Pull Outputs
o 8 Open-Drain I/O Ports, Rated to 20mA Sink
o I/O Ports are Overvoltage Protected to +6V
o Selectable I/O Port Power-Up Default Logic States
o Transient Changes are Latched, Allowing
o INT Output Alerts Change on Inputs
o AD0 and AD2 Inputs Select from 16 Slave
o Low 0.6µA (typ) Standby Current
o -40°C to +125°C Temperature Range
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed paddle.
/V Denotes an automotive qualified part.
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
MAX7324
MAX7325
MAX7326
MAX7327
MAX7325AEG+
MAX7325AEG/V+
MAX7325ATG+
PART
Current
Detection Between Read Operations
Addresses
and 8 Open-Drain I/Os
PART
INPUTS
Up to 8
Up to 4
2
C Serial Interface
8
4
INTERRUPT
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
Ordering Information
MASK
Yes
Yes
EVALUATION KIT AVAILABLE
Selector Guide
MAX7325
OUTPUTS
Up to 8
Up to 4
OPEN-
DRAIN
PIN-PACKAGE
24 QSOP
24 QSOP
24 TQFN-EP*
(4mm x 4mm)
19-3807; Rev 1; 9/12
Features
PUSH-PULL
OUTPUTS
12
12
8
8

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MAX7325ATG Summary of contents

Page 1

... INT Output Alerts Change on Inputs o AD0 and AD2 Inputs Select from 16 Slave Addresses o Low 0.6µA (typ) Standby Current o -40°C to +125°C Temperature Range PART MAX7325AEG+ MAX7325AEG/V+ MAX7325ATG+ + Denotes a lead(Pb)-free/RoHS-compliant package Exposed paddle. /V Denotes an automotive qualified part. PART INPUTS MAX7324 MAX7325 ...

Page 2

... V+ -0 110 110 130 130 140 140 250 360 260 100 360 120 130 25 40 MAX UNITS 5.50 V 1.6 V 1.9 µA 55 µ +0.2 µA pF 180 230 210 260 mV 230 280 250 300 mV 250 mV 250 mV 55 kΩ Maxim Integrated ...

Page 3

... SCL’s falling edge. Note 3: Guaranteed by design. Note total capacitance of one bus line in pF Note 5: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns. Maxim Integrated 2 C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os SYMBOL CONDITIONS ≤ ...

Page 4

... TEMPERATURE (°C) OUTPUT VOLTAGE HIGH vs. TEMPERATURE +5. 10mA SOURCE +3. 5mA 4 SOURCE +2. 5mA SOURCE V+ = +1.71V I = 2mA 2 SOURCE 1 0 -40 -25 - 110 125 TEMPERATURE (°C) Pin Description FUNCTION Maxim Integrated ...

Page 5

... MAX7324 8 101xxxx and 110xxxx MAX7325 Maxim Integrated 2 C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os The MAX7325 is set to two (see Tables 2 and 3) using the address select inputs AD0 and AD2, and is accessed over an I face up to 400kHz. The eight outputs and eight I/Os have different slave addresses ...

Page 6

... I/O versions: 8 open-drain I/O ports with latching transition detection interrupt and selectable pullups. 4 input-only, 4 output-only versions: 4 input ports with programmable latching transition detection interrupt and selectable pullups. 4 push-pull outputs with selectable power-up default levels. Maxim Integrated ...

Page 7

... AD0 and AD2 (Tables 2 and 3). For I/O ports used as inputs, ensure that the default states are logic-high so that the I/O ports power up in the high- impedance state. All I/O ports configured with pullups enabled also have a logic-high power-up state. Maxim Integrated 2 C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os INPUT ...

Page 8

... — — — — — — — — — — — — Maxim Integrated ...

Page 9

... I/O Port Input Transition Detection All I/O ports configured as inputs are monitored for changes since the expander was last accessed through the serial interface. The state of the ports is stored in an Maxim Integrated 2 C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os A3 ...

Page 10

... The data on SDA must remain stable while SCL is high (Figure 3). t SU,STA t HD,DAT t F REPEATED START CONDITION SDA SCL P STOP CONDITION Figure 3. Bit Transfer START and STOP Conditions t BUF t HD,STA t SU,STO STOP CONDITION DATA LINE STABLE; CHANGE OF DATA DATA VALID ALLOWED Bit Transfer START CONDITION Maxim Integrated ...

Page 11

... S Figure 4. Acknowledge SDA A5 MSB SCL Figure 5. Slave Address Maxim Integrated 2 C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os Acknowledge address are always 1, 1, and 0 (P0–P7 and 1 (O8 to O15). Connect AD0 and AD2 to GND SCL to select the slave address bits A3, A2, A1, and A0 ...

Page 12

... MAX7325 SLAVE ADDRESS R/W PORT SNAPSHOT Reading the MAX7325 PORT I PORT SNAPSHOT t PSU INT REMAINS HIGH UNTIL STOP CONDITION S = START CONDITION SHADED = SLAVE TRANSMISSION P = STOP CONDITION N = NOT ACKNOWLEDGE ACKNOWLEDGE FROM MASTER Maxim Integrated ...

Page 13

... Figure 7. Reading Open-Drain Ports of the MAX7325 (2 Data Bytes) ACKNOWLEDGE FROM MAX7325 MAX7325 SLAVE ADDRESS S SCL Figure 8. Reading Push-Pull Ports of MAX7325 Maxim Integrated 2 C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os A read from the push-pull ports of the MAX7325 starts with the master transmitting the group’s slave address with the R/W bit set high ...

Page 14

... DATA TO INTERRUPT MASK 0 A DATA 1 R/W ACKNOWLEDGE FROM SLAVE 2 C interface and/or some Port Output Signal-Level Translation DATA TO INTERRUPT MASK A DATA 2 ACKNOWLEDGE FROM SLAVE DATA 1 VALID ACKNOWLEDGE FROM SLAVE DATA 2 VALID Maxim Integrated ...

Page 15

... V is the supply voltage used to drive the LED SUPPLY (V MAX7325 OUTPUT GND GND Figure 10. MAX7325 Push-Pull Output Port Structure Maxim Integrated 2 C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os V LED V OL sinking I I LED For example, to operate a 2.2V red LED at 10mA from a ...

Page 16

... O15 RST O14 INT O13 O12 O11 O10 INPUT/OUTPUT P6 INPUT/OUTPUT P5 INPUT/OUTPUT P4 INPUT/OUTPUT P3 INPUT/OUTPUT P2 INPUT/OUTPUT AD0 P1 INPUT/OUTPUT AD2 P0 INPUT/OUTPUT GND Chip Information Package Information PACKAGE OUTLINE NO. PATTERN NO. CODE 90-0172 E24+1 21-0055 90-0022 T2444+4 21-0139 Maxim Integrated OUTPUT OUTPUT OUTPUT OUTPUT LAND ...

Page 17

... Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed ...

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