MAXIMA MAX7317 User Manual

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General Description

The MAX7317 serial-interfaced peripheral provides
microprocessors with 10 I/O ports rated to 7V. Each
port can be individually configured as either an open­drain output, or an overvoltage-protected Schmitt input.

The MAX7317 supports hot insertion. All port pins
remain high impedance in power-down (V+ = 0V) with
up to 8V asserted on them.

The MAX7317 is available in 16-pin thin QFN and QSOP
packages and operates in the -40°C to +125°C range.

For a similar part with constant-current outputs and
8-bit PWM controls, refer to the MAX6966/MAX6967
data sheet.

Applications

Portable Equipment

Cellular Phones

White Goods

Industrial Controllers

Automotive

System Monitoring

Features

♦ High-Speed, 26MHz SPI™-/QSPI-™/MICROWIRE™-

Compatible Serial Interface

♦ 2.25V to 3.6V Operation

♦ I/O Port Inputs are Overvoltage Protected to 7V

♦ I/O Port Outputs are 7V-Rated Open Drain

♦ I/O Ports Support Hot Insertion

♦ 0.7µA (typ), 1.9µA (max) Standby Current

♦ Tiny 3mm x 3mm, 0.8mm High Thin QFN Package

♦ -40°C to +125°C Temperature Range

MAX7317

10-Port SPI-Interfaced I/O Expander with

Overvoltage and Hot-Insertion Protection

________________________________________________________________ Maxim Integrated Products 1

THIN QFN

MAX7317ATE

13

14

15

1234

5

6

16

12 11 10 9

8

7

V+

DIN

SCLK

P0

P1

P2

P3

P9

P8

P7

CS

P5

P6

GND

P4

DOUT

TOP VIEW

Pin Configurations

Ordering Information

Typical Application Circuit

19-3380; Rev 2; 4/05

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.

PART

TEMP

PIN­PACKAGE

TOP

PKG

CODE

MAX7317ATE

-40°C to

16 Thin QFN
3mm x 3mm x

0.8mm

T1633-4

MAX7317AEE

-40°C to
16 QSOP — —

Pin Configurations continued at end of data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

RANGE

+125°C

MARK

ACH

+3.3V

µC

MAX7317

SCLK

DIN

DOUT

CS

GND

P0
P1
P2
P3
P4
P5
P6
P7
P8
P9

SCLK

MOSI

MISO

CS

+125°C

I/O PORTS

MAX7317

10-Port SPI-Interfaced I/O Expander with
Overvoltage and Hot-Insertion Protection

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Typical Operating Circuit, V+ = 2.25V to 3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V+ = 3.3V, TA= +25°C.)

(Note 1)

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.

Voltage (with respect to GND)

V+ .............................................................................-0.3V to +4V

SCLK, DIN, CS, DOUT .................................-0.3V to (V+ + 0.3V)

P_ .............................................................................-0.3V to +8V

DC Current into P_ .............................................................24mA

DC Current into DOUT ........................................................10mA

Total GND Current ............................................................200mA

Continuous Power Dissipation (T

A

= +70°C)

16-Pin Thin QFN

(derate 14.7mW/°C above +70°C).........................1176mW

16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW

Operating Temperature Range

(T

MIN

to T

MAX

) ..............................................-40°C to +125°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

CONDITIONS

UNITS

Operating Supply Voltage V+

V

Output Load External Supply
Voltage P0–P9

V

EXT

7V

TA = +25°C

1.5

1.7

Standby Current
(Interface Idle)

I

STBY

All digital inputs at V+
or GND

1.9

µA

TA = +25°C

Supply Current I

+

f

SCLK

= 26MHz; other

digital inputs at V+ or

µA

Input High Voltage
(P0–P9, DIN, SCLK, CS)

V

IH

P0–P9 output register set to 0x01

V

Input Low Voltage
(P0–P9, DIN, SCLK, CS)

V

IL

P0–P9 output register set to 0x01

V

Input Leakage Current
(P0–P9, DIN, SCLK, CS)

I

IH

, I

IL

µA

Input Capacitance
(P0–P9, DIN, SCLK, CS

(Note 2) 10 pF

Output Low Voltage (P0–P9) V

OLP_

I

SINK

= 0.5mA, output register set to 0x00 0.4 V

Output Low Short-Circuit Current
(P0–P9)

V

OLPOUT

= 5V

20 mA

Output High Voltage (DOUT)

I

SOURCE

= -6mA V+ - 0.3V V

Output Low Voltage (DOUT)

I

SINK

= 6mA 0.3 V

Power-On Reset Voltage V

POR

2V

SYMBOL

MIN TYP MAX

2.25 3.60

T

A

T

A

T

GND; DOUT unloaded

V

OHDOUT

V

OLDOUT

A

T

A

to +85°C

= T

MIN

to T

= T

MIN

MAX

to +85°C 680

= T

MIN

to T

= T

MIN

MAX

0.7 x V+

-0.2 +0.2

0.70

385 620

730

0.3 x V+

10.8

MAX7317

10-Port SPI-Interfaced I/O Expander with

Overvoltage and Hot-Insertion Protection

_______________________________________________________________________________________ 3

Note 1: All parameters are tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.

TIMING CHARACTERISTICS

(Typical Operating Circuit, V+ = 2.25V to 3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V+ = 3.3V, TA= +25°C.)

(Note 1)

PARAMETER

CONDITIONS

UNITS

SCLK Clock Period t

CP

ns

SCLK Pulse-Width High t

CH

19 ns

SCLK Pulse-Width Low t

CL

19 ns

CS Fall to SCLK Rise Setup

t

CSS

ns

SCLK Rise to CS Rise Hold

t

CSH

ns

DIN Setup Time t

DS

ns

DIN Hold Time t

DH

ns

Output Data Propagation Delay

t

DO

19 ns

DOUT Output Rise and Fall
Times

t

FT

C

LOAD

= 20pF (Note 2) 10 ns

Minimum CS Pulse High t

CSW

ns

MAX7317 Block Diagram

SYMBOL

MIN TYP MAX

38.4

9.5

2.5

9.5

2.5

38.4

SCLK

CS

DIN

DOUT

MAX7317

I/O REGISTER

I/O PORTS

4-WIRE SERIAL INTERFACE

P0
P1
P2
P3
P4
P5
P6
P7
P8
P9

MAX7317

10-Port SPI-Interfaced I/O Expander with
Overvoltage and Hot-Insertion Protection

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

0

3

9

6

12

15

PORT SINK CURRENT

vs. PORT VOLTAGE

MAX7317 toc01

PORT VOLTAGE (V)

PORT SINK CURRENT (mA)

04268

TA = -40°C

TA = +25°C

TA = +85°C

TA = +125°C

0.4

0.6

0.5

0.8

0.7

0.9

1.0

-40 -10 5 20-25 35 50 65 80 95 110 125

STANDBY CURRENT

vs. TEMPERATURE

MAX7317 toc02

TEMPERATURE (°C)

STANDBY CURRENT (µA)

V+ = 3.6V

V+ = 3.3V

V+ = 2.7V

V+ = 2.25V

0

0.1

0.3

0.2

0.4

0.5

-40 -10 5 20-25 35 50 65 80 95 110 125

SUPPLY CURRENT (I+)

vs. TEMPERATURE

MAX7317 toc03

TEMPERATURE (°C)

STANDBY CURRENT (mA)

V+ = 3.6V

V+ = 3.3V

V+ = 2.7V

V+ = 2.25V

PIN

QSOP

QFN

NAME FUNCTION

115SCLK

Serial-Clock Input. On SCLK’s rising edge, data shifts into the internal shift register. On
SCLK’s falling edge, data is clocked out of DOUT. SCLK is active only while CS is low.

216CS

Chip-Select Input. Serial data is loaded into the shift register while CS is low. The most recent
16 bits of data latch on CS’s rising edge.

3–7, 9–13

P0–P9

I/O Ports. P0 to P9 can be configured as open-drain, current-sink outputs rated at 20mA
maximum, or as CMOS inputs, or as open-drain outputs. Loads should be connected to a
supply voltage no higher than 7V.

86GND Ground

14 12 DOUT

Serial-Data Output. The data into DIN is valid at DOUT 15.5 clock cycles later. Use this pin to
daisy-chain several devices or allow data readback. Output is push-pull.

15 13 DIN

Serial-Data Input. Data from DIN loads into the internal 16-bit shift register on SCLK’s rising
edge.

16 14 V+ Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic capacitor.

— PAD

Exposed

pad

Exposed Pad on Package Underside. Connect to GND.

Pin Description

1–5, 7–11