Datasheet

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General Description

The MAX7356/MAX7357/MAX7358 8-channel I

switches/multiplexers expand the main I

C bus to any

combination of 8 extended I

C buses. They enable a

master on the main bus to isolate and communicate

with devices or groups of devices that may otherwise

have slave address conflicts. Any extended bus can be

connected or disconnected by control packets from the

main I

C bus writing to the main control register of

these I

C switches.

The MAX7357 and MAX7358 feature an enhanced

mode that includes a built-in timer used to monitor all

extended buses for lock-up conditions. If the clock or

data line of any of these buses is low for more than

25ms (typ), a lock condition is detected. An optional

interrupt can be generated through the bidirectional

RST/INT. The master can read the bus lock-up register

to find out which extended bus is locked up. The mas-

ter can also enable the MAX7357 or the MAX7358 to

send a “flush-out” sequence on the faulty channel.

There is an optional preconnection check that

can be enabled to toggle the extended bus clock and

data line low then high to ensure the downstream bus is

not locked high prior to connecting it to the host bus.

The MAX7356/MAX7357/MAX7358 are transparent

to signals sent and received at each channel, allowing

multiple masters. Any device connected to an I

bus can transmit and receive signals; however, only the

master connected to the host side of the MAX7356/

MAX7357/MAX7358 should address the device.

The MAX7356/MAX7357/MAX7358 are available in 24-pin

TSSOP and TQFN packages and are specified over the

extended -40°C to +85°C temperature range.

Applications

Features

o Bus Lock-Up Detection and Isolation (MAX7357,

MAX7358)

o Host Notification on Detection of Lock-Up

(MAX7357, MAX7358)

o Maintain Fault Diagnostic Information (MAX7357,

MAX7358)

o Dual-Function RST/INT Provides Lock-Up

Notification and Hardware Reset (MAX7357,

MAX7358)

o RST Input Resets I

C Interface (MAX7358)

o 3 Address Control Inputs

o Low R

Switches

o Logic-Level Translation

o Low 0.1µA (typ) Standby Current

o Support Hot Insertion

o 100kbps Standard-Mode or 400kbps Fast-Mode

C Interface

o Address Translation Allows Multiple Device with

Same ID

o 5.5V-Tolerant Inputs

o 2.3V to 5.5V Supply

MAX7356/MAX7357/MAX7358

1-to-8 I

C Bus Switches/Multiplexers with Bus

Lock-Up Detection, Isolation, and Notification

________________________________________________________________

Maxim Integrated Products

19-4207; Rev 0; 9/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT AVAILABLE

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX7356ETG+ -40°C to +85°C 24 TQFN-EP*

MAX7356EUG+** -40°C to +85°C 24 TSSOP

MAX7357ETG+ -40°C to +85°C 24 TQFN-EP*

MAX7357EUG+** -40°C to +85°C 24 TSSOP

MAX7358ETG+ -40°C to +85°C 24 TQFN-EP*

MAX7358EUG+** -40°C to +85°C 24 TSSOP

Denotes a lead-free/RoHS-compliant package.

EP = Exposed pad.

Future product—contact factory for availability.

Typical Operating Circuit and Pin Configurations appear at end of data sheet.

PART

ENHANCED

MODE

PRECONNECTION

WIGGLE TEST

POWER-UP

STATE

RST/INT

BIDIRECTIONAL

MAX7356 No No Basic mode RST only

MAX7357 Yes Yes, enhanced mode only Enhanced mode Yes

MAX7358 Yes Yes, enhanced mode only Basic mode Yes

Selector Guide

Servers

RAID

Base Stations

Control and Automation Devices

SFP Control Interface

Networking Equipment

Summary of content (22 pages)

PAGE 1
9-4207; Rev 0; 9/08 ILABLE N KIT AVA IO T A U L A V E 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification I 2C The MAX7356/MAX7357/MAX7358 8-channel switches/multiplexers expand the main I2C bus to any combination of 8 extended I2C buses. They enable a master on the main bus to isolate and communicate with devices or groups of devices that may otherwise have slave address conflicts.
PAGE 2
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) VDD .................................................................. -0.3V to +6.0V All Other Pins.....................................................-0.3V to +6.0V Input Currents VDD ...............................................................................100mA GND ...............................................................
PAGE 3
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification (VDD = +2.3V to +3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +3.3V, TA = +25°C.) (Notes 2–5) PARAMETER SYMBOL CONDITIONS MIN TYP MAX VDD = 3.0V to 3.6V, VO = 0.4V, IO = 15mA 5 11 30 VDD = 2.3V to 2.7V, VO = 0.4V, IO = 10mA 7 16 55 UNITS PASS GATE Switch Resistance RON VSWin = VDD = 3.
PAGE 4
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification ELECTRICAL CHARACTERISTICS (5V SUPPLY) (continued) (VDD = +4.5V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +5V, TA = +25°C.) (Notes 2–5) PARAMETER Input Capacitance SYMBOL CI CONDITIONS MIN VI = GND TYP MAX 2 UNITS pF PASS GATE Switch Resistance Switch Output Voltage Leakage Current Input/Output Capacitance RON VSW IL VDD = 4.5V to 5.
PAGE 5
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification (VDD = 2.3V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.) (Notes 2, 6) PARAMETER SYMBOL Data Valid Time tVD;DAT Data Valid Acknowledge tVD:ACK Low-Level Reset Time tWL(rst) Reset Time Recovery to Start CONDITIONS MIN TYP MAX (High to low) 1 (Low to high) 0.6 1 5 UNITS µs µs ns trst 500 ns tREC;STA 0 ns TIMING CHARACTERISTICS (FAST-MODE) (Figures 1, 2, 3) (VDD = 2.3V to 5.
PAGE 6
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification TIMING CHARACTERISTICS (FAST-MODE) (Figures 1, 2, 3) (continued) (VDD = 2.3V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.) (Notes 2, 6) Note 2: All devices are 100% production tested at TA = +25°C. Specifications are over -40°C to +85°C and are guaranteed by design. Note 3: Subscript SW refers to all SC_ and SD_ pins.
PAGE 7
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification tSU;STA BIT 7 MSB (A7) tLOW BIT 6 (A6) BIT 0 (R/W) MAX7356/MAX7357/MAX7358 START CONDITION (S) PROTOCOL STOP CONDITION (P) ACKNOWLEDGE (A) tHIGH 1/fSCL SCL tBUF tr tf SDA tHD;STA tHD;DAT tSU;DAT tVD;DAT tVD;ACK tSU;STO Figure 3. I2C Bus Timing Diagram DEVICE VSW + VSWin ISWout - Figure 4.
PAGE 8
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification MAX7356/MAX7357/MAX7358 Pin Description PIN NAME FUNCTION TQFN TSSOP 1 4 SD0 I2C Bus0 Serial Data 2 5 SC0 I2C Bus0 Serial Clock 3 6 SD1 I2C Bus1 Serial Data 4 7 SC1 I2C Bus1 Serial Clock 5 8 SD2 I2C Bus2 Serial Data 6 9 SC2 I2C Bus2 Serial Clock 7 10 SD3 I2C Bus3 Serial Data 8 11 SC3 I2C Bus3 Serial Clock 9 12 GND Supply Ground 10 13 SD4 I2C Bus4 Serial Data 11 14 SC4
PAGE 9
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification SC0 SC1 SC2 SC3 SC6 SC7 SD0 SD1 SD2 SD3 SD6 SD7 SWITCH ENABLE/DISABLE LOCK-UP DETECTION AND WIGGLE TEST REGISTER BANK WITH SWITCH CONTROL LOGIC VDD SCL SDA POWER-ON RESET GLITCH FILTER I2C BUS CONTROL A0 A1 A2 RST (RST/INT) INT LOGIC GND ( ) ONLY FOR THE MAX7357 AND MAX7358 _______________________________________________________________________________________ 9 MAX7356/MAX7357/MAX7358 Functional Di
PAGE 10
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification Detailed Description Enhanced Mode of Operation (MAX7357/MAX7358) The MAX7356/MAX7357/MAX7358 devices are 1-to-8 I2C multiplexers/switches for connecting a large number of I2C components to a single master. The circuits connect a main I2C bus to any combination of 8 extended I2C buses.
PAGE 11
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification Preconnection Wiggle Test (Stuck High Fault) (MAX7357/MAX7358) SDA Stuck Low If either line of any downstream bus is low for a period exceeding 25ms between t1 and t2 in Figure 6, the MAX7357/MAX7358 detect a lock-up fault on that bus and takes the action configured by the user. If the lockup is not on the main bus, SDA and SCL return to the high state at the same time.
PAGE 12
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification Register Map (MAX7357/MAX7358) PIN-SELECTABLE BITS A6 A5 A4 A3 A2 A1 The MAX7357 and MAX7358 have 7 registers (shown in Table 2) that can be accessed through the I2C bus. The MAX7357 powers up with all of these registers accessible. The initial register address counter is at 0x00. The MAX7358 powers up in basic mode with only the switch control register available.
PAGE 13
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification B7 B6 B5 B4 B3 B2 B1 B0 COMMAND X X X X X X X 0 X X X X X X X 1 Channel 0 enabled X X X X X X 0 X Channel 1 disabled X X X X X X 1 X Channel 1 enabled X X X X X 0 X X Channel 2 disabled X X X X X 1 X X Channel 2 enabled X X X X 0 X X X Channel 3 disabled X X X X 1 X X X Channel 3 enabled X X X 0 X X X X Channel 4 disabled X X
PAGE 14
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification Table 5. Configuration Register Definition B7 B6 B5 B4 B3 B2 B1 B0 COMMAND X X X X X X X 0 X X X X X X X 1 Interrupt with RST/INT enabled X X X X X X 0 X Flush-out disabled X X X X X X 1 X Flush-out enabled X X X X X 0 X X RST/INT released after a register read X X X X X 1 X X RST/INT released after 1.
PAGE 15
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification B7 B6 B5 B4 B3 B2 B1 B0 COMMAND X X X X X X X 0 Channel 0 no lock-up X X X X X X X 1 Channel 0 lock-up X X X X X X 0 X Channel 1 no lock-up X X X X X X 1 X Channel 1 lock-up X X X X X 0 X X Channel 2 no lock-up X X X X X 1 X X Channel 2 lock-up X X X X 0 X X X Channel 3 no lock-up X X X X 1 X X X Channel 3 lock-up X X X 0 X X X X
PAGE 16
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification Table 7. A Traffic Prior to Lock-Up Register Contents Example ADDRESS B7 B6 B5 B4 B3 B2 B1 B0 NOTE 0x04 0 1 1 0 1 0 0 0 Write to the troubled device address 0x05 0 1 1 0 0 0 0 0 The first data byte with trailing 0’s due to lock-up Table 8.
PAGE 17
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification S 0 1 1 0 1 0 START 0 0 LOCK-UP OCCURS A 0 1 W 1 0 L L FIRST DATA BYTE L L L L L L L L L L L L L SECOND DATA BYTE Figure 10. Bus Lock-Up During a 3-Byte Write Command SDA SCL S P START CONDITION STOP CONDITION Figure 11.
PAGE 18
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification edge bit because the device is the recipient. When the MAX7356/MAX7357/MAX7358 are transmitting to the master, the master generates the acknowledge bit because the master is the recipient. A multibyte read from the MAX7357 or MAX7358 returns contents of all 7 registers in sequence and repeats. The internal register address count always begins with the switch control register, 0x00.
PAGE 19
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification A read from the MAX7356 starts with the master transmitting the slave address with the R/W bit set high. The MAX7356 acknowledges the slave address. The master can read 1 byte from the switch control register and then issue a STOP condition (Figure 17). If the master reads more than one byte, the master upon reception acknowledges each byte. All bytes return the contents of the switch control register.
PAGE 20
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification ACKNOWLEDGE FROM THE MAX7357 OR MAX7358 S ADDRESS OF MUX/SWT PART START 0 ACKNOWLEDGE FROM THE MAX7357 OR MAX7358 A D7 D6 R/W D5 D4 D3 D2 D1 D0 ACKNOWLEDGE FROM THE MAX7357 OR MAX7358 A D7 D6 DATA BYTE TO THE SWITCH CONTROL REGISTER D5 D4 D3 D2 D1 D0 A P STOP DATA BYTE TO THE SWITCH CONTROL REGISTER Figure 17.
PAGE 21
1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification VCC VDD VDD VDD SD0 SDA SDA SCL RST INT SC0 SCL VDD RST(RST/INT) MAX7356 MAX7357 MAX7358 MASTER SD1 SC1 VDD A0 A1 A2 SD7 GND SC7 ( ) ONLY FOR THE MAX7357 AND MAX7358 RST (RST/INT) 3 22 SCL MAX7356 MAX7357 MAX7358 TOP VIEW 21 A2 SD0 1 SC0 5 20 SC7 SC0 2 SD1 6 19 SD7 SD1 3 SC1 7 18 SC6 SD2 8 17 SD6 SC2 9 16 SC5 SD3 10 15 SD5 SC3 11 14 SC4 GND 12 13 SD4 SD0 4 SCL 23 SDA S
PAGE 22
MAX7356/MAX7357/MAX7358 1-to-8 I2C Bus Switches/Multiplexers with Bus Lock-Up Detection, Isolation, and Notification Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 24 TSSOP U24+1 21-0066 24 TQFN-EP T2444+4 21-0139 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.