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MAX4359EAX+中文资料

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General Description

The MAX4359/MAX4360/MAX4456 low-cost video cross-point switches are designed to reduce component count,board space, design time, and system cost. Each con-tains a matrix of T-switches that connect any of their four (MAX4359) or eight (MAX4360/MAX4456) video inputs to any of their buffered outputs, in any combination. Each matrix output is buffered by an internal, high-speed (250V/μs), unity-gain amplifier that is capable of driving 400?and 20pF at 2.6V P-P . For applications requiring increased drive capability, buffer the MAX4359/MAX4360/MAX4456 outputs with the MAX4395 quad,operational amplifier.

The MAX4456 has a digitally controlled 8x8 switch matrix and is a low-cost pin-for-pin compatible alternative to the popular MAX456. The MAX4359/MAX4360 are similar to the MAX4456, with the 8x8 switch matrix replaced by a 4x4 (MAX4359) or an 8x4 (MAX4360) switch matrix.

Three-state output capability and internal, programmable active loads make it feasible to parallel multiple devices to form larger switch arrays. The inputs and outputs are on opposite sides, and a quiet power supply or digital input line separates each channel, which reduces crosstalk to -70dB at 5MHz. For applications demanding better DC specifications, see the MAX456 8x8 video crosspoint switch.

________________________Applications

Features

?Eight (MAX4456) or Four (MAX4359/MAX4360)Internal Buffers

250V/μs Slew Rate

Three-State Output Capability Power-Saving Disable Feature 65MHz -3dB Bandwidth

?Routes Any Input Channel to Any Output Channel ?Serial or Parallel Digital Interface

?Expandable for Larger Switch Matrices ?80dB All-Channel Off-Isolation at 5MHz ?70dB Single-Channel Crosstalk

?Straight-Through Pinouts Simplify Layout ?Low-Cost Pin-Compatible Alternative to MAX456 (MAX4456)

MAX4359/MAX4360/MAX4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches

_________________________________________________Typical Application Circuits

19-1389; Rev 2; 2/07

High-Speed Signal Routing

Video-On-Demand Systems

Video Test Equipment Video Conferencing Security Systems

M A X 4359/M A X 4360/M A X 4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches 2_______________________________________________________________________________________

DC ELECTRICAL CHARACTERISTICS

(V+ = +5V, V- = -5V, V LOAD = +5V (internal load resistors on), V IN_= V AGND = V DGND = 0V, T A = T MIN to T MAX , unless otherwise noted.Typical values are at T A = +25°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.

Total Supply Voltage (V+ to V-)...........................................+12V Positive Supply Voltage (V+) Referred to AGND.......-0.3V to +12V Negative Supply Voltage (V-) Referred to AGND ......-12V to +0.3V DGND to AGND..................................................................±0.3V Buffer Short Circuit to Ground when

Not Exceeding Package Power Dissipation.............Indefinite Analog Input Voltage............................(V+ + 0.3V) to (V- - 0.3V)Digital Input Voltage.............................(V+ + 0.3V) to (V- - 0.3V)Input Current, Power On or Off

Digital Inputs.................................................................±20mA Analog Inputs...............................................................±50mA

Continuous Power Dissipation (T A = +70°C)

36-Pin SSOP (derate 11.8mW/°C above +70°C)...........941mW 24-Pin SO (derate 11.8mW/°C above +70°C)................941mW 40-Pin Plastic DIP (derate 11.3mW/°C above +70°C)....889mW 44-Pin PLCC (derate 13.3mW/°C above +70°C).......1066mW Operating Temperature Ranges

MAX4456C _ _....................................................0°C to +70°C MAX4_ _ _E_ _.................................................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C

ABSOLUTE MAXIMUM RATINGS

MAX4359/MAX4360/MAX4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches

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Note 1:See Dynamic Test Circuits section.

Note 2:3dB typical crosstalk improvement when R S = 0.

Note 3:Input test signal: 3.58MHz sine wave of amplitude 40IRE superimposed on a linear ramp (0 to 100IRE). IRE is a unit of

video-signal amplitude developed by the International Radio Engineers. 140IRE = 1.0V.

Note 4:Guaranteed by design.

PARAMETER

Latch Delay

SYMBOL MIN TYP MAX

t D 80

UNITS ns Switch Break-Before-Make Delay t ON - t OFF 15ns LATCH Edge to Switch Off t OFF 35ns LATCH Edge to Switch On

t ON

Write Pulse Width Low t WL 80ns Chip-Enable to Write Setup t CE 0ns Write Pulse Width High t WH 80ns 240Data Hold t DH 0ns Latch Pulse Width t L 80ns CONDITIONS

LATCH on Parallel mode Serial mode

Data Setup t DS 160ns SWITCHING CHARACTERISTICS

(Figure 4, V+ = +5V, V- = -5V, V LOAD = +5V (internal load resistors on), V IN_= V AGND = V DGND = 0V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 4)

AC ELECTRICAL CHARACTERISTICS

(V+ = +5V, V- = -5V, V = +5V (internal load resistors on), V = V = 0V, T = +25°C, unless otherwise noted.)

M A X 4359/M A X 4360/M A X 4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches 4_______________________________________________________________________________________

Pin Description

Pin Description (continued)

MAX4359/MAX4360/MAX4456Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches

M A X 4359/M A X 4360/M A X 4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches 6

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Detailed Description

Output Buffers

The MAX4456 video crosspoint switch consists of 64 T-switches in an 8x8 grid (Figure 1). The eight matrix outputs are followed by eight wideband buffers opti-mized for driving 400?and 20pF loads. The MAX4359’s core is a 4x4 switch matrix with each of its outputs followed by a wideband buffer. The MAX4360has an 8x4 matrix and four output buffers. Each buffer has an internal active load on the output that can be readily shut off through the LOAD input (off when LOAD = 0V). The shut-off is useful when two or more cross-points are connected in parallel to create more input channels. With more input channels, only one set of

buffers can be active and only one set of loads can be driven. When active, the buffer must have either 1) an internal load, 2) the internal load of another buffer in another MAX4359/MAX4360/MAX4456, or 3) an exter-nal load.

Each output can be disabled under logic control. When a buffer is disabled, its output enters a high-impedance state. I n multichip parallel applications, the disable function prevents inactive outputs from loading lines driven by other devices. Disabling the inactive buffers reduces power consumption.

The outputs connect easily to MAX4395 quad, opera-tional amplifiers when back-terminated 75?coaxial cable must be driven.

Figure 1. MAX4456 Functional Diagram

MAX4359/MAX4360/MAX4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches

Power-On RESET

The MAX4359/MAX4360/MAX4456 have an internal power-on reset (POR) circuit that remains low for 5μs after power is applied. POR also remains low if the total supply voltage is less than 4V. The PO R disables all buffer outputs at power-up , but the switch matrix is not preset to any initial condition. The desired switch state should be programmed before the buffer outputs are enabled.

Digital Interface

The desired switch state can be loaded in a parallel-interface mode or serial-interface mode (Table 3 and Figures 4, 5, 6). All action associated with the WR line occurs on its rising edge. The same is true for the LATCH line if EDGE/LEVEL is high. Otherwise, the sec-ond-rank registers update while LATCH is low (when EDGE/LEVEL is low). WR is logically ANDed with CE and CE (when present) to allow active-high or active-low chip enable.

6-Bit Parallel-Interface Mode

(MAX4359/MAX4360)

I n the MAX4359/MAX4360’s parallel-interface mode (SER/PAR = GND), the six data bits specify an output channel (A1, A0) and the input channel to which it con-nects (D3–D0). This data is loaded on the rising edge of WR. The input channels are selected by codes 0000

through 0111 (D3–D0) for the MAX4360, and codes 0000 through 0011 (D3–D0) for the MAX4359. Note that the MAX4359 does not use codes 0100 through 0111.The eight codes 1000 through 1111 control other func-tions, as listed in Table 1.

7-Bit Parallel-Interface Mode (MAX4456)

I n the MAX4456’s parallel-interface mode (SER/PAR =GND), the seven data bits specify an output channel (A2, A1, A0) and the input channel to which it connects (D3–D0). This data is loaded on the rising edge of WR.The input channels are selected by codes 0000through 0111 (D3–D0) for the MAX4456. The remaining eight codes 1000 through 1111 control other functions,as listed in Table 1.

16-Bit Serial-Interface Mode

(MAX4359/MAX4360)

In serial mode (SER/PAR = V CC ), all first-rank registers are loaded with data, making it unnecessary to specify an output address (A1, A0). The input data format is D3–D0, starting with OUT0 and ending with OUT3 for 16 total bits. For the MAX4360, only codes 0000through 1010 are valid. For the MAX4359, only the codes 0000 through 0011 and codes 1000 through 1010 are valid. Code 1010 disables a buffer, while code 1001 enables it. After data is shifted into the 16-bit first-rank register, it is transferred to the second rank by LATCH (Table 2), which updates the switches.

Table 1. Parallel-Interface Mode Functions

M A X 4359/M A X 4360/M A X 4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches 8

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32-Bit Serial-Interface Mode (MAX4456)

In serial mode (SER/PAR = V CC ), all first-rank registers are loaded with data, making it unnecessary to specify an output address (A2, A1, A0). The input data format is D3–D0, starting with OUT0 and ending with OUT7 for 32 total bits. Only codes 0000 through 1010 are valid.Code 1010 disables a buffer, while code 1001 enables it. After data is shifted into the 32-bit first-rank register,it is transferred to the second rank by LATCH (Table 2),which updates the switches.

Typical Application

Figure 2 shows a typical application of the MAX4456(PDI P) with the MAX4395 quad, operational amplifiers at the outputs to drive 75?loads. This application shows the MAX4456 digital-switch control interface set up in the 7-bit parallel mode. The MAX4456 uses seven data lines and two control lines (WR and LATCH). Two additional lines may be needed to control CE and LOAD when using multiple MAX4456s.

The input/output information is presented to the chip at A2, A1, A0, and D3–D0 by a parallel printer port. The data is stored in the 1st-rank registers on the rising edge of WR. When the LATCH line goes high, the switch configuration is loaded into the 2nd-rank regis-ters, and all eight outputs enter the new configuration at the same time. Each 7-bit word updates only one out-put buffer at a time. If several buffers are to be updat-ed, the data is individually loaded into the 1st-rank reg-isters. Then, a single LATCH pulse is used to reconfig-ure all channels simultaneously.

The short BASIC program in Figure 3 loads programming data into the MAX4456 from any IBM PC or compatible. It uses the computer’s “LPT1” output to interface to the cir-cuit, then automatically finds the address for LPT1 and displays a table of valid input values to be used. The pro-gram does not keep track of previous commands, but it does display the last data sent to LPT1, which is written and latched with each transmission. A similar application is possible with the MAX4359/MAX4360.

SERIAL /PARALLEL

X L H

(A2), A1,A0

X Output Buffer Address Output Buffer Address

D1Serial Output Parallel Input Parallel Input

X Parallel Input Parallel Input

Serial Input Parallel Input Parallel Input

COMMENT

Serial Mode

Parallel Mode,

D0–D2 = Control Code Parallel Mode,

D0–D2 = Input Address

L Table 3. Input/Output Line Configurations

X = Don’t care, H = 5V, L = 0V ( ) are for MAX4456 only.Chip Information

MAX4359 TRANSISTOR COUNT: 2372MAX4360 TRANSISTOR COUNT: 2372MAX4456 TRANSISTOR COUNT: 3820

MAX4359/MAX4360/MAX4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches

_______________________________________________________________________________________

Figure 2. MAX4456 (plastic DIP) Typical Application Circuit

M A X 4359/M A X 4360/M A X 4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches 10

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Timing Diagrams

Figure 3. BASIC Program for Loading Data into the MAX4456 from a PC Using Figure 2’s Circuit

Figure 4. Write Timing for Serial- and Parallel-Interface Modes

Timing Diagrams (continued)

MAX4359/MAX4360/MAX4456Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches Array

Figure 5. Parallel-Interface Mode Format (SER/PAR= GND)

Figure 6. Serial-Mode Interface Format (SER/PAR= V CC)

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M A X 4359/M A X 4360/M A X 4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches 12

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Note 1:Connect LOAD to +5V (internal 400?loads on at all outputs).

Note 2:Program any one input to connect to any one output. See Table 1 or 2 for programming codes.Note 3:Turn on the buffer at the selected output (Table 1 or 2).

Note 4:Drive the selected input with V IN , and measure V OUT at the -3dB frequency at the selected output.

Note 5:

Program each numbered input to connect to the same numbered output (IN0 to OUT0, IN1 to OUT1, etc., for the MAX4456;also IN4 to OUT0, IN5 to OUT1, etc., for the MAX4360.) See Table 1 or 2 for programming codes.

Note 6:Turn off all output buffers (Table 1 or 2).

Note 7:Drive all inputs with V IN , and measure V OUT at any output.Note 8:Isolation (in dB) = 20log 10(V OUT /V IN ).Note 9:Turn on all output buffers (Table 1 or 2).

Note 10:Drive any one input with V IN , and measure V OUT at any undriven output.Note 11:Crosstalk (in dB) = 20log 10(V OUT /V IN ).

Note 12:Drive all but one input with V IN , and measure V OUT at the undriven output.

Dynamic Test Circuits

Pin Configurations

MAX4359/MAX4360/MAX4456Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches

S S O P .E P S

M A X 4359/M A X 4360/M A X 4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches 14______________________________________________________________________________________

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to https://www.wendangku.net/doc/c015755159.html,/packages .)

MAX4359/MAX4360/MAX4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches

______________________________________________________________________________________15

S O I C W .E P S

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to https://www.wendangku.net/doc/c015755159.html,/packages .)

M A X 4359/M A X 4360/M A X 4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches 16______________________________________________________________________________________

P L C C .E P S

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to https://www.wendangku.net/doc/c015755159.html,/packages .)

MAX4359/MAX4560/MAX4456

Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. N o circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________17?2007 Maxim Integrated Products

is a registered trademark of Maxim Integrated Products, Inc.

P D I P W .E P S

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to https://www.wendangku.net/doc/c015755159.html,/packages .)

Revision History

Pages changed at Rev 2: 1, 6, 8, 9, 14–17