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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 400Ωand 20pF at 2.6V P-P . For applications requiring incread 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 qu
iet power supply or digital input line parates each channel, which reduces crosstalk to -70dB at 5MHz. For applications demanding better DC specifications, e 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
德州驴
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 otherwi noted.Typical values are at T A = +25°C.)
Stress beyond tho listed under “Absolute Maximum Ratings” may cau permanent damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indicated in the operational ctions 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 -0.3V to +12V Negative Supply Voltage (V-) Referred to AGND ......-12V to +0.3V DGND ±0.3V Buffer Short Circuit to Ground when
松铺厚度Not Exceeding Package Indefinite Analog (V+ + 0.3V) to (V- - 0.3V)Digital (V+ + 0.3V) to (V- - 0.3V)Input Current, Power On or Off
.±20mA ±50mA
钳工技术
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 +150°C Storage -65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C
ABSOLUTE MAXIMUM RATINGS
组织生活会的意义MAX4359/MAX4360/MAX4456
Low-Cost 4x4, 8x4, 8x8Video Crosspoint Switches
_______________________________________________________________________________________3
Note 1:See Dynamic Test Circuits ction.
Note 2:3dB typical crosstalk improvement when R S = 0.
Note 3:Input test signal: 3.58MHz sine wave of amplitude 40IRE superimpod 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脸部变形
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
光源色50
ns
Write Pul Width Low t WL 80ns Chip-Enable to Write Setup t CE 0ns Write Pul Width High t WH 80ns 240Data Hold t DH 0ns Latch Pul Width t L 80ns CONDITIONS
LATCH on Parallel mode Serial mode
逼迫
马尼拉大屠杀
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 otherwi 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 otherwi 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
_______________________________________________________________________________________
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 400Ωand 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 uful when two or more cross-points are connected in parallel to create more input channels. With more input channels, only one t of
buffers can be active and only one t 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 75Ωcoaxial cable must be driven.
Figure 1. MAX4456 Functional Diagram
