PDF MAX456 Data sheet ( Hoja de datos )

Número de pieza	MAX456
Descripción	8 x 8 Video Crosspoint Switch
Fabricantes	Maxim Integrated
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No Preview Available ! 19-2858; Rev 2; 2/94 8 x 8 Video Crosspoint Switch _______________General Description The MAX456 is the first monolithic CMOS 8 x 8 video crosspoint switch that significantly reduces component count, board space, and cost. The crosspoint switch contains a digitally controlled matrix of 64 T-switches that connect eight video input signals to any, or all, out- put channels. Each matrix output connects to eight internal, high-speed (250V/µs), unity-gain-stable buffers capable of driving 400Ω and 20pF to ±1.3V. For appli- cations requiring increased drive capability, the MAX456 outputs can be connected directly to two MAX470 quad, gain-of-two video buffers, which are capable of driving 75Ω loads. Three-state output capability and internal, programma- ble active loads make it feasible to parallel multiple MAX456s and form larger switch matrices. In the 40-pin DIP package, crosstalk (70dB at 5MHz) is minimized, and board area and complexity are simpli- fied by using a straight-through pinout. The analog inputs and outputs are on opposite sides, and each channel is separated by a power-supply line or quiet digital logic line. ________________________Applications Video Test Equipment Video Security Systems Video Editing ________Typical Application Circuit 8 INPUT CHANNELS WR LATCH MAX456 MAX470 AV = 2 75Ω 75Ω OUTPUT SELECT INPUT SELECT OR SERIAL I/O A2 A1 A0 8X8 T-SWITCH MATRIX D3 D2 D1/SER OUT D0/SER IN AV = 2 MAX470 ____________________________Features o Routes Any Input Channel to Any Output Channel o Switches Standard Video Signals o Serial or Parallel Digital Interface o Expandable for Larger Switch Matrices o 80dB All-Channel Off Isolation at 5MHz o 8 Internal Buffers with: 250V/µs Slew Rate, Three-State Output Capability, Power-Saving Disable Feature, 35MHz Bandwidth ______________Ordering Information PART MAX456CPL MAX456CQH MAX456C/D TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C PIN-PACKAGE 40 Plastic DIP 44 PLCC Dice* Ordering Information continued on last page. * Dice are specified at TA = +25°C, DC parameters only. _________________Pin Configurations TOP VIEW D1/SER OUT 1 D0/SER IN 2 A2 3 A1 4 IN0 5 A0 6 IN1 7 LOAD 8 IN2 9 DGND 10 IN3 11 DGND 12 IN4 13 EDGE/LEVEL 14 IN5 15 V+ 16 IN6 17 SER/PAR 18 IN7 19 V- 20 MAX456 PLCC on last page DIP 40 V+ 39 OUT0 38 D2 37 OUT1 36 D3 35 OUT2 34 V- 33 OUT3 32 AGND 31 OUT4 30 AGND 29 OUT5 28 AGND 27 OUT6 26 V+ 25 OUT7 24 CE 23 CE 22 LATCH 21 WR ________________________________________________________________ Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature. 1 page 8 x 8 Video Crosspoint Switch _______________Detailed Description Output Buffers The MAX456 video crosspoint switch consists of 64 T-switches in an 8 x 8 grid (Figure 1). The 8 matrix out- puts are followed by 8 wideband buffers optimized for driving 400Ω and 20pF loads. Each buffer has an internal active load on the output that can be readily shut off via the LOAD input (off when LOAD = 0V). The shut-off is useful when two or more MAX456 circuits 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. And, when active, the buffer must have either 1) an internal load, 2) the internal load of another buffer in another MAX456, or 3) an external load. Each MAX456 output can be disabled under logic con- trol. When a buffer is disabled, its output enters a high- impedance state. In multichip parallel applications, the disable function prevents inactive outputs from loading lines driven by other devices. Disabling the inactive buffers reduces power consumption. The MAX456 outputs connect easily to MAX470 quad, gain-of-two buffers when 75Ω loads must be driven. Power-On RESET The MAX456 has an internal power-on reset (POR) cir- cuit that remains low for 5µs when power is applied. POR also remains low if the total supply voltage is less than 4V. The POR disables all buffer outputs at power-up, but the switch matrix is not preset to any ini- tial condition. The desired switch state should be pro- grammed before the buffer outputs are enabled. ___________________Digital Interface The desired switch state can be loaded in a 7-bit paral- lel-interface mode or 32-bit serial-interface mode (see Table 3 and Figures 4-6). All action associated with the WR the line occurs LATCH line oifnEiDtsGrEis/i–L—nEg—V—eE—dL–gies. The high. same is true for Otherwise, the s(CweEhceoannndEd-Dr–CGa—En–Ek/tL–—orE—eV—agEl—liLo–stwiesralsocwut)ipv. edW-ahRtiegishwlohogirliecaacLlltyAivTAeCN-lHDoweidscwlhoiitwph enable. 7-Bit Parallel Mode In the parallel-interface mode, the 7 data bits A2-A0 and D3-D0 specify an output channel (A2-A0) and the input channel to which it connects (D3-D0). The data is loaded on the rising edge of WR. The 8 input channels are selected by 0000 through 0111 (D3-D0). The remaining 8 codes (1000-1111) control other MAX456 functions, as listed in Table 1. In serial mode (SER3/–P2—A-—BR–it= Serial-Interface Mode high), 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 the LATCH line (see Table 2). _______________________________________________________________________________________ 5 5 Page 8 x 8 Video Crosspoint Switch _______________________________________________________Dynamic Test Circuits IN0 OUT0 IN1 OUT1 IN2 OUT2 IN3 MAX456 OUT3 IN4 OUT4 IN5 OUT5 IN6 OUT6 IN7 OUT7 LOAD VOUT +5V VIN = 2Vp-p, SWEEP FREQUENCY RS = 75Ω -3dB Bandwidth (Notes 1-4) IN0 OUT0 IN1 OUT1 IN2 OUT2 IN3 MAX456 OUT3 IN4 OUT4 IN5 OUT5 IN6 OUT6 IN7 OUT7 LOAD VIN = 2Vp-p @ 5MHz RS = 75Ω VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT +5V All-Channel Off Isolation (Notes 1, 5-8) 7x 75Ω IN0 OUT0 IN1 OUT1 IN2 OUT2 IN3 MAX456 OUT3 IN4 OUT4 IN5 OUT5 IN6 OUT6 IN7 OUT7 LOAD VIN = 2Vp-p @ 5MHz RS = 75Ω VOUT VOUT VOUT VOUT VOUT VOUT VOUT +5V IN0 OUT0 VOUT IN1 OUT1 75Ω IN2 OUT2 IN3 MAX456 OUT3 IN4 OUT4 IN5 OUT5 IN6 OUT6 IN7 OUT7 LOAD +5V VIN = 2Vp-p @ 5MHz RS = 75Ω Single-Channel Crosstalk (Notes 1, 5, 9-11) All-Channel Crosstalk (Notes 1, 5, 9, 11, 12) Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: Note 10: Note 11: Note 12: Connect LOAD (pin 8) to +5V (internal 400Ω loads on at all outputs). Program any one input to connect to any one output (see Table 1 or 2 for programming codes). Turn on buffer at the selected output (see Table 1 or 2). Drive the selected input with VIN, and measure VOUT at the -3dB frequency at the selected output. Program each numbered input to connect to the same numbered output (IN0 to OUT0, IN1 to OUT1, etc.). See Table 1 or 2 for programming codes. Turn off all output buffers (see Table 1 or 2). Drive all inputs with VIN and measure VOUT at any output. Isolation (in dB) = 20log10 (VOUT/VIN). Turn on all output buffers (see Table 1 or 2). Drive any one input with VIN and measure VOUT at any undriven output. Crosstalk (in dB) = 20log10 (VOUT/VIN). Drive all but one input with VIN and measure VOUT at the undriven output. ______________________________________________________________________________________ 11 11 Page

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