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MAX466 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX466 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page Two-Channel, Triple/Quad RGB Video Switches and Buffers ______________________________________________________________________________________ 11 When LE is connected to ground, the E — N – register is transparent and independent of C — S – activity. This allows all MAX463–MAX466 devices to be simultaneously shut down, regardless of the C — S – input state. Simply connect LE to ground and connect all E — N – inputs together (Figure 5a). For the MAX464 and MAX466, LE must be hard- wired to either V+ or ground (rather than driving LE with a gate) to prevent crosstalk from the digital inputs to IN0A. Another option for output disable is to connect LE to V+, parallel the outputs of several MAX463-MAX466s, and use E — N – to individually disable all devices but the one in use (Figure 5b). When the outputs are disabled, the off isolation from the analog inputs to the amplifier outputs is typically 70dB at 10MHz, all inputs driven with a 4VP-P sine wave and a 150 Ω load impedance. Figure 6 shows the test circuits used to measure isolation and crosstalk. Table 1a. Amplifier and Channel Selection with LE = V+ Table 1b. Amplifier and Channel Selection with LE = GND Disables amplifiers. Outputs high-Z. A0 register = channel B 1 1 0 Disables amplifiers. Outputs high-Z. X 1 1 Enables amplifier outputs, latches A0 register, programs outputs to output A or B, according to the setting of A0 at C — S – 's last edge. X 0 1 Disables amplifiers. Outputs high-Z. A0 register = channel A 0 1 0 Enables amplifier outputs. Selects channel B. 1 0 0 Enables amplifier outputs. Selects channel A. 0 0 0 FUNCTION A0 E — N – C — S – Latches all input registers. Changes nothing. Enables amplifier outputs. Selects channel B. Enables amplifier outputs. Selects channel A. X X 1 Disables amplifiers. Outputs high-Z. X 1 0 1 0 0 0 0 0 FUNCTION A0 E — N – C — S – MAX463– MAX466 MAX463– MAX466 MAX463– MAX466 MAX463– MAX466 SHUTDOWN LE LE EN EN CS EN +5V +5V AO LE EN CS AO LE (a) (b) Figure 5. (a) Simultaneous Shutdown of all MAX463–MAX466, (b) Enable ( – E — N – ) Register Latched by – C — S – NOTE: ISOLATION RESISTORS, IF REQUIRED, NOT SHOWN. |
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