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MAX3455E Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3455E Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page ±15kV ESD-Protected USB Transceivers ______________________________________________________________________________________ 11 Disable Mode Connect VBUS to a system power supply and leave VL unconnected or connect to GND. D+ and D- enter a tri- state mode and VBUS (or VBUS and VTRM) consumes less than 20µA of supply current. D+ and D- withstand external signals up to +5.5V in disable mode (Table 2). Sharing Mode Connect VL to a system power supply and leave VBUS (or VBUS and VTRM) unconnected or connect to GND. D+ and D- enter a tri-state mode, allowing other circuitry to share the USB D+ and D- lines, and VL consumes less than 20µA of supply current. D+ and D- withstand external signals up to +5.5V in sharing mode (Table 2). Device Control OE OE controls the direction of communication. Drive OE low to transfer data from the logic side to the USB side. For OE = low, VP and VM serve as differential driver inputs to the USB transmitter. Drive OE high to transfer data from the USB side to the logic side. For OE = high, VP and VM serve as single- ended receiver outputs from the USB inputs (D+ and D-). RCV serves as a differential receiver out- put, regardless of the state of OE. ENUM (MAX3453E/MAX3454E) The MAX3453E/MAX3454E feature an enumerate func- tion that allows software control of USB enumeration. USB protocol requires a 1.5k Ω pullup resistor to D+ or D- to indicate the transmission speed to the host (see the SPD section). The MAX3453E/MAX3454E provide an internal 1.5k Ω pullup resistor. Disconnect the pullup resistor from the circuit to simulate the removal of a device from the USB. Drive ENUM low to disconnect the internal pullup resistor. Drive ENUM high to connect the internal pullup resistor. The SPD state (MAX3454E only) determines whether the pullup resistor connects to D+ or D-. For ENUM = high, the internal pullup resis- tor connects to D+ when SPD = VL (full speed) or to D- when SPD = GND (low speed). The MAX3453E only supports full-speed operation; therefore, the pullup resistor only connects to D+ or is disconnected. Figure 1. Rise and Fall Times VOHD VOLD 90% 10% 90% 10% tFR, tLR tFF, tLF Table 3a. Transmit Truth Table (OE = 0, SUS = 0) INPUTS OUTPUTS VP VM D+ D- RCV OUTPUT STATE 00 00X SE0 0 1 0 1 0 Logic 0 1 0 1 0 1 Logic 1 1 1 1 1 X Undefined X = Undefined. Table 3b. Transmit Truth Table (OE = 0, SUS = 1) INPUTS OUTPUTS VP VM D+ D- RCV OUTPUT STATE 00 00 0 SE0 0 1 0 1 0 Logic 0 1 0 1 0 0 Logic 1 1 1 1 1 0 Undefined Table 4a. Receive Truth Table (OE = 1 and SUS = 0) INPUTS OUTPUTS D+ D- VP VM RCV OUTPUT STATE 0 000 X SE0 0 1010 Logic 0 1 0101 Logic 1 1 1 1 1 X Undefined X = Undefined. Table 4b. Receive Truth Table (OE = 1 and SUS = 1) INPUTS OUTPUTS D+ D- VP VM RCV OUTPUT STATE 0 0000 SE0 0 1010 Logic 0 1 0100 Logic 1 1 1110 Undefined |
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