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MAX3375 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3375 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 25 page ±15kV ESD-Protected, 1µA, 16Mbps, Dual/Quad Low-Voltage Level Translators in UCSP ______________________________________________________________________________________ 11 circuitry limits the maximum data rate for devices in the MAX3372E–MAX3379E, MAX3390E–MAX3393E family to 16Mbps. The maximum data rate also depends heavily on the load capacitance (see Typical Operating Characteristics), output impedance of the driver, and the operational voltage range (see Timing Characteristics). Speed-Up Circuitry The MAX3373E–MAX3376E/MAX3378E/MAX3379E and MAX3390E–MAX3393E feature a one-shot generator that decreases the rise time of the output. When triggered, MOSFETs PU1 and PU2 turn on for a short time to pull up I/O VL_ and I/O VCC_ to their respective supplies (see Figure 2b). This greatly reduces the rise time and propa- gation delay for the low-to-high transition. The scope photo of Rail-to-Rail Driving for 8Mbps Operation in the Typical Operating Characteristics shows the speed-up circuitry in operation. Three-State Output Mode Pull THREE-STATE low to place the MAX3372E– MAX3379E and MAX3390E–MAX3393E in three-state out- put mode. Connect THREE-STATE to VL (logic high) for normal operation. Activating the three-state output mode disconnects the internal 10k Ω pullup resistors on the I/O VCC and I/O VL lines. This forces the I/O lines to a high- impedance state, and decreases the supply current to less than 1µA. The high-impedance I/O lines in three- state output mode allow for use in a multidrop network. When in three-state output mode, do not allow the voltage at I/O VL_ to exceed (VL + 0.3V), or the voltage at I/O VCC_ to exceed (VCC + 0.3V). Thermal Short-Circuit Protection Thermal overload detection protects the MAX3372E– MAX3379E and MAX3390E–MAX3393E from short-circuit fault conditions. In the event of a short-circuit fault, when the junction temperature (TJ) reaches +152°C, a thermal sensor signals the three-state output mode logic to force the device into three-state output mode. When TJ has cooled to +142°C, normal operation resumes. MAX3372E–MAX3379E AND MAX3390E–MAX3393E I/O VL_ I/O VCC_ VCC VCC VL VL GND I/O VCC_ tPD-VCC-LH tPD-VCC-HL I/O VL_ tRVCC tFVCC DATA RLOAD CLOAD Figure 1c. Open-Drain Driving I/O VCC MAX3373E–MAX3376E, MAX3378E/MAX3379E AND MAX3390E–MAX3393E I/O VL_ I/O VCC_ DATA I/O VCC_ VCC VCC VL VL GND RLOAD CLOAD tPD-VL-LH tPD-VL-HL I/O VL_ tRVL tFVL Figure 1d. Open-Drain Driving I/O VL |
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