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MAX3002 Datasheet(PDF) 15 Page - Maxim Integrated Products |
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MAX3002 Datasheet(HTML) 15 Page - Maxim Integrated Products |
15 / 24 page +1.2V to +5.5V, ±15kV ESD-Protected, 0.1µA, 35Mbps, 8-Channel Level Translators ______________________________________________________________________________________ 15 Detailed Description The MAX3000E/MAX3001E/MAX3002–MAX3012 logic- level translators provide the level shifting necessary to allow data transfer in a multivoltage system. Externally applied voltages, VCC and VL, set the logic levels on either side of the device. Logic signals present on the VL side of the device appear as a higher voltage logic signal on the VCC side of the device, and vice-versa. The MAX3000E/MAX3001E/MAX3002/MAX3003 are bidirectional level translators allowing data translation in either direction (VL ↔ VCC) on any single data line. The MAX3004–MAX3012 unidirectional level translators level shift data in one direction (VL → VCC or VCC → VL) on any single data line. The MAX3000E/MAX3001E/ MAX3002–MAX3012 accept VL from +1.2V to +5.5V. All devices have VCC ranging from +1.65V to +5.5V, mak- ing them ideal for data transfer between low-voltage ASICs/PLDs and higher voltage systems. The MAX3000E/MAX3001E/MAX3002/MAX3004– MAX3012 feature an output enable mode that reduces VCC supply current to less than 2µA, and VL supply current to less than 2µA when in shutdown. The MAX3000E/MAX3001E have ±15kV ESD protection on the VCC side for greater protection in applications that route signals externally. The MAX3000E operates at a guaranteed data rate of 230kbps; the MAX3001E oper- ates at a guaranteed data rate of 4Mbps and the MAX3002–MAX3012 are guaranteed with a data rate of 20Mbps of operation over the entire specified operating voltage range. Level Translation For proper operation, ensure that +1.65V ≤ VCC ≤ +5.5V, +1.2V ≤ VL ≤ +5.5V, and VL ≤ VCC. During power-up sequencing, VL ≥ VCC does not damage the device. During power-supply sequencing, when VCC is floating and VL is powering up, up to 10mA current can be sourced to each load on the VL side, yet the device does not latch up. The maximum data rate also depends heavily on the load capacitance (see the Typical Operating Characteristics), output impedance of the driver, and the operational voltage range (see the Timing Characteristics). Input Driver Requirements The MAX3001E/MAX3002–MAX3012 architecture is based on a one-shot accelerator output stage. See Figure 5. Accelerator output stages are always in three- state except when there is a transition on any of the translators on the input side, either I/O VL or I/O VCC. Then, a short pulse is generated during which the accel- erator output stages become active and charge/dis- charge the capacitances at the I/Os. Due to its bidirectional nature, both input stages become active during the one-shot pulse. This can lead to some current feeding into the external source that is driving the trans- lator. However, this behavior helps to speed up the tran- sition on the driven side. For proper operation, the driver has to meet the follow- ing conditions: 50 Ω maximum output impedance and 20mA minimum output current (for 20Mbps versions), 400 Ω maximum output impedance and 4mA minimum output current (for 4Mbps versions), 1k Ω maximum out- put impedance and 1mA minimum output current (for 230kbps versions). Figure 6 shows a typical input cur- rent vs. input voltage. Enable Output Mode (EN, EN A/B) The MAX3000E/MAX3001E/MAX3002 and the MAX3004– MAX3012 feature an EN input, and the MAX3003 has an EN A/B input. Pull EN low to set the MAX3000E/ MAX3001E/MAX3002/MAX3004–MAX3012s’ I/O VCC1 through I/O VCC8 in three-state output mode, while I/O VL1 through I/O VL8 have internal 6k Ω pulldown resis- tors. Drive EN to logic high (VL) for normal operation. For the MAX3003, pull EN A/B low to place channels 1B through 4B in active mode, while channels 1A through 4A are in three-state mode. Drive EN A/B to logic high (VL) to enable channels 1A through 4A, while channels 1B through 4B remain in three-state mode. ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electro- static discharges encountered during handling and assembly. The I/O VCC lines have extra protection against static discharge. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, three-state output mode, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing products can latch and must be powered down to remove latchup. ESD protection can be tested in various ways. The I/O VCC lines of the MAX3000E/MAX3001E are char- acterized for protection to ±15kV using the Human Body Model. |
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