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MAX3013EBP-T Datasheet(PDF) 11 Page - STMicroelectronics |
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MAX3013EBP-T Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 17 page +1.2V to +3.6V, 0.1µA, 100Mbps, 8-Channel Level Translators ______________________________________________________________________________________ 11 Detailed Description The MAX3013 logic-level translator provides the level shifting necessary to allow 100Mbps 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 MAX3013 bidirection- al level translator allows data translation in either direc- tion (VL ↔ VCC) on any single data line. The MAX3013 accepts VL from +1.2V to (VCC - 0.4V) and operate with VCC from +1.65V to +3.6V, making it ideal for data trans- fer between low-voltage ASICs/PLDs and higher voltage systems. The MAX3013 features an input enable mode (EN) that reduces VCC and VL supply currents to 0.1µA, when in tristate mode. This device operates at a guaranteed data rate of 100Mbps for VL > +1.8V. Level Translation For proper operation, ensure that +1.65V ≤ VCC ≤ +3.6V, +1.2V ≤ VL ≤ (VCC - 0.4V). During power-up sequencing, VL ≥ VCC does not damage the device. During power- supply sequencing, when VCC is floating and VL is pow- ering up, up to 40mA current can be sourced to each load on the VL side, yet the device does not latch up. The maximum data rate depends heavily on the load capacitance (see the Typical Operating Characteristics, Rise/Fall Times), output impedance of the driver, and the operating voltage range (see the Timing Characteristics). Input Driver Requirements The MAX3013 architecture is based on a one-shot accelerator output stage (see Figure 5). Accelerator output stages are always in tristate mode 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 accelerator output stages become active and charge/discharge 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 translator. However, this behavior helps to speed up the transition on the driven side. For proper operation, the external driver must meet the following conditions: <25 Ω output impedance and >20mA output current. Figure 6 shows a graph of Typical Input Current vs. Input Voltage. Output Load Requirements The MAX3013 I/O was designed to drive CMOS inputs. Do not load the I/O lines with a resistive load less than 25k Ω. Also, do not place an RC circuit at the input of the MAX3013 to slow down the edges. If a slower data rate is required, please see the MAX3000E/MAX3001E logic-level translator. For I2C™ level translation, please refer to the MAX3372E– MAX3379E/MAX3390E–MAX3393E data sheet. OVCC VL IVL VCC P ONE-SHOT N ONE-SHOT TYPICAL DRIVING ONE-CHANNEL ON VL SIDE 150 Ω 4k Ω IVCC VL OVL VCC TYPICAL DRIVING ONE-CHANNEL ON VCC SIDE 4k Ω 150 Ω N ONE-SHOT P ONE-SHOT Figure 5. MAX3013 Simplified Diagram (1 I/O line) I2C is a trademark of Philips Corp. Purchase of I2C components of Maxim Integrated Products, Inc. or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provid- ed that the system conforms to the I2C Standard Specification as defined by Philips. |
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