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NVT2004 Datasheet(PDF) 11 Page - NXP Semiconductors |
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NVT2004 Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 33 page NVT2003_04_06 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved. Product data sheet Rev. 5 — 19 February 2014 11 of 33 NXP Semiconductors NVT2003/04/06 Bidirectional voltage-level translator 7.5 How to design for maximum frequency operation The maximum frequency is limited by the minimum pulse width LOW and HIGH as well as rise time and fall time. See Equation 1 as an example of the maximum frequency. The rise and fall times are shown in Figure 11. (1) The rise and fall times are dependent upon translation voltages, the drive strength, the total node capacitance (CL(tot)) and the pull-up resistors (RPU) that are present on the bus. The node capacitance is the addition of the PCB trace capacitance and the device capacitance that exists on the bus. Because of the dependency of the external components, PCB layout and the different device operating states the calculation of rise and fall times is complex and has several inflection points along the curve. The main component of the rise and fall times is the RC time constant of the bus line when the device is in its two primary operating states: when device is in the ON state and it is low-impedance, the other is when the device is OFF isolating the A-side from the B-side. A description of the fall time applied to either An or Bn output going from HIGH to LOW is as follows. Whichever side is asserted first, the B-side down must discharge to the VCC(A) voltage. The time is determined by the pull-up resistor, pull-down driver strength and the Table 8. Pull-up resistor minimum values, 15 mA driver sink current for PCA9306 and NVT20xx A-side B-side 1.2 V 1.5 V 1.8 V 2.5 V 3.3 V 5.0 V 1.0 V Rpu(A) = 147 Rpu(B) = 147 Rpu(A) =169 Rpu(B) =169 Rpu(A) = 191 Rpu(B) = 191 Rpu(A) = none Rpu(B) =178 Rpu(A) = none Rpu(B) = 237 Rpu(A) = none Rpu(B) =365 1.2 V Rpu(A) =182 Rpu(B) =182 Rpu(A) = 205 Rpu(B) = 205 Rpu(A) = none Rpu(B) =178 Rpu(A) = none Rpu(B) = 237 Rpu(A) = none Rpu(B) =365 1.5 V Rpu(A) = 221 Rpu(B) = 221 Rpu(A) = none Rpu(B) =174 Rpu(A) = none Rpu(B) = 232 Rpu(A) = none Rpu(B) =357 1.8 V Rpu(A) =294 Rpu(B) =294 Rpu(A) = none Rpu(B) = 232 Rpu(A) = none Rpu(B) =357 2.5 V Rpu(A) = 392 Rpu(B) = 392 Rpu(A) = none Rpu(B) =357 3.3 V Rpu(A) = none Rpu(B) =348 Fig 11. An example waveform for maximum frequency f max 1 t LOW min t HIGH min t r actual t f actual ++ + ------------------------------------------------------------------------------------------------------------- = 002aag912 tr(actual) tf(actual) GND VOL VIL VIH VCC tHIGH(min) tLOW(min) 1 / fmax 0.9 × VCC 0.1 × VCC |
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