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TXS0104EDRG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TXS0104EDRG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 21 page www.ti.com PRINCIPLES OF OPERATION Applications Architecture V CCB B V CCA V CCB GateBias One- shot One- shot 10k 10k T1 T2 A Input Driver Requirements Power Up Enable and Disable TXS0104E 4-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS SCES651B – JUNE 2006 – REVISED FEBRUARY 2007 The TXS0104E can be used in level-translation applications for interfacing devices or systems operating at different interface voltages with one another. The TXS0104E is ideal for use in applications where an open-drain driver is connected to the data I/Os. The TXS0104E can also be used in applications where a push-pull driver is connected to the data I/Os, but the TXB0104 might be a better option for such push-pull applications. The TXS0104E architecture (see Figure 1) does not require a direction-control signal to control the direction of data flow from A to B or from B to A. Figure 1. Architecture of a TXS01xx Cell Each A-port I/O has an internal 10-k Ω pullup resistor to V CCA, and each B-port I/O has an internal 10-kΩ pullup resistor to VCCB. The output one-shots detect rising edges on the A or B ports. During a rising edge, the one-shot turns on the PMOS transistors (T1,T2) for a short duration, which speeds up the low-to-high transition. The fall time (tfA, tfB) of a signal depends on the output impedance of the external device driving the data I/Os of the TXS0104E. Similarly, the tPHL and max data rates also depend on the output impedance of the external driver. The values for tfA, tfB, tPHL, and maximum data rates in the data sheet assume that the output impedance of the external driver is less than 50 Ω. During operation, ensure that VCCA ≤ VCCB at all times. During power-up sequencing, VCCA ≥ VCCB does not damage the device, so any power supply can be ramped up first. The TXS0104E has an OE input that is used to disable the device by setting OE low, which places all I/Os in the Hi-Z state. The disable time (tdis) indicates the delay between the time when OE goes low and when the outputs actually get disabled (Hi-Z). The enable time (ten) indicates the amount of time the user must allow for the one-shot circuitry to become operational after OE is taken high. 9 Submit Documentation Feedback |
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