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TXS0101DCKR Datasheet(PDF) 8 Page - Texas Instruments |
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TXS0101DCKR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 18 page www.ti.com 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 Pullup or Pulldown Resistors on I/O Lines TXS0101 1-BIT BIDIRECTIONAL VOLTAGE-LEVEL TRANSLATOR FOR OPEN-DRAIN APPLICATIONS SCES638 – OCTOBER 2007 Figure 1. Architecture of a TXS01xx Cell Each A-port I/O has an internal 10-k Ω pullup resistor to VCCA, 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 TXS0101. 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 TXS0101 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. Each A-port I/O has an internal 10-k Ω pullup resistor to VCCA, and each B-port I/O has an internal 10-kΩ pullup resistor to VCCB. If a smaller value of pullup resistor is required, an external resistor must be added from the I/O to VCCA or VCCB (in parallel with the internal 10-kΩ resistors). 8 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TXS0101 |
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