Texas Instruments SN74AXCH1T45 Dual-Supply Bus Transceivers
Texas Instruments SN74AXCH1T45 Dual-Supply Bus Transceivers utilize two individually configurable power-supply rails. The power-supply rails allow each port to operate with a power supply range from 0.65V to 3.6V. The A port is designed to track VCCA, which accepts any supply voltage from 0.65V to 3.6V. The B port is designed to track VCCB, which also accepts any supply voltage from 0.65V to 3.6V.
The DIR pin determines the direction of signal propagation. When configured HIGH, the DIR pin translates from Port A to Port B. Additionally, translation is from Port B to Port A when the DIR is configured LOW. The DIR pin is referenced to VCCA, indicating that the logic-high and logic-low thresholds track with VCCA. Active bus-hold circuitry holds unused or undriven inputs at a valid logic state.
The device is fully specified for partial-power-down applications using the Ioff current, which ensures that no excessive current is drawn from or to an input, output, or combined I/O that is biased to a specific voltage while the device is powered down. The Texas Instruments SN74AXCH1T45 VCC isolation feature ensures that if either VCCA or VCCB is less than 100mV, both I/O ports enter a high-impedance state by disabling the outputs. Additionally, the glitch-free power supply sequencing allows either supply rail to be powered on or off in any order while providing robust power sequencing performance.
Features
- A fully configurable dual-rail design allows each port to operate with a power supply range from 0.65V to 3.6V
- –40°C to +125°C operating temperature
- Glitch-free power supply sequencing
- Bus-hold on data inputs eliminates the need for external pullup or pulldown resistors
- Maximum quiescent current (ICCA + ICCB) of 8µA (85°C maximum) and 14µA (125°C maximum)
- Up to 500Mbps support when translating from 1.8 to 3.3V
- VCC isolation feature
- If either VCC input is below 100mV, all I/Os outputs are disabled and become high-impedance
- Ioff supports partial-power-down mode operation
- Latch-up performance exceeds 100mA per JESD 78, Class II
- ESD protection exceeds JESD 22
- 8000V human body model
- 1000V charged-device model
Applications
- Personal electronics
- Enterprise and communications
- Wireless infrastructure
- Building automation
- Electronic point of sale
- Enterprise solid state drive
Block Diagram
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