Texas Instruments SN74AXCH1T45DTQR
- Part Number:
- SN74AXCH1T45DTQR
- Manufacturer:
- Texas Instruments
- Ventron No:
- 6406783-SN74AXCH1T45DTQR
- Description:
- Single-bit dual-supply bus transceiver
- Datasheet:
- sn74axch1t45
- Technology familyAXC
- ApplicationsGPIO
- Bits (#)1
- High input voltage (min) (V)0.455
- High input voltage (max) (V)3.6
- Vout (min) (V)0.65
- Vout (max) (V)3.6
- Data rate (max) (MBits)500
- IOH (max) (mA)-12
- IOL (max) (mA)12
- Supply current (max) (μA)14
- FeaturesBus-hold
- Input typeStandard CMOS
- Output type3-State
- RatingCatalog
- Operating temperature range (°C)-40 to 125
The SN74AXCH1T45 is a single-bit noninverting bus transceiver that uses two individually configurable power-supply rails. The device is operational with both VCCA and VCCB supplies as low as 0.65 V. The A port is designed to track VCCA, which accepts any supply voltage from 0.65 V to 3.6 V. The B port is designed to track VCCB, which also accepts any supply voltage from 0.65 V to 3.6 V. Additionally the SN74AXCH1T45 is compatible with a single-supply system.
The DIR pin determines the direction of signal propagation. With the DIR pin configured HIGH, translation is from Port A to Port B. With DIR configured LOW, translation is from Port B to Port A. The DIR pin is referenced to VCCA, meaning that its logic-high and logic-low thresholds track with VCCA.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. If a supply is present for VCCA or VCCB, the bus-hold circuitry always remains active on the A or B inputs respectively, independent of the state of the direction control pin.
This device is fully specified for partial-power-down applications using the Ioff current. The Ioff protection circuitry 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 VCC isolation feature ensures that if either VCCA or VCCB is less than 100 mV, both I/O ports enter a high-impedance state by disabling their outputs.
Glitch-free power supply sequencing allows either supply rail to be powered on or off in any order while providing robust power sequencing performance.
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