The 74AVCH1T45DW-7 is a single bit, dual supply transceiver with 3-state outputs suitable for transmitting a single logic bit across different voltage domains. The 74AVCH1T45DW-7 is a variant of the 74AVC1T45 that includes a bus hold feature at each input. The A input/output pin is designed to track VCCA while the B input/output tracks VCCB. This arrangement allows for universal low-voltage translation between any voltages from 1.2V to 3.6V. The Direction pin (DIR) controls the direction of the transceiver and in a logic voltage related to VCCA. When a high logic level is applied to DIR the A pin becomes an input and the B pin becomes the output. Conversely the roles of A and B are reversed when DIR is asserted low.
The 3-state feature occurs when either of the power supply voltages are zero. This is also an Ioff feature and allows for the output to remain in a high impedance state with both power supplies at 0V preventing damaging backflow currents and providing power down electrical isolation up to 3.6 V as not to interfere with any logic activity on pin A or B.
The bus hold feature maintains the previous logic level therefore a valid logic level is always present eliminating the need for additional resistors for an unused or disconnected inputs.
Feature
- Wide Supply Voltage Range:
- VCC(A): from 1.2V to 3.6V
- VCC(B): from 1.2V to 3.6V
- ± 12mA Output Drive at 3.3V
- High Noise Immunity -- (100mV hysteresis typical)
- IOFF Supports Partial-Power-Down Mode Operation
- IOFF controlled by either VCC being at 0 V
- Inputs accept up to 4.6V
- ESD Protection Exceeds JESD 22
- 200-V Machine Model (A115)
- 2000-V Human Body Model (A114)
- 1000 V Charged Device Model ( C101)
- Latch-Up Exceeds 100mA per JESD 78, Class II
- X2-DFN1409-6 package designed as a direct replacement for chip scale packaging.
- Totally Lead-Free & Fully RoHS Compliant
- Halogen and Antimony Free. “Green” Device
Applications
- Voltage Level Translation
- Well suited to join logic types operating at different voltages
- Power Down Signal Isolation
- If either voltage domain is turned off the signal is isolated and there is no loading on signal lines
- Wide array of products such as:
- Cell Phones, Tablets, E-Readers
- PCs, Notebooks, Netbooks, Ultrabooks
- Networking, Routers, Gateways
- Computer Peripherals, Hard Drives, CD/DVD ROMs
- TVs, DVDs, DVRs, Set Top Boxes
- Personal Navigation / GPS
- MP3 players, Cameras, Video Recorders
