74AVCH1T45

Description

The 74AVCH1T45 is a single bit, dual supply transceiver with 3-state outputs suitable for transmitting a single logic bit across different voltage domains. The 74AVCH1T45 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(s)

• 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

Application(s)

• 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