Diodes Incorporated — Analog and discrete power solutions
SOT363

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X2 DFN1410 6

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74AVCH1T45

Single Bit Voltage Translator with Bus Hold

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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

Product Specifications

Product Parameters

Function Translator
Type Direction-controlled Voltage Translators
Compliance (Only Automotive supports PPAP) Standard
Channels 1
Family AVC
VCC Min (V) 1.2
VCC Max (V) 3.6
Input Type Standard CMOS
Output Type Push-Pull
Output Current (mA) 12

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site