74AVCH1T45数据手册集成电路（IC）的转换器电平移位器规格书PDF

描述 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.

特性 Features

•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

应用 Application

•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