74LVCH2T45 DUAL BIT DUAL POWER SUPPLY TRANSLATING TRANSCEIVER WITH 3 STATE OUTPUTS Description Pin Assignments The 74LVCH2T45 is a dual-bit, dual-supply transceiver with tri-state outputs suitable for transmitting two logic bits across different voltage ( ) Top View domains. The direction pin (DIR) and Port A, consisting of pins 1A and 2A, have logic levels in relation to VCC(A) while port B, consisting of pins 1B and 2B have logic levels related to VCC(B). This arrangement 1 (B) (A) 8 VCC VCC allows for universal low-voltage translation between any voltages from 1.2V to 5.5V. When a HIGH logic level is applied to the direction pin, port A pins become inputs and port B pins are outputs. Conversely, 1A 1B 2 7 the roles of the ports are reversed when the direction pin is asserted LOW. The tri-state (Ioff) feature places all port pins in a high impedance 2A 3 6 2B state when either power supply is at 0V, which prevents and damages backflow currents and provides power-down electrical isolation up to 5.5V as not to interfere with any logic activity on either of the ports. GND 4 5 DIR The 74LVCH2T45 is a variant of the 74LVC2T45 that includes a bus hold feature at each input. The bus hold feature maintains the X2-DFN1210-8 previous logic level therefore a valid logic level is always present eliminating the need for additional resistors for unused or X2-DFN1410-8 disconnected inputs. Features Applications Wide Supply Voltage Range: Voltage Level Translation VCC(A): from 1.2V to 5.5V Well-Suited to Join Logic Types Operating at Different Voltages VCC(B): from 1.2V to 5.5V Power-Down Signal Isolation 24mA Output Drive at 3.3V If Either Voltage Domain is Turned Off the Signal is Isolated and CMOS Low Power Consumption 16A Maximum ICC There is No Loading on Signal Lines High Noise Immunity Wide Array of Products, such as: IOFF Supports Partial-Power-Down Mode Operation Cell Phones, Tablets, E-Readers IOFF Controlled by Either VCC Being at 0V PCs, Notebooks, Netbooks, Ultrabooks Inputs Accept up to 5.5V Networking, Routers, Gateways Maximum data rates: Computer Peripherals, Hard Drives, CD/DVD ROM 420Mbps (3.3V to 5V translation) TV, DVD, DVR, Set-Top Box 210Mbps (translate to 3.3V) Personal Navigation / GPS 140Mbps (translate to 2.5V) MP3 Players, Cameras, Video Recorders 75Mbps (translate to 1.8V) 60Mbps (translate to 1.5V) ESD Protection Exceeds JESD 22 4000-V Human Body Model (A114) 1000 V Charged Device Model (C101) Latch-up Exceeds 100mA per JESD 78, Class I Specified from -40C to +85C and -40C to +125C Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. 74LVCH2T45 Pin Descriptions Pin Pin Name Function VCC(A) 1 Supply for I/O Pin A Reference for DIR 1A 2 Data Input/Output 2A 3 Data Input/Output GND 4 Ground DIR 5 Direction Control 2B 6 Data Input/Output 1B 7 Data Input/Output VCC(B) 8 Supply for I/O Pin B Logic Diagram DIR 1A 1B 2A 2B V (A) V (B) CC CC Function Tables Input Operation DIR (Direction Pin) L B Data to A Output H A Data to B Output Inputs Outputs A B DIR A B Note 4 L L L Note 4 Note 4 H L H Note 4 L Note 4 H Note 4 L H Note 4 H Note 4 H Note: 4. Pin condition not applicable as defined by DIR. 2 of 16 74LVCH2T45 January 2021 Diodes Incorporated www.diodes.com Document number: DS43361 Rev. 1 - 2