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
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
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,
the roles of the ports are reversed when the direction pin is asserted
LOW.
( Top View )
The tri-state (Ioff) feature places all port pins in a high impedance
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.
VCC(A)
1
8
VCC(B)
1A
2
7
1B
2A
3
6
2B
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
previous logic level therefore a valid logic level is always present
eliminating the need for additional resistors for unused or
disconnected inputs.
X2-DFN1210-8
X2-DFN1410-8
Features
Applications
Wide Supply Voltage Range:
VCC(A): from 1.2V to 5.5V
VCC(B): from 1.2V to 5.5V
± 24mA Output Drive at 3.3V
CMOS Low Power Consumption 16µA Maximum ICC
High Noise Immunity
IOFF Supports Partial-Power-Down Mode Operation
IOFF Controlled by Either VCC Being at 0V
Inputs Accept up to 5.5V
Maximum data rates:
420Mbps (3.3V to 5V translation)
210Mbps (translate to 3.3V)
140Mbps (translate to 2.5V)
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 -40°C to +85°C and -40°C to +125°C
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.
https://www.diodes.com/quality/product-definitions/
Notes:
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 ROM
TV, DVD, DVR, Set-Top Box
Personal Navigation / GPS
MP3 Players, Cameras, Video Recorders
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain
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