Datasheet Diodes 74LVCH2T45 — 数据表

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
 …