74LVC2T45DC Product Information
General Description
The 74LVC2T45DC is a dual-bit, dual-supply translating transceiver with 3-state outputs that enables bidirectional level translation. It has two 2-bit input-output ports (nA and nB), a direction control input (DIR), and dual supply pins (VCC(A) and VCC(B)). Both VCC(A) and VCC(B) can be supplied at any voltage between 1.2 V and 5.5 V, making the device suitable for translating between any of the low voltage nodes (1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V). Pins nA and DIR are referenced to VCC(A), and pins nB are referenced to VCC(B). A HIGH on DIR allows transmission from nA to nB, and a LOW on DIR allows transmission from nB to nA. The device is fully specified for partial power-down applications using IOFF, which disables the output to prevent damaging backflow current when powered down.
Ordering Information
•Package Type: 74LVC2T45DC
•Temperature Range: -40 °C to +125 °C
•Package Description: VSSOP8 plastic very thin shrink small outline package; 8 leads; body width 2.3 mm
Marking
•Marking Code: V45
Functional Diagram
•Logic Symbol:CopyDIR 1B 2B 7 6 1A 2A 5 2 3 VCC(A) VCC(B)
•IEC Logic Symbol:CopyDIR 1B 2B 1A 2A VCC(A) VCC(B)
•Logic Diagram:CopyDIR 1B 2B 1A 2A VCC(A) VCC(B)
Pinning Information
Pin Configuration
•VCC(A): Supply voltage A (port A and DIR)
•1A, 2A: Data input or output
•GND: Ground (0 V)
•DIR: Direction control
•2B, 1B: Data input or output
•VCC(B): Supply voltage B (port B)
Pin Description

SymbolPinDescription
VCC(A)1Supply voltage A (port A and DIR)
1A2Data input or output
2A3Data input or output
GND4Ground (0 V)
DIR5Direction control
2B6Data input or output
1B7Data input or output
VCC(B)8Supply voltage B (port B)

Functional Description
•Supply Voltage: VCC(A), VCC(B) = 1.2 V to 5.5 V
•Direction Control:DIR = LOW: Transmission from nB to nADIR = HIGH: Transmission from nA to nB
•Suspend Mode: When either VCC(A) or VCC(B) is at GND level, the device goes into suspend mode, and both A port and B port are in the high-impedance OFF-state.
Limiting Values
•Supply Voltage (VCC(A), VCC(B)): -0.5 V to +6.5 V
•Input Clamping Current (IIK): ±50 mA (VI < 0 V)
•Input Voltage (VI): -0.5 V to +6.5 V
•Output Clamping Current (IOK): ±50 mA (VO < 0 V)
•Output Voltage (VO):Active mode: -0.5 V to VCCO + 0.5 VSuspend or 3-state mode: -0.5 V to +6.5 V
•Output Current (IO): ±50 mA (VO = 0 V to VCCO)
•Supply Current (ICC): 100 mA
•Ground Current (IGND): -100 mA
•Storage Temperature (Tstg): -65 °C to +150 °C
•Total Power Dissipation (Ptot): 250 mW (Tamb = -40 °C to +125 °C)
Recommended Operating Conditions
•Supply Voltage (VCC(A), VCC(B)): 1.2 V to 5.5 V
•Input Voltage (VI): 0 V to 5.5 V
•Output Voltage (VO): 0 V to VCCO
•Ambient Temperature (Tamb): -40 °C to +125 °C
•Input Transition Rise and Fall Rate (Δt/ΔV):VCCI = 1.2 V: 20 ns/VVCCI = 1.4 V to 1.95 V: 20 ns/VVCCI = 2.3 V to 2.7 V: 20 ns/VVCCI = 3 V to 3.6 V: 10 ns/VVCCI = 4.5 V to 5.5 V: 5 ns/V
Static Characteristics
•HIGH-level Output Voltage (VOH):V = VIH or VIL; IO = -3 mA; VCCO = 1.2 V → VOH = 1.09 V
•LOW-level Output Voltage (VOL):V = VIH or VIL; IO = 3 mA; VCCO = 1.2 V → VOL = 0.07 V
•Input Leakage Current (II):DIR input; VI = 0 V to 5.5 V; VCCI = 1.2 V to 5.5 V → II = ±1 μA
•Bus Hold LOW Current (IBHL):A or B port; V = 0.42 V; VCCI = 1.2 V → IBHL = 19 μA
•Bus Hold HIGH Current (IBHH):A or B port; V = 0.78 V; VCCI = 1.2 V → IBHH = -19 μA
•Bus Hold LOW Overdrive Current (IBHLO):A or B port; VCCI = 1.2 V → IBHLO = 19 μA
•Bus Hold HIGH Overdrive Current (IBHHO):A or B port; VCCI = 1.2 V → IBHHO = -19 μA
•OFF-state Output Current (IOZ):A or B port; VO = 0 V or VCCO; VCCO = 1.2 V to 5.5 V → IOZ = ±1 μA
•Power-off Leakage Current (IOFF):A port; VI or VO = 0 V to 5.5 V; VCC(A) = 0 V; VCC(B) = 1.2 V to 5.5 V → IOFF = ±1 μAB port; VI or VO = 0 V to 5.5 V; VCC(B) = 0 V; VCC(A) = 1.2 V to 5.5 V → IOFF = ±1 μA
•Input Capacitance (CI):DIR input; VI = 0 V or 3.3 V; VCC(A) = VCC(B) = 3.3 V → CI = 2.2 pF
•Input/Output Capacitance (CI/O):A and B port; Suspend mode; VO = 3.3 V or 0 V; VCC(A) = VCC(B) = 3.3 V → CI/O = 6.0 pF
Dynamic Characteristics
Typical Dynamic Characteristics at VCC(A) = 1.2 V and Tamb = 25 °C
•Propagation Delay (tpd):A to B: 10.6 ns (VCC(B) = 1.2 V), 8.1 ns (VCC(B) = 1.5 V), 7.0 ns (VCC(B) = 1.8 V), 5.8 ns (VCC(B) = 2.5 V), 5.3 ns (VCC(B) = 3.3 V), 5.