1. General description
The 74LVC1T45; 74LVCH1T45 are single bit, dual supply transceivers with 3-state outputs
that enable bidirectional level translation. They feature two 1-bit input-output ports (A and B), 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 A and DIR
are referenced to VCC(A) and pin B is referenced to VCC(B). A HIGH on DIR allows transmission
from A to B and a LOW on DIR allows transmission from B to A.
The devices are fully specified for partial power-down applications using IOFF. The IOFF
circuitry disables the output, preventing any damaging backflow current through the device
when it is powered down. In suspend mode when either VCC(A) or VCC(B) are at GND level,
both A port and B port are in the high-impedance OFF-state.
Active bus hold circuitry in the 74LVCH1T45 holds unused or floating data inputs at a valid logic
level.
2. Features and benefits
• Wide supply voltage range:
• VCC(A): 1.2 V to 5.5 V
• VCC(B): 1.2 V to 5.5 V
• High noise immunity
• Maximum data rates:
• 420 Mbps (3.3 V to 5.0 V translation)
• 210 Mbps (translate to 3.3 V))
• 140 Mbps (translate to 2.5 V)
• 75 Mbps (translate to 1.8 V)
• 60 Mbps (translate to 1.5 V)
• Suspend mode
• Latch-up performance exceeds 100 mA per JESD 78 Class II
• ±24 mA output drive (VCC = 3.0 V)
• Inputs accept voltages up to 5.5 V
• Low power consumption: 16 μA maximum ICC
• IOFF circuitry provides partial Power-down mode operation
• Complies with JEDEC standards:
• JESD8-7 (1.2 V to 1.95 V)
• JESD8-5 (1.8 V to 2.7 V)
• JESD8C (2.7 V to 3.6 V)
• JESD36 (4.5 V to 5.5 V)
• ESD protection:
• HBM JESD22-A114F Class 3A exceeds 4000 V
• CDM JESD22-C101E exceeds 1000 V
• Multiple package options
• Specified from -40 °C to +85 °C and -40 °C to +125 °C