1. General description

The 74AVCH4T245 is a 4-bit, dual supply transceiver that enables bidirectional level

translation. The device can be used as two 2-bit transceivers or as a 4-bit transceiver. It

features two 2-bit input-output ports (nAn and nBn), a direction control input (nDIR), a

output enable input (nOE) and dual supply pins (VCC(A) and VCC(B)). Both VCC(A) and

VCC(B) can be supplied at any voltage between 0.8 V and 3.6 V making the device suitable

for translating between any of the low voltage nodes (0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V and

3.3 V). Pins nAn, nOE and nDIR are referenced to VCC(A) and pins nBn are referenced to

VCC(B). A HIGH on nDIR allows transmission from nAn to nBn and a LOW on nDIR allows

transmission from nBn to nAn. The output enable input (nOE) can be used to disable the

outputs so the buses are effectively isolated.

The device is 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 nAn and nBn outputs are in the high-impedance OFF-state. The bus hold

circuitry on the powered-up side always stays active.

The 74AVCH4T245 has active bus hold circuitry which is provided to hold unused or

floating data inputs at a valid logic level. This feature eliminates the need for external

pull-up or pull-down resistors.

2. Features and benefits

 Wide supply voltage range:

 VCC(A): 0.8 V to 3.6 V

 VCC(B): 0.8 V to 3.6 V

 Complies with JEDEC standards:

 JESD8-12 (0.8 V to 1.3 V)

 JESD8-11 (0.9 V to 1.65 V)

 JESD8-7 (1.2 V to 1.95 V)

 JESD8-5 (1.8 V to 2.7 V)

 JESD8-B (2.7 V to 3.6 V)

 ESD protection:

 HBM JESD22-A114E Class 3B exceeds 8000 V

 MM JESD22-A115-A exceeds 200 V

 CDM JESD22-C101C exceeds 1000 V

 Maximum data rates:

 380 Mbit/s ( 1.8 V to 3.3 V translation)

 200 Mbit/s ( 1.1 V to 3.3 V translation)

 200 Mbit/s ( 1.1 V to 2.5 V translation)

 200 Mbit/s ( 1.1 V to 1.8 V translation)

 150 Mbit/s ( 1.1 V to 1.5 V translation)

 100 Mbit/s ( 1.1 V to 1.2 V translation)

 Suspend mode

 Bus hold on data inputs

 Latch-up performance exceeds 100 mA per JESD 78 Class II

 Inputs accept voltages up to 3.6 V

 IOFF circuitry provides partial Power-down mode operation

 Multiple package options

 Specified from 40 C to +85 C and 40 C to +125 C

74AVCH4T245D属于集成电路（IC） > 缓冲器，驱动器，接收器，收发器。安世半导体(中国)有限公司制造生产的74AVCH4T245D缓冲器，驱动器，接收器，收发器逻辑缓冲器、驱动器、接收器和收发器允许隔离对某个电路的逻辑信号的访问，以用于另一电路。缓冲器将其输入信号（不变或反相）传递到其输出，并可能用于清除弱信号或驱动负载。在布尔逻辑仿真器中，缓冲器主要用于增加传播延迟。逻辑接收器和收发器允许在数据总线之间进行隔离通信。