Level conversion method

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Level conversion method [Copy link]

1. Bus Transceiver:
Common devices: SN74LVTH245A (8-bit), SN74LVTH16245A (16-bit)
Features: 3.3V power supply, direction control required,
delay: 3.5ns, drive: -32/64mA,
input tolerance: 5V
Application: data, address and control bus driver
2. Bus switch (Bustch)
Common devices: SN74CBTD3384 (10-bit), SN74CBTD16210 (20-bit)
Features: 5V power supply, no direction control required
Delay: 0.25ns, no increase in driving capability
Application: Suitable for applications with flexible signal direction and single load, such as McBSP and other peripheral signal level conversion
3. 2-to-1 switch (1 of 2 Multiplexer)
Common devices: SN74CBT3257 (4-bit), SN74CBT16292 (12-bit)
Features: 2-to-1, 5V power supply, no direction control required
Delay: 0.25ns, no increase in driving capability
Application: Suitable for applications with multiplexed signals and level conversion, such as McBSP
4 with dual multiplexing, CPLD
3.3V power supply, but the input tolerance is 5V, and the delay is large: >7ns, suitable for a small number of input signals with low delay requirements
5, resistor voltage divider
10KΩ and 20KΩ series voltage divider, 5V×20÷(10＋20)≈3.3V