1 Features
• Output voltage translation tracks VCC
• Supports mixed-mode signal operation on all data
I/O ports
– 5V input down to 3.3V output level shift with
3.3V VCC
– 5V/3.3V input down to 2.5V output level shift
with 2.5V VCC
• 5V tolerant I/Os with device powered up or
powered down
• Bidirectional data flow with near-zero propagation
delay
• Low ON-state resistance (ron) characteristics (ron =
5Ω typ)
• Low input/output capacitance minimizes loading
(Cio(OFF) = 5pF typ)
• Data and control inputs provide undershoot clamp
diodes
• Low power consumption (ICC = 20μA max)
• VCC operating range from 2.3V to 3.6V
• Data I/Os support 0V to 5V signaling levels (0.8V,
1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V)
• Control inputs can be driven by TTL or 5V/3.3V
CMOS outputs
• Ioff supports partial-power-down mode operation
• Latch-up performance exceeds 250mA per JESD
17
• ESD performance tested per JESD 22
– 2000V human-body model (A114-B, Class II)
– 1000V charged-device model (C101)

2 Applications
• Supports digital applications:
– Level translation
– USB interface
– Memory interleaving
– Bus isolation
• Designed for low-power portable equipment

3 Description
The SN74CB3T3253 is a high-speed TTL-compatible
FET multiplexer/demultiplexer with low ON-state
resistance (ron), allowing for minimal propagation
delay. The device fully supports mixed-mode signal
operation on all data I/O ports by providing voltage
translation that tracks VCC. The SN74CB3T3253
supports systems using 5V TTL, 3.3V LVTTL, and
2.5V CMOS switching standards, as well as userdefined
switching levels (see Typical DC Voltage-
Translation Characteristics).
This device is fully specified for partial-power-down
applications using Ioff. The Ioff feature establishes
that damaging current does not backflow through the
device when it is powered down. The device has
isolation during power off.