Function and Pinout Compatible With FCT
and F Logic
25-Ω Output Series Resistors to Reduce
Transmission-Line Reflection Noise
Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
Ioff Supports Partial-Power-Down Mode
Operation
Fully Compatible With TTL Input and
Output Logic Levels
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
12-mA Output Sink Current
15-mA Output Source Current
3-State Outputs

description
The CY74FCT2245T contains eight noninverting, bidirectional buffers with 3-state outputs intended for
bus-oriented applications. On-chip termination resistors at the outputs reduce system noise caused by
reflections. For this reason, the CY74FCT2245T can replace the CY74FCT245T in an existing design. The
CY74FCT2245T current-sinking capability is 12 mA at the A and B ports.
The transmit/receive (T/R) input determines the direction of data flow through the bidirectional transceiver.
Transmit (active high) enables data from A ports to B ports; receive (active low) enables data from B ports to
A ports. The output-enable (OE) input, when high, disables both the A and B ports by putting them in the
high-impedance state.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.