CY74FCT2245CTQCT

具有三态输出和串联阻尼电阻的八路总线收发器 

Function and Pinout Compatible With FCTand F Logic

25-2 Output Series Resistors to ReduceTransmission-Line Reflection Noise

Edge-Rate Control Circuitry forSignificantly lmproved NoiseCharacteristics

loff Supports Partial-Power-Down ModeOperation

Fully Compatible With TTL input andOutput 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 Current15-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.