CY74FCT2245ATPC.B中文资料德州仪器数据手册PDF规格书

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.