Description

The CY74FCT257ATQC is a high-speed, low-power, quad 2-to-1 line data selector/multiplexer. It features four 2-input multiplexers with common select and enable inputs. The on-chip termination resistors at the outputs reduce system noise caused by reflections. The CY74FCT257ATQC can replace the CY74FCT257T to reduce noise in an existing design.

Specifications and features

• Function and pinout compatible with FCT and F logic
• 25-ohm output series resistors to reduce transmission-line reflection noise
• Reduced VOH (typically = 3.3 V) version of equivalent FCT functions
• Edge-rate control circuitry for significantly improved noise characteristics
• Ioff supports partial-power-down mode operation
• Matched rise and fall times
• 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)
• 3-state outputs
• 12-mA output sink current and 15-mA output source current
• Edge-triggered D-type inputs
• 250-MHz typical switching rate

Application Scenarios

The CY74FCT257ATQC is ideal for data multiplexing applications in various electronic products such as computers, communication systems, and industrial control systems.

Comparison

• Low power consumption
• Reduced transmission-line reflection noise
• Excellent noise characteristics
• Supports partial-power-down mode operation
• Fast switching rate
• ESD protection exceeds industry standards

• The device is only a replacement to an existing CY74FCT257T and doesn't offer additional features
• May not be compatible with other logic families