Professional IC Distribution & Technical Solutions

The 74F656AN is a high-speed, low-power octal bus transceiver and register manufactured by Signetics. Below are its key specifications, descriptions, and features:

Manufacturer: Signetics

Part Number: 74F656AN

Technology: 74F (Fast TTL)

Package: 24-pin DIP (Dual In-line Package)

Description:

The 74F656AN is an 8-bit bidirectional transceiver with transparent and latched modes. It allows data transfer between two buses in both directions while providing storage capability via internal registers.

Key Features:

• Octal (8-bit) bidirectional bus transceiver with registers
• Two operating modes:
• Transparent mode (data passes through)
• Latched mode (data is stored in registers)
• High-speed operation (typical propagation delay: 5.5 ns)
• TTL-compatible inputs and outputs
• 3-state outputs for bus-oriented applications
• Low power consumption (compared to standard TTL)
• Wide operating voltage range: 4.5V to 5.5V
• Output drive capability: 15 mA sink / 24 mA source

Applications:

• Bus interfacing in microprocessor/microcontroller systems
• Data buffering and storage
• Communication systems
• General-purpose digital logic circuits

Pin Configuration (24-pin DIP):

• A0–A7: Side A data bus
• B0–B7: Side B data bus
• DIR: Direction control (determines data flow)
• OE (Output Enable): Enables/disables outputs
• SAB, SBA: Select lines for transparent/latched mode

Electrical Characteristics:

• Supply Voltage (VCC): 5V ±10%
• Operating Temperature Range: 0°C to +70°C
• Input/Output Logic Levels: TTL-compatible

This device is designed for high-performance digital systems requiring bidirectional data transfer with optional latching capability.

Would you like additional details on timing diagrams or truth tables?