SN74HC244N / SN74HC245N / SN74HC373N / SN74HC374N DIP-20 Bus Logic ICs – Pack of 5

SN74HC244N / SN74HC245N / SN74HC373N / SN74HC374N DIP-20 Bus Logic ICs – Pack of 5

These four 74HC series DIP-20 bus interface ICs are the essential building blocks for data bus buffering, level shifting, and data latching in digital systems. All four are octal (8-bit) devices with tri-state outputs for bus sharing, and all operate from 2V to 6V with ±25mA output drive. Together they cover the complete range of bus interface functions: unidirectional buffering, bidirectional transceivers, transparent latches, and edge-triggered registers.

IC Descriptions

SN74HC244N – Octal Buffer / Line Driver (Non-Inverting, 3-State)

• 8 non-inverting buffers with tri-state outputs
• Two 4-bit groups with independent output enable (̅O̅E̅1, ̅O̅E̅2)
• Use cases: Bus driving, signal isolation, address bus buffering, GPIO protection
• Unidirectional – data flows from A to Y only

SN74HC245N – Octal Bus Transceiver (Non-Inverting, 3-State)

• 8 bidirectional buffers with tri-state outputs
• Direction control (DIR): HIGH = A→B, LOW = B→A
• Output enable (̅O̅E̅): active LOW
• Use cases: Bidirectional data bus buffering, 3.3V↔5V level shifting, bus isolation
• The most commonly used bus transceiver in digital systems

SN74HC373N – Octal Transparent D-Type Latch (3-State)

• 8 D-type latches with common latch enable (LE) and output enable (̅O̅E̅)
• Transparent when LE is HIGH – outputs follow inputs
• Latches data when LE goes LOW – outputs hold last state
• Use cases: Address latching in multiplexed bus systems, data bus demultiplexing

SN74HC374N – Octal D-Type Flip-Flop (3-State, Positive Edge-Triggered)

• 8 D-type flip-flops with common clock (CLK) and output enable (̅O̅E̅)
• Data captured on rising clock edge – synchronous operation
• Use cases: Output port registers, pipeline registers, synchronous data bus latching
• Preferred over 74HC373 for synchronous systems (clock-edge triggered vs level-sensitive)

Common Specifications

• Package: DIP-20 (through-hole, 2.54mm pitch)
• Supply Voltage: 2V – 6V
• Output Drive Current: ±25mA per pin
• Propagation Delay: ~8–12ns (typical at 4.5V)
• Operating Temperature: −40°C to +125°C

Package Contents

• 5 × DIP-20 bus logic ICs (select variant: SN74HC244N, SN74HC245N, SN74HC373N, or SN74HC374N)

The complete 74HC bus interface toolkit – buffers, transceivers, latches, and registers in DIP-20 for data bus buffering, level shifting, and synchronous data capture in digital systems.

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