SN74285N 4-bit by 4-bit Parallel Binary Multiplier IC DIP-16

Description

SN74285N 4-bit by 4-bit
Parallel Binary Multiplier IC
DIP-16

These high-speed TTL circuits perform positive-logic multiplication of two 4-bit binary words to produce an 8-bit product. Designed for high-performance, parallel multiplication uses, the device generates the eight-bit binary product with a typical delay of about 40 ns, making it suitable as a fast arithmetic building block in digital systems.

The basic 4×4 multiplier is intended to be used as a fundamental building block for larger multipliers: multiple 4×4 devices can be combined to form 8×8, 16×16 (via partial-product summation such as Wallace trees), and other N×M multipliers. The datasheet illustrates how chaining these elements and using carry-save adders produces wider products with minimal added delay.

Characterized for standard TTL environments, the part is fully compatible with TTL logic families and includes diode-clamped inputs to simplify system design. Pinouts and timing diagrams are provided so designers can integrate the device into arithmetic units, multiply-accumulate structures, or custom ALU arrangements.

Features:

Fast multiplication of two 4-bit binary numbers 8-bit product in ~40 ns.

Expandable for N-bit × n-bit applications (examples: 16-bit product in ~70 ns, 32-bit in ~103 ns).

Fully compatible with most TTL circuits.

Diode-clamped inputs to simplify system design.

Specifications:

Specification

Value (
SN74285N
)

Function:

4-bit × 4-bit parallel binary multiplier

Logic family:

High-speed TTL

Supply voltage (VCC):

4.75 V to 5.25 V (nominal 5 V)

Absolute maximum VCC:

7 V

Input high voltage (VIH):

Minimum 2.0 V

Input low voltage (VIL):

Maximum 0.8 V

Output high current (IOH):

40 µA

Output low current (IOL):

Up to 16 mA

Output low voltage (VOL):

0.45 V (max at 16 mA)

Typical propagation delay:

~40 ns (input to product output)

Enable to output delay:

~20–30 ns

Supply current (ICC):

92 mA to 130 mA

Operating temperature range:

0 °C to +70 °C

Package type:

DIP-16 (N-package)

Number of output bits:

8-bit binary product

Pinout:

Applications:

High-Speed Digital Signal Processing.

Arithmetic Logic Unit (ALU) Expansion.

Microprocessor Based Systems (Hardware Multiplier).

Instrumentation and Measurement Circuits.

Digital Filter Design.

Process Control Logic.

Video and Graphics Data Manipulation.

Minicomputer and Peripheral Interface.

Package Contents:

1x
SN74285N 4-bit by 4-bit Parallel Binary Multiplier IC DIP-16

Datasheet