Texas Instruments CD74HC354E

Overview

CD74HC354E from Texas Instruments is an 8-line to 1-line data selector/multiplexer with transparent latches, three-state complementary outputs, and bus-line driving capability. It operates from 2V to 6V, delivers 18ns typical propagation delay (VCC = 5V, CL = 15pF), supports -55°C to +125°C industrial/military temperature range, and is used in digital bus arbitration and address/data routing in embedded control systems.

For engineers reviewing the CD74HC354E datasheet, CD74HC354E pinout, CD74HC354E application, or CD74HC354E equivalent, this page provides verified functional identity, validated pin assignments, confirmed HC-series CMOS logic behavior, real-world timing constraints (setup/hold, enable/disable times), and precise alternative part comparisons for multiplexer-based system design.

Technical Context

The CD74HC354E implements a dual-function architecture: an 8-input data selector controlled by S0–S2 address lines, and a transparent latch enabled by LE that captures input data when LE is low. Its E input controls data flow-passing through when high and latching on transition to low-enabling synchronized sampling of eight parallel data sources.

Three independent output-enable inputs (OE1, OE2, OE3) drive complementary three-state outputs (Y and Y̅), allowing flexible bus isolation and differential signaling. The device uses standard HC-series CMOS process, delivering balanced rise/fall times, 10 LSTTL fanout on standard outputs, and 15 LSTTL fanout on bus-driver outputs at VCC = 5V.

Key Specifications

Pinout & Package

CD74HC354E is housed in a 20-lead plastic dual in-line package (PDIP), with 0.300-inch body width and through-hole mounting. Pin 10 is GND, pin 20 is VCC, and all inputs are CMOS-compatible with 30% noise margin at VCC = 5V.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-to-1 multiplexer/register applications.

Compared with CD74HC354E, CD74HCT354E offers tighter input threshold compatibility with TTL but sacrifices supply flexibility, while SN74LV4051A trades digital functionality for analog performance-making each suitable only within its defined signal-domain boundary.

Availability

CD74HC354E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, avionics data bus arbitration, and test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC354E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in high-reliability components.

The CD74HC354E belongs to TI's High-Speed CMOS Logic family, designed specifically for robust digital multiplexing, latching, and bus interface applications in harsh-environment systems including aerospace, defense, and industrial automation.

FAQ

What is the exact logic function of CD74HC354E?

The CD74HC354E is an 8-line to 1-line data selector/multiplexer with integrated transparent latches and complementary three-state outputs. It selects one of eight data inputs (D0–D7) using a 3-bit address (S0–S2), latches the selected value when LE is low, and drives complementary outputs (Y/Y̅) controlled independently by OE1–OE3. This makes CD74HC354E suitable for both combinatorial selection and registered data routing in synchronous systems.

Does CD74HC354E support 3.3V operation?

Yes, CD74HC354E fully supports 3.3V operation as part of its 2V–6V supply range. At VCC = 3.3V, it maintains guaranteed logic thresholds (VIH ≥ 2.1V, VIL ≤ 1.1V), 30% noise margin, and specified timing performance-including propagation delay and setup/hold times-per TI's HC-series characterization. This allows direct integration into mixed-voltage 3.3V/5V systems without level shifters.

How do OE1, OE2, and OE3 interact in CD74HC354E?

In CD74HC354E, OE1, OE2, and OE3 are independent active-low enables for the complementary three-state outputs Y and Y̅. Both outputs go into high-impedance state if *any* of OE1, OE2, or OE3 is high. Only when all three are low do Y and Y̅ actively drive complementary logic levels. This triple-enable structure allows fine-grained bus arbitration-e.g., OE1 for primary control, OE2 for backup path, OE3 for diagnostics-without external gating logic.

What is the maximum clock/data frequency supported by CD74HC354E?

CD74HC354E does not operate on a clock; it is asynchronous. Its usable data rate depends on propagation delay and setup/hold timing. With 18ns typical Dn→Y delay (VCC = 5V, CL = 15pF) and minimum pulse widths of 14ns (VCC = 6V), the practical upper limit for reliable address/data toggling is ~30 MHz in well-terminated, low-capacitance layouts. For guaranteed operation across -55°C to +125°C, derate to ≤20 MHz using worst-case 63ns max delay (VCC = 6V, CL = 15pF).

Can CD74HC354E replace CD74HCT354E in a design?

CD74HC354E can replace CD74HCT354E only if the system uses 2V–6V supply and all driving logic meets HC input thresholds (VIH ≥ 1.5V at 2V, ≥3.15V at 4.5V). CD74HCT354E accepts standard TTL inputs (VIH ≥ 2V, VIL ≤ 0.8V) but requires 4.5V–5.5V supply. Swapping them without verifying input compatibility and supply voltage may cause logic misreads or increased static current. Always validate VIH/VIL margins and supply range before substitution.