Texas Instruments CD4514BEG4

Overview

CD4514BEG4 from Texas Instruments is a 4-bit latched binary-to-decimal decoder/demultiplexer IC with active-high outputs, 16-pin PDIP package, V_DD = 3–18 V supply range, propagation delay t_PLH/t_PHL = 120 ns (at 5 V), and fan-out of 10 TTL loads. It serves as address decoder in memory-mapped I/O systems and enables discrete output selection in industrial control panels.

For engineers reviewing the CD4514BEG4 datasheet, CD4514BEG4 pinout, CD4514BEG4 application, or CD4514BEG4 equivalent, key selection considerations include its latch-enable control architecture, high-voltage CMOS compatibility, output drive capability at 18 V, and absence of internal pull-ups-requiring external termination for open-collector interfacing.

Technical Context

The CD4514BEG4 integrates a 4-bit latch followed by a 1-of-16 decoder, accepting parallel binary inputs (A0–A3) and enabling output selection only when the LATCH ENABLE (LE) input is high. Its outputs are fully buffered, non-inverting, and capable of sourcing/sinking current across the full 3–18 V supply range.

It operates in standard CMOS logic families and interfaces directly with TTL, MOS, and other CD4000-series devices. No internal clock or oscillator is present-the device is purely combinational after latching, with no timing constraints beyond setup/hold on LE relative to data inputs.

Key Specifications

Pinout & Package

CD4514BEG4 is supplied in a 16-lead plastic dual-in-line package (PDIP), JEDEC MS-011 compliant, with 0.300-inch body width and 0.100-inch lead pitch. Pin 1 is index-marked, and the package includes a molded plastic body with tin-lead leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit latched decoder applications.

Compared with CD4514BEG4, CD4515BEE4 offers identical timing and latch behavior but inverted output polarity-requiring redesign of load-side logic. The 74HC4514N delivers faster switching and lower power at 5 V but lacks high-voltage tolerance, limiting use to newer low-voltage platforms.

Availability

CD4514BEG4 is available at Aetrix Electronics and suitable for industrial control panels, legacy memory-mapped I/O subsystems, and programmable logic interface boards requiring stable component supply and long-term obsolescence management.

Supply support for CD4514BEG4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with global manufacturing and distribution infrastructure.

The CD4000-series CMOS logic family-including CD4514BEG4-was designed for robust operation in industrial, automotive, and aerospace environments where wide supply range, radiation tolerance, and thermal stability are essential.

FAQ

What is the primary function of the CD4514BEG4?

The CD4514BEG4 is a 4-bit latched binary-to-1-of-16 decoder with active-high outputs. It accepts four parallel address bits (A0–A3), latches them on the rising edge of the LATCH ENABLE (LE) signal, and asserts exactly one of sixteen outputs (Y0–Y15) corresponding to the decoded value. This makes CD4514BEG4 ideal for static address decoding and discrete output selection in industrial control and legacy computing systems.

Does the CD4514BEG4 require external pull-up resistors on its outputs?

No, the CD4514BEG4 does not require external pull-up resistors because its outputs are fully buffered, active-high CMOS drivers capable of sourcing and sinking current. Each output can drive up to ±4.2 mA at 15 V, enabling direct connection to LEDs, relays, or TTL inputs. External pull-ups are unnecessary unless interfacing with open-collector or NMOS loads-a configuration not supported by CD4514BEG4's output structure.

Can the CD4514BEG4 operate reliably at 12 V supply?

Yes, the CD4514BEG4 is fully specified to operate across 3 V to 18 V, including 12 V. At 12 V, its propagation delay is 70 ns (typical), output drive improves to ±6.8 mA, and input thresholds scale proportionally (V_IH ≥ 8 V, V_IL ≤ 4 V), ensuring robust noise immunity. This 12 V capability is a key differentiator of CD4514BEG4 versus newer 5 V-only logic families like 74HC4514N.

How does the LATCH ENABLE (LE) pin affect timing behavior in CD4514BEG4?

The LATCH ENABLE (LE) pin controls data capture: when LE is high, A0–A3 inputs are transparently passed to the internal latch; on the rising edge of LE, the current input state is frozen and decoded. While LE is low, output states remain held regardless of input changes-preventing glitches during address bus transitions. This behavior is fundamental to CD4514BEG4's role in stable peripheral selection and is documented with 50 ns minimum LE pulse width and 30 ns setup/hold requirements.

Is the CD4514BEG4 pin-compatible with the CD4515B series?

The CD4514BEG4 and CD4515B share identical pinout, supply ratings, timing, and latch architecture-but differ in output polarity: CD4514BEG4 has active-high outputs (Y0–Y15), while CD4515B has active-low outputs (Y0̅–Y15̅). They are not functionally interchangeable without modifying downstream logic. Therefore, CD4514BEG4 cannot serve as a drop-in replacement for CD4515B in existing designs relying on low-true enable signals.