Texas Instruments CD4515BEG4

Overview

CD4515BEG4 from Texas Instruments is a 4-bit latched binary-to-decimal decoder/demultiplexer in a 16-pin plastic DIP package, operating from 3 V to 18 V supply, with typical propagation delay of 120 ns at 5 V and 70 ns at 15 V, used for address decoding and signal routing in legacy CMOS logic systems.

For engineers reviewing the CD4515BEG4 datasheet, CD4515BEG4 pinout, CD4515BEG4 application, or CD4515BEG4 equivalent, key selection factors include its active-high enable (EN), latch-controlled input storage, decimal output drive capability, and compatibility with CD4000-series logic voltage levels and timing.

Technical Context

The CD4515BEG4 integrates four address inputs (A0–A3), a latch enable (LE), an enable (EN), and ten decoded outputs (Y0–Y9), where outputs are latched on rising edge of LE and enabled only when EN is high. It uses standard CMOS silicon-gate technology with buffered outputs.

It functions as a synchronous address decoder: input data is captured on LE transition, held stable during EN assertion, and drives one of ten mutually exclusive high-true outputs. No internal pull-ups or open-drain configuration - all outputs are push-pull CMOS.

Key Specifications

Pinout & Package

CD4515BEG4 is supplied in a 16-lead plastic dual-in-line package (PDIP) per JEDEC MS-011, with 0.300-inch body width, 0.100-inch lead pitch, and through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4515BEG4, CD4514BE provides broader decode coverage but lacks decimal-only output mapping and requires PCB redesign, while MC14515B delivers identical functionality and pinout for seamless substitution in existing designs.

Availability

CD4515BEG4 is available at Aetrix Electronics and suitable for industrial control panels, legacy instrumentation displays, and programmable logic controller I/O expansion requiring stable component supply and long-term obsolescence management.

Supply support for CD4515BEG4 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 ICs with broad industrial and aerospace heritage.

The CD4515BEG4 belongs to TI's CD4000-series CMOS logic family, designed for robust, wide-supply-voltage digital control in environments where reliability and temperature tolerance outweigh speed requirements.

FAQ

What is the function of the LE pin on the CD4515BEG4?

The LE (Latch Enable) pin on the CD4515BEG4 is an active-high, edge-triggered control that captures the current states of address inputs A0–A3 on its rising edge. Once latched, those values remain held internally regardless of subsequent changes to A0–A3, ensuring stable Y0–Y9 outputs during EN assertion. This behavior is essential for eliminating glitches caused by asynchronous address transitions.

Does the CD4515BEG4 support 3.3 V operation?

Yes, the CD4515BEG4 supports 3.3 V operation within its specified 3 V to 18 V supply range. At 3.3 V, it meets all AC and DC specifications including input thresholds (V_IL ≤ 1.1 V, V_IH ≥ 2.2 V) and output drive (≥ ±1.5 mA), making it compatible with mixed-voltage systems where 3.3 V microcontrollers interface with legacy CMOS logic.

How does the CD4515BEG4 differ from the CD4514B?

The CD4515BEG4 is a binary-to-decimal decoder with ten outputs (Y0–Y9), whereas the CD4514B is a binary-to-hexadecimal decoder with sixteen outputs (Y0–Y15). They share identical pinout for shared signals (A0–A3, LE, EN, V_DD, V_SS), but CD4515BEG4 omits Y10–Y15 and maps only valid BCD codes (0–9), rejecting invalid inputs (10–15) with all outputs low.

Can the CD4515BEG4 drive LEDs directly?

Yes, the CD4515BEG4 can drive standard 5 mm LEDs directly when operated at ≥ 9 V supply, delivering up to 3.5 mA per output - sufficient for low-current indicator LEDs. At 5 V, output current drops to ~2.2 mA; for higher brightness or multiple LEDs, an external transistor driver is recommended to avoid exceeding total package power dissipation limits.

Is the CD4515BEG4 RoHS compliant?

The CD4515BEG4 is not RoHS compliant in its original G4 suffix variant, as it uses leaded plastic DIP packaging conforming to legacy JEDEC MS-011 standards. Texas Instruments discontinued RoHS-compliant versions of this specific suffix; modern alternatives like the MC14515B may offer RoHS-compliant variants depending on date code and distributor stock.