Texas Instruments JBP28L22MJ

Overview

JBP28L22MJ from Texas Instruments is a dual 4-bit binary counter with asynchronous reset, packaged in a 20-pin CDIP (Ceramic Dual In-line Package), operating across -55°C to +125°C, featuring TTL-compatible inputs and outputs, and designed for high-reliability military/aerospace timing control applications.

For engineers reviewing the JBP28L22MJ datasheet, JBP28L22MJ pinout, JBP28L22MJ application, or JBP28L22MJ equivalent, this device serves as a radiation-tolerant, extended-temperature counter for mission-critical sequencing, clock division, and event counting where latch-up immunity and long-term parametric stability are required.

Technical Context

The JBP28L22MJ implements two independent 4-bit synchronous binary counters, each with separate clock, clear, and enable inputs. It uses bipolar TTL circuitry with Schottky-clamped transistors to achieve propagation delays of 25 ns (max) at VCC = 5 V and TA = 25°C.

It supports cascading via ripple-clock output (RCO) and carry-in (CI) terminals, enabling modular 8-bit or wider counting. The device requires no external pull-ups and maintains valid logic levels over its full military temperature range without derating.

Key Specifications

Pinout & Package

Package: 20-pin Ceramic Dual In-line Package (CDIP), J drawing, hermetically sealed, lead-finished per TI specification, MSL N/A (non-moisture-sensitive).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar binary counter applications.

Compared with SN54LS161J and 5962-8763301XA, the JBP28L22MJ uniquely delivers dual independent counters with Class K qualification and integrated cascade logic in one hermetic package-enabling compact, radiation-resilient timing designs without layout or firmware compromise.

Availability

JBP28L22MJ is available at Aetrix Electronics and suitable for spacecraft telemetry systems, avionics watchdog circuits, and nuclear instrumentation requiring stable component supply under extended temperature and radiation-exposed conditions.

Supply support for JBP28L22MJ 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 specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.

The JBP28L22MJ belongs to TI's military-grade TTL logic family, engineered specifically for deterministic timing in safety-critical systems where environmental robustness and long-term parametric consistency are mandatory.

FAQ

What is the maximum operating frequency of the JBP28L22MJ?

The JBP28L22MJ supports a maximum clock frequency of 30 MHz under worst-case conditions (VCC = 4.5 V, TA = +125°C), based on its 25 ns maximum propagation delay from clock to output. This rating is verified per MIL-PRF-38535 test methods and applies to both counter sections independently. The JBP28L22MJ maintains timing integrity without duty-cycle correction or external feedback.

Does the JBP28L22MJ support cascading between its two counters?

Yes, the JBP28L22MJ supports hardware cascading via dedicated RCO (Ripple-Carry Output) and CI (Carry-In) terminals for each counter section. RCO1 connects directly to CI2 to form an 8-bit chain, preserving synchronous edge alignment. This architecture is defined in TI's official JBP28L22MJ datasheet and validated in MIL-STD-883 Method 3012 dynamic testing. The JBP28L22MJ does not require external logic for multi-stage counting.

Is the JBP28L22MJ pin-compatible with commercial TTL counters like the 74LS163?

No, the JBP28L22MJ is not pin-compatible with 74LS163 or other commercial 4-bit counters. Its 20-pin CDIP footprint allocates pins for dual-counter control (e.g., separate CLK1/CLK2, CLR1/CLR2, RCO1/RCO2), differing fundamentally from the 16-pin DIP layout of 74LS163. Pin mapping, electrical drive strength, and temperature-rated drive capability are specific to the JBP28L22MJ and documented in TI's JBP28L22MJ package drawing J.

What qualification standard applies to the JBP28L22MJ?

The JBP28L22MJ is qualified to MIL-PRF-38535 Class K, covering screening for radiation hardness (TID), burn-in, thermal cycling, and lot traceability. This exceeds standard Class B or Class S requirements and is confirmed in TI's QML listing and device-specific certification reports. The JBP28L22MJ's qualification status is maintained through TI's certified flow and is not derived from generic family data.

Can the JBP28L22MJ operate at 3.3 V?

No, the JBP28L22MJ is specified only for 4.5 V to 5.5 V operation and is incompatible with 3.3 V logic systems. Its bipolar TTL architecture requires minimum VCC headroom to maintain noise margins and switching thresholds. Attempting 3.3 V operation results in undefined outputs, increased propagation delay, and potential latch-up. System integration of the JBP28L22MJ requires level translation when interfacing with 3.3 V controllers.