Texas Instruments 7704201EA

Overview

7704201EA from Texas Instruments is a military-grade 4×4 register file IC with three-state outputs, implemented in bipolar TTL logic. It provides 16-bit storage (four 4-bit words), supports simultaneous read/write via separate address inputs, operates over –55°C to +125°C, and features output enable control for bus interfacing - used in legacy aerospace data path and arithmetic logic unit support circuits.

For engineers reviewing the 7704201EA datasheet, 7704201EA pinout, 7704201EA application, or 7704201EA equivalent, key selection criteria include its CDIP-16 hermetic package, full military temperature range, three-state output drive capability, and compatibility with LS-TTL system timing budgets.

Technical Context

The 7704201EA implements a synchronous 4-word × 4-bit register file using discrete TTL gates and latches, with independent 2-bit word address decoding for read and write operations. It uses dual address buses (A0–A1 for write, B0–B1 for read) and separate write enable (WE) and output enable (OE) controls to manage data flow without bus contention.

Its three-state outputs are designed for direct connection to shared data buses, with propagation delays (t_PLH/t_PHL) specified at 35 ns max under military conditions. The device requires dual power supply rails (V_CC = +5 V, GND), draws up to 80 mA ICC(max), and exhibits input thresholds compatible with standard LS-TTL logic families.

Key Specifications

Pinout & Package

7704201EA is housed in a 16-pin Ceramic Dual In-line Package (CDIP-J) with 0.3-inch body width and through-hole mounting. The package meets MIL-STD-883 requirements for mechanical robustness and hermeticity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar register file applications.

Compared with SN54LS670J and SNJ54LS670J, the 7704201EA offers identical core functionality and military-grade reliability but carries a distinct orderable ID used in specific TI distribution and government contract line items - selection depends on procurement pathway and certification requirements, not performance.

Availability

7704201EA is available at Aetrix Electronics and suitable for flight control computers, secure crypto modules, radar signal processors, and missile guidance systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 7704201EA 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 high-reliability logic solutions for industrial, automotive, and defense markets.

The SN54/74LS670 product line was developed in the 1970s to provide compact, synchronous register storage for TTL-based computing and control systems - optimized for deterministic timing, bus-sharing capability, and ruggedized packaging.

FAQ

What is the operating temperature range of the 7704201EA?

The 7704201EA is rated for operation from –55°C to +125°C, meeting military specification requirements for extreme-environment applications. This range is validated per MIL-STD-883 test methods including thermal cycling and high-temperature life testing. The 7704201EA maintains full functionality and timing compliance across this entire span without derating. Its CDIP-J package contributes to thermal stability in high-vibration or high-humidity settings where plastic packages may fail.

Does the 7704201EA support simultaneous read and write operations?

Yes, the 7704201EA supports concurrent read and write via independent address buses: A0/A1 for write selection and B0/B1 for read selection. This allows accessing different 4-bit registers in the same cycle - for example, writing to register 2 while reading from register 0. The 7704201EA achieves this without internal arbitration logic, relying instead on separate enable controls (WE and OE) and fully decoded address paths, making it suitable for pipelined architectures.

What package type is used for the 7704201EA?

7704201EA uses a 16-pin Ceramic Dual In-line Package (CDIP-J) with hermetic sealing and through-hole leads. This package complies with MIL-STD-1835 and is designed for high-reliability applications requiring resistance to moisture, thermal shock, and mechanical stress. Unlike plastic DIP variants, the CDIP-J construction ensures long-term parameter stability in aerospace and defense systems where field lifetime exceeds 20 years.

Is the 7704201EA pin-compatible with commercial SN74LS670 variants?

No - the 7704201EA is not pin-compatible with commercial SN74LS670 variants such as SN74LS670N (PDIP) or SN74LS670D (SOIC), due to differing pinouts and electrical drive characteristics. While functionally identical, the 7704201EA's CDIP-J pin assignment follows military layout conventions and lacks the internal pull-down resistors found in some commercial versions. Always verify pin mapping and loading specifications before substitution.

What logic family does the 7704201EA belong to?

The 7704201EA belongs to the Texas Instruments LS-TTL (Low-Power Schottky Transistor-Transistor Logic) family. It features Schottky-clamped bipolar transistors for improved speed-power trade-offs versus standard TTL, with typical propagation delay of 35 ns and supply current under 80 mA. The 7704201EA interfaces directly with other LS-TTL devices like SN74LS00 or SN74LS175 without level-shifting or buffering.