Texas Instruments CD74HCT670M96

Overview

CD74HCT670M96 from Texas Instruments is a 4-word × 4-bit high-speed CMOS register file with independent simultaneous read/write capability, three-state outputs, and LSTTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V). It operates from 4.5 V to 5.5 V, supports -55°C to +125°C industrial/military temperature range, and delivers 17 ns typical read access time at 5 V/15 pF for embedded control buffering and data routing applications.

For engineers reviewing the CD74HCT670M96 datasheet, CD74HCT670M96 pinout, CD74HCT670M96 application, or CD74HCT670M96 equivalent, this page provides verified functional identity, validated SOIC-16 pin mapping, confirmed HCT-family timing and logic compatibility, and two field-validated alternative parts for register-file-based address/data multiplexing in real-time control systems.

Technical Context

The CD74HCT670M96 implements a synchronous dual-port register file architecture with separate write address (WA0/WA1), read address (RA0/RA1), write enable (WE), and read enable (RE) controls. Its internal latches retain data during WE high, and output drivers enter high-impedance state when RE is high - enabling bus sharing without external isolation.

It uses true CMOS input stages with ±1 µA leakage and TTL-level input thresholds, ensuring direct interface with legacy 5 V LSTTL logic while maintaining low quiescent current (≤160 µA over full temperature range). Propagation delays are characterized at CL = 15 pF and CL = 50 pF, with tPHL/tPLH ≤ 53 ns (max, -55°C to +125°C) for read operations under 4.5–5.5 V supply.

Key Specifications

Pinout & Package

CD74HCT670M96 is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012AC compliant outline, and moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4×4 register file applications.

Compared with CD74HC670M96 and SN74ALS670N, the CD74HCT670M96 uniquely balances LSTTL input compatibility, three-state bus drive, and military-grade temperature resilience - making it the sole option for new designs requiring both legacy interface support and extended environmental operation.

Availability

CD74HCT670M96 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, avionics sensor buffering, and military radio baseband processing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HCT670M96 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 connectivity technologies, with decades of heritage in high-reliability logic and interface solutions.

The CD74HCT670M96 belongs to TI's legacy High-Speed CMOS Logic (HCT) register file product line, designed specifically for deterministic, low-latency data staging in real-time control, instrumentation, and defense electronics where simultaneous read/write and bus-sharing capability are essential.

FAQ

What is the maximum clock frequency supported by CD74HCT670M96?

The CD74HCT670M96 does not use a clock signal; it is an asynchronous register file controlled by edge-triggered enable signals (WE and RE). Its effective throughput is governed by access timing: minimum WE pulse width is 30 ns, and read access time is ≤53 ns (max) over -55°C to +125°C. This supports sustained data rates exceeding 10 MHz in pipelined configurations using independent read/write addressing.

Can CD74HCT670M96 be used with 3.3 V logic interfaces?

No - the CD74HCT670M96 is strictly a 4.5 V to 5.5 V device with LSTTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). Driving its inputs from 3.3 V logic may result in undefined operation due to insufficient VIH margin. For 3.3 V systems, consider the CD74HC670M96 variant, which supports 2 V–6 V operation and CMOS input levels.

How many CD74HCT670M96 devices can be connected on a shared data bus?

Up to 128 CD74HCT670M96 devices can be cascaded on a single 4-bit data bus using their three-state outputs, as specified in the "Expandable to 512 Words of n-Bits" feature. Each device's Q0–Q3 outputs must be wired in parallel, with individual RE control lines managed by higher-level address decoding logic to prevent bus contention.

Does CD74HCT670M96 retain data when WE is high?

Yes - when WE is high, the CD74HCT670M96 holds previously written data in all four registers indefinitely, provided VCC remains within specification. Inputs (D0–D3, WA0/WA1) are inhibited during this state, and no new data is latched regardless of address changes. Data persistence relies solely on continuous power; no nonvolatile storage is present.

What is the meaning of the "96" suffix in CD74HCT670M96?

The "96" suffix in CD74HCT670M96 indicates tape-and-reel packaging: 2500 units per large reel, conforming to EIA-481-D standards. The SOIC-16 body is oriented in quadrant Q1 per JEDEC J-STD-020, with sprocket holes positioned for standard pick-and-place feeders. This differs from the "M" (tube) and "MT" (small-reel, 250 units) variants.