Texas Instruments CD74HC670M96

Overview

CD74HC670M96 from Texas Instruments is a high-speed CMOS 4×4 register file IC enabling simultaneous independent read and write operations on a 16-bit (4-word × 4-bit) memory array. It features three-state outputs, buffered inputs, 16ns typical read time at 5V/15pF, and operates across -55°C to +125°C - used in real-time data buffering, addressable latch interfaces, and digital control logic where dual-port access is required.

For engineers reviewing the CD74HC670M96 datasheet, CD74HC670M96 pinout, CD74HC670M96 application, or CD74HC670M96 equivalent, key selection considerations include simultaneous read/write capability, SOIC-16 package compatibility, HC-series voltage range (2–6V), wide temperature operation, and three-state bus interface support for memory expansion.

Technical Context

The CD74HC670M96 implements a synchronous dual-port register file with separate read and write address decoders (RA0/RA1 and WA0/WA1), independent enable controls (RE and WE), and transparent data latching during write cycles. Its architecture supports concurrent access without internal arbitration logic.

It uses standard HC CMOS logic with rail-to-rail output swing, 10 LSTTL fanout capability, and balanced propagation delay (e.g., 39ns typical propagation delay for read operations at 4.5V/50pF). Input thresholds are referenced to VCC (VIH = 3.15V min, VIL = 1.35V max at 4.5V), ensuring noise immunity of ≥30% of VCC.

Key Specifications

Pinout & Package

CD74HC670M96 is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package, 3.9mm body width, with standard JEDEC MS-012AC footprint and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HCT670M96, CD74HC670M96 supports wider supply range and CMOS input thresholds, making it more versatile in mixed-voltage designs; versus SN74LVCR162245DGGR, CD74HC670M96 provides essential on-chip 4×4 register storage that transceivers cannot replicate.

Availability

CD74HC670M96 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC670M96 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 logic solutions with decades of high-reliability product development.

The CD74HC670M96 belongs to TI's High-Speed CMOS Logic family, designed specifically for deterministic, low-latency digital control subsystems requiring dual-port register access without external memory or complex timing controllers.

FAQ

What is the maximum clock frequency supported by CD74HC670M96?

The CD74HC670M96 does not operate on a clock signal - it is an asynchronous register file controlled by edge-triggered enable signals (WE and RE). Its effective throughput is governed by propagation delays: typical read access is 39ns at 4.5V/50pF, supporting up to ~25 MHz sustained read/write toggle rates in properly timed systems. The CD74HC670M96 relies on setup/hold timing rather than a system clock.

Can CD74HC670M96 be used with a 3.3V microcontroller?

Yes, CD74HC670M96 supports 2V–6V operation and has CMOS-compatible input thresholds (VIH = 1.8V min at 3.3V supply), making it fully interoperable with 3.3V microcontrollers. Its outputs swing rail-to-rail, delivering >3.1V VOH and <0.2V VOL at 3.3V, ensuring robust logic-level compatibility without level shifters. The CD74HC670M96 maintains full functionality across this range.

How many CD74HC670M96 devices can be connected in parallel to expand word width?

CD74HC670M96 outputs are three-state, allowing unlimited parallel expansion of word width - for example, eight CD74HC670M96 devices can implement a 4×32-bit register file. All share common RA0/RA1, RE, WA0/WA1, and WE lines; D0–D3 and Q0–Q3 are wired separately per bit position. The CD74HC670M96 datasheet confirms expandability to 512 words × 4 bits using this method.

Is CD74HC670M96 pin-compatible with CD74HCT670M96?

Yes, CD74HC670M96 and CD74HCT670M96 share identical SOIC-16 pinout, package dimensions, and terminal functions. They differ only in input threshold specifications and supply voltage range: CD74HC670M96 accepts 2–6V and uses CMOS thresholds, while CD74HCT670M96 requires 4.5–5.5V and matches TTL input levels. The CD74HC670M96 may be substituted in HCT designs if VCC is 5V and noise margins permit.

Does CD74HC670M96 require external pull-up resistors on its outputs?

No, CD74HC670M96 does not require external pull-ups on Q0–Q3 outputs because it features active CMOS push-pull drivers in the low-impedance state and high-impedance (Hi-Z) off-state - not open-drain. Pull-ups would interfere with valid logic levels and increase power consumption. The CD74HC670M96 outputs drive cleanly to VCC or GND when enabled and float electrically when RE is high.