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Texas Instruments CD74HCT670M96E4
- Part No.:
- CD74HCT670M96E4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT670M96E4.pdf
- Description:
- IC 4X4 REGISTER FILE 3ST 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,173
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Product details
Overview
CD74HCT670M96E4 from Texas Instruments is a 4-word × 4-bit high-speed CMOS register file with simultaneous independent 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 VCC = 5 V, CL = 15 pF. It is used in real-time data buffering and addressable storage within microcontroller peripheral interfaces.
For engineers reviewing the CD74HCT670M96E4 datasheet, CD74HCT670M96E4 pinout, CD74HCT670M96E4 application, or CD74HCT670M96E4 equivalent, key selection criteria include its dual-address bus architecture (WA0/WA1 and RA0/RA1), true three-state output control (RE/WE), HCT-level input compatibility, SOIC-16 packaging, and guaranteed operation across extended temperature extremes without derating.
Technical Context
The CD74HCT670M96E4 implements a synchronous 4×4 register file with physically separate write and read address decoders, enabling concurrent write-to-one-location and read-from-another without pipeline stalls. Its dual enable logic (WE active-low for write, RE active-low for read) isolates input and output paths, while buffered address/data inputs ensure noise-immune signal acquisition.
Internally, it uses static CMOS latches per bit with edge-insensitive address sampling-RA0/RA1 selection is unconstrained by WE or RE state-and features dedicated three-state output drivers per Q0–Q3 with 25 mA sink/source capability. The HCT variant guarantees TTL-level input thresholds and 5 V supply compatibility only, excluding 2–6 V HC-range operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Organization | 4 words × 4 bits (16-bit total); enables compact addressable storage without external decoding logic |
| Supply Voltage Range | 4.5 V to 5.5 V only; ensures direct interface with 5 V TTL and microcontroller I/O without level shifters |
| Input Compatibility | LSTTL-compatible: VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V; eliminates need for input conditioning in mixed-logic systems |
| Read Access Time | 17 ns typical (CL = 15 pF, TA = 25°C); supports >25 MHz burst read cycles in timing-critical control loops |
| Operating Temperature | -55°C to +125°C; qualified for aerospace, defense, and under-hood automotive applications without derating |
| Output Drive | Three-state CMOS outputs with ±25 mA drive; allows bus-sharing and expansion to 512-word capacity via parallel stacking |
| Propagation Delay | 40 ns max (reading any word, CL = 50 pF, TA = -55°C to +125°C); guarantees deterministic timing across full military temp range |
Pinout & Package
CD74HCT670M96E4 is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012 compliant, and RoHS-compliant NIPDAU lead finish. It is rated MSL Level-1 (unlimited floor life) and compatible with standard reflow profiles up to 260°C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D3 | Data Input Lines | Accept 4-bit parallel word during write cycle when WE is low; latched on WA0/WA1 address |
| Q0–Q3 | Three-State Output Lines | Drive addressed 4-bit word when RE is low; high-impedance when RE is high for bus sharing |
| WA0, WA1 | Write Address Inputs | Select one of four internal registers for data write; must be stable during WE low pulse |
| RA0, RA1 | Read Address Inputs | Select one of four internal registers for data read; independent of WE state |
| WE | Write Enable (Active-Low) | Controls write latch enable; low = data written, high = address/data inputs ignored |
| RE | Read Enable (Active-Low) | Controls output driver enable; low = Q0–Q3 driven, high = outputs tri-stated |
| VCC | Positive Supply | 4.5 V to 5.5 V power rail; powers all logic and output drivers |
| GND | Ground Reference | Return path for all inputs, outputs, and internal circuitry; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Read/Write | Independent RAx and WAx buses allow non-blocking memory access-critical for real-time FIFO emulation |
| Expandable Architecture | Outputs support wired-OR bus connection; enables scalable 512-word × 4-bit arrays using multiple devices |
| True Three-State Outputs | Q0–Q3 enter high-impedance state when RE = high, eliminating contention on shared data buses |
| Extended Temperature Operation | Guaranteed functionality from -55°C to +125°C without performance degradation or derating |
| HCT Input Thresholds | VIH ≥ 2.0 V / VIL ≤ 0.8 V at VCC = 5 V ensures reliable interfacing with legacy TTL and 5 V MCU GPIO |
Applications
| Industrial PLC Data Buffering | Aerospace Avionics Register Bank |
|---|---|
Use Scenario: Storing sensor calibration coefficients and real-time I/O status in programmable logic controllers with deterministic scan cycles. IC Role / Device Role / Timing Role: Acts as a fast-access, dual-port register bank enabling concurrent update of configuration data and retrieval of process variables. Use Value: 17 ns read time and simultaneous read/write eliminate pipeline stalls, improving PLC scan throughput by up to 30% versus sequential SRAM access. | Use Scenario: Holding flight control command registers and telemetry snapshot buffers in radiation-tolerant avionics modules. IC Role / Device Role / Timing Role: Provides radiation-hardened-adjacent, temperature-stable storage for critical flight parameters with no refresh overhead. Use Value: -55°C to +125°C qualification and 40 ns worst-case propagation delay ensure deterministic timing in thermal-varying airframe environments. |
| Military Communications Baseband Buffer | Test Equipment Pattern Memory |
Use Scenario: Temporarily storing modulated symbol data between baseband processing stages in secure HF/VHF radios. IC Role / Device Role / Timing Role: Functions as a low-latency, addressable scratchpad memory synchronized to FPGA-controlled address buses. Use Value: Three-state outputs allow seamless integration into multi-device test bus architectures without additional bus transceivers. | Use Scenario: Holding stimulus/response patterns in automated test equipment (ATE) for IC functional validation. IC Role / Device Role / Timing Role: Serves as a compact, deterministic pattern store with precise read/write timing control for sub-20 ns test vectors. Use Value: 17 ns typical read access and 5 ns hold time guarantee setup/hold compliance for high-speed digital pattern generators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar register file applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC670M96 | HC variant: 2 V–6 V supply, VIH/VIL thresholds tied to VCC (not fixed TTL levels); higher input leakage at temperature extremes | Suitable for mixed-voltage systems but incompatible with strict 5 V TTL input logic without level translation | Select only if system uses variable VCC or requires wider voltage margin; not drop-in for CD74HCT670M96E4 |
| SN74ACT670N | ACT family: 4.5 V–5.5 V supply, faster 10 ns typical read time, higher drive (±24 mA), but limited to 0°C–70°C commercial temp range | Optimized for high-speed lab/test equipment where extended temperature is not required | Choose when speed > temperature range; verify PCB layout supports ACT's higher edge rates and noise sensitivity |
Compared with CD74HC670M96 and SN74ACT670N, CD74HCT670M96E4 uniquely balances military-grade temperature resilience, TTL-compatible inputs, and predictable 17 ns access latency-making it the sole option for ruggedized embedded systems requiring both interoperability and environmental robustness.
Availability
CD74HCT670M96E4 is available at Aetrix Electronics and suitable for industrial PLC data buffering, aerospace avionics register banks, and military communications baseband buffering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT670M96E4 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 over 90 years of innovation in high-reliability components.
The CD74HCT670M96E4 belongs to TI's High-Speed CMOS Logic register file product line, designed specifically for deterministic, low-latency, dual-port data storage in mission-critical embedded control and signal processing systems.
FAQ
What is the maximum operating frequency supported by the CD74HCT670M96E4?
The CD74HCT670M96E4 does not specify a maximum clock frequency, as it is an asynchronous register file. Its timing is governed by setup/hold times and propagation delays: minimum WE pulse width is 20 ns, and read access time is 17 ns typical (CL = 15 pF). System-level maximum throughput depends on address/data valid windows and bus protocol-not a fixed fMAX value. For CD74HCT670M96E4, design margins should use worst-case 40 ns propagation delay across -55°C to +125°C.
Can the CD74HCT670M96E4 be used with a 3.3 V microcontroller interface?
No, the CD74HCT670M96E4 requires a 4.5 V to 5.5 V supply and is not 3.3 V tolerant. Its inputs are LSTTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V), but applying 3.3 V logic signals directly risks violating VIH min at VCC = 5 V (needs ≥2.0 V, acceptable) yet may cause excessive input current or undefined behavior due to internal clamping. For CD74HCT670M96E4 interfacing with 3.3 V systems, level-shifting circuitry or a 5 V I/O domain is mandatory.
Does the CD74HCT670M96E4 support true dual-port operation with independent clocks?
No, the CD74HCT670M96E4 supports simultaneous read and write operations but uses a single asynchronous interface-there are no internal clocks or clock inputs. Address and control signals (WA0/WA1, RA0/RA1, WE, RE) are level-sensitive and must meet setup/hold timing relative to each other. True dual-clock dual-port RAM functionality is not provided; CD74HCT670M96E4 is a combinatorial register file, not a synchronous memory.
What is the meaning of the "E4" suffix in CD74HCT670M96E4?
The "E4" suffix in CD74HCT670M96E4 is a Texas Instruments internal packaging and reel variant code indicating a 2500-unit tape-and-reel orderable part in SOIC-16 package with NIPDAU lead finish, MSL Level-1 rating, and standard TI marking ("HCT670M"). It is functionally identical to CD74HCT670M96 and differs only in packaging logistics-not electrical or thermal specification. CD74HCT670M96E4 is fully interchangeable with CD74HCT670M96 in design and application.
How does the CD74HCT670M96E4 handle bus contention when multiple devices share Q0–Q3 outputs?
The CD74HCT670M96E4 prevents bus contention through its active-low RE (Read Enable) input: when RE is high, all Q0–Q3 outputs enter high-impedance (Z) state, electrically disconnecting them from the bus. Only the device with RE = low drives the bus, allowing safe wired-OR expansion. This behavior is confirmed in the Read Mode Select Table, where RE = H forces Z-state regardless of RA0/RA1 or WE state-ensuring clean, contention-free multi-device bus operation for CD74HCT670M96E4 implementations.
CD74HCT670M96E4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Register File
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HCT670M96E4 FAQ
1.How can I place an order for CD74HCT670M96E4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT670M96E4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD74HCT670M96E4 reliable?
The price and inventory of CD74HCT670M96E4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT670M96E4 is usually 5 days.
3.What payment methods are accepted for CD74HCT670M96E4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT670M96E4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT670M96E4?
CD74HCT670M96E4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT670M96E4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD74HCT670M96E4?
For technical support, including CD74HCT670M96E4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT670M96E4 requirements.
6.How does Aetrix verify that CD74HCT670M96E4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT670M96E4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD74HCT670M96E4 meets industry standards.
7.What is the process for return or replacement of CD74HCT670M96E4?
All CD74HCT670M96E4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT670M96E4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD74HCT670M96E4 part is unused and in its original packaging.
Return procedure for CD74HCT670M96E4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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