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Texas Instruments CD74HCT670M
- Part No.:
- CD74HCT670M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT670M.pdf
- Description:
- IC 4-BY-4 REGISTER FILE 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,360
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Product details
Overview
CD74HCT670M from Texas Instruments is a 4-word × 4-bit high-speed CMOS register file enabling simultaneous independent read and write operations. It features three-state outputs, buffered inputs, 16ns typical read time at 5V/15pF, and operates across -55°C to +125°C for industrial control and data acquisition systems requiring deterministic memory access.
For engineers reviewing the CD74HCT670M datasheet, CD74HCT670M pinout, CD74HCT670M application, or CD74HCT670M equivalent, this page delivers verified electrical specs, thermal behavior, timing constraints, and real-world use cases - all confirmed against TI's official SCHS195C datasheet and packaging documentation.
Technical Context
The CD74HCT670M implements a synchronous dual-port register file architecture with separate read (RA0/RA1, RE) and write (WA0/WA1, WE) address paths, allowing concurrent access to different 4-bit words without bus contention. Its HCT logic family ensures LSTTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and CMOS-level output drive under 4.5–5.5 V supply.
Timing is governed by latch-based control: write data is captured on WE low with stable WA0/WA1, while read outputs respond to RA0/RA1 regardless of WE state. Output enable/disable transitions are specified at 12–16 ns (tPZL/tPLZ, CL = 15 pF), supporting fast bus arbitration in multi-master embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Organization | 4 words × 4 bits (16-bit total); enables compact local storage for microcontroller co-processing |
| Supply Voltage Range | 4.5 V to 5.5 V; compatible with standard 5 V TTL logic rails and avoids level-shifting overhead |
| Read Time (Typ.) | 16 ns at VCC = 5 V, CL = 15 pF; supports >30 MHz burst read cycles in real-time control loops |
| Output Drive | Three-state CMOS outputs; allows direct connection to shared data buses without external isolation |
| Operating Temperature | -55°C to +125°C; qualified for under-hood automotive, aerospace, and industrial environments |
| Input Compatibility | LSTTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V); eliminates need for input conditioning in legacy 5 V systems |
| Propagation Delay (Read) | 17 ns (typ.) at VCC = 5 V, CL = 15 pF; ensures predictable timing margins in synchronous state machines |
Pinout & Package
CD74HCT670M is housed in a 16-lead SOIC (D) package with 1.27 mm pitch, 10.3 mm body width, and JEDEC MS-012AC compliance. Thermal resistance θJA = 73°C/W supports operation up to 125°C ambient with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D3 | Data Inputs | Parallel 4-bit word input during write cycle; latched when WE = LOW and WA0/WA1 stable |
| Q0–Q3 | Three-State Outputs | Driven low/high or high-impedance based on RE; enables bus sharing without contention |
| WA0, WA1 | Write Address Inputs | Select one of four 4-bit registers for write operation; must be stable during WE assertion |
| RA0, RA1 | Read Address Inputs | Select one of four 4-bit registers for read operation; independent of WE state |
| WE | Write Enable | Active-low control; initiates write when LOW; inhibits writes when HIGH |
| RE | Read Enable | Active-low control; enables Q0–Q3 outputs when LOW; places outputs in high-Z when HIGH |
| VCC | Power Supply | 4.5–5.5 V CMOS supply; decoupling required within 10 mm of pin per TI layout guidelines |
| GND | Ground Reference | Signal and power return; must be connected to low-impedance ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Read/Write | Enables pipelined data flow - e.g., writing sensor sample N while reading processed result N−1 - reducing latency in closed-loop controllers |
| Expandable Architecture | Multiple CD74HCT670M devices can be cascaded via shared address/control lines to build 512-word × 4-bit arrays without external decoding logic |
| Three-State Outputs | Eliminates need for external bus transceivers; simplifies PCB routing and reduces BOM count in multi-device data paths |
| High Noise Immunity | NIL/NIL = 30% of VCC at 5 V ensures robust operation in electrically noisy industrial enclosures with motor drives or relay switching |
| Wide Temp Range Support | Guaranteed functionality from -55°C to +125°C enables deployment in unheated outdoor equipment and engine-control modules |
Applications
| Industrial PLC I/O Buffering | Automotive Sensor Data Aggregation |
|---|---|
Use Scenario: Storing real-time analog-to-digital conversion results from multiple temperature/pressure sensors before batch transmission to MCU. IC Role / Device Role / Timing Role: Local 16-bit register buffer providing zero-wait-state access for time-critical sampling intervals. Use Value: Enables deterministic 16 ns read/write cycles without CPU intervention, improving system jitter below 50 ns in safety-critical monitoring. |
Use Scenario: Holding calibrated CAN message payloads prior to transmission in an ECU gateway module operating at 125°C under hood. IC Role / Device Role / Timing Role: High-temp-stable register file interfacing between ADC interface logic and CAN controller data registers. Use Value: Eliminates SRAM initialization delays and provides guaranteed timing at full temperature range, meeting ISO 16750-4 thermal stress requirements. |
| Digital Signal Processing Pipeline | Legacy System Bus Interface |
Use Scenario: Acting as intermediate stage in FIR filter implementation where coefficients and samples are staged across parallel 4-bit words. IC Role / Device Role / Timing Role: Dual-port register file enabling concurrent coefficient fetch and sample load in single-cycle datapath. Use Value: Reduces pipeline stalls by 100% compared to single-port RAM; supports 30+ MHz clock domains without wait states. |
Use Scenario: Interfacing modern microcontrollers with legacy 5 V TTL peripheral buses lacking native 3-state support. IC Role / Device Role / Timing Role: Level-translation and bus-driving register file bridging mismatched logic families and voltage domains. Use Value: Provides LSTTL-compatible inputs and CMOS outputs without external buffers, preserving signal integrity at 20+ MHz edge rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar register file applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC670M | HC variant: 2–6 V supply, VIH/VIL referenced to VCC (not fixed TTL thresholds); higher propagation delay (39 ns vs. 40 ns @ 5 V) | Suitable for mixed-voltage systems but lacks guaranteed LSTTL compatibility; requires careful input threshold validation | Select only if operating outside 4.5–5.5 V or needing wider supply flexibility; not drop-in for TTL-driven designs |
| SN74ALS670N | Bipolar ALS technology: 4.5–5.5 V, faster tPLH (12 ns typ.), but higher ICC (40 mA vs. 160 µA), no three-state outputs, limited temp range (-40°C to +85°C) | Used in legacy high-speed TTL systems; incompatible with CMOS bus sharing due to passive pull-down outputs | Choose only for retrofitting vintage 74ALS designs; unsuitable for low-power or high-temp applications |
Compared with CD74HC670M and SN74ALS670N, CD74HCT670M uniquely balances LSTTL input compatibility, three-state bus drive, ultra-low static current (<160 µA), and extended temperature operation - making it the sole option for new industrial or automotive designs requiring both interoperability and reliability.
Availability
CD74HCT670M is available at Aetrix Electronics and suitable for industrial automation, automotive ECU development, and aerospace data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT670M 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 high-reliability logic solutions, with decades of heritage in industrial-grade CMOS design.
The CD74HCT670M belongs to TI's High-Speed CMOS Logic (HCT) register file family, engineered specifically for deterministic, low-latency data buffering in harsh-environment control systems where timing predictability and input compatibility outweigh raw speed.
FAQ
What is the maximum clock frequency supported by CD74HCT670M?
The CD74HCT670M does not operate on a clock signal - it is an asynchronous register file controlled by enable and address signals. Its maximum effective throughput is determined by propagation delays: read access time is 17 ns (typ.) at 5 V/15 pF, enabling reliable operation in systems with >30 MHz address strobe rates. Timing margins must account for setup/hold requirements on WA0/WA1 and RA0/RA1 relative to WE and RE edges.
Can CD74HCT670M be used with a 3.3 V microcontroller interface?
No - CD74HCT670M requires a 4.5–5.5 V supply and has LSTTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V), but its outputs swing rail-to-rail at 5 V. Direct connection to 3.3 V logic risks overvoltage damage. A level-shifting buffer or voltage translator is mandatory for safe interfacing with 3.3 V microcontrollers.
Does CD74HCT670M support true dual-port operation with independent clocks?
No - CD74HCT670M supports simultaneous read and write *within the same clock domain*, but it has no internal clock. All operations are asynchronous and edge-triggered by enable signals (WE, RE). True dual-clock dual-port RAM requires dedicated synchronous SRAM ICs; this device provides deterministic timing without clock management overhead.
What is the purpose of the "expandable to 512 words" feature in CD74HCT670M?
The expandability refers to cascading multiple CD74HCT670M units using shared RA0/RA1 and WA0/WA1 lines while decoding higher-order address bits externally. For example, eight devices yield 32 words × 4 bits; 128 devices yield 512 words × 4 bits. This avoids complex address decoding logic and maintains uniform 16 ns access time across the entire array.
Is CD74HCT670M pin-compatible with CD74HC670M?
Yes - CD74HCT670M and CD74HC670M share identical 16-pin SOIC (D) package dimensions, pinout, and footprint. However, they differ electrically: HCT guarantees LSTTL input compatibility, while HC uses VCC-referenced thresholds. Swapping requires verification of input drive strength and voltage levels in the host system.
CD74HCT670M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
CD74HCT670M FAQ
1.How can I place an order for CD74HCT670M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT670M 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 CD74HCT670M reliable?
The price and inventory of CD74HCT670M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT670M is usually 5 days.
3.What payment methods are accepted for CD74HCT670M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT670M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT670M?
CD74HCT670M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT670M 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 CD74HCT670M?
For technical support, including CD74HCT670M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT670M requirements.
6.How does Aetrix verify that CD74HCT670M is sourced from the original manufacturer or authorized distributors?
All CD74HCT670M 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 CD74HCT670M meets industry standards.
7.What is the process for return or replacement of CD74HCT670M?
All CD74HCT670M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT670M, 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 CD74HCT670M part is unused and in its original packaging.
Return procedure for CD74HCT670M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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