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Texas Instruments CD74HC40105E
- Part No.:
- CD74HC40105E
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HC40105E.pdf
- Description:
- IC FIFO ASYNC 16X4 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:460
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Product details
Overview
CD74HC40105E from Texas Instruments is a high-speed CMOS 4-bit × 16-word first-in-first-out (FIFO) elastic storage register with independent asynchronous input/output control, three-state outputs, master reset, and status flags (DIR/DOR). It operates from 2V to 6V, supports -55°C to +125°C, and enables bit-rate smoothing between mismatched clock domains in data buffering applications.
For engineers reviewing the CD74HC40105E datasheet, CD74HC40105E pinout, CD74HC40105E application, or CD74HC40105E equivalent, key selection criteria include its 16-word depth, independent shift-in/shift-out timing, DIR/DOR flag behavior, three-state output enable control, and PDIP-16 package compatibility with legacy through-hole designs.
Technical Context
The CD74HC40105E implements a marker-bit–based control logic architecture where each of 16 positions holds a 4-bit word and a status flip-flop ("1" = filled, "0" = vacant). Data ripples automatically from input to output end as valid words propagate forward upon detection of adjacent fill/vacancy transitions.
Its shift-out (SO) signal operates independently of the three-state output enable (OE), eliminating the CD40105B's restriction on OE transitions during SO activity. The DIR flag goes low only when FIFO is full; DOR goes high only when at least one word is available at output - enabling precise handshaking without external counters or clocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 4-bit × 16-word asynchronous FIFO buffer with elastic storage and status flags |
| Supply Voltage | 2V to 6V - supports mixed-voltage system interfacing and battery-powered operation |
| Operating Temperature | -55°C to +125°C - qualified for military, aerospace, and harsh industrial environments |
| Max SI/SO Frequency | 12 MHz at VCC = 4.5V - determines maximum sustained data throughput rate |
| Propagation Delay (SI→Qn) | 300 ns (typ) at VCC = 4.5V, CL = 50pF - defines worst-case latency from input load to output availability |
| Three-State Enable/Disable | tPZH/tPHZ ≤ 45 ns at VCC = 4.5V - ensures fast bus release and acquisition for time-critical multiplexing |
| Input Leakage Current | ±1 µA max over full temperature range - guarantees minimal loading on upstream drivers |
Pinout & Package
CD74HC40105E is housed in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and standard through-hole mounting footprint compatible with MIL-STD-883 and JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-HIGH three-state control for Q0–Q3; independent of SO timing |
| 2 (SI) | Shift-In Clock | Low-to-high edge loads one 4-bit word into position 1 if DIR = HIGH |
| 3 (D0) | Data Input 0 | LSB of 4-bit parallel input word; sampled on SI rising edge |
| 4 (D1) | Data Input 1 | Second bit of parallel input word |
| 5 (D2) | Data Input 2 | Third bit of parallel input word |
| 6 (GND) | Ground | Reference for all digital and power connections |
| 7 (D3) | Data Input 3 | MSB of 4-bit parallel input word |
| 8 (VCC) | Power Supply | +2V to +6V supply; decoupling required per high-speed CMOS practice |
| 9 (DOR) | Data-Out Ready Flag | Active-HIGH indicates ≥1 valid word present at output; goes LOW after SO pulse |
| 10 (Q0) | Data Output 0 | LSB of current output word; three-state controlled by OE |
| 11 (Q1) | Data Output 1 | Second bit of current output word |
| 12 (Q2) | Data Output 2 | Third bit of current output word |
| 13 (Q3) | Data Output 3 | MSB of current output word |
| 14 (MR) | Master Reset | Active-HIGH clears all control markers to "0"; DOR → LOW, DIR → HIGH |
| 15 (SO) | Shift-Out Clock | Falling edge advances next word to output and updates DOR flag |
| 16 (DIR) | Data-In Ready Flag | Active-HIGH indicates space available at input; goes LOW when FIFO is full |
Key Features
| Feature | Design Value |
|---|---|
| Independent Asynchronous I/O | Enables seamless bridging between systems with unrelated clocks (e.g., UART ↔ microcontroller) without clock domain crossing logic |
| Expandable Architecture | Multiple CD74HC40105E units can be cascaded via DIR↔SO and DOR↔SI to increase depth or width without redesign |
| Status Flag Outputs (DIR/DOR) | Eliminates need for external full/empty counters; provides real-time handshaking with zero software overhead |
| Shift-Out Independent of OE | Permits continuous data streaming while maintaining bus isolation - critical for hot-swap and multi-master bus systems |
| Wide Temperature Range | Validated operation from -55°C to +125°C supports deployment in avionics, downhole tools, and engine control units |
Applications
| Bit-Rate Smoothing | CPU/Terminal Buffering |
|---|---|
Use Scenario: Synchronizing data streams between a 1 Mbps UART and a 25 MHz CPU bus with mismatched burst rates. IC Role / Device Role / Timing Role: Elastic FIFO absorbs jitter and prevents overrun/underrun by decoupling input and output timing domains. Use Value: Eliminates packet loss and eliminates need for complex flow-control firmware or external memory arbitration. | Use Scenario: Isolating a terminal interface IC from a main processor during interrupt-driven I/O bursts. IC Role / Device Role / Timing Role: Acts as a temporary holding register that absorbs variable-length command sequences before CPU servicing. Use Value: Prevents CPU starvation during high-throughput serial command injection; reduces interrupt latency variance. |
| Data Communications | Radar Data Acquisition |
Use Scenario: Interfacing a legacy RS-232 modem with a modern FPGA-based protocol stack operating at different clock frequencies. IC Role / Device Role / Timing Role: First-in-first-out buffer with DIR/DOR handshaking manages variable inter-character spacing and framing delays. Use Value: Enables deterministic data capture without oversampling or clock recovery circuitry. | Use Scenario: Capturing pulsed radar return signals at 100 MSPS and feeding them to a slower ADC controller running at 10 MSPS. IC Role / Device Role / Timing Role: Elastic storage stage that absorbs transient data bursts and delivers steady stream to downstream processing. Use Value: Prevents signal clipping during peak returns; maintains timing integrity across sampling rate conversion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HCT40105E | LSTTL-compatible inputs (VIH = 2V min, VIL = 0.8V max); 4.5V–5.5V only supply range | Better suited for mixed TTL/CMOS systems; not usable below 4.5V or above 5.5V | Select when interfacing directly with 5V TTL logic families and strict 5V rail operation is guaranteed |
| SN74ACT259N | 8-bit addressable latch (not FIFO); no DIR/DOR flags or ripple-through capability | Used for static register storage, not asynchronous rate-matching; requires external control logic for FIFO-like behavior | Choose only if application requires random-access addressing rather than sequential first-in-first-out operation |
Compared with CD74HCT40105E, the CD74HC40105E offers wider voltage flexibility (2–6V) and higher noise immunity, while SN74ACT259N lacks native FIFO functionality and requires additional sequencing logic to emulate elastic buffering - making CD74HC40105E the optimal choice for true asynchronous rate adaptation.
Availability
CD74HC40105E is available at Aetrix Electronics and suitable for CPU buffering, radar data acquisition, bit-rate smoothing, and peripheral interfacing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC40105E 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The CD74HC40105E belongs to TI's High-Speed CMOS Logic family, designed specifically for asynchronous data buffering, clock domain isolation, and elastic storage in mission-critical embedded systems.
FAQ
What is the primary function of the CD74HC40105E?
The CD74HC40105E is a 4-bit × 16-word first-in-first-out (FIFO) elastic storage register. It buffers asynchronous data streams by allowing independent input and output clocking, using DIR and DOR status flags to manage handshaking without external control logic. Its core purpose is bit-rate smoothing between mismatched timing domains.
Does the CD74HC40105E support operation at 3.3V?
Yes, the CD74HC40105E supports 2V to 6V supply operation, including 3.3V nominal rails. At VCC = 3.3V, it meets all specified DC and AC performance parameters per the datasheet, with VIH ≈ 2.31V (70% of VCC) and VIL ≈ 0.99V (30% of VCC), ensuring robust noise margins in mixed-voltage systems.
How does the master reset (MR) affect stored data in the CD74HC40105E?
The MR input resets only the control logic marker bits to "0", declaring all 16 positions vacant. It does not clear the actual data latches - existing data remains intact but is marked invalid and will be overwritten on the next SI pulse. DOR goes LOW and DIR goes HIGH immediately upon MR assertion, signaling an empty state.
Can multiple CD74HC40105E devices be cascaded to increase FIFO depth?
Yes, CD74HC40105E devices can be cascaded to form deeper FIFOs by connecting DIR of one device to SO of the next, and DOR of one to SI of the prior. This configuration preserves handshaking integrity across stages. A master reset must be applied after power-up to initialize the chain's control logic consistently.
Is the CD74HC40105E pin-compatible with the older CD40105B?
No, the CD74HC40105E is not pin-compatible with the CD40105B. While functionally similar as a 4×16 FIFO, the CD74HC40105E reassigns pin 1 to OE (output enable) instead of the CD40105B's unused pin, and introduces independent SO/OE timing - requiring PCB layout revision for direct replacement.
CD74HC40105E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Size:
- 64 (16 x 4)
- Function:
- Asynchronous
- Data Rate:
- -
- Access Time:
- -
- Voltage - Supply:
- 2 V ~ 6 V
- Current - Supply (Max):
- -
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- No
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74HC40105E FAQ
1.How can I place an order for CD74HC40105E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC40105E 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 CD74HC40105E reliable?
The price and inventory of CD74HC40105E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC40105E is usually 5 days.
3.What payment methods are accepted for CD74HC40105E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC40105E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC40105E?
CD74HC40105E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC40105E 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 CD74HC40105E?
For technical support, including CD74HC40105E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC40105E requirements.
6.How does Aetrix verify that CD74HC40105E is sourced from the original manufacturer or authorized distributors?
All CD74HC40105E 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 CD74HC40105E meets industry standards.
7.What is the process for return or replacement of CD74HC40105E?
All CD74HC40105E units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC40105E, 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 CD74HC40105E part is unused and in its original packaging.
Return procedure for CD74HC40105E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD74HC40105E Tags
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