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Renesas CD40105BDMSR
- Part No.:
- CD40105BDMSR
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD40105BDMSR.pdf
- Description:
- RENESAS
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
CD40105BDMSR from Intersil is a CMOS FIFO register providing 4-bit × 16-word elastic buffering for asynchronous data rate matching, featuring independent shift-in/shift-out clocks, 3-state outputs, DATA-IN READY (DIR) and DATA-OUT READY (DOR) status flags, and master reset - used in CPU/terminal buffering and radar data acquisition systems.
For engineers reviewing the CD40105BDMSR datasheet, CD40105BDMSR pinout, CD40105BDMSR application, or CD40105BDMSR equivalent, this page delivers verified functional architecture, validated timing behavior across 5V–15V operation, confirmed 16-pin SOIC package mapping, and real-world buffer design implications for bit-rate smoothing and peripheral interfacing.
Technical Context
The CD40105BDMSR implements a ripple-through control logic architecture using cascaded marker flip-flops to track valid data positions; each control stage generates a clock pulse upon detecting a "1→0" transition from its predecessor, enabling autonomous data propagation without external address sequencing.
Its dual asynchronous interface supports independent input/output shifting rates up to 4 MHz at VDD = 15 V, with DIR and DOR flags directly indicating FIFO full/empty states; 3-state output control allows direct bus connection, while master reset clears marker bits without altering stored data contents.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Storage Capacity | 4-bit × 16-word FIFO - supports one 4-bit parallel word per location, enabling 64-bit total elastic storage for burst-to-continuous data rate conversion. |
| Supply Voltage Range | 3 V to 20 V - operates across industrial and military voltage rails; parametrically rated at 5 V, 10 V, and 15 V with guaranteed noise margins. |
| Max Shift Rate | 4 MHz at VDD = 15 V - defines maximum sustainable data throughput when cascading or interfacing with high-speed peripherals. |
| Ripple-Through Delay | 1.4 µs at VDD = 15 V - time for data to propagate from input to output position; critical for end-to-end latency budgeting in real-time acquisition. |
| Input Leakage Current | ≤100 nA at +25°C, VDD = 18 V - ensures minimal standby power draw and stable flag signaling in low-power monitoring applications. |
| Output Drive Strength | ±3.5 mA at VDD = 15 V - sufficient to drive 50 pF loads with <270 ns transition times, supporting reliable bus loading without external buffers. |
| Operating Temperature | −55°C to +125°C - qualified for extended-range environments including avionics, downhole tools, and space-qualified subsystems. |
Pinout & Package
CD40105BDMSR is supplied in a 16-lead SOIC (Small Outline Integrated Circuit) package, designated as DMS (JEDEC MS-012AC), with 1.27 mm pitch and standard surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | D0 | Parallel data input bit 0 - LSB of 4-bit word loaded on rising edge of SHIFT-IN. |
| 2 | D1 | Parallel data input bit 1 - second bit of 4-bit input word. |
| 3 | D2 | Parallel data input bit 2 - third bit of 4-bit input word. |
| 4 | D3 | Parallel data input bit 3 - MSB of 4-bit word accepted during SHIFT-IN pulse. |
| 5 | VSS | Ground reference - common return for all internal logic and I/O circuits. |
| 6 | Q0 | Parallel data output bit 0 - LSB of word presented at output when DATA-OUT READY is asserted. |
| 7 | Q1 | Parallel data output bit 1 - second bit of 4-bit output word. |
| 8 | Q2 | Parallel data output bit 2 - third bit of 4-bit output word. |
| 9 | Q3 | Parallel data output bit 3 - MSB of word available at output latch. |
| 10 | MR | Master Reset - active-high signal that clears all control marker bits to "0", forcing DIR high and DOR low. |
| 11 | SO | Shift-Out - falling-edge-triggered control that advances output pointer and asserts next word onto Q0–Q3. |
| 12 | DOR | Data-Out Ready - open-drain or buffered flag (per package variant) indicating valid data present at Q0–Q3 outputs. |
| 13 | SI | Shift-In - rising-edge-triggered input that latches D0–D3 into first FIFO position when DIR is high. |
| 14 | DIR | Data-In Ready - flag indicating FIFO has at least one empty location; goes low when full (16 words occupied). |
| 15 | 3-STATE | Output Enable - active-low control (per datasheet logic diagram) enabling/disabling Q0–Q3 drivers onto shared bus. |
| 16 | VDD | Positive supply - powers all CMOS circuitry; supports up to 20 V DC with full parametric performance. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Dual Clock Interface | Enables independent input/output data rates - eliminates need for synchronized system clocks between source and sink domains. |
| Self-Propagating Ripple Logic | Removes requirement for external address counters or state machines - data automatically shifts toward output as space becomes available. |
| Real-Time Status Flagging | DIR and DOR provide immediate full/empty indication without polling or command overhead - reduces software latency in embedded controllers. |
| 3-State Output Bus Interface | Allows direct connection to shared data buses without contention - simplifies PCB routing and eliminates need for external bus transceivers. |
| Expandable Architecture | Supports cascading for longer depth (N×16) or wider word size (e.g., 8-bit via parallel CD40105BMS units) - enables scalable buffer design without custom ASICs. |
Applications
| CPU/Terminal Buffering | Data Communications |
|---|---|
Use Scenario: Interfacing a slow serial terminal to a high-speed CPU bus where character arrival is irregular and bursty. IC Role / Device Role / Timing Role: Elastic FIFO absorbs timing mismatch between UART receive rate and CPU read cycle timing. Use Value: Prevents character loss during CPU interrupt latency or bus arbitration delays by holding up to 16 characters until software services the buffer. | Use Scenario: Bridging two asynchronous communication links operating at different baud rates (e.g., RS-232 to RS-485 gateway). IC Role / Device Role / Timing Role: Bit-rate smoothing buffer decouples transmit/receive clock domains while maintaining data order. Use Value: Eliminates inter-symbol jitter and frame misalignment caused by clock domain crossing without requiring PLL-based synchronization. |
| Radar Data Acquisition | Peripheral Buffering |
Use Scenario: Capturing high-pulse-repetition-frequency (PRF) radar return samples before DSP processing. IC Role / Device Role / Timing Role: First-in-first-out temporary storage aligning fast analog-to-digital sampling clock with slower processor DMA transfer schedule. Use Value: Guarantees no sample loss during processor servicing gaps, preserving time-of-arrival integrity for pulse compression algorithms. | Use Scenario: Managing data flow between a microcontroller and a dot-matrix line printer with variable print head movement timing. IC Role / Device Role / Timing Role: Input buffer isolates MCU from printer's mechanical timing constraints and busy-wait cycles. Use Value: Enables uninterrupted MCU execution while printer consumes buffered characters at its own pace - improves system responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD40105BE | Same core functionality but in 16-pin ceramic DIP (H6W) package - no SOIC variant; higher thermal resistance (θJA = 70°C/W vs. ~120°C/W for SOIC). | Preferred for through-hole prototyping or legacy board reuse; unsuitable for high-density SMT layouts. | Select CD40105BE only when DIP mounting or MIL-STD-883 compliance is required; CD40105BDMSR offers superior thermal performance in compact designs. |
| 74HC40105 | Pin-compatible 74HC-series FIFO with identical 4×16 architecture but lower VCC range (2–6 V), faster max clock (20 MHz), and no radiation-hardened qualification. | Suitable for commercial-grade, low-voltage systems; lacks −55°C to +125°C rating and 20 V tolerance of CD40105BDMSR. | Choose 74HC40105 for cost-sensitive consumer applications; CD40105BDMSR remains essential for wide-VDD, extended-temp, or radiation-tolerant deployments. |
Compared with CD40105BE and 74HC40105, the CD40105BDMSR uniquely combines 3–20 V operation, full military temperature range, SOIC packaging, and radiation tolerance - making it the only option for high-reliability embedded systems requiring elastic buffering under extreme electrical or environmental stress.
Availability
CD40105BDMSR is available at Aetrix Electronics and suitable for CPU/terminal buffering, radar data acquisition, and peripheral interfacing requiring stable component supply across extended temperature and voltage ranges.
Supply support for CD40105BDMSR 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
Intersil Corporation (now part of Renesas Electronics) is a U.S.-based semiconductor manufacturer specializing in high-performance analog and mixed-signal ICs for aerospace, defense, and industrial markets.
The CD40105BDMSR belongs to Intersil's legacy "B-series" CMOS logic family, designed specifically for radiation-tolerant, wide-supply, extended-temperature buffering in mission-critical data acquisition and telemetry systems.
FAQ
What is the function of the MASTER RESET (MR) pin on the CD40105BDMSR?
The MASTER RESET (MR) pin on the CD40105BDMSR is an active-high signal that resets all internal control marker bits to "0", forcing DATA-IN READY (DIR) high and DATA-OUT READY (DOR) low. It does not erase stored data - those remain valid but are declared inactive until new data is shifted in. The CD40105BDMSR requires MR to be held high for ≥60 ns at VDD = 15 V to ensure reliable initialization.
Can the CD40105BDMSR operate at 3.3 V supply voltage?
Yes, the CD40105BDMSR is fully functional at 3.3 V, as confirmed by functional testing in Table 1 (Note 4) and Table 4 of the datasheet. At VDD = 3 V, it meets VOH > VDD/2 and VOL < VDD/2 thresholds with guaranteed timing margins, though propagation delays increase versus 5 V operation. The CD40105BDMSR maintains its −55°C to +125°C rating across this voltage range.
How does the CD40105BDMSR indicate FIFO full and empty conditions?
The CD40105BDMSR uses dedicated status flags: DATA-IN READY (DIR) goes low when all 16 word locations are filled - indicating FIFO full; DATA-OUT READY (DOR) goes low when no valid data remains - indicating FIFO empty. Both flags update autonomously via internal ripple logic and require no external polling or address decoding. This behavior is intrinsic to the CD40105BDMSR's marker-bit architecture.
Is the CD40105BDMSR pin-compatible with other 4000-series FIFO devices?
No, the CD40105BDMSR has a unique 16-pin assignment optimized for its ripple-through control architecture and status flag outputs. It is not pin-compatible with CD40107, CD4015, or any other 4000-series device. Pin compatibility is limited to the CD40105B family variants (e.g., CD40105BMS, CD40105BE), which share identical pin functions and ordering - confirmed by the functional diagram and top-view pinout in the CD40105BDMSR datasheet.
What is the maximum capacitive load the CD40105BDMSR outputs can drive reliably?
The CD40105BDMSR outputs are characterized for CL = 50 pF loads, with transition times ≤270 ns and propagation delays specified under that condition. Driving >50 pF may degrade timing margins and increase power dissipation; for heavier loads, external buffer stages are recommended. The CD40105BDMSR's output drive strength (±3.5 mA at VDD = 15 V) supports typical PCB trace and gate capacitance but not long cables or high-fanout buses without amplification.
CD40105BDMSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- B
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- -
- Memory Size:
- 64 (16 x 4)
- Function:
- Asynchronous
- Data Rate:
- 4MHz
- Access Time:
- -
- Voltage - Supply:
- 0 V ~ 20 V
- Current - Supply (Max):
- 10µA
- 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-SBDIP
CD40105BDMSR FAQ
1.How can I place an order for CD40105BDMSR through Aetrix?
Please submit a Request for Quotation (RFQ) for CD40105BDMSR 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 CD40105BDMSR reliable?
The price and inventory of CD40105BDMSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40105BDMSR is usually 5 days.
3.What payment methods are accepted for CD40105BDMSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40105BDMSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD40105BDMSR?
CD40105BDMSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD40105BDMSR 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 CD40105BDMSR?
For technical support, including CD40105BDMSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40105BDMSR requirements.
6.How does Aetrix verify that CD40105BDMSR is sourced from the original manufacturer or authorized distributors?
All CD40105BDMSR 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 CD40105BDMSR meets industry standards.
7.What is the process for return or replacement of CD40105BDMSR?
All CD40105BDMSR units undergo pre-shipment inspection (PSI). If there is an issue with CD40105BDMSR, 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 CD40105BDMSR part is unused and in its original packaging.
Return procedure for CD40105BDMSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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