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Renesas CD40105BKMSR
- Part No.:
- CD40105BKMSR
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 16-CFlatPack
- Datasheet:
-
CD40105BKMSR.pdf
- Description:
- RENESAS
- Quantity:
- Payment:
- Shipping:
Inventory:4,546
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Product details
Overview
CD40105BKMSR from Intersil is a CMOS FIFO register providing 4-bit × 16-word elastic buffering for asynchronous data rate matching, with independent shift-in/shift-out clocks, 3-state outputs, and status flags (DATA-IN READY and DATA-OUT READY). It operates from 3V to 20V, supports -55°C to +125°C, and is used in radar data acquisition and CPU/terminal buffering.
For engineers reviewing the CD40105BKMSR datasheet, CD40105BKMSR pinout, CD40105BKMSR application, or CD40105BKMSR equivalent, key selection criteria include its 16-word depth, 3-state output control, master reset functionality, voltage range scalability (5V/10V/15V parametric ratings), and ripple-through propagation timing under varying VDD conditions.
Technical Context
The CD40105BKMSR implements a marker-bit–based control architecture where each of 16 positions uses a flip-flop to track occupancy; "1" indicates valid data, "0" denotes vacancy. Data transfer occurs via edge-triggered ripple logic: a low-to-high SI pulse shifts data forward when the preceding position is filled and current position is empty.
Status signaling is intrinsic: DIR (pin 1) goes high when space is available at input; DOR (pin 15) goes high when valid data reaches output. Master Reset (MR, pin 16) clears all marker bits to "0", invalidating contents without altering stored data values. All inputs are COS/MOS protected; outputs drive 50pF loads with specified transition times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth | 16 words × 4 bits - provides fixed elastic buffer capacity for rate-matching between mismatched clock domains. |
| Supply Voltage Range | 3V to 20V - enables operation across legacy 5V, industrial 10V/15V, and high-voltage test systems. |
| Propagation Delay (VDD = 5V) | ≤ 4.0 µs ripple-through - determines maximum latency between input load and output availability. |
| Max Shift Rate (VDD = 15V) | 4 MHz - sets upper bound on sustained data throughput in high-VDD configurations. |
| Input Leakage (VDD = 18V, +25°C) | ±100 nA - ensures minimal standby current draw in battery-backed or low-power monitoring applications. |
| Output Drive (VDD = 15V) | Sink: 3.5 mA / Source: -3.5 mA - sufficient to drive standard CMOS loads and small bus capacitances without external buffers. |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, downhole, and military embedded environments. |
Pinout & Package
CD40105BKMSR is supplied in a 16-lead ceramic flatpack (H6W) package with 0.300-inch body width and 0.050-inch lead pitch. Pin numbering follows standard dual-inline top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Data-In Ready flag output | High = FIFO has space for next 4-bit word; used to gate shift-in pulses in handshaking protocols. |
| 2 (SI) | Shift-In clock input | Low-to-high edge loads one 4-bit word into first position if DIR is high. |
| 3–6 (D0–D3) | Data input lines | Parallel 4-bit input bus synchronized to SI edge; latched only when DIR is asserted. |
| 7 (VSS) | Ground reference | Primary return path for all internal logic and I/O; must be low-impedance for noise margin integrity. |
| 8 (D3) | Data input line | LSB of 4-bit parallel input bus (redundant labeling per datasheet top view; confirmed as D3). |
| 9 (VDD) | Positive supply | Single rail powering entire register and control logic; supports 3V–20V operation with full parametric rating. |
| 10 (DOR) | Data-Out Ready flag output | High = valid data present at Q0–Q3; used to enable SO edge detection for unload sequencing. |
| 11–14 (Q0–Q3) | Data output lines | Parallel 4-bit output bus enabled only when 3-state control (pin 13) is low. |
| 13 (3-STATE) | Output enable control | Low = Q0–Q3 active; high = high-impedance - allows direct connection to shared data buses. |
| 15 (SO) | Shift-Out clock input | Falling edge unloads current word from Q0–Q3 and advances next word to output position. |
| 16 (MR) | Master Reset input | High pulse clears all marker bits to "0", forcing DIR high and DOR low; data contents remain but are marked invalid. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous FIFO architecture | Enables seamless bridging between independent clock domains without requiring common timing references. |
| Expandable in either direction | Multiple CD40105BKMSR devices can be cascaded lengthwise (16×N) or widened (N×4) using DIR/DOR interconnect and AND-gated controls. |
| 3-state output drivers | Permits direct integration into multiplexed data buses without external bus transceivers or isolation logic. |
| Status flag outputs (DIR/DOR) | Eliminates need for external handshake logic or polling-hardware-ready signals simplify controller firmware design. |
| Wide supply range (3V–20V) | Reduces BOM count across mixed-voltage systems and supports legacy 15V industrial backplanes. |
| Rad-hardened design (MIL-STD-883 compliant) | Qualified for total ionizing dose up to 100 krad(Si); suitable for space-qualified and nuclear instrumentation applications. |
Applications
| Radar Data Acquisition | CPU/Terminal Buffering |
|---|---|
Use Scenario: Capturing burst-mode analog-to-digital samples from pulsed radar receivers with variable PRF. IC Role / Device Role / Timing Role: Elastic buffer absorbing timing jitter between ADC sampling clock and downstream DSP processing clock. Use Value: Prevents sample loss during PRF transitions by decoupling front-end digitization from fixed-rate analysis pipelines. |
Use Scenario: Interfacing a 1-MHz UART terminal to a 10-MHz microprocessor bus. IC Role / Device Role / Timing Role: Asynchronous interface FIFO managing data flow between mismatched serial and parallel clock domains. Use Value: Eliminates processor polling overhead and guarantees no character loss during high-speed bursts. |
| Line Printer Input Buffers | Auto Dialer Modem Interfaces |
Use Scenario: Storing ASCII print jobs from host PC before mechanical line feed execution. IC Role / Device Role / Timing Role: First-in-first-out storage holding characters until printer mechanics complete prior line advance. Use Value: Enables continuous host transmission while accommodating slow electromechanical response time. |
Use Scenario: Buffering AT command sequences and modem response strings in embedded dial-up controllers. IC Role / Device Role / Timing Role: Dual-handshake FIFO isolating UART framing timing from modem internal state machine delays. Use Value: Prevents command overrun and ensures reliable echo/response synchronization in noisy PSTN environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD40107BMS | 8-bit × 8-word configuration; lacks DIR/DOR status flags and master reset; no 3-state outputs. | Suitable only for fixed-depth, synchronous buffering where external handshaking is implemented. | Select CD40107BMS only when depth requirement is halved and system-level control logic already exists. |
| 74HC40105 | Same 4×16 architecture but TTL-compatible 2V–6V supply; faster max rate (20 MHz @ 4.5V); not radiation-hardened. | Better suited for commercial-grade high-speed digital systems, not aerospace/military deployments. | Choose 74HC40105 for cost-sensitive, non-radiation environments requiring higher bandwidth and lower VDD. |
Compared with CD40105BKMSR, CD40107BMS offers reduced depth and no status signaling-requiring external control logic-while 74HC40105 trades radiation tolerance and wide-VDD flexibility for speed and commercial process economics.
Availability
CD40105BKMSR is available at Aetrix Electronics and suitable for radar data acquisition, CPU/terminal buffering, and line printer input buffering requiring stable component supply across extended temperature and radiation-exposed environments.
Supply support for CD40105BKMSR 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 is a U.S.-based semiconductor manufacturer specializing in high-reliability analog and mixed-signal ICs for aerospace, defense, and industrial markets.
The CD40105BKMSR belongs to Intersil's legacy CMOS B-series logic family, designed specifically for radiation-tolerant, wide-supply asynchronous interfacing in mission-critical embedded systems.
FAQ
What is the function of the DIR and DOR pins on the CD40105BKMSR?
The DIR (Data-In Ready) pin is an open-drain output that goes high when at least one empty location exists at the input end, enabling safe shift-in pulses. The DOR (Data-Out Ready) pin goes high when valid data occupies the output position, signaling readiness for shift-out. Both are essential for hardware handshaking and eliminate software polling in the CD40105BKMSR's asynchronous operation.
Does the CD40105BKMSR retain data during Master Reset?
Yes-the CD40105BKMSR retains stored data values in its 4×16 register during Master Reset (MR high), but resets all 16 marker bits to "0". This invalidates the data logically: DIR goes high (indicating space), DOR goes low (no valid output), and subsequent SI pulses begin overwriting from position 1. The CD40105BKMSR's data retention behavior is explicitly documented in the functional description.
Can multiple CD40105BKMSR devices be cascaded to increase depth?
Yes-CD40105BKMSR supports cascading to form longer FIFOs: connect DIR of upstream device to SO of downstream device, and DOR of upstream to SI of downstream. A Master Reset pulse must be applied after power-up in cascaded configurations. Expansion beyond 16 words requires external AND gating of DIR/DOR signals, as detailed in Figures 9 and 11 of the CD40105BKMSR datasheet.
What is the minimum pulse width required for Shift-In on the CD40105BKMSR?
At VDD = 15V, the minimum Shift-In (SI) pulse width is 60 ns; at VDD = 10V it is 80 ns; and at VDD = 5V it is 200 ns. These values are specified in Table 6 (Minimum Shift In Pulse Width, TW) and are guaranteed across the full operating temperature range. Meeting these widths ensures reliable data capture into the CD40105BKMSR's first position.
Is the CD40105BKMSR compatible with 3.3V logic systems?
Yes-the CD40105BKMSR is fully functional at VDD = 3V, with characterized performance including functional operation, input thresholds, and propagation delays. Table 3 confirms DC and AC parameters at 3V, and the functional test (Note 4) explicitly validates operation down to VDD = 2.8V. Thus, the CD40105BKMSR supports direct interfacing with 3.3V systems when powered at 3V.
CD40105BKMSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- B
- Package/Case:
- 16-CFlatPack
- 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:
- Surface Mount
- Supplier Device Package:
- 16-CFlatPack
CD40105BKMSR FAQ
1.How can I place an order for CD40105BKMSR through Aetrix?
Please submit a Request for Quotation (RFQ) for CD40105BKMSR 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 CD40105BKMSR reliable?
The price and inventory of CD40105BKMSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40105BKMSR is usually 5 days.
3.What payment methods are accepted for CD40105BKMSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40105BKMSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD40105BKMSR?
CD40105BKMSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD40105BKMSR 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 CD40105BKMSR?
For technical support, including CD40105BKMSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40105BKMSR requirements.
6.How does Aetrix verify that CD40105BKMSR is sourced from the original manufacturer or authorized distributors?
All CD40105BKMSR 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 CD40105BKMSR meets industry standards.
7.What is the process for return or replacement of CD40105BKMSR?
All CD40105BKMSR units undergo pre-shipment inspection (PSI). If there is an issue with CD40105BKMSR, 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 CD40105BKMSR part is unused and in its original packaging.
Return procedure for CD40105BKMSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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