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Texas Instruments CD4541BNS
- Part No.:
- CD4541BNS
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
CD4541BNS.pdf
- Description:
- IC OSC PROG TIMER 100KHZ 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,800
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Product details
Overview
CD4541BNS from Texas Instruments is a CMOS programmable timer IC featuring a 16-stage binary counter, built-in RC oscillator (DC to 100 kHz), and dual-mode operation (2N frequency divider or single-transition timer). It supports VDD up to 20V, operates from –55°C to +125°C, and delivers symmetrical 100Ω output drive-used in precision timing circuits for industrial control and power supply sequencing.
For engineers reviewing the CD4541BNS datasheet, CD4541BNS pinout, CD4541BNS application, or CD4541BNS equivalent, key selection considerations include its programmable division ratio (28, 210, 213, or 216), Q/Q output logic flexibility, AUTO/MANUAL reset control, and compatibility with external clock input on Pin 3.
Technical Context
The CD4541BNS implements a 16-bit ripple-carry binary counter with positive-edge clock triggering and asynchronous MASTER RESET. Its internal RC oscillator uses external RT, CT, and RS components to generate frequencies from DC to 100 kHz, calculable via f = 1/(2.3 × RTCT). The AUTO RESET circuit disables oscillator activity during power-on reset to minimize quiescent current.
Output mode is selected by MODE (Pin 10): logic "1" enables continuous square-wave division; logic "0" configures single-transition timing with output transition after 2N−1 counts. Time-select inputs A (Pin 12) and B (Pin 13) determine N = 8, 10, 13, or 16 stages, while Q/Q SELECT (Pin 9) chooses active-high or active-low output polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 3V to 18V (full temp range); 20V absolute max - enables high-voltage industrial timing without level-shifting |
| Oscillator Frequency | DC to 100 kHz - supports ultra-slow timing (e.g., hour-scale delays) and fast clock division up to 100 kHz |
| Counter Stages | 16-bit binary with selectable 8/10/13/16-stage output - provides precise division ratios of 256, 1024, 8192, or 65536 |
| Output Drive | ±12.6 mA at VDD = 15V - directly drives 6 LPTTL, 3 LS TTL, or 6 HTL loads across full temperature range |
| Propagation Delay | 0.9 μs (tPHL/tPLH, 216 path, VDD = 15V) - ensures predictable timing margins in critical control loops |
| Quiescent Current | 0.08 μA max at VDD = 20V, TA = 25°C - ultra-low standby power for battery-backed or energy-sensitive systems |
| Operating Temp | –55°C to +125°C - qualified for aerospace, military, and under-hood automotive applications |
Pinout & Package
CD4541BNS is supplied in a 14-lead SOP (Small Outline Package) with standard SOIC pin spacing (1.27 mm pitch) and JEDEC MS-012AC outline. Package dimensions: 8.65 mm × 3.91 mm × 1.75 mm (L × W × H), RoHS-compliant, moisture sensitivity level (MSL) Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RTC) | RC Oscillator Timing Capacitor | Connects external timing capacitor CT; sets oscillator frequency with RT and RS |
| 2 (RS) | RC Oscillator Bias Resistor | Provides bias current for internal oscillator; RS ≥ 10 kΩ required for stable operation |
| 3 (CLK) | External Clock Input | Accepts external clock signal instead of internal oscillator; enables precise frequency control |
| 4 (NC) | No Connect | Not internally bonded; must be left unconnected or tied to VSS/VDD per layout guidelines |
| 5 (AR) | AUTO RESET Control | Logic "0" enables automatic power-on reset; logic "1" disables auto-reset for low-power operation |
| 6 (MR) | MASTER RESET Input | Active-high asynchronous reset; forces counter to zero and initializes output state |
| 7 (VSS) | Ground Reference | Primary ground return for all internal logic and output drivers; requires low-impedance PCB connection |
| 8 (Q) | Inverted Output Terminal | Complementary output to Pin 9; toggles or transitions based on MODE and time-select configuration |
| 9 (Q/Q SELECT) | Output Polarity Select | Logic "0" selects Q (active-low output); logic "1" selects Q̅ (active-high output) |
| 10 (MODE) | Operation Mode Select | Logic "1" = continuous 2N divide-by; logic "0" = single-transition one-shot timing mode |
| 11 (NC) | No Connect | Not internally bonded; must be left unconnected or tied to VSS/VDD per layout guidelines |
| 12 (A) | Time-Select Input A | LSB of 2-bit time-select code; combined with Pin 13 determines division ratio (28, 210, 213, 216) |
| 13 (B) | Time-Select Input B | MSB of 2-bit time-select code; defines counter stage tapped for output (8th, 10th, 13th, or 16th) |
| 14 (VDD) | Positive Supply Rail | CMOS supply input; accepts 3V–18V; decoupling capacitor (0.1 μF) required near pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Division Ratio | Selects exact 28, 210, 213, or 216 output frequency division via A/B inputs - eliminates need for external divider chains |
| Dual-Mode Operation | Switches between continuous square-wave generation (MODE = 1) and retriggerable one-shot timing (MODE = 0) - supports both clocking and event-triggered functions |
| Low-Power RC Oscillator | Self-contained oscillator requiring only two resistors and one capacitor - reduces BOM count and board space vs. crystal-based solutions |
| Output Logic Flexibility | Q/Q SELECT (Pin 9) and MODE (Pin 10) jointly configure active-high/low output and toggle/transition behavior - simplifies interface to downstream logic |
| High-Voltage Tolerance | Rated for 20V absolute maximum VDD and –0.5V to VDD+0.5V input range - enables direct use in 12V/15V industrial power domains |
| Robust Reset Architecture | Separate AUTO RESET (Pin 5) and MASTER RESET (Pin 6) inputs allow power-on initialization and runtime synchronization - prevents spurious outputs during brownout |
Applications
| Industrial Power Sequencing | Automotive Engine Control Timing |
|---|---|
Use Scenario: Delayed turn-on of auxiliary power rails after main supply stabilization in PLC backplanes. IC Role / Device Role / Timing Role: Single-transition timer generating precise 213 = 8192-cycle delay using internal RC oscillator. Use Value: Eliminates external monostable multivibrator and associated passive components; achieves ±5% timing accuracy over –40°C to +85°C. |
Use Scenario: Generating camshaft position reference pulses synchronized to crankshaft rotation in diesel engine ECU. IC Role / Device Role / Timing Role: 216 frequency divider accepting external 1 MHz clock input on Pin 3 to produce 15.26 Hz reference signal. Use Value: Provides deterministic jitter-free division without PLL lock time; withstands 125°C ambient under-hood conditions. |
| Military System Watchdog Timer | Medical Infusion Pump Dose Interval Control |
Use Scenario: Supervising microcontroller health in airborne avionics by asserting reset if no periodic MR pulse is received within 210 = 1024 ms window. IC Role / Device Role / Timing Role: Retriggerable one-shot configured in MODE = 0 with A/B = 01, driven by MCU watchdog strobe. Use Value: Guarantees fail-safe reset within 1.024 s tolerance; operates reliably across –55°C to +125°C military temperature range. |
Use Scenario: Controlling 15-minute dose intervals in portable infusion pumps powered by 9V alkaline batteries. IC Role / Device Role / Timing Role: Ultra-low-power timer operating at VDD = 9V with AUTO RESET disabled, drawing <0.1 μA quiescent current. Use Value: Extends battery life beyond 12 months; eliminates need for microcontroller wake-up cycles and associated software overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4541BM | Same die, SOIC-14 package with different marking and tape/reel packaging (D package vs NS) | Identical electrical specs and pinout; differs only in reel quantity (50 vs 2000) and MSL handling | Preferred for prototyping or low-volume builds where smaller reels reduce inventory cost |
| CD4541BPWR | Same die, TSSOP-14 package (PW) with 4.4 mm width vs SOP's 3.91 mm; identical thermal performance (θJA = 113°C/W) | Enables higher PCB density in space-constrained medical or portable designs; same –55°C to +125°C rating | Chosen when board area is premium and automated assembly supports fine-pitch TSSOP handling |
Compared with CD4541BNS, CD4541BM offers identical functionality in a legacy SOIC format ideal for hand-soldering or mixed-technology boards, while CD4541BPWR provides 12% smaller footprint for high-density layouts-neither requires PCB redesign due to shared 14-pin SOIC-compatible pinout and identical electrical behavior.
Availability
CD4541BNS is available at Aetrix Electronics and suitable for industrial power sequencing, automotive engine control timing, military system watchdog timers, and medical infusion pump dose interval control requiring stable component supply across extended temperature ranges.
Supply support for CD4541BNS 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 CMOS technology development.
The CD4541BNS belongs to TI's CD4000-series high-voltage CMOS logic family, designed specifically for robust timing, counting, and control functions in harsh environments including aerospace, defense, and industrial automation.
FAQ
What is the maximum operating voltage for CD4541BNS?
The CD4541BNS has an absolute maximum VDD rating of +20V, with guaranteed parametric operation from 3V to 18V across its full –55°C to +125°C temperature range. At 15V supply, it delivers ±12.6 mA output drive and maintains propagation delay below 2.9 μs for the 216 path. Exceeding 20V risks permanent damage per Absolute Maximum Ratings.
Can CD4541BNS operate without external timing components?
Yes, CD4541BNS can operate without external timing components when used with an external clock applied to Pin 3. Its internal RC oscillator requires RTC, CTC, and RS (Pins 1, 2, and 3), but bypassing the oscillator by driving Pin 3 directly allows fully digital clock input - enabling precise frequency control independent of resistor/capacitor tolerances and temperature drift.
How does the AUTO RESET function affect power consumption in CD4541BNS?
When AUTO RESET (Pin 5) is enabled (logic "0"), CD4541BNS draws additional quiescent current: up to 500 μA max at 15V and 125°C. Disabling AUTO RESET (Pin 5 = logic "1") eliminates this overhead, reducing total IDD to ≤0.08 μA at 20V - critical for battery-powered applications where every nanoamp matters.
Which counter stages are accessible as outputs on CD4541BNS?
CD4541BNS provides output from the 8th, 10th, 13th, or 16th counter stage, selected by the A (Pin 12) and B (Pin 13) inputs per the Frequency Selection Table. This yields division ratios of 28 = 256, 210 = 1024, 213 = 8192, or 216 = 65536 - no other stages (e.g., 12th or 14th) are routed to the output multiplexer.
Is CD4541BNS pin-compatible with older CD4541 variants like CD4541BE?
Yes, CD4541BNS is pin-compatible with all CD4541B variants including CD4541BE (PDIP), CD4541BM (SOIC), and CD4541BPW (TSSOP) - all share identical 14-pin assignments, electrical specifications, and functional behavior. The "NS" suffix denotes SOP packaging, but the die, pinout, and timing parameters are fully interchangeable.
CD4541BNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Programmable Timer
- Count:
- 65536
- Frequency:
- 100kHz
- Voltage - Supply:
- 3V ~ 20V
- Current - Supply:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 14-SOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
CD4541BNS FAQ
1.How can I place an order for CD4541BNS through Aetrix?
Please submit a Request for Quotation (RFQ) for CD4541BNS 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 CD4541BNS reliable?
The price and inventory of CD4541BNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD4541BNS is usually 5 days.
3.What payment methods are accepted for CD4541BNS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD4541BNS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD4541BNS?
CD4541BNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD4541BNS 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 CD4541BNS?
For technical support, including CD4541BNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD4541BNS requirements.
6.How does Aetrix verify that CD4541BNS is sourced from the original manufacturer or authorized distributors?
All CD4541BNS 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 CD4541BNS meets industry standards.
7.What is the process for return or replacement of CD4541BNS?
All CD4541BNS units undergo pre-shipment inspection (PSI). If there is an issue with CD4541BNS, 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 CD4541BNS part is unused and in its original packaging.
Return procedure for CD4541BNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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