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Texas Instruments CD74HCT4538M96
- Part No.:
- CD74HCT4538M96
- Manufacturer:
- Texas Instruments
- Category:
- Multivibrators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT4538M96.pdf
- Description:
- IC MULTIVIBRATOR 23NS 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:959
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Product details
Overview
CD74HCT4538M96 from Texas Instruments is a dual retriggerable/resettable monostable multivibrator IC used for precision timing in fixed-voltage digital systems. It delivers independent trigger/reset propagation delays (55 ns max at 4.5 V), Schmitt-trigger inputs on A/B, buffered Q/Q outputs, and operates across -55°C to +125°C with 4.5–5.5 V supply. It enables wide-range pulse width generation via external RX/CX components in industrial control and instrumentation.
For engineers reviewing the CD74HCT4538M96 datasheet, CD74HCT4538M96 pinout, CD74HCT4538M96 application, or CD74HCT4538M96 equivalent, key selection criteria include LSTTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), retrigger time independence from CX, leading/trailing edge triggering flexibility, and SOIC-16 packaging for high-reliability embedded timing circuits.
Technical Context
The CD74HCT4538M96 implements two independent monostable sections, each with separate A (leading-edge) and B (trailing-edge) trigger inputs, dedicated R reset terminals, and Schmitt-trigger input hysteresis for noise immunity. Timing is externally set by resistor RX and capacitor CX, with output pulse width τ ≈ 0.7 × RX × CX and minimum RX = 5 kΩ.
Propagation delays from A/B-to-Q and R-to-Q are independent of RX and CX values, ensuring stable timing across varying external component tolerances. Retrigger time remains constant at ≤175 ns regardless of CX value, supporting reliable pulse extension in burst-mode signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures direct compatibility with standard 5 V LSTTL logic families without level shifting. |
| Input Thresholds | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - Guarantees robust interfacing with legacy TTL outputs and CMOS drivers. |
| Propagation Delay | 55 ns (max, A/B→Q, CL = 50 pF, VCC = 4.5 V) - Supports sub-10 MHz timing resolution in synchronous control loops. |
| Output Pulse Width | 0.63–0.805 ms (RX = 10 kΩ, CX = 0.1 µF, VCC = 5 V) - Enables precise one-shot durations for debounce, delay, and gating functions. |
| Operating Temperature | -55°C to +125°C - Qualified for extended-range operation in aerospace, military, and under-hood automotive environments. |
| Timing Accuracy | ±1% pulse width match between sections - Critical for dual-channel synchronization in differential timing applications. |
| Input Hysteresis | Schmitt-trigger A/B inputs - Rejects noise-induced false triggers in electrically noisy industrial settings. |
Pinout & Package
CD74HCT4538M96 is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.4 mm × 7.4 mm body, and 2.00 mm max height per TI SOP outline NS0016A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1CX / 2CX | External timing capacitor connection for Monostable 1 and 2 - Sets pulse width with associated RX. |
| 2, 14 | 1RXCX / 2RXCX | Combined RX/CX node - Internal connection point for timing network; requires external RX to VCC and CX to GND. |
| 3, 13 | 1R / 2R | Asynchronous reset input - Active-low; forces Q low and Q high independently per section. |
| 4, 12 | 1A / 2A | Leading-edge trigger input - Schmitt-triggered; rising-edge sensitive; unused A tied to GND. |
| 5, 11 | 1B / 2B | Trailing-edge trigger input - Schmitt-triggered; falling-edge sensitive; unused B tied to VCC. |
| 6, 10 | 1Q / 2Q | Inverted output - Buffered, active-low output; drives up to 15 LSTTL loads over full temperature range. |
| 7, 9 | 1Q / 2Q | Non-inverted output - Buffered, active-high output; complements Q for differential signaling or latch enable. |
| 8 | GND | Ground reference - Single ground plane required; decoupling capacitor recommended near pin 8. |
| 16 | VCC | Positive supply - Must be 4.5–5.5 V; bypassing with 0.1 µF ceramic capacitor essential for stable timing. |
Key Features
| Feature | Design Value |
|---|---|
| Retriggerable/Resettable Operation | Each monostable extends its output pulse upon new trigger before timeout - ideal for pulse stretching in serial data framing. |
| Edge-Selective Triggering | Dual A (rising) and B (falling) inputs per section - eliminates need for external inverters in mixed-edge detection. |
| Independent Timing Control | RX/CX networks fully isolated per section - enables asymmetric pulse widths for multi-phase timing sequences. |
| Wide Temperature Range | -55°C to +125°C operation - supports deployment in uncontrolled environments without derating or thermal management. |
| LSTTL Input Compatibility | VIL ≤ 0.8 V, VIH ≥ 2.0 V - interoperates directly with 74LS, 74ALS, and microcontroller GPIO without interface logic. |
Applications
| Industrial Motor Control | Automotive Body Electronics |
|---|---|
Use Scenario: Debouncing mechanical relay contacts and switch inputs in PLC I/O modules. IC Role / Device Role / Timing Role: Dual monostable provides synchronized 10–100 ms clean-up windows for two independent input channels. Use Value: Eliminates contact bounce artifacts without software polling, reducing MCU interrupt load and firmware complexity. | Use Scenario: Generating timed enable pulses for window lift motor drivers during anti-pinch detection cycles. IC Role / Device Role / Timing Role: One-shot generates precise 500 ms safety timeout after obstacle detection signal assertion. Use Value: Meets ISO 11452-4 EMC immunity requirements by avoiding microcontroller-based timing vulnerable to EFT bursts. |
| Test Equipment Signal Generation | Aerospace Avionics Sequencing |
Use Scenario: Creating calibrated delay intervals in automated test fixtures for semiconductor parametric validation. IC Role / Device Role / Timing Role: Dual-section configuration produces matched rising/falling edge delays for skew measurement. Use Value: ±1% inter-channel pulse width match ensures traceable timing accuracy without calibration drift over temperature. | Use Scenario: Power-up sequencing of redundant flight control subsystems requiring staggered activation windows. IC Role / Device Role / Timing Role: Cascaded monostables generate three precisely spaced enable signals from single power-good assertion. Use Value: -55°C to +125°C qualification and radiation-tolerant SOIC packaging meet MIL-PRF-38535 Class K requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC4538M96 | CMOS-input variant (2–6 V operation); VIH/VIL referenced to VCC; higher noise immunity (30% VCC) but no LSTTL compatibility. | Suitable for mixed-supply 3.3 V systems; not drop-in for 5 V TTL interfaces due to incompatible input thresholds. | Select when operating below 4.5 V or requiring wider supply range; verify VIH/VIL margins against driving source. |
| SN74LV4538ADT | Lower voltage (2–5.5 V), LV logic family; 3.3 V optimized; propagation delay ~60 ns at 3.3 V; no CERDIP option. | Better suited for modern low-power portable instrumentation; lacks -55°C rating and military temp range. | Prefer for cost-sensitive commercial designs where extended temperature is not required and 3.3 V operation dominates. |
Compared with CD74HC4538M96 and SN74LV4538ADT, CD74HCT4538M96 uniquely guarantees LSTTL-level input compatibility at 5 V while maintaining full military-grade temperature performance - making it the only choice for legacy 5 V system upgrades requiring zero interface redesign.
Availability
CD74HCT4538M96 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, test equipment signal generation, and aerospace avionics sequencing requiring stable component supply across extreme temperature ranges.
Supply support for CD74HCT4538M96 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 with emphasis on reliability, longevity, and industrial-grade qualification.
CD74HCT4538M96 belongs to TI's High-Speed CMOS Logic family, designed specifically for precision timing applications in harsh environments where deterministic pulse generation, noise immunity, and wide-temperature stability are mandatory.
FAQ
What is the minimum external timing resistor value supported by CD74HCT4538M96?
The CD74HCT4538M96 specifies a minimum external timing resistor RX of 5 kΩ. Using lower values risks exceeding the 30 mA maximum current into pins 2 or 14 (1RXCX/2RXCX), potentially causing timing inaccuracy or device stress. This limit is defined in the Absolute Maximum Ratings and Operating Conditions sections of the TI datasheet SCHS123E.
Can CD74HCT4538M96 operate with a 3.3 V supply?
No, CD74HCT4538M96 is an HCT-type device specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) become non-compliant, and output drive strength degrades significantly. For 3.3 V systems, consider CD74HC4538M96 or SN74LV4538ADT instead.
How does the retrigger time of CD74HCT4538M96 behave with varying CX values?
The retrigger time of CD74HCT4538M96 remains constant at ≤175 ns across all valid CX values, as confirmed in the Switching Specifications table (Figure 11). This independence from CX enables predictable pulse extension behavior even when timing capacitors vary due to temperature or tolerance - a key advantage over basic 555-based solutions.
What is the purpose of the Schmitt-trigger inputs on CD74HCT4538M96 A and B pins?
The Schmitt-trigger inputs on CD74HCT4538M96 A and B pins provide hysteresis (typically ~0.8 V at 5 V), rejecting slow-rising or noisy input edges that could cause multiple false triggers. This ensures clean, single-event response to mechanical switch closures or marginal logic transitions - critical in industrial control and automotive applications.
Is CD74HCT4538M96 pin-compatible with CD74HC4538M96?
Yes, CD74HCT4538M96 and CD74HC4538M96 share identical SOIC-16 pinouts, package dimensions, and terminal functions. However, they differ in input threshold specifications and supply voltage ranges; substituting one for the other requires verification of driving source compatibility and supply rail constraints to avoid functional failure.
CD74HCT4538M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- Yes
- Propagation Delay:
- 23 ns
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HCT4538M96 FAQ
1.How can I place an order for CD74HCT4538M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT4538M96 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 CD74HCT4538M96 reliable?
The price and inventory of CD74HCT4538M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT4538M96 is usually 5 days.
3.What payment methods are accepted for CD74HCT4538M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT4538M96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT4538M96?
CD74HCT4538M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT4538M96 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 CD74HCT4538M96?
For technical support, including CD74HCT4538M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT4538M96 requirements.
6.How does Aetrix verify that CD74HCT4538M96 is sourced from the original manufacturer or authorized distributors?
All CD74HCT4538M96 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 CD74HCT4538M96 meets industry standards.
7.What is the process for return or replacement of CD74HCT4538M96?
All CD74HCT4538M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT4538M96, 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 CD74HCT4538M96 part is unused and in its original packaging.
Return procedure for CD74HCT4538M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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