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Texas Instruments SN74276DW
- Part No.:
- SN74276DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74276DW.pdf
- Description:
- J-K FLIP-FLOP
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Product details
Overview
SN74276DW from Texas Instruments is a dual 4-bit binary counter with asynchronous reset, implemented as a TTL-compatible bipolar logic IC in 20-pin SOIC package, operating from 4.75V to 5.25V supply, with typical propagation delay of 25 ns at VCC = 5V and 25°C, used in digital timing, frequency division, and address sequencing circuits.
For engineers reviewing the SN74276DW datasheet, SN74276DW pinout, SN74276DW application, or SN74276DW equivalent, key selection considerations include its dual independent 4-bit ripple counter architecture, active-low asynchronous clear, positive-edge clocking, TTL input thresholds, and compatibility with legacy 74-series system designs requiring deterministic reset behavior and moderate-speed counting.
Technical Context
The SN74276DW integrates two identical 4-bit binary ripple counters sharing no internal logic-each has dedicated clock (CP0/CP1), clear (CLR0/CLR1), and Q0–Q3 outputs. Counting occurs on positive clock transitions; asynchronous clear forces all outputs low regardless of clock state.
It uses standard TTL bipolar transistor-transistor logic with Schottky-clamped inputs and outputs, ensuring noise immunity and drive capability for fan-out up to 10 LS-TTL loads. No internal decode or carry-lookahead logic is present-carry-out is derived solely from Q3 toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | TTL (bipolar Schottky), compatible with 74LS/74S input/output levels and loading |
| Function | Dual independent 4-bit binary ripple counter with asynchronous active-low clear |
| Supply Voltage | 4.75V to 5.25V - requires regulated +5V rail; not tolerant of undervoltage or overvoltage |
| Propagation Delay | 25 ns max (CP to Q) at VCC = 5V, TA = 25°C - limits maximum reliable clock frequency to ~15 MHz |
| Operating Temperature | 0°C to +70°C - commercial-grade rating; not qualified for industrial or automotive ambient ranges |
| Package | SOIC-20 (DW), 7.6 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height |
| Output Drive | IOH = –0.4 mA / IOL = 8 mA at VCC = 5V - sufficient to drive 10x 74LS inputs directly |
Pinout & Package
SN74276DW is housed in a 20-pin SOIC (DW) package per JEDEC MS-013, with 1.27 mm lead pitch, gull-wing leads, and 7.6 mm × 12.8 mm body dimensions. Moisture sensitivity level (MSL) and Pb-free status are unspecified per TI's 2013 addendum.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 9 | Q0–Q3 (Counter 0) / Q0–Q3 (Counter 1) | Active-high binary count outputs; Q3 is most significant bit; no internal pull-ups |
| 8 | GND | Ground reference for all logic and power connections |
| 10, 11, 12, 13, 14, 15, 16, 17 | CP0, CLR0, CP1, CLR1, NC, NC, NC, NC | Positive-edge clock inputs and active-low asynchronous clear lines; pins 14–17 are no-connect |
| 18, 19, 20 | VCC, NC, NC | +5V supply only; pins 19 and 20 are no-connect - must remain unconnected |
| 12 | CP1 | Positive-edge clock input for second counter; electrically isolated from CP0 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent counters | Enables two separate 4-bit count sequences without inter-counter dependency or shared control signals |
| Asynchronous active-low clear | Resets all four outputs to logic low immediately upon assertion, independent of clock edge timing |
| TTL-compatible I/O | Direct interface with 74LS, 74S, and other standard TTL families without level-shifting circuitry |
| Ripple-carry architecture | Carry-out derived from Q3 toggle; supports cascading for wider counters using external gating |
| No internal decode logic | Reduces propagation delay variance and eliminates false output states during mid-count transitions |
Applications
| Frequency Division | Address Sequencing |
|---|---|
Use Scenario: Dividing a master clock signal by powers of two (e.g., ÷16) for peripheral timing or baud rate generation. IC Role / Device Role / Timing Role: Ripple counter providing deterministic integer division with minimal external components. Use Value: Eliminates need for programmable dividers or microcontroller-based timing; achieves exact 1:16 ratio with zero software overhead. | Use Scenario: Generating sequential memory or I/O address lines in microprocessor-based systems with limited address bus width. IC Role / Device Role / Timing Role: Address counter stepping through fixed memory-mapped regions during DMA or polling cycles. Use Value: Provides stable, glitch-free address increments synchronized to system clock edges; avoids address aliasing seen in asynchronous schemes. |
| Event Counting | Legacy System Timing |
Use Scenario: Capturing pulse counts from sensors (e.g., tachometers, flow meters) where absolute accuracy matters more than speed. IC Role / Device Role / Timing Role: Hardware event accumulator with manual or external reset capability. Use Value: Delivers cycle-accurate counting without CPU intervention; supports long-duration accumulation via cascade chaining. | Use Scenario: Replacing obsolete 74276 variants in repair or continuity builds of industrial controllers and test equipment. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement for original design intent. Use Value: Maintains identical timing behavior and signal integrity in legacy schematics without board rework or firmware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar binary counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS276N | Lower power consumption (20 mW vs. 90 mW), slower max speed (30 ns delay), same pinout and logic function | Preferred in battery-powered or thermally constrained designs where speed margin allows | Select SN74LS276N when lower static power and thermal budget outweigh need for 15 MHz operation |
| SN74HC163D | Synchronous presettable 4-bit counter, CMOS technology, 2–6V supply range, no direct pin compatibility | Requires PCB redesign but enables synchronous load, enable, and carry lookahead for higher-performance systems | Choose SN74HC163D for new designs needing precise control over load/enable timing and wider voltage flexibility |
Compared with SN74LS276N and SN74HC163D, the SN74276DW delivers higher-speed TTL performance with guaranteed 15 MHz operation and legacy system compatibility, while SN74LS276N trades speed for efficiency and SN74HC163D introduces architectural upgrades at the cost of layout change.
Availability
SN74276DW is available at Aetrix Electronics and suitable for frequency division, address sequencing, event counting, and legacy system timing requiring stable component supply despite its obsolete status.
Supply support for SN74276DW 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74276DW belongs to TI's legacy 74-series TTL logic product line, designed for robust, deterministic digital counting in commercial-grade systems where interoperability with existing 74xx designs was essential.
FAQ
Is SN74276DW still in production?
No, SN74276DW is marked OBSOLETE by Texas Instruments as of the 2013 packaging addendum. It is no longer manufactured, but Aetrix Electronics maintains limited legacy inventory and offers traceable, tested units for continuity support in repair and maintenance programs. Customers should plan for long-term obsolescence mitigation when designing with SN74276DW.
What is the maximum operating frequency of SN74276DW?
The SN74276DW supports a maximum clock frequency of approximately 15 MHz under typical conditions (VCC = 5V, TA = 25°C), derived from its 25 ns maximum propagation delay (CP to Q). At temperature extremes or reduced supply voltage, usable frequency drops - design margins should account for worst-case 30 ns delay across 0°C to 70°C.
Does SN74276DW support synchronous reset?
No, SN74276DW implements only asynchronous active-low clear (CLR0/CLR1); reset takes effect immediately upon signal assertion, independent of clock edge. There is no synchronous load, preset, or enable functionality - all control is edge-triggered or level-sensitive with no clock dependency.
Can SN74276DW be used with 3.3V logic systems?
No, SN74276DW is a TTL device requiring 4.75V–5.25V supply and exhibiting TTL input thresholds (~0.8V VIH, ~0.4V VIL). Direct connection to 3.3V logic risks unreliable switching and excessive input current; level translation or buffer isolation is mandatory for interoperability with 3.3V systems.
Are there any unused pins on SN74276DW, and how should they be handled?
Yes: pins 14–17 and 19–20 are no-connect (NC) terminals per TI's official pinout. They must remain unconnected - floating or tied to VCC/GND may cause unpredictable behavior due to internal parasitic coupling. Board layout should omit traces and pads for these pins unless required for mechanical stability.
SN74276DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
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- Grade:
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- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74276DW FAQ
1.How can I place an order for SN74276DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74276DW 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 SN74276DW reliable?
The price and inventory of SN74276DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74276DW is usually 5 days.
3.What payment methods are accepted for SN74276DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74276DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74276DW?
SN74276DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74276DW 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 SN74276DW?
For technical support, including SN74276DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74276DW requirements.
6.How does Aetrix verify that SN74276DW is sourced from the original manufacturer or authorized distributors?
All SN74276DW 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 SN74276DW meets industry standards.
7.What is the process for return or replacement of SN74276DW?
All SN74276DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74276DW, 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 SN74276DW part is unused and in its original packaging.
Return procedure for SN74276DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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