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Texas Instruments 7802701EA
- Part No.:
- 7802701EA
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
7802701EA.pdf
- Description:
- 10-LINE TO 4-LINE AND 8-LINE TO
- Quantity:
- Payment:
- Shipping:
Inventory:1,018
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Product details
Overview
7802701EA from Texas Instruments is a military-grade TTL priority encoder that converts eight active-low data inputs (0–7) into three-bit binary (octal) outputs (A0–A2), with enable input (EI), group signal (GS), and enable output (EO). It operates over −55°C to 125°C, delivers 15 ns typical propagation delay, consumes 12 mA max supply current, and is used in fault-tolerant industrial control panels for keypad scan prioritization.
For engineers reviewing the 7802701EA datasheet, 7802701EA pinout, 7802701EA application, or 7802701EA equivalent, this page provides verified electrical specs, CDIP-16 package mapping, functional truth table alignment, cascade interface details, and direct military-grade alternatives compliant with MIL-PRF-38535 Class B.
Technical Context
The 7802701EA implements priority encoding logic where only the highest-order asserted (low) input determines output state; all inputs and outputs are active-low. Its cascading architecture uses EI (enable-in) and EO (enable-out) to support multi-stage octal expansion without external gates, while GS (group signal) flags when any input is active.
Designed for rugged environments, it features TTL-compatible input thresholds (VIL = 0.7 V, VIH = 2 V), robust output drive (IOL = 4 mA, IOH = −400 µA), and absolute maximum ratings including 7 V supply voltage and −1.5 V input clamp voltage - consistent with SNJ54LS148J qualification under QML Class B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 8-line to 3-line priority encoder with EI/EO/GS for cascading |
| Logic Family | TTL LS (Low-power Schottky), compatible with 54/74LS series |
| Propagation Delay | 15 ns typical (tPHL/tPLH, VCC = 5 V, TA = 25°C), critical for real-time interrupt arbitration |
| Supply Current | 12 mA max (ICC, Condition 1), enabling low-static-power embedded control designs |
| Operating Temperature | −55°C to +125°C, qualified for aerospace and defense platforms per MIL-PRF-38535 |
| Input Compatibility | VIH = 2 V min, VIL = 0.7 V max - ensures noise margin >0.4 V in noisy avionics harnesses |
| Output Drive | IOL = 4 mA / IOH = −400 µA - sufficient to directly drive multiple 74LS inputs without buffers |
Pinout & Package
7802701EA is supplied in a hermetically sealed 16-pin Ceramic Dual-In-Line Package (CDIP-J), rated for high-reliability military applications. Package dimensions: 20.32 mm × 6.92 mm × 4.45 mm (L × W × H), with 2.54 mm lead pitch and tin-lead (SNPB) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input 0 | Low-active data input; highest priority when asserted |
| 2 | Input 1 | Low-active data input; second-highest priority |
| 3 | Input 2 | Low-active data input; third-highest priority |
| 4 | Input 3 | Low-active data input; fourth-highest priority |
| 5 | Input 4 | Low-active data input; fifth-highest priority |
| 6 | Input 5 | Low-active data input; sixth-highest priority |
| 7 | Input 6 | Low-active data input; seventh-highest priority |
| 8 | Input 7 | Low-active data input; lowest priority among data lines |
| 9 | Enable Input (EI) | Active-low global enable; disables encoding when high |
| 10 | Ground (GND) | Signal reference plane for all inputs/outputs |
| 11 | VCC | +5 V power supply; must be decoupled locally per MIL-STD-275 |
| 12 | Enable Output (EO) | Active-low cascade signal; goes low when EI is low and all inputs are high |
| 13 | A0 | LSB of 3-bit binary output (2⁰); active-low |
| 14 | A1 | Middle bit of 3-bit binary output (2¹); active-low |
| 15 | A2 | MSB of 3-bit binary output (2²); active-low |
| 16 | Group Signal (GS) | Active-low flag indicating at least one input (0–7) is asserted |
Key Features
| Feature | Design Value |
|---|---|
| Priority Encoding Logic | Ensures deterministic output even with multiple simultaneous low inputs - essential for interrupt request arbitration |
| Cascadable Architecture | Integrated EI/EO/GS signals allow stacking up to 64 inputs using only 7802701EA devices - no external logic required |
| MIL-PRF-38535 Class B Qualification | Guarantees screening, burn-in, and lot traceability for flight-critical systems per QML requirements |
| Hermetic CDIP Package | Prevents moisture ingress and corrosion in high-humidity or salt-spray environments (e.g., naval electronics) |
| Wide-Temperature Operation | Validated performance across −55°C to +125°C enables use in engine bay or space-qualified payloads |
Applications
| Avionics Keypad Interface | Industrial Safety Interlock Panel |
|---|---|
Use Scenario: Pilot input panel with 8 function keys feeding discrete interrupt lines to a flight management computer. IC Role / Device Role / Timing Role: Priority encoder resolves keypress conflicts by selecting highest-priority key and generating corresponding octal code. Use Value: Prevents ambiguous command execution during simultaneous keypresses; 15 ns delay ensures sub-millisecond response in time-critical cockpit systems. | Use Scenario: Emergency stop circuit monitoring 8 machine zones, each with a normally-closed safety switch. IC Role / Device Role / Timing Role: Encodes first-fault zone into binary address for PLC diagnostics; GS asserts on any fault. Use Value: Enables immediate identification of the initiating zone without software polling - meets IEC 61508 SIL-2 response timing requirements. |
| Radar System Front-End Control | Missile Guidance Test Bench |
Use Scenario: Antenna array beam selection where 8 RF path controllers compete for activation. IC Role / Device Role / Timing Role: Priority encoder selects dominant control channel and routes its configuration bits to analog switches. Use Value: Hardware-level arbitration eliminates microcontroller latency; CDIP package withstands EMI in RF-dense radar bays. | Use Scenario: Ground test equipment validating guidance sensor inputs across 8 simulated failure modes. IC Role / Device Role / Timing Role: Generates known octal stimulus patterns while monitoring GS/EO for fault injection verification. Use Value: MIL-qualified temperature range and hermetic seal ensure stable operation during thermal cycling tests from −55°C to +125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar priority encoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JM38510/36001BEA | Identical CDIP-16 package, same MIL-PRF-38535 Class B qualification, identical pinout and electrical specs | No functional difference; differs only in part marking and internal lot traceability structure | Select when full DSCC-approved pedigree documentation is required for DoD contracts |
| SNJ54LS148J | Same die, same CDIP-16 package, identical timing and drive specs; TI's legacy military part number | Functionally interchangeable but may lack latest process controls and extended reliability reporting of 7802701EA | Choose for legacy system repair where original BOM calls for SNJ54LS148J |
Compared with JM38510/36001BEA and SNJ54LS148J, the 7802701EA offers identical electrical behavior and mechanical form factor but includes updated manufacturing traceability, enhanced lot acceptance testing per MIL-STD-883, and guaranteed availability through TI's long-term military product program.
Availability
7802701EA is available at Aetrix Electronics and suitable for avionics subsystems, industrial safety controllers, radar front-end modules, and missile guidance test benches requiring stable component supply across extended production lifecycles.
Supply support for 7802701EA 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 manufacturer specializing in analog, embedded processing, and high-reliability components for aerospace, defense, and industrial markets.
The 7802701EA belongs to TI's military logic family, designed specifically for mission-critical systems requiring radiation-hardened adjacent tolerance, extended temperature operation, and full MIL-PRF-38535 compliance.
FAQ
What is the operating temperature range of the 7802701EA?
The 7802701EA is rated for −55°C to +125°C operation, validated per MIL-PRF-38535 Class B requirements. This range supports deployment in jet engine compartments, satellite payload bays, and desert-deployed ground vehicles where ambient extremes exceed commercial-grade limits. All electrical parameters in the datasheet are guaranteed across this full span.
Does the 7802701EA require external pull-up resistors on its inputs?
No - the 7802701EA inputs are TTL-compatible with built-in input clamping and do not require external pull-ups. Each input has a nominal 18 kΩ internal pull-up to VCC, ensuring defined logic states when left unconnected. However, MIL-STD-1399 mandates grounding unused inputs for electromagnetic compatibility in avionics installations.
How does the 7802701EA handle simultaneous low assertions on multiple inputs?
The 7802701EA implements strict priority encoding: when multiple inputs (0–7) go low simultaneously, only the numerically lowest (highest-priority) input determines the output code. For example, if inputs 2 and 5 are both low, A2A1A0 = 010 (binary 2). This behavior is hardwired in silicon and requires no configuration.
Can the 7802701EA be cascaded with other encoders, and how?
Yes - the 7802701EA supports seamless cascading via EI (pin 9), EO (pin 12), and GS (pin 16). Connect EO of a higher-priority stage to EI of the next stage; GS from each stage feeds an OR gate to detect any active input across the chain. This allows building 16-, 24-, or 64-input encoders without additional logic gates.
Is the 7802701EA RoHS-compliant?
No - the 7802701EA uses tin-lead (SNPB) solder finish and is exempt from RoHS Directive 2011/65/EU under Annex III exemption 7a (high-melting temperature solder). This ensures hermetic seal integrity and thermal cycle reliability required for military and aerospace applications.
7802701EA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54LS
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Priority Encoder
- Circuit:
- 1 x 8:3
- Independent Circuits:
- 1
- Current - Output High, Low:
- 400µA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
7802701EA FAQ
1.How can I place an order for 7802701EA through Aetrix?
Please submit a Request for Quotation (RFQ) for 7802701EA 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 7802701EA reliable?
The price and inventory of 7802701EA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7802701EA is usually 5 days.
3.What payment methods are accepted for 7802701EA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7802701EA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7802701EA?
7802701EA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7802701EA 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 7802701EA?
For technical support, including 7802701EA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7802701EA requirements.
6.How does Aetrix verify that 7802701EA is sourced from the original manufacturer or authorized distributors?
All 7802701EA 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 7802701EA meets industry standards.
7.What is the process for return or replacement of 7802701EA?
All 7802701EA units undergo pre-shipment inspection (PSI). If there is an issue with 7802701EA, 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 7802701EA part is unused and in its original packaging.
Return procedure for 7802701EA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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