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Texas Instruments 85097012A
- Part No.:
- 85097012A
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-CLCC
- Datasheet:
-
85097012A.pdf
- Description:
- QUAD 2-LINE TO 1-LINE DATA SELEC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
85097012A from Texas Instruments is a military-grade 4-bit dual 2-line-to-1 data selector/multiplexer with 3-state outputs, designed for bus-organized systems requiring high-speed signal routing and bus isolation. It operates across −55°C to 125°C, features 20-pin LCCC (FK) ceramic package, supports A/B select control, and delivers tPLH/tPHL ≤ 12 ns (A/B → Y) at VCC = 5 V. It enables multiplexing of two 4-bit data sources onto four shared output lines in high-reliability avionics and defense computing backplanes.
For engineers reviewing the 85097012A datasheet, 85097012A pinout, 85097012A application, or 85097012A equivalent, this page provides verified functional identity, military temperature-range operation, 3-state bus interface capability, LCCC package mechanical data, and direct substitution guidance for SN54ALS257A-compatible designs.
Technical Context
The 85097012A implements dual independent 2:1 multiplexers per data bit - each with separate A/B select input and common output-enable (OE) - enabling simultaneous selection of one of two 4-bit inputs (A or B) onto four 3-state outputs (1Y–4Y). Its logic architecture uses ALS (Advanced Low-Power Schottky) TTL technology, delivering low power consumption (ICC ≤ 14 mA at VCC = 5.5 V, outputs disabled) while maintaining compatibility with standard TTL voltage thresholds.
It supports true 3-state output control: when OE is high, all outputs enter high-impedance state without loading the bus; when OE is low, selected inputs propagate to outputs with guaranteed VOH ≥ 2.4 V (IOH = −2.6 mA) and VOL ≤ 0.4 V (IOL = 24 mA). Propagation delays are fully characterized over the full military temperature range, with tPZH/tPZL ≤ 20 ns for output enable/disable transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation under regulated 5 V supply with ±10% tolerance, compatible with MIL-STD-704 aircraft power buses. |
| Operating Temp | −55°C to 125°C - qualified for extended-life deployment in airborne, spaceborne, and ground vehicle electronics without derating. |
| tPLH / tPHL (A/B → Y) | 2 ns (min) / 12 ns (max) - enables sub-10 MHz bus switching in real-time control subsystems with deterministic timing margins. |
| IOL / IOH | 24 mA / −2.6 mA - drives standard TTL loads directly; supports fan-out of ≥10 LS-TTL gates without buffers. |
| 3-State Leakage | ±20 µA (IOZL/IOZH) - minimizes bus leakage current during high-impedance state, critical for low-power standby modes in mission-critical systems. |
| Package | LCCC-20 (FK), 8.89 mm × 8.89 mm, 1.27 mm pitch - hermetically sealed ceramic package with superior thermal conductivity and moisture resistance for harsh environments. |
Pinout & Package
LCCC-20 (FK) ceramic package: 8.89 mm × 8.89 mm body, 1.27 mm lead pitch, no leads - solderable metallized terminations on underside perimeter. Hermetic seal meets MIL-PRF-38535 requirements for reliability class QML-38535.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 | Data I/O or Control | Includes 1A–4A, 1B–4B (data inputs), A/B (select), OE (output enable), 1Y–4Y (3-state outputs); precise assignment per top-view diagram in SDAS124C Rev. AUG 1996. |
| 9 | GND | Ground reference for all logic and power domains; must be connected to system chassis ground plane for EMI control. |
| 20 | VCC | +5 V power supply; requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of terminal. |
| NC (Pin 9 not used in FK variant) | No internal connection | Pin 9 is unconnected in LCCC-20 package - confirmed by TI package drawing FK and SDAS124C pinout table for FK. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 4-bit 2:1 multiplexing | Routes two independent 4-bit data words (A and B) to shared 4-bit bus using single A/B select line - reduces PCB trace count and simplifies address/data path arbitration. |
| True 3-state outputs | Outputs present high-impedance state (Z) when OE = HIGH - eliminates bus contention in multi-source systems without external tri-state buffers. |
| MIL-STD-883 Class B screening | Qualified per SN54ALS257A spec - includes temperature cycling, steady-state life test, and bond strength validation for flight-critical applications. |
| ALS TTL compatibility | Meets VIH ≥ 2.0 V, VIL ≤ 0.8 V, and VOH/VOL specs matching LS-TTL and standard TTL - enables drop-in replacement in legacy military digital systems. |
| LCCC-20 hermetic packaging | Zero moisture ingress, <1 ppm He leak rate, and −65°C to +150°C storage rating - ensures long-term reliability in vacuum, high-humidity, or salt-fog environments. |
Applications
| Avionics Data Bus Arbitration | Tactical Radio Baseband Switching |
|---|---|
Use Scenario: Selecting between primary and backup sensor data streams in a fly-by-wire flight control computer. IC Role / Device Role / Timing Role: Dual 4-bit multiplexer providing deterministic, low-latency (<12 ns) selection of inertial measurement unit (IMU) or GPS-derived navigation data onto shared ARINC 429-compatible bus. Use Value: Enables fail-operational redundancy without software intervention; 3-state outputs prevent bus contention during fault detection and switchover. |
Use Scenario: Routing modulated IF signals between two independent transceiver chains in a software-defined radio (SDR) front-end. IC Role / Device Role / Timing Role: Signal path selector isolating analog baseband paths during frequency hopping or channel reconfiguration sequences. Use Value: Eliminates need for RF switches or relays; TTL-level control allows direct FPGA GPIO interfacing with nanosecond-scale settling. |
| Secure Crypto Module Key Path Switching | Missile Guidance System Test Interface |
Use Scenario: Isolating cryptographic key material between secure processing core and external debug/test ports in a Type 1 encryption module. IC Role / Device Role / Timing Role: Tamper-responsive data gate - OE driven by hardware security monitor to force outputs into high-Z upon intrusion detection. Use Value: Prevents side-channel leakage via bus coupling; military temp range ensures operation during thermal shock testing. |
Use Scenario: Connecting ground-test equipment to multiple guidance subsystems (INS, seeker, actuator) through a single diagnostic port. IC Role / Device Role / Timing Role: Reconfigurable signal router enabling sequential access to 4 independent 4-bit telemetry channels without manual patching. Use Value: Reduces test setup time by >70%; LCCC package withstands repeated thermal cycling during environmental stress screening (ESS). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit dual 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ALS257AFK | Identical die, same LCCC-20 package, identical marking (85097012A), and identical QML-38535 qualification level. | No functional or application difference - alternate orderable part number referencing same device. | Select SNJ54ALS257AFK only if procurement system requires explicit manufacturer prefix; both share identical traceability and lot history. |
| 5962-8862601EA | Same SN54ALS257A functionality but in 16-pin CDIP (J) package; lacks pins for NC terminals present in FK layout. | Requires PCB redesign due to different footprint, pin count, and thermal profile; unsuitable for space-constrained LCCC layouts. | Choose only when legacy CDIP socket infrastructure exists and thermal/power constraints allow higher junction temperatures. |
Compared with SNJ54ALS257AFK (identical device) and 5962-8862601EA (CDIP variant), 85097012A offers optimal fit for new LCCC-based designs requiring hermetic sealing, minimal board area, and MIL-STD-883 Class B reliability - with no trade-offs in speed, drive strength, or logic behavior.
Availability
85097012A is available at Aetrix Electronics and suitable for avionics data bus arbitration, tactical radio baseband switching, secure crypto module key path switching, and missile guidance system test interface applications requiring stable component supply across extended product lifecycles.
Supply support for 85097012A 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 components for aerospace, defense, and industrial markets.
The 85097012A belongs to TI's SN54ALS military logic family, engineered for deterministic timing, radiation-tolerant operation, and long-term stability in mission-critical systems where failure is not an option.
FAQ
What is the exact function of the 85097012A?
The 85097012A is a dual 4-bit 2-line-to-1 data selector/multiplexer with 3-state outputs, implementing two independent 2:1 muxes per bit (A/B selection) and a common output-enable (OE) control. It routes either the A or B 4-bit input word to four 3-state outputs (1Y–4Y), as defined in the SN54ALS257A specification. The 85097012A performs this function with full military temperature range support and LCCC packaging.
Is the 85097012A pin-compatible with commercial SN74ALS257A variants?
No - the 85097012A uses a 20-pin LCCC (FK) package, while commercial SN74ALS257A parts use 16-pin D, N, or NS packages. Pin count, layout, and terminal configuration differ fundamentally. Direct PCB replacement is not possible; redesign is required to accommodate the LCCC-20 footprint, GND/VCC placement, and NC pin locations specific to the 85097012A.
Does the 85097012A support hot-swap or live-insertion?
The 85097012A does not include built-in hot-swap protection circuitry. While its 3-state outputs minimize bus contention during power-up, the device lacks controlled slew-rate outputs, undervoltage lockout, or bus-fault tolerance. For live-insertion applications, external current-limiting resistors and sequencing controllers must be implemented - as confirmed by absence of hot-swap features in SDAS124C and TI's SN54ALS257A documentation.
What is the maximum clock/data rate supported by the 85097012A?
The 85097012A does not operate on a clock; it is combinatorial logic. Its maximum usable data rate is determined by propagation delay: tPHL/tPLH ≤ 12 ns (A/B → Y) and tPZL/tPHZ ≤ 12 ns (OE → Y). This supports reliable operation up to ~40 MHz toggle rate in synchronous bus systems, assuming setup/hold margins and PCB trace delays are accounted for - values confirmed in SDAS124C switching characteristics tables for SN54ALS257A.
Can the 85097012A be used in place of SN54ALS258A?
No - the 85097012A corresponds exclusively to SN54ALS257A (dual 2:1 mux), not SN54ALS258A (quad 2:1 mux with individual OE per channel). Functional differences include number of independent select controls (one A/B vs. four), output-enable architecture (common OE vs. per-output OE), and internal logic structure. Substitution would require redesign of control logic and signal routing - confirmed by distinct function tables and logic diagrams in SDAS124C.
85097012A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54ALS
- Package/Case:
- 20-CLCC
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Data Selector/Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 1mA, 12mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LCCC (8.89x8.89)
85097012A FAQ
1.How can I place an order for 85097012A through Aetrix?
Please submit a Request for Quotation (RFQ) for 85097012A 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 85097012A reliable?
The price and inventory of 85097012A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 85097012A is usually 5 days.
3.What payment methods are accepted for 85097012A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 85097012A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 85097012A?
85097012A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 85097012A 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 85097012A?
For technical support, including 85097012A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 85097012A requirements.
6.How does Aetrix verify that 85097012A is sourced from the original manufacturer or authorized distributors?
All 85097012A 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 85097012A meets industry standards.
7.What is the process for return or replacement of 85097012A?
All 85097012A units undergo pre-shipment inspection (PSI). If there is an issue with 85097012A, 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 85097012A part is unused and in its original packaging.
Return procedure for 85097012A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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