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Texas Instruments SN74ALS653-1NT
- Part No.:
- SN74ALS653-1NT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS653-1NT.pdf
- Description:
- BUS TRANSCEIVER, ALS SERIES
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Product details
Overview
SN74ALS653-1NT from Texas Instruments is an octal bus transceiver and register IC with open-collector A-side outputs, 3-state B-side outputs, and inverting data path. It supports real-time or stored data transfer between two 8-bit buses (A and B), features independent clock and select controls (CLKAB/CLKBA, SAB/SBA), and operates at up to 35 MHz with 5 V supply. It is used in legacy industrial control backplanes requiring bidirectional bus isolation and registered data latching.
For engineers reviewing the SN74ALS653-1NT datasheet, SN74ALS653-1NT pinout, SN74ALS653-1NT application, or SN74ALS653-1NT equivalent, key selection criteria include its open-collector A outputs for wired-AND bus arbitration, true/inverting mode configuration, storage register timing (tsu = 10 ns, th = 0 ns), and NT-package thermal performance (θJA = 67°C/W).
Technical Context
The SN74ALS653-1NT integrates eight D-type flip-flops per bus, dual output-enable (OEAB/OEBA) and dual select-control (SAB/SBA) inputs, and eliminates multiplexer decoding glitches during real-time ↔ stored data transitions. Its architecture allows simultaneous A/B bus storage on CLKAB↑/CLKBA↑ edges regardless of OE/S state.
It implements a dual-bus management system where SAB = L selects real-time A→B transfer, SBA = L selects real-time B→A transfer, and high-level select enables stored-data routing. The A-side open-collector outputs require external pull-ups and support wired-AND logic; B-side 3-state outputs drive standard TTL loads directly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Octal bus transceiver + dual 8-bit register with independent A/B control |
| A-side Output Type | Open-collector - enables wired-AND bus sharing and level translation via external pull-up |
| B-side Output Type | 3-state - supports high-impedance bus isolation without external components |
| Data Path | Inverting - A↔B data transfer complements input values; critical for parity or logic inversion schemes |
| Max Clock Frequency | 35 MHz - determines maximum real-time throughput in synchronous bus systems |
| Setup/Hold Time | tsu = 10 ns, th = 0 ns - defines minimum data stability window before/after CLKAB↑ or CLKBA↑ |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/ALS logic rails; not 3.3 V tolerant |
Pinout & Package
SN74ALS653-1NT uses a 24-pin plastic dual in-line package (PDIP-NT), with 0°C to 70°C commercial temperature range. Pinout follows standard TI DW/JT/NT mapping shown in SDAS066G Figure 1 and logic diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | CLKBA, SBA | Bus B clock and select - low SBA enables real-time B→A transfer; CLKBA↑ latches B data into register |
| 3, 23 | OEAB, OEBA | Output enables - OEAB = L enables A outputs; OEBA = L enables B outputs; both H disables all outputs |
| 4–11 | A1–A8 | A-bus I/O terminals - open-collector outputs; inputs always enabled for storage |
| 13–20 | B1–B8 | B-bus I/O terminals - 3-state outputs; inputs always enabled for storage |
| 12, 24 | GND, VCC | Power pins - requires local 0.1 µF ceramic decoupling at VCC pin |
| 21, 22 | SAB, CLKAB | Bus A select and clock - low SAB enables real-time A→B transfer; CLKAB↑ latches A data |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free select control | Eliminates transient bus contention during SAB/SBA transitions - ensures deterministic real-time ↔ stored mode switching |
| Dual independent registers | Allows concurrent storage of A and B bus data - enables ping-pong buffering without external latch logic |
| Wired-AND capable A outputs | Open-collector A-side supports shared interrupt lines or priority encoding via external pull-up resistor networks |
| Real-time reinforcement mode | When OEAB = OEBA = L and SAB = SBA = L, outputs reinforce inputs - maintains bus state with no internal register load |
| Input-enabled storage | Data latched on every CLKAB↑/CLKBA↑ edge regardless of OE/S state - guarantees capture even during output disable |
Applications
| Industrial Backplane Bus Arbitration | Legacy Computer Memory Expansion |
|---|---|
Use Scenario: Multiple CPU cards share a common 8-bit data bus in a rack-mounted PLC chassis, requiring priority-based interrupt signaling. IC Role / Device Role / Timing Role: SN74ALS653-1NT provides open-collector A outputs for wired-AND interrupt aggregation and registered B-side interface to local card memory. Use Value: Enables hardware-prioritized interrupt resolution without software polling; registered path ensures setup/hold compliance with asynchronous CPU bus cycles. | Use Scenario: ISA-compatible expansion card adds RAM to 1980s-era PC, requiring bidirectional data flow between CPU and SRAM with address/data separation. IC Role / Device Role / Timing Role: SN74ALS653-1NT acts as registered transceiver between CPU AD[7:0] and SRAM D[7:0], with SAB/SBA selecting between direct or latched access. Use Value: Eliminates need for discrete 74LS373 latches; inverting path matches SRAM read/write polarity requirements in some designs. |
| Test Equipment Digital Pattern Generator | Avionics Data Bus Interface Module |
Use Scenario: Automated test system generates synchronized 8-bit stimulus patterns while capturing response data from DUT under varying timing constraints. IC Role / Device Role / Timing Role: SN74ALS653-1NT buffers and registers pattern data between FPGA controller and DUT connector, using CLKAB/CLKBA for precise edge-aligned sampling. Use Value: Provides deterministic 10 ns setup margin and zero hold time - simplifies timing closure for variable-speed test vectors. | Use Scenario: Retrofit module interfaces MIL-STD-1553B remote terminal data to legacy parallel avionics subsystems operating at 5 V. IC Role / Device Role / Timing Role: SN74ALS653-1NT isolates and registers command/status words between serial protocol engine and parallel bus, with OEAB/OEBA enabling hot-swap-safe bus disconnection. Use Value: Open-collector A outputs tolerate voltage mismatches; 3-state B outputs prevent bus contention during power-up sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS652A-NT | True (non-inverting) data path; 3-state outputs on both A and B sides; higher max clock (40 MHz) | Lacks open-collector capability; unsuitable for wired-AND bus sharing or level translation | Select when bidirectional non-inverting transfer and maximum speed are required, and bus arbitration is handled externally |
| SN74ALS654-NT | True data path; open-collector A outputs; 3-state B outputs - same package and pinout as SN74ALS653-1NT | Does not invert data - required where signal polarity must be preserved end-to-end | Drop-in replacement if inverting behavior is undesirable; identical timing, drive strength, and thermal specs |
Compared with SN74ALS652A-NT and SN74ALS654-NT, the SN74ALS653-1NT uniquely combines open-collector A outputs with inverting logic - essential for legacy bus architectures requiring complemented handshake signals or parity generation within the transceiver path.
Availability
SN74ALS653-1NT is available at Aetrix Electronics and suitable for industrial backplane bus arbitration, legacy computer memory expansion, and avionics interface modules requiring stable component supply across long-lifecycle programs.
Supply support for SN74ALS653-1NT 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS653-1NT belongs to TI's legacy ALS (Advanced Low-Power Schottky) logic family, designed for high-speed, low-power 5 V TTL-compatible systems where registered bus control and flexible output topology were critical in 1980s–1990s computing and instrumentation.
FAQ
What is the function of the SAB and SBA pins on the SN74ALS653-1NT?
The SAB and SBA pins on the SN74ALS653-1NT are select-control inputs that determine whether data transfers in real-time or from internal storage registers. When SAB is low, real-time data flows from bus A to bus B; when high, stored A data is transferred. Similarly, SBA low enables real-time B→A transfer, and high enables stored B→A transfer. This dual-select architecture eliminates decoding glitches during mode transitions - a key feature confirmed in the SDAS066G datasheet functional tables for SN74ALS653-1NT.
Does the SN74ALS653-1NT support 3.3 V operation?
No, the SN74ALS653-1NT does not support 3.3 V operation. Its recommended operating supply voltage is strictly 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. Input voltage limits are –0.5 V to 7 V for controls and –0.5 V to 5.5 V for I/O ports. Operating below 4.5 V risks failure to meet guaranteed VOH/VOL and timing specs. This is explicitly defined in the "Recommended Operating Conditions" table for SN74ALS653 on page 12 of SDAS066G.
What is the difference between SN74ALS653-1NT and SN74ALS653NT?
The SN74ALS653-1NT is the "-1" version of SN74ALS653NT, distinguished by an increased recommended maximum IOL of 48 mA (vs. 24 mA for standard SN74ALS653NT), but only when VCC is maintained between 4.75 V and 5.25 V. The -1 suffix applies only to SN74ALS651A and SN74ALS652A per the datasheet footnote; however, SN74ALS653-1NT is a valid orderable part with documented 48 mA drive capability on B-side outputs. Both share identical pinout, timing, and logic functionality.
Can the SN74ALS653-1NT be used as a level translator between 5 V and lower-voltage buses?
The SN74ALS653-1NT can translate down to lower voltages only on its open-collector A-side outputs, provided an external pull-up resistor is connected to the target voltage (e.g., 3.3 V). The A outputs clamp to ~0.5 V when active and float high when disabled, allowing safe interfacing with 3.3 V or 2.5 V receivers. However, B-side 3-state outputs are TTL-compatible and rated only for 5 V logic levels; driving them directly into sub-5 V inputs risks overvoltage damage unless current-limiting or clamping is added.
How does the SN74ALS653-1NT handle simultaneous clocking of both buses?
When SAB = SBA = L (real-time mode), the SN74ALS653-1NT allows simultaneous CLKAB↑ and CLKBA↑ transitions to store data from both A and B buses into their respective registers - confirmed in the Function Tables on page 4 of SDAS066G. In stored-data mode (SAB/SBA = H), clocks must be staggered to avoid metastability; the device requires CLKAB and CLKBA to be offset by ≥10 ns to ensure reliable dual-register loading, as specified in the note under the Function Tables.
SN74ALS653-1NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
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- Supplier Device Package:
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SN74ALS653-1NT FAQ
1.How can I place an order for SN74ALS653-1NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS653-1NT 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 SN74ALS653-1NT reliable?
The price and inventory of SN74ALS653-1NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS653-1NT is usually 5 days.
3.What payment methods are accepted for SN74ALS653-1NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS653-1NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS653-1NT?
SN74ALS653-1NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS653-1NT 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 SN74ALS653-1NT?
For technical support, including SN74ALS653-1NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS653-1NT requirements.
6.How does Aetrix verify that SN74ALS653-1NT is sourced from the original manufacturer or authorized distributors?
All SN74ALS653-1NT 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 SN74ALS653-1NT meets industry standards.
7.What is the process for return or replacement of SN74ALS653-1NT?
All SN74ALS653-1NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS653-1NT, 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 SN74ALS653-1NT part is unused and in its original packaging.
Return procedure for SN74ALS653-1NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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