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Texas Instruments SNJ54BCT374J
- Part No.:
- SNJ54BCT374J
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SNJ54BCT374J.pdf
- Description:
- 54BCT374 OCTAL EDGE-TRIGGERED D-
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Inventory:199
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Product details
Overview
SNJ54BCT374J from Texas Instruments is a military-grade octal edge-triggered D-type latch with 3-state outputs, operating across –55°C to 125°C at 4.5 V–5.5 V supply. It features eight independent D-inputs, shared rising-edge CLK and active-low OE, and drives bus lines or memory address registers with ±48 mA output current per channel. Used in hardened I/O port buffering and bus arbitration in avionics and defense computing systems.
For engineers reviewing the SNJ54BCT374J datasheet, SNJ54BCT374J pinout, SNJ54BCT374J application, or SNJ54BCT374J equivalent, key selection criteria include its CDIP-20 package, –55°C to 125°C temperature rating, 70 MHz max clock frequency, BiCMOS low-ICCZ design, and 3-state output drive capability for high-capacitance bus loading.
Technical Context
The SNJ54BCT374J implements eight synchronous D-type latches sharing one clock input (CLK) and one output-enable (OE) control line. Each latch captures data on the rising edge of CLK and holds it until the next clock transition, while OE independently places all eight Q outputs into high-impedance state without affecting internal storage.
Its BiCMOS architecture combines bipolar output drivers for high-current sourcing/sinking (±48 mA) with CMOS-compatible inputs, enabling TTL-level interfacing while reducing quiescent supply current (ICCZ ≤ 8 mA) versus legacy TTL. Input thresholds are VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5 V–5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V logic systems and margin against rail droop in harsh environments |
| Operating Temperature | –55°C to 125°C - qualified for military/aerospace applications requiring extended thermal range |
| Max Clock Frequency | 70 MHz - supports high-speed data latching in real-time control and digital signal routing |
| Output Drive | ±48 mA per channel - sufficient to drive 50 pF bus loads directly without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 11.6 ns - enables tight timing budgets in synchronous bus interfaces |
| Input Clamp Current | –18 mA - protects inputs from transient overvoltage up to –1.2 V below GND |
| 3-State Enable Time | tPZH/tPLZ ≤ 7.5 ns - allows rapid bus release for time-multiplexed peripheral access |
Pinout & Package
SNJ54BCT374J is housed in a 20-pin Ceramic Dual In-line Package (CDIP) with 26.92 mm × 6.92 mm body size and through-hole mounting. The package provides hermetic sealing and thermal stability for high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Disables all eight Q outputs simultaneously into high-impedance state; does not affect internal latch state |
| 2–9, 12–19 (1Q–8Q, 1D–8D) | Data input / latch output | Eight independent D/Q pairs; each Q reflects corresponding D value captured on prior CLK↑ |
| 10 (GND) | Ground reference | Primary return path for all output sink current and internal logic; must be low-impedance |
| 11 (CLK) | Rising-edge clock | Triggers simultaneous capture of all eight D inputs on positive transition; no internal synchronization delay |
| 20 (VCC) | Positive supply | Power source for both logic core and bipolar output drivers; requires local 0.1 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS output stage | Reduces ICCZ to ≤ 8 mA vs. >20 mA in standard TTL, lowering system power and thermal load |
| Buffered control inputs | OE and CLK inputs have internal Schmitt-trigger-like noise immunity and drive strength for reliable operation in noisy environments |
| Full parallel access | All eight D inputs can be loaded simultaneously, enabling single-cycle register file updates in microcoded controllers |
| 3-state bus driving | Outputs drive bus lines directly without pull-ups or interface logic, simplifying PCB layout and reducing component count |
| Military temperature qualification | Tested and guaranteed over –55°C to 125°C, meeting MIL-PRF-38535 requirements for Class B devices |
Applications
| Buffer Registers | I/O Ports |
|---|---|
Use Scenario: Isolating CPU data bus from peripheral address/data latches in radiation-hardened flight computers. IC Role / Device Role / Timing Role: SNJ54BCT374J acts as an octal transparent latch, capturing and holding 8-bit status or command words synchronized to system clock edges. Use Value: Enables deterministic read/write timing with 70 MHz clock support and sub-12 ns propagation delay, critical for real-time avionics response. | Use Scenario: Implementing configurable bidirectional I/O ports in ruggedized ground-vehicle control modules. IC Role / Device Role / Timing Role: SNJ54BCT374J serves as an 8-bit direction-controlled buffer, where OE manages bus ownership and CLK samples input data on rising edge. Use Value: ±48 mA drive strength allows direct connection to industrial sensors/actuators without level-shifting or amplification stages. |
| Bus Drivers | Working Registers |
Use Scenario: Arbitrating shared memory address bus among multiple DSPs in electronic warfare subsystems. IC Role / Device Role / Timing Role: SNJ54BCT374J functions as a high-impedance bus driver, enabling time-multiplexed access via coordinated OE control across multiple devices. Use Value: Fast 7.5 ns enable/disable times minimize bus turnaround latency, improving aggregate throughput in multi-processor architectures. | Use Scenario: Storing intermediate computation results in missile guidance FPGA co-processors during inertial navigation cycles. IC Role / Device Role / Timing Role: SNJ54BCT374J operates as a working register bank, retaining 8-bit intermediate values between pipeline stages under asynchronous reset conditions. Use Value: Hermetic CDIP packaging and –55°C to 125°C operation ensure data retention integrity during extreme thermal cycling in launch environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT374N | Commercial-grade PDIP-20; rated 0°C to 70°C only; identical electrical specs except lower ICCZ (≤ 5 mA) | Limited to non-military industrial control; lacks extended temperature validation and hermetic seal | Select when cost sensitivity outweighs environmental robustness and full MIL-PRF-38535 compliance is unnecessary |
| SNJ54ACT374J | Advanced CMOS variant; same CDIP-20 package but higher VIH (≥ 3.5 V), lower VOL (≤ 0.36 V), and 100 MHz fmax | Better noise immunity and speed, but incompatible with legacy 2.0 V VIH TTL systems; higher static power at 5 V | Choose for new designs requiring faster timing or stricter noise margins, provided system logic levels align |
Compared with SN74BCT374N and SNJ54ACT374J, the SNJ54BCT374J uniquely balances military temperature range, proven BiCMOS drive strength, and backward compatibility with legacy 5 V TTL buses-making it irreplaceable in fielded avionics upgrades where reliability and drop-in fit are mandatory.
Availability
SNJ54BCT374J is available at Aetrix Electronics and suitable for avionics subsystems, defense electronics manufacturing, and space-qualified instrumentation requiring stable component supply across extended lifecycle demands.
Supply support for SNJ54BCT374J 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 logic solutions, with over 90 years of innovation in high-reliability components.
The SNJ54BCT374J belongs to TI's military logic family designed for aerospace, defense, and industrial systems demanding extended temperature operation, hermetic packaging, and long-term supply assurance.
FAQ
What is the maximum clock frequency supported by the SNJ54BCT374J?
The SNJ54BCT374J supports a maximum clock frequency of 70 MHz across its full operating temperature range of –55°C to 125°C. This specification is verified under recommended conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF) and applies specifically to the SNJ54BCT374J variant, not commercial SN74BCT374 derivatives. Timing margins remain valid even at temperature extremes due to military-grade characterization.
Does the SNJ54BCT374J require external pull-up resistors on its 3-state outputs?
No, the SNJ54BCT374J does not require external pull-up resistors on its 3-state outputs. Its bipolar push-pull outputs actively drive high or low states and enter true high-impedance (Z) when OE is high-eliminating bus contention and enabling direct connection to capacitive bus loads up to 50 pF. Pull-ups would interfere with the specified VOL ≤ 0.55 V and VOH ≥ 2.4 V performance.
Can unused inputs on the SNJ54BCT374J be left floating?
No, unused inputs on the SNJ54BCT374J must not be left floating. All unused D, CLK, and OE inputs must be tied to either VCC or GND to prevent undefined logic states, excessive power consumption, or oscillation. TI explicitly mandates this in Section 6.3 and Figure 11-1 of the SNJ54BCT374J datasheet. Floating CMOS inputs violate absolute maximum ratings and risk device malfunction in mission-critical systems.
What is the purpose of the ICCZ parameter for the SNJ54BCT374J?
The ICCZ parameter for the SNJ54BCT374J specifies the supply current drawn when all outputs are in high-impedance state (OE = high) and inputs are static. At VCC = 5.5 V and TA = 25°C, ICCZ is ≤ 8 mA-significantly lower than legacy TTL equivalents. This low quiescent current reduces thermal load and improves power efficiency in standby or bus-arbitrated modes, a key advantage of its BiCMOS design.
How does the SNJ54BCT374J differ from the SN74BCT374N in terms of packaging and reliability?
The SNJ54BCT374J uses a hermetically sealed Ceramic Dual In-line Package (CDIP-20) qualified to MIL-PRF-38535 Class B, supporting –55°C to 125°C operation and long-term reliability in vacuum or high-humidity environments. In contrast, the SN74BCT374N uses plastic PDIP-20, rated only from 0°C to 70°C, with no moisture resistance or radiation tolerance. Both share identical logic functionality, but SNJ54BCT374J's packaging enables deployment in flight-critical systems where SN74BCT374N cannot be used.
SNJ54BCT374J 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SNJ54BCT374J FAQ
1.How can I place an order for SNJ54BCT374J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54BCT374J on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SNJ54BCT374J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54BCT374J is usually 5 days.
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Once your SNJ54BCT374J 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 SNJ54BCT374J?
For technical support, including SNJ54BCT374J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54BCT374J requirements.
6.How does Aetrix verify that SNJ54BCT374J is sourced from the original manufacturer or authorized distributors?
All SNJ54BCT374J 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 SNJ54BCT374J meets industry standards.
7.What is the process for return or replacement of SNJ54BCT374J?
All SNJ54BCT374J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54BCT374J, 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 SNJ54BCT374J part is unused and in its original packaging.
Return procedure for SNJ54BCT374J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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