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Texas Instruments SNJ54BCT374FK
- Part No.:
- SNJ54BCT374FK
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SNJ54BCT374FK.pdf
- Description:
- 54BCT374 OCTAL EDGE-TRIGGERED D-
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Inventory:258
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Product details
Overview
SNJ54BCT374FK from Texas Instruments is a military-grade octal edge-triggered D-type latch with 3-state outputs, operating at 4.5 V–5.5 V supply, featuring rising-edge clock triggering, active-low output enable, and bipolar push-pull drive capable of sourcing 96 mA (low state) and sinking 50 mA (high-impedance off-state). It serves as a bus interface register in high-reliability aerospace and defense digital systems.
For engineers reviewing the SNJ54BCT374FK datasheet, SNJ54BCT374FK pinout, SNJ54BCT374FK application, or SNJ54BCT374FK equivalent, key selection considerations include its –55°C to +125°C operating range, LCCC-20 hermetic package, BiCMOS low-ICCZ quiescent current (5–8 mA), and guaranteed 70 MHz maximum clock frequency under military temperature conditions.
Technical Context
This device implements eight independent D-type latches sharing one rising-edge-sensitive CLK and one active-low OE control signal. Its BiCMOS architecture combines CMOS input stages with bipolar output transistors, enabling TTL-compatible logic levels while reducing ICCZ versus standard TTL.
The latch operates in three functional modes: transparent data capture on CLK↑ (OE = L), hold mode (OE = L, CLK stable), and high-impedance tri-state output (OE = H). Output drive strength (VOL = 0.38–0.55 V at IOL = 48–64 mA) and fast switching (tPLH/tPHL ≤ 11.6 ns) support direct bus driving without external pull-ups or buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL/CMOS systems and margin for voltage droop in ruggedized power rails |
| Operating Temperature | –55°C to +125°C - qualified for extended-range military and aerospace applications per SN54BCT374 specification |
| Max Clock Frequency | 70 MHz - supports high-speed data latching in real-time avionics and radar timing subsystems |
| Output Drive (IOL) | 96 mA - enables direct drive of heavy capacitive loads (≤50 pF) or multiple TTL inputs without buffering |
| Quiescent Current (ICCZ) | 5–8 mA - BiCMOS design reduces standby power vs. legacy TTL, critical for thermally constrained platforms |
| Propagation Delay | tPLH/tPHL ≤ 11.6 ns - guarantees deterministic timing margins in synchronous bus arbitration logic |
| Input Clamp Current | –18 mA - protects against transient overvoltage events common in harsh EMI environments |
Pinout & Package
LCCC-20 (Leadless Ceramic Chip Carrier) package: 8.89 mm × 8.89 mm ceramic body with solderable metallized perimeter terminals; hermetically sealed for moisture resistance and long-term reliability in space and defense applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Tri-states all eight Q outputs simultaneously; does not affect internal latch state - enables shared bus arbitration |
| 2–9, 12–19 (1Q–8Q, 1D–8D) | Output / Data input | Eight independent D/Q channels; each D input samples on CLK↑; Q outputs reflect latched value or high-Z when OE = H |
| 10 (GND) | Ground reference | Primary return path for output sink current and internal logic; requires low-inductance connection to minimize ground bounce |
| 11 (CLK) | Rising-edge clock | Edge-triggered sampling node; data setup/hold times (tsu = 6.5 ns, th = 0 ns) define minimum pulse width and timing window |
| 20 (VCC) | Positive supply | 5 V nominal power rail; requires local 0.1 µF bypass capacitor adjacent to pin to suppress high-frequency switching noise |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ to 5–8 mA - cuts standby power by >50% vs. equivalent TTL latches, easing thermal management in sealed enclosures |
| 3-state outputs with buffered OE | Enables bidirectional bus sharing across multiple SNJ54BCT374FK devices without external bus transceivers or direction control logic |
| Bipolar push-pull output stage | Delivers 96 mA sink current - drives up to 10 standard TTL loads directly, eliminating need for discrete buffer stages in I/O port designs |
| CMOS-compatible inputs | Supports VIH ≥ 2 V and VIL ≤ 0.8 V - interoperates with both 5 V CMOS and TTL logic families without level-shifting circuitry |
| Hermetic LCCC-20 packaging | Provides MIL-STD-883 Class B qualification - ensures long-term reliability in vacuum, high-humidity, and radiation-prone environments |
Applications
| Aerospace Data Acquisition | Military Bus Interface |
|---|---|
Use Scenario: Capturing synchronized sensor data streams (e.g., inertial measurement unit outputs) before transmission over MIL-STD-1553B or ARINC 429 buses. IC Role / Device Role / Timing Role: Octal latch holds parallel analog-to-digital converter outputs stable during serialization; CLK synchronized to system master clock. Use Value: Eliminates metastability risk via edge-triggered capture and provides bus isolation via 3-state OE during data packet framing. |
Use Scenario: Interfacing processor address/data buses to legacy peripheral modules in tactical vehicle command-and-control systems. IC Role / Device Role / Timing Role: Acts as bi-directional address latch and data buffer between microcontroller and memory-mapped I/O devices. Use Value: High-current drive (96 mA) and –55°C to +125°C operation ensure robust bus signaling across extreme ambient conditions. |
| Avionics Display Control | Radar Signal Processing |
Use Scenario: Holding pixel row/column address data for CRT or LED display drivers in cockpit multifunction displays. IC Role / Device Role / Timing Role: Working register storing display refresh addresses; updated synchronously with vertical blanking interval clock. Use Value: Low propagation delay (≤11.6 ns) and precise setup/hold timing guarantee glitch-free address transitions during high-refresh-rate rendering. |
Use Scenario: Buffering intermediate FFT or pulse-Doppler processing results between FPGA accelerator stages and analog front-end DACs. IC Role / Device Role / Timing Role: Synchronizing pipeline stages by latching processed sample vectors at fixed clock intervals. Use Value: Hermetic LCCC package prevents moisture-induced parameter drift, maintaining timing accuracy over 20+ year service life in airborne radar units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ACT374FK | Advanced CMOS (ACT) process; lower ICCZ (2–5 mA), higher speed (tPLH ≤ 8.5 ns), but reduced output drive (24 mA) | Better for low-power, high-speed logic in non-bus-driving roles; unsuitable for direct TTL load driving | Select when power efficiency and speed outweigh drive strength requirements |
| SNJ54LS374J | TTL process; higher ICCZ (30–45 mA), slower (tPLH ≤ 25 ns), same 96 mA output drive, CDIP-20 package | Legacy drop-in replacement where LCCC hermeticity is not required and board space allows larger package | Select only for backward compatibility in existing CDIP-based designs with no thermal or size constraints |
Compared with SNJ54ACT374FK and SNJ54LS374J, SNJ54BCT374FK uniquely balances military-grade temperature range, hermetic reliability, strong bus-driving capability (96 mA), and moderate quiescent power (5–8 mA) - making it the sole choice for new high-integrity bus interface designs requiring all four attributes.
Availability
SNJ54BCT374FK is available at Aetrix Electronics and suitable for aerospace data acquisition, military bus interface, avionics display control, and radar signal processing applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SNJ54BCT374FK 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 50 years of heritage in high-reliability military and space-grade components.
SNJ54BCT374FK belongs to TI's SN54BCT family of BiCMOS octal latches, designed specifically for high-drive, low-power, extended-temperature digital interfacing in defense electronics, avionics, and satellite subsystems.
FAQ
What is the maximum clock frequency supported by SNJ54BCT374FK across its full temperature range?
The SNJ54BCT374FK supports a guaranteed maximum clock frequency of 70 MHz over its full operating range of –55°C to +125°C, as specified in Section 6.6 of the official TI datasheet (SCBS019D). This rating applies to the SN54BCT374 variant and is validated under recommended supply (4.5 V–5.5 V) and load (CL = 50 pF) conditions.
Does SNJ54BCT374FK require external pull-up resistors on its 3-state outputs?
No, SNJ54BCT374FK does not require external pull-up resistors on its 3-state outputs. Its bipolar push-pull outputs actively drive both logic high and low states when enabled (OE = L); the high-impedance state (OE = H) presents minimal leakage (±50 μA), eliminating bus contention without passive termination.
Can unused input pins on SNJ54BCT374FK be left floating?
No, unused input pins on SNJ54BCT374FK must not be left floating. Per TI's design guidelines (Section 8.3.2 and Layout Example Fig 11-1), all unused CMOS inputs must be tied to VCC or GND to prevent oscillation, excessive power consumption, and undefined logic states - especially critical in high-noise military environments.
What is the absolute maximum output current rating for SNJ54BCT374FK?
The absolute maximum output current for SNJ54BCT374FK is ±225 mA (IOS), as stated in Section 6.5 of the datasheet. However, the recommended operating condition limits continuous output current to 96 mA (IOL) in the low state and –50 mA (IOH) in the high state to maintain electrical integrity and thermal safety within the LCCC-20 package.
Is SNJ54BCT374FK compatible with 3.3 V logic interfaces?
SNJ54BCT374FK is not 3.3 V logic compatible. It is strictly a 5 V device with VIH(min) = 2.0 V and VIL(max) = 0.8 V, requiring 5 V-tolerant inputs. Direct connection to 3.3 V logic may result in marginal or failed logic-level recognition; level-shifting circuitry is required for interoperability with 3.3 V systems.
SNJ54BCT374FK 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:
- -
SNJ54BCT374FK FAQ
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7.What is the process for return or replacement of SNJ54BCT374FK?
All SNJ54BCT374FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54BCT374FK, 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 SNJ54BCT374FK part is unused and in its original packaging.
Return procedure for SNJ54BCT374FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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