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Texas Instruments SN54S244J
- Part No.:
- SN54S244J
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
SN54S244J.pdf
- Description:
- 54S244 OCTAL BUFFERS AND LINE DR
- Quantity:
- Payment:
- Shipping:
Inventory:1,508
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Product details
Overview
SN54S244J from Texas Instruments is a military-grade octal non-inverting 3-state buffer/line driver in a 20-pin CDIP (J) package, designed for high-reliability bus interface applications. It features 48 mA low-level output drive, 15 ns maximum propagation delay at 5 V, and PNP inputs with hysteresis for noise immunity - used in memory address buffering, clock distribution, and terminated line driving down to 133 Ω in telecom infrastructure and motor control systems.
For engineers reviewing the SN54S244J datasheet, SN54S244J pinout, SN54S244J application, or SN54S244J equivalent, key selection criteria include its −55°C to +125°C operating range, 4.5–5.5 V supply tolerance, 3-state enable timing (tPZH/tPZL), input hysteresis (0.2–0.4 V), and compatibility with 3.3-V logic inputs in mixed-voltage systems.
Technical Context
The SN54S244J implements two independent 4-bit non-inverting buffer sections, each with active-low output-enable (1G, 2G/2G) controlling high-impedance state entry/exit. Its Schottky transistor logic (S-TTL) architecture delivers fast switching (tPLH/tPHL ≤9 ns typical) into 50 pF loads with 90 Ω termination, supporting reliable signal integrity on long PCB traces and backplanes.
Input hysteresis (0.2–0.4 V) and PNP input structure reduce DC loading while improving noise margins against ground bounce and crosstalk. The device operates only with single 5-V supply and requires pull-up resistors on G pins during power-up to ensure defined high-impedance state before logic initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - supports industrial/military voltage tolerances and brown-out resilience |
| Propagation Delay | ≤9 ns (tPLH/tPHL, RL=90 Ω, CL=50 pF) - enables high-speed bus operation up to ~100 MHz edge rates |
| Output Drive | IOL = 48 mA (max), IOH = −12 mA - drives terminated lines down to 133 Ω and fan-outs >20 LS-TTL loads |
| Input Hysteresis | 0.2–0.4 V (VT+ − VT−) - increases noise immunity by rejecting sub-threshold glitches on shared buses |
| Operating Temp | −55°C to +125°C - qualified per MIL-PRF-38535 for aerospace, defense, and harsh-environment use |
| ESD Rating | HBM: 500 V - meets standard handling requirements without special ESD controls |
| Quiescent Current | ICC = 95–147 mA (outputs enabled, high/low) - defines thermal budget in dense logic arrays |
Pinout & Package
SN54S244J is supplied in a 20-pin Ceramic Dual In-line Package (CDIP, J), measuring 24.20 mm × 6.92 mm, with through-hole mounting and hermetic sealing for extended reliability in high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1G / 2G/2G | Active-low output-enable inputs - both must be low to activate respective 4-bit buffer sections |
| 2, 4, 6, 8 | 1A1–1A4 | Non-inverting data inputs for Channel 1 - directly connected to source logic without inversion |
| 11, 13, 15, 17 | 2A1–2A4 | Non-inverting data inputs for Channel 2 - electrically isolated from Channel 1 except via common VCC/GND |
| 12, 14, 16, 18 | 1Y1–1Y4 | Non-inverting 3-state outputs for Channel 1 - enter high-Z when 1G = high |
| 3, 5, 7, 9 | 2Y1–2Y4 | Non-inverting 3-state outputs for Channel 2 - enter high-Z when 2G/2G = high |
| 10 | GND | Signal ground reference - must be low-impedance connection to minimize ground bounce |
| 20 | VCC | +5 V power supply - requires local 0.1 µF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Independent channel-level tri-state control enables bidirectional bus sharing without external direction logic |
| PNP Input Structure | Reduces input DC loading to <1 mA per pin - preserves signal integrity on heavily loaded address/data buses |
| Hysteresis on Inputs | 0.2–0.4 V threshold separation suppresses noise-induced false transitions in noisy industrial environments |
| MIL-PRF-38535 Compliance | Full screening including temperature cycling, burn-in, and parametric testing - required for flight-critical avionics |
| 3.3-V Input Tolerance | Accepts 3.3-V logic levels directly - eliminates level-shifter components in mixed-voltage memory subsystems |
Applications
| Memory Address Buffering | Telecom Line Repeater |
|---|---|
Use Scenario: Driving 20-bit memory address bus across 15 cm PCB trace with multiple LS-TTL loads. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating CPU address outputs from memory module inputs; enables bus contention avoidance during DMA cycles. Use Value: 48 mA IOL ensures full logic swing into 133 Ω terminated lines; 9 ns tPLH maintains setup/hold timing margins at 20 MHz clock rates. | Use Scenario: Restoring degraded TTL signal edges on 1.2 m backplane traces between switch fabric ASICs. IC Role / Device Role / Timing Role: Active repeater regenerating clock and control signals with matched rise/fall times and hysteresis noise rejection. Use Value: PNP inputs minimize loading on upstream drivers; 0.4 V hysteresis rejects coupled noise from adjacent high-speed serdes lanes. |
| Motor Control I/O Expansion | Aerospace Avionics Bus Interface |
Use Scenario: Interfacing microcontroller GPIO to 8-channel opto-isolated motor driver enable lines in servo amplifier rack. IC Role / Device Role / Timing Role: Level-translating buffer converting 3.3-V MCU outputs to robust 5-V TTL-compatible signals with fault-isolation capability. Use Value: Direct 3.3-V input compatibility eliminates discrete level shifters; −55°C to +125°C rating supports operation inside sealed motor enclosures. | Use Scenario: Isolating flight computer ARINC-429 transceiver control lines from mission computer I/O backplane. IC Role / Device Role / Timing Role: Radiation-tolerant bus driver providing controlled enable/disable sequencing and EMI-suppressed signal integrity. Use Value: Hermetic CDIP package and MIL-PRF-38535 qualification ensure reliability under ionizing radiation and thermal shock conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN54LS244J | Lower drive (IOL = 12 mA), slower speed (tPLH ≤18 ns), higher noise margin (hysteresis 0.4 V) | Better suited for low-power, noise-sensitive analog-adjacent logic; not rated for high-current bus driving | Select when power dissipation <30 mA/channel is critical and bus trace lengths are <5 cm |
| SN74S244N | Commercial temperature range (0°C to 70°C), same electrical specs, PDIP package (N) | Lacks MIL-PRF-38535 screening; unsuitable for aerospace/defense deployments requiring lot traceability | Select for cost-sensitive industrial control panels where extended temperature and reliability certification are unnecessary |
Compared with SN54LS244J and SN74S244N, SN54S244J uniquely balances military-grade reliability, high-current drive, and fast propagation - making it the only choice for space-constrained, high-noise, wide-temperature bus interfaces requiring guaranteed 48 mA sink capability and hermetic packaging.
Availability
SN54S244J is available at Aetrix Electronics and suitable for memory address buffering, telecom line repeaters, motor control I/O expansion, and aerospace avionics bus interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN54S244J 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 military-grade component heritage.
The SN54S244J belongs to TI's legacy S-TTL logic family, engineered specifically for high-speed, high-drive bus interfacing in mission-critical systems where reliability, timing precision, and environmental resilience are non-negotiable.
FAQ
What is the maximum operating temperature for SN54S244J?
The SN54S244J is rated for operation from −55°C to +125°C ambient temperature, fully compliant with MIL-PRF-38535 Class B requirements. This specification is verified across all electrical parameters in the datasheet's Recommended Operating Conditions table and applies to the CDIP (J) package variant specifically.
Does SN54S244J support 3.3-V logic inputs?
Yes, SN54S244J accepts 3.3-V logic inputs directly - its input structure tolerates voltages down to 2 V and is explicitly characterized for compatibility with 3.3-V and 2.5-V logic families. This eliminates need for external level shifters in mixed-voltage systems, as confirmed in the Features section of the SDLS144D datasheet.
What is the output drive capability of SN54S244J?
SN54S244J provides 48 mA low-level output current (IOL) and −12 mA high-level output current (IOH) under recommended operating conditions. These values are specified in Section 6.3 (Recommended Operating Conditions) and validated in Section 6.6 (Electrical Characteristics – SNx4S24x) of the official TI datasheet.
Is SN54S244J pin-compatible with SN54LS244J?
Yes, SN54S244J and SN54LS244J share identical pin configuration, function mapping, and 20-pin CDIP (J) package dimensions. However, they differ electrically: SN54S244J offers higher drive (48 mA vs. 12 mA) and faster speed (9 ns vs. 18 ns tPLH), so direct substitution requires validation of load and timing margins.
What is the purpose of the hysteresis on SN54S244J inputs?
The input hysteresis (0.2–0.4 V) on SN54S244J improves noise immunity by creating distinct high-to-low and low-to-high switching thresholds. This prevents false triggering from slow-rising signals or coupled noise on shared buses - a documented feature in Section 8.3.3 and Table 6.5/6.6 of the SDLS144D datasheet.
SN54S244J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54S
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- Schmitt Trigger
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
SN54S244J FAQ
1.How can I place an order for SN54S244J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54S244J 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 SN54S244J reliable?
The price and inventory of SN54S244J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54S244J is usually 5 days.
3.What payment methods are accepted for SN54S244J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54S244J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54S244J?
SN54S244J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54S244J 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 SN54S244J?
For technical support, including SN54S244J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54S244J requirements.
6.How does Aetrix verify that SN54S244J is sourced from the original manufacturer or authorized distributors?
All SN54S244J 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 SN54S244J meets industry standards.
7.What is the process for return or replacement of SN54S244J?
All SN54S244J units undergo pre-shipment inspection (PSI). If there is an issue with SN54S244J, 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 SN54S244J part is unused and in its original packaging.
Return procedure for SN54S244J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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