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Texas Instruments SN74BCT533N
- Part No.:
- SN74BCT533N
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74BCT533N.pdf
- Description:
- BUS DRIVER, BCT/FBT SERIES
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Inventory:920
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Product details
Overview
SN74BCT533N from Texas Instruments is an 8-bit transparent D-type latch with 3-state inverting outputs, designed for driving high-capacitance bus lines and low-impedance memory address registers. It operates at 4.5–5.5 V, delivers ±64 mA output drive, supports 0°C to 70°C ambient, and features BiCMOS architecture for low ICCZ quiescent current.
For engineers reviewing the SN74BCT533N datasheet, SN74BCT533N pinout, SN74BCT533N application, or SN74BCT533N equivalent, key selection criteria include inverted-output latching behavior, OE-controlled high-impedance state, LE-synchronized data capture timing (tSU = 2.5 ns), and PDIP-20 package compatibility with legacy board layouts.
Technical Context
The SN74BCT533N implements a parallel-load transparent latch with independent LE (latch-enable) and OE (output-enable) controls. Its BiCMOS design combines bipolar input stages for speed and CMOS output drivers for high current sinking (64 mA) and sourcing (−15 mA), enabling direct bus driving without pull-ups.
Latching occurs on LE falling edge with 2.5 ns setup and 3 ns hold time; OE asserts high-impedance within 1.3–3.7 ns without affecting internal storage. Output inversion is hardwired-no external logic required-and all eight outputs share identical AC/DC specs per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit transparent D-type latch with inverted 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems |
| Output Drive | 64 mA sink / −15 mA source - drives heavy capacitive buses directly |
| Propagation Delay | 2.7–9.3 ns (D→Q or LE→Q) - supports >100 MHz bus toggle rates |
| Input Capacitance | 6 pF - minimizes loading on upstream drivers |
| Operating Temperature | 0°C to 70°C - commercial-grade operation for non-extended environments |
| ESD Protection | ≥2000 V HBM - exceeds MIL-STD-883C Method 3015 for board handling robustness |
Pinout & Package
SN74BCT533N uses a 20-pin plastic dual in-line package (PDIP), 300-mil width, with standard through-hole mounting and 0.1-inch pin pitch. Pin 1 is top-left corner (notch-up orientation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output-enable control | Active-low signal placing all Q outputs in high-Z; no effect on internal latch state |
| 2–9 (1D–8D) | Data inputs | Asynchronous inputs latched on LE↓; inverted values appear at corresponding Q pins |
| 11 (LE) | Latch-enable control | High enables transparency; falling edge captures D-input states into latch |
| 12–19 (1Q–8Q) | Inverted latched outputs | Active-drive or high-Z outputs - each mirrors complement of its D input when enabled |
| 10 (GND) | Ground reference | Power return path for logic and output stages |
| 20 (VCC) | Positive supply | 5 V nominal supply powering BiCMOS internal circuitry and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ to 5–8 mA while maintaining TTL-compatible speed and drive strength |
| Full parallel data access | Enables simultaneous loading of all 8 bits without serialization or clock gating |
| 3-state inverting outputs | Eliminates need for external inverters or bus termination resistors in bidirectional buffer designs |
| Independent OE and LE controls | Allows data retention during bus contention and dynamic output enable/disable without latch disruption |
| High noise immunity | VIL = 0.8 V / VIH = 2.0 V thresholds ensure robust operation in electrically noisy industrial backplanes |
Applications
| Memory Address Buffering | Bus Interface Isolation |
|---|---|
Use Scenario: Buffering CPU address lines to multiple memory banks with shared data bus. IC Role / Device Role / Timing Role: Latches inverted address bits during memory access cycles; OE isolates inactive banks. Use Value: Prevents address line contention and reduces propagation delay skew across 8-bit address group via matched tPLH/tPHL specs. |
Use Scenario: Isolating microcontroller I/O ports from peripheral expansion buses with hot-swap capability. IC Role / Device Role / Timing Role: Provides direction-controlled 3-state interface between master and slave devices using OE as bus arbitration signal. Use Value: Enables zero-latency bus release (tPLZ = 1.3 ns) and eliminates external tristate logic or level shifters. |
| Bidirectional Data Register | I/O Port Expansion |
Use Scenario: Implementing a bidirectional 8-bit data register between two asynchronous subsystems. IC Role / Device Role / Timing Role: Stores and inverts data on LE↓; OE toggles directionality without altering stored value. Use Value: Supports full-duplex handshaking with guaranteed hold time (th = 3 ns) preventing metastability during direction switches. |
Use Scenario: Expanding GPIO count on legacy 5 V microcontrollers with limited pin availability. IC Role / Device Role / Timing Role: Acts as buffered, invert-enabled I/O port where D inputs serve as read-back lines and Q outputs drive external loads. Use Value: Delivers 64 mA per output - sufficient to drive LEDs, relays, or optocouplers without external drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit inverting latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT533N | AC-family CMOS; higher VIH (3.5 V), lower ICCZ (<1 µA), but reduced drive (−24/+24 mA) | Lower power, less noise margin, unsuitable for heavy bus loading | Select when system prioritizes static power over drive strength and operates with clean 5 V rails |
| 74F533N | F-family TTL; no BiCMOS; higher ICCZ (35 mA), faster tPLH (2.3 ns), same PDIP-20 pinout | Higher power consumption, greater heat generation, incompatible with low-noise EMI-sensitive designs | Select only for legacy F-series board replacements where timing margin is critical and thermal budget allows |
Compared with SN74BCT533N, SN74ACT533N trades drive capability for ultra-low quiescent current, while 74F533N offers marginal speed gain at significantly higher static power - making SN74BCT533N the optimal balance for bus-buffering applications requiring both robust drive and moderate power efficiency.
Availability
SN74BCT533N is available at Aetrix Electronics and suitable for memory address buffering, bus interface isolation, and I/O port expansion requiring stable component supply in commercial-temperature embedded systems.
Supply support for SN74BCT533N 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 SN74BCT533N belongs to TI's BCT (Bipolar-CMOS-Transistor) logic family, engineered to bridge TTL speed and CMOS power efficiency for high-drive 5 V system interfacing.
FAQ
What is the logic function of the SN74BCT533N?
The SN74BCT533N is an 8-bit transparent D-type latch with active-low 3-state outputs that deliver inverted data. When LE is high, Q outputs follow inverted D inputs; when LE goes low, the inverted D values are latched. OE independently places all outputs in high-impedance without affecting stored data. This makes SN74BCT533N ideal for bus-oriented applications requiring inversion and isolation.
Does the SN74BCT533N support 5 V TTL-compatible operation?
Yes, the SN74BCT533N is fully 5 V TTL-compatible: it accepts VIH ≥ 2.0 V and VIL ≤ 0.8 V, sources/sinks up to −15 mA/64 mA, and operates across 4.5–5.5 V. Its BiCMOS design ensures TTL-level noise margins and drive strength while reducing ICCZ versus standard TTL latches - a key feature confirmed in the SCBS055A datasheet for SN74BCT533N.
What is the maximum capacitive load the SN74BCT533N can drive reliably?
The SN74BCT533N is characterized for CL = 50 pF in switching tests, with tPLH/tPHL specified under those conditions. Its 64 mA sink capability supports heavier loads - typical bus capacitance up to 100–150 pF is achievable with controlled edge rates. The device's low output impedance and BiCMOS output stage make SN74BCT533N suitable for driving long traces or multiple TTL inputs without external buffers.
Is the SN74BCT533N pin-compatible with other 74-series latches like the 74LS373?
No, the SN74BCT533N is not pin-compatible with 74LS373. While both are 20-pin DIP latches, SN74BCT533N has inverted outputs and separate LE/OE pins (pin 11 = LE, pin 1 = OE), whereas 74LS373 uses a single G pin (pin 11) for latch enable and has non-inverting outputs. Substituting SN74BCT533N for 74LS373 requires PCB redesign and logic inversion compensation - a distinction clearly documented in the SN74BCT533N function table and pin diagram.
What is the operating temperature range for the SN74BCT533N?
The SN74BCT533N is characterized for operation from 0°C to 70°C - the commercial temperature range. This is explicitly stated in the "recommended operating conditions" table of the SCBS055A datasheet and applies to all electrical and timing specifications. It is not rated for extended industrial (−40°C to 85°C) or automotive temperature ranges, and SN74BCT533N performance outside 0°C–70°C is not guaranteed.
SN74BCT533N 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:
- -
- Supplier Device Package:
- -
SN74BCT533N FAQ
1.How can I place an order for SN74BCT533N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT533N 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 SN74BCT533N reliable?
The price and inventory of SN74BCT533N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT533N is usually 5 days.
3.What payment methods are accepted for SN74BCT533N?
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4.How is shipping managed for SN74BCT533N?
SN74BCT533N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT533N 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 SN74BCT533N?
For technical support, including SN74BCT533N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT533N requirements.
6.How does Aetrix verify that SN74BCT533N is sourced from the original manufacturer or authorized distributors?
All SN74BCT533N 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 SN74BCT533N meets industry standards.
7.What is the process for return or replacement of SN74BCT533N?
All SN74BCT533N units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT533N, 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 SN74BCT533N part is unused and in its original packaging.
Return procedure for SN74BCT533N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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