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NXP Semiconductors MB2245BB,557
- Part No.:
- MB2245BB,557
- Manufacturer:
- NXP Semiconductors
- Package:
- 52-QFP
- Datasheet:
-
MB2245BB,557.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,405
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Product details
Overview
MB2245BB,557 from Philips Semiconductors is a 16-bit bidirectional bus transceiver with independent direction and output-enable controls, designed for high-speed 5V TTL/CMOS system interconnects. It features non-inverting 3-State outputs on both A and B sides, ±64 mA/–32 mA drive capability, and operates across –40°C to +85°C in a 52-pin PQFP package.
For engineers reviewing the MB2245BB,557 datasheet, MB2245BB,557 pinout, MB2245BB,557 application, or MB2245BB,557 equivalent, key selection criteria include propagation delay (≤4.5 ns), dual-direction control logic, power-up 3-State behavior, latch-up immunity (>500 mA), and compatibility with legacy 5V bus architectures requiring bidirectional data flow between microcontrollers and peripheral subsystems.
Technical Context
The MB2245BB,557 implements two independent 8-bit transceiver sections (1A/1B and 2A/2B), each with dedicated active-high direction (1DIR/2DIR) and active-low output-enable (1OE/2OE) inputs. Its BiCMOS process enables simultaneous low static current (65 µA in 3-State) and high-speed switching (tPLH/tPHL ≤ 4.5 ns at VCC = 5.0 V, CL = 50 pF).
Input disable during 3-State mode prevents bus contention; multiple VCC/GND pins reduce ground bounce and supply noise. The device supports hot insertion via power-up 3-State and meets JEDEC Std 17 latch-up protection and MIL-STD-883 ESD thresholds (2000 V HBM, 200 V MM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures robust operation under noisy 5V rail conditions without brownout or overvoltage stress. |
| Propagation Delay | ≤4.5 ns (tPLH/tPHL, VCC = 5.0 V, CL = 50 pF) - Enables reliable timing in 100+ MHz bus systems with margin. |
| Output Drive | +64 mA sink / –32 mA source - Supports driving heavy capacitive loads (e.g., backplane traces, multiple TTL inputs) without signal degradation. |
| 3-State Leakage | ±50 µA (IOZH/IOZL, VCC = 5.5 V) - Minimizes standby current and prevents false logic states on shared buses. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment. |
| ESD Rating | 2000 V HBM, 200 V MM - Provides handling robustness during PCB assembly and field service without external protection. |
| Latch-up Immunity | >500 mA per JEDEC Std 17 - Guarantees fault tolerance against transient current surges on I/O lines. |
Pinout & Package
MB2245BB,557 is housed in a 52-pin plastic quad flat package (PQFP), SOT379-1, measuring 10 × 10 × 2.0 mm, with gull-wing leads and standard 0.65 mm pitch. The package includes 4 VCC pins (pins 1, 13, 27, 39) and 12 GND pins (pins 4, 7, 10, 16, 20, 24, 30, 33, 36, 42, 46, 50) for low-inductance power delivery and noise suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR (pins 47, 19) | Direction control input | Active-high logic selects data flow direction: DIR = LOW → A→B; DIR = HIGH → B→A. |
| 1OE, 2OE (pins 45, 21) | Output enable input | Active-low logic disables all outputs into high-impedance state, enabling bus sharing without contention. |
| 1A0–1A7, 2A0–2A7 (pins 44,43,41,40,38,37,35,34,32,31,29,28,26,25,23,22) | Data I/O (A-side) | Bidirectional interface pins connected to local controller or processor bus; function as inputs or outputs based on DIR/OE state. |
| 1B0–1B7, 2B0–2B7 (pins 48,49,51,52,2,3,5,6,8,9,11,12,14,15,17,18) | Data I/O (B-side) | Bidirectional interface pins connected to peripheral or memory bus; mirror A-side functionality with independent control. |
| VCC (pins 1,13,27,39) | Positive supply | Distributed power connections minimize IR drop and supply impedance across high-speed switching events. |
| GND (12 pins) | Ground reference | Multiple low-inductance ground paths suppress simultaneous switching noise (SSN) and ensure signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Power-up 3-State | Outputs remain in high-impedance state until VCC stabilizes, preventing bus glitches during power sequencing. |
| Dual independent control | Separate 1DIR/1OE and 2DIR/2OE allow asymmetric bus management-e.g., one side transmitting while the other receives. |
| High noise immunity | Input thresholds (VIL = 0.8 V, VIH = 2.0 V) and 4 pF input capacitance ensure reliable operation in electrically noisy industrial environments. |
| BiCMOS architecture | Combines CMOS low static power (ICCZ = 65 µA) with bipolar speed and drive strength for optimal performance-per-watt. |
| Bus contention prevention | Inputs are disabled during 3-State mode, eliminating leakage paths that could corrupt adjacent bus signals. |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Interfacing a 16-bit microcontroller to distributed I/O modules over a 20 cm backplane trace with 30 pF/cm capacitance. IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus buffering transceiver managing data flow between CPU and remote analog/digital I/O cards. Use Value: 4.5 ns propagation delay ensures setup/hold timing closure at 25 MHz bus clock; ±64 mA drive compensates for trace losses without repeaters. |
Use Scenario: Expanding address/data bus of an 80C188-based motion controller to support additional EPROM and SRAM banks. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver isolating CPU bus from memory expansion bus while supporting read/write cycles. Use Value: Independent DIR/OE pins enable precise cycle-by-cycle control of data direction; power-up 3-State prevents boot-time bus conflicts. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
|
Use Scenario: Connecting a 16-bit MCU to CAN/LIN gateway ICs and sensor ADCs in a body control unit operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Robust bidirectional data bridge between main processor and mixed-signal peripherals with ESD-hardened I/O. Use Value: 2000 V HBM ESD rating and >500 mA latch-up immunity meet automotive component stress requirements without added protection circuitry. |
Use Scenario: Generating synchronized 16-bit stimulus patterns for DUT testing in automated test equipment with programmable direction control. IC Role / Device Role / Timing Role: Programmable-direction bus driver enabling flexible pattern injection and response capture on same physical bus lines. Use Value: Dual OE/DIR inputs allow real-time reconfiguration of data flow direction mid-test sequence without hardware change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVC164245DGGR | 3.3 V only; lower drive (±24 mA); no power-up 3-State; 48-pin TSSOP | Requires level translation for 5V systems; unsuitable for hot-swap or legacy 5V-only designs. | Select only when migrating to 3.3V infrastructure and board layout allows footprint change. |
| 74FCT162245CPAG | 5V-only FCT logic; faster (tPD = 3.5 ns); higher ICC in active state (250 µA); 56-pin SSOP | Higher static power; lacks BiCMOS efficiency; less ESD robustness (1500 V HBM). | Prefer for pure speed-critical 5V systems where power and ESD margins are secondary. |
Compared with SN74ALVC164245DGGR and 74FCT162245CPAG, MB2245BB,557 uniquely delivers 5V operation with BiCMOS efficiency, guaranteed power-up 3-State, and automotive-grade ESD/latch-up specs in a mature PQFP package-making it the only choice for legacy 5V industrial and automotive bus bridging where reliability and compatibility are non-negotiable.
Availability
MB2245BB,557 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, legacy microcontroller bus expansions, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for MB2245BB,557 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
Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator founded in the Netherlands, historically known for high-reliability logic, analog, and automotive ICs.
The MB2245BB,557 belongs to Philips' high-performance BiCMOS bus interface product line, engineered specifically for robust 5V bidirectional data transfer in industrial control, instrumentation, and legacy computing systems demanding noise immunity and long-lifecycle support.
FAQ
What is the maximum operating voltage for MB2245BB,557?
The MB2245BB,557 has an absolute maximum VCC rating of +7.0 V, but its recommended operating range is strictly 4.5 V to 5.5 V per the datasheet. Operating outside this window risks parametric shift or accelerated wear-out; sustained use above 5.5 V violates the specified DC supply voltage limit and may compromise latch-up immunity or timing accuracy in MB2245BB,557.
Does MB2245BB,557 support hot-plug operation?
Yes, MB2245BB,557 supports hot-plug operation due to its power-up 3-State feature: outputs remain in high-impedance until VCC reaches valid logic threshold, preventing bus contention during insertion. This behavior is explicitly documented in the DESCRIPTION section and confirmed by the "Power–up 3-State" feature bullet, making MB2245BB,557 suitable for modular backplane systems requiring live module replacement.
How many independent transceiver sections does MB2245BB,557 contain?
MB2245BB,557 contains two independent 8-bit transceiver sections: Section 1 (pins 1A0–1A7 / 1B0–1B7 / 1DIR / 1OE) and Section 2 (pins 2A0–2A7 / 2B0–2B7 / 2DIR / 2OE). Each section operates autonomously with separate direction and enable controls, enabling asymmetric data flow-for example, Section 1 transmitting while Section 2 receives-without internal coupling or timing dependency in MB2245BB,557.
What is the input capacitance specification for MB2245BB,557?
The input capacitance (CIN) of MB2245BB,557 is 4 pF, measured at VI = 0 V or VCC with Tamb = 25°C. This low value minimizes loading on driving sources and preserves signal edge rates in high-frequency bus applications, directly contributing to the device's ability to maintain <4.5 ns propagation delay in MB2245BB,557 under loaded conditions.
Is MB2245BB,557 pin-compatible with any industry-standard 16-bit transceivers?
No documented pin-compatible replacements exist for MB2245BB,557. Its 52-pin PQFP (SOT379-1) footprint, dual DIR/OE assignment, and specific pin mapping-including 4 VCC and 12 GND pins-are unique to this Philips BiCMOS family. Substitution requires PCB redesign; alternatives like SN74ALVC164245DGGR (48-pin TSSOP) or 74FCT162245CPAG (56-pin SSOP) differ in pin count, pitch, and signal assignment, so MB2245BB,557 cannot be used as a drop-in replacement without layout modification.
MB2245BB,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-QFP (10x10)
MB2245BB,557 FAQ
1.How can I place an order for MB2245BB,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for MB2245BB,557 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 MB2245BB,557 reliable?
The price and inventory of MB2245BB,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MB2245BB,557 is usually 5 days.
3.What payment methods are accepted for MB2245BB,557?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MB2245BB,557 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MB2245BB,557?
MB2245BB,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MB2245BB,557 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 MB2245BB,557?
For technical support, including MB2245BB,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MB2245BB,557 requirements.
6.How does Aetrix verify that MB2245BB,557 is sourced from the original manufacturer or authorized distributors?
All MB2245BB,557 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 MB2245BB,557 meets industry standards.
7.What is the process for return or replacement of MB2245BB,557?
All MB2245BB,557 units undergo pre-shipment inspection (PSI). If there is an issue with MB2245BB,557, 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 MB2245BB,557 part is unused and in its original packaging.
Return procedure for MB2245BB,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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