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Texas Instruments SN74LVCH16T245KR
- Part No.:
- SN74LVCH16T245KR
- Manufacturer:
- Texas Instruments
- Package:
- 56-VFBGA
- Datasheet:
-
SN74LVCH16T245KR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 56BGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,080
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Product details
Overview
SN74LVCH16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting, supporting bidirectional voltage translation between 1.65 V–5.5 V domains on both A and B ports. It features independent VCCA and VCCB rails, tri-state outputs controlled by DIR/OE pins referenced to VCCA, and bus-hold circuitry eliminating external pull resistors. It enables mixed-voltage interconnects in FPGA-to-ASIC or microcontroller-to-peripheral data buses.
For engineers reviewing the SN74LVCH16T245 datasheet, SN74LVCH16T245 pinout, SN74LVCH16T245 application, or SN74LVCH16T245 equivalent, key selection criteria include dual-rail supply flexibility (1.65–5.5 V per port), Ioff partial-power-down support, VCC isolation behavior, bus-hold input retention, and propagation delays as low as 0.3 ns (tPHZ) at 5 V.
Technical Context
The SN74LVCH16T245 implements two independent 8-bit transceiver channels (1A/1B and 2A/2B), each with direction control (1DIR/2DIR) and output-enable (1OE/2OE) inputs tied to VCCA. Its dual-rail architecture allows simultaneous operation of A-port logic levels referenced to VCCA and B-port levels referenced to VCCB - enabling true bidirectional level translation without external biasing.
Functional modes are defined strictly by OE and DIR states: OE = L + DIR = H enables A→B transmission; OE = L + DIR = L enables B→A transmission; OE = H forces both ports into high-impedance regardless of DIR. Input circuits remain active at all times, requiring valid logic levels on all data pins to avoid excess ICCZ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65 V to 5.5 V per rail - supports interoperability across 1.8 V, 2.5 V, 3.3 V, and 5 V logic families without level-shifters. |
| Propagation Delay (tPLH/tPHL) | As low as 0.3 ns (tPHZ @ 5 V) - enables >200 MHz data rates under light load (CL = 15 pF). |
| Ioff Current | ±0.5 μA max - prevents backflow current during partial power-down, protecting powered-down subsystems. |
| Bus-Hold Current (IBHL/IBHH) | ±15 μA to ±100 μA - actively holds unused inputs at valid logic states, removing need for external pull resistors. |
| VCC Isolation | Outputs go high-impedance if either VCCA or VCCB = GND - prevents false signaling during power sequencing. |
| ESD Rating (HBM) | ±2000 V - meets JEDEC JS-001 for robust handling in manufacturing and field environments. |
| Output Drive (IOL/IOH) | ±32 mA at 4.5–5.5 V - sufficient to drive standard CMOS loads and moderate trace capacitance. |
Pinout & Package
SN74LVCH16T245 is available in TSSOP-48 (DGG), TVSOP-48 (DGV), SSOP-48 (DL), and BGA-56 (GQL/ZQL) packages. The TSSOP-48 variant measures 12.50 mm × 6.10 mm and is the most widely used industrial package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A8, 2A1–2A8 | A-port I/O | Data terminals referenced to VCCA; support 1.65–5.5 V logic levels and bus-hold. |
| 1B1–1B8, 2B1–2B8 | B-port I/O | Data terminals referenced to VCCB; tolerate mixed-voltage operation and overvoltage up to 6.5 V. |
| 1DIR, 2DIR | Direction control | Active-high signals (VCCA-referenced) selecting A→B (H) or B→A (L) data flow per channel. |
| 1OE, 2OE | Output enable | Active-high (VCCA-referenced) tri-state controls - OE = H disables both A and B outputs simultaneously. |
| VCCA | A-port supply | Power rail for A-side logic, control inputs, and bus-hold circuitry; must be present for DIR/OE functionality. |
| VCCB | B-port supply | Independent power rail for B-side I/O; enables true bidirectional translation without shared supply constraints. |
| GND | Ground reference | Common return path for both ports; multiple GND pins reduce ground bounce in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.65–5.5 V operation on A and B ports enables seamless interface between disparate logic families (e.g., 1.8 V FPGA ↔ 3.3 V peripheral). |
| VCC isolation | Automatic high-impedance output state when either VCCA or VCCB is at GND - eliminates risk of bus contention during power-up/down sequencing. |
| Integrated bus-hold | Active retention of undriven data inputs at valid logic levels - removes requirement for external pullup/pulldown resistors and saves PCB space. |
| Ioff partial-power-down | Sub-μA off-state current blocks reverse current flow when one side is unpowered - critical for hot-swap and modular system designs. |
| Tri-state output control | Per-channel DIR + OE logic allows independent enable/disable of each 8-bit transceiver block - supports flexible bus arbitration schemes. |
Applications
| Industrial PLC Backplane Interface | FPGA-to-ADC/DAC Data Bridge |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to legacy 5-V analog front-end modules in programmable logic controller chassis. IC Role / Device Role / Timing Role: Bidirectional level translator managing synchronous parallel data transfers between mismatched voltage domains while maintaining signal integrity. Use Value: Eliminates discrete resistor networks and level-shifter ICs, reducing BOM count and layout complexity while supporting 100+ MHz sampling clock domains. | Use Scenario: Connecting a 1.8-V SoC's parallel data bus to 2.5-V high-speed ADCs and DACs in medical imaging signal chain. IC Role / Device Role / Timing Role: Voltage-translating transceiver enabling real-time digitized waveform capture and reconstruction without timing skew or logic-level ambiguity. Use Value: Bus-hold prevents floating inputs during idle cycles; Ioff protects ADC analog section during SoC sleep mode; <1 ns propagation delay preserves sample alignment. |
| Enterprise SSD Controller Interconnect | Automotive Infotainment Memory Expansion |
Use Scenario: Bridging 1.2-V DDR4 memory controller outputs to 1.8-V NAND flash interface in enterprise solid-state drive modules. IC Role / Device Role / Timing Role: Dual-rail bus transceiver performing bidirectional address/data translation with precise OE-controlled tri-state timing for burst-mode access. Use Value: VCC isolation prevents NAND corruption during controller reset; 32-mA drive strength sustains signal integrity across 80-mm PCB traces. | Use Scenario: Expanding RAM capacity in automotive head unit by interfacing 3.3-V application processor to 5-V LPDDR2 memory subsystem. IC Role / Device Role / Timing Role: Level-shifting transceiver managing asynchronous memory read/write handshaking with guaranteed setup/hold margins. Use Value: ±2000-V HBM ESD rating ensures reliability in harsh vehicle environments; bus-hold maintains valid states during CAN bus interrupt latency windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH16T245 | Lower propagation delay (0.2 ns tPHZ), higher drive (±48 mA), but requires VCCA ≥ 2.3 V minimum. | Better suited for >300 MHz interfaces with tighter timing budgets; not compatible with 1.65–1.8 V A-port systems. | Select SN74AVCH16T245 only when VCCA ≥ 2.3 V and sub-ns timing is required; otherwise retain SN74LVCH16T245 for broader voltage coverage. |
| TXB0108 | 8-bit, auto-direction sensing, no DIR pin; lower drive (±24 mA); supports 1.2–3.6 V translation only. | Eliminates direction-control logic but lacks manual DIR override; insufficient for 5-V B-port or high-current loads. | Choose TXB0108 for simple 8-bit unidirectional/mixed-direction links below 3.6 V; use SN74LVCH16T245 for 16-bit, 5-V tolerant, manually controlled applications. |
Compared with SN74AVCH16T245 and TXB0108, the SN74LVCH16T245 uniquely balances 16-bit width, 5-V tolerance, 1.65-V minimum supply, and explicit DIR/OE control - making it optimal for industrial backplanes and mixed-voltage embedded controllers where configurability and voltage range outweigh raw speed.
Availability
SN74LVCH16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-ADC data bridges, and enterprise SSD controller interconnects requiring stable component supply and long-term lifecycle assurance.
Supply support for SN74LVCH16T245 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 delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and enterprise applications.
The SN74LVCH16T245 belongs to TI's LVCMOS-compatible logic portfolio, engineered specifically for robust mixed-voltage system integration where reliable bidirectional level translation, power sequencing resilience, and board-space efficiency are critical design requirements.
FAQ
What voltage ranges does the SN74LVCH16T245 support on its A and B ports?
The SN74LVCH16T245 supports independent supply voltages from 1.65 V to 5.5 V on both VCCA (A port) and VCCB (B port). This enables translation between any combination of 1.8 V, 2.5 V, 3.3 V, and 5 V logic families. Control inputs (DIR/OE) are referenced to VCCA, so VCCA must be present for functional operation of direction and output-enable logic.
How does the VCC isolation feature work in the SN74LVCH16T245?
The VCC isolation feature in the SN74LVCH16T245 ensures that if either VCCA or VCCB is driven to GND (e.g., during power-down), all outputs automatically enter a high-impedance state. This prevents false logic levels or bus contention on either side, making the SN74LVCH16T245 suitable for systems with asymmetric power sequencing or hot-swap capability.
Can the SN74LVCH16T245 operate with floating data inputs?
No - floating data inputs are not permitted on the SN74LVCH16T245. Although it includes active bus-hold circuitry to retain logic states on undriven pins, the input circuitry remains active at all times. Leaving inputs floating increases ICCZ and risks undefined behavior. Unused inputs must be terminated to VCCA, VCCB, or GND per TI application guidance.
What is the maximum data rate supported by the SN74LVCH16T245?
The SN74LVCH16T245 supports data rates exceeding 200 MHz in optimized conditions (e.g., 3.3 V → 5 V translation with CL = 15 pF). This is derived from its minimum propagation delay of 0.3 ns (tPHZ at 5 V) and typical tPLH/tPHL values ranging from 0.3 ns to 21.9 ns depending on VCCA/VCCB combinations and load. Real-world throughput depends on PCB layout, termination, and capacitive loading.
Does the SN74LVCH16T245 require external pull-up resistors on its control pins?
No - external pull-up resistors are not required on DIR or OE pins of the SN74LVCH16T245. These control inputs are CMOS-compatible and referenced to VCCA; they exhibit low leakage (±0.5 μA) and defined VIH/VIL thresholds. However, TI recommends tying OE to VCCA via a pull-up during power-up to guarantee high-impedance state until firmware initializes control logic.
SN74LVCH16T245KR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 56-VFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-BGA Microstar Junior (7x4.5)
SN74LVCH16T245KR FAQ
1.How can I place an order for SN74LVCH16T245KR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH16T245KR 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 SN74LVCH16T245KR reliable?
The price and inventory of SN74LVCH16T245KR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH16T245KR is usually 5 days.
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Once your SN74LVCH16T245KR 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 SN74LVCH16T245KR?
For technical support, including SN74LVCH16T245KR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH16T245KR requirements.
6.How does Aetrix verify that SN74LVCH16T245KR is sourced from the original manufacturer or authorized distributors?
All SN74LVCH16T245KR 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 SN74LVCH16T245KR meets industry standards.
7.What is the process for return or replacement of SN74LVCH16T245KR?
All SN74LVCH16T245KR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH16T245KR, 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 SN74LVCH16T245KR part is unused and in its original packaging.
Return procedure for SN74LVCH16T245KR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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