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Texas Instruments 74LVCHR16245AGRG4
- Part No.:
- 74LVCHR16245AGRG4
- Manufacturer:
- Texas Instruments
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74LVCHR16245AGRG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,002
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Product details
Overview
74LVCHR16245AGRG4 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver designed for asynchronous bidirectional data transfer between voltage-domain-isolated buses. It operates from 1.65 V to 3.6 V, accepts 5.5-V-tolerant inputs, features 26-Ω integrated output series resistors, and delivers 4.8 ns max propagation delay at 3.3 V - enabling use in mixed-voltage telecom infrastructure backplanes.
For engineers reviewing the 74LVCHR16245AGRG4 datasheet, 74LVCHR16245AGRG4 pinout, 74LVCHR16245AGRG4 application, or 74LVCHR16245AGRG4 equivalent, key selection criteria include its Ioff-enabled live insertion support, bus-hold input stabilization (eliminating external resistors), 125°C operating temperature rating, and TSSOP-48 package compatibility with high-density PCB layouts.
Technical Context
This device implements two independent 8-bit transceiver channels, each with dedicated direction (DIR) and output-enable (OE) controls. Its dual-control architecture allows simultaneous or asymmetric bus direction management - e.g., A→B on Channel 1 while B→A on Channel 2 - without inter-channel timing dependency.
All 32 I/O pins (16 A-side, 16 B-side) feature 5.5-V tolerant inputs and bus-hold circuitry active regardless of OE/DIR state. The integrated 26-Ω output series resistance is factory-trimmed and applies to all outputs in both enabled and disabled states, suppressing overshoot/undershoot without requiring external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports single-supply operation across 1.8-V, 2.5-V, and 3.3-V logic domains |
| Input Voltage Tolerance | Up to 5.5 V - enables direct interfacing with 5-V legacy peripherals without level-shifting circuitry |
| Max Propagation Delay | 4.8 ns at VCC = 3.3 V - ensures sub-5-ns timing margin for 100-MHz bus cycles |
| Output Drive Strength | ±12 mA per pin - sufficient to drive 50-Ω transmission lines or multiple CMOS loads |
| Ioff Current | ±10 µA at VI/VO = 5.5 V and VCC = 0 V - prevents back-drive damage during hot-swap or partial power-down |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature embedded systems |
| Bus-Hold Current | ±45 µA at VI = 1.7 V (VCC = 3 V) - actively holds floating inputs at valid logic levels without external biasing |
Pinout & Package
TSSOP-48 package (DGG), body size 12.50 mm × 6.10 mm, 0.5-mm pitch, lead-free NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Active-high logic selects data flow direction per channel: DIR = H → A→B; DIR = L → B→A |
| 1OE, 2OE | Output enable input | Active-low control disables all outputs on respective channel into high-impedance state for bus isolation |
| 1A1–1A8, 2A1–2A8 | Port A I/O terminals | First 8 bidirectional data lines per channel; tolerate 5.5 V regardless of VCC |
| 1B1–1B8, 2B1–2B8 | Port B I/O terminals | Second 8 bidirectional data lines per channel; identical electrical specs to Port A |
| VCC (Pins 7, 18, 31, 42) | Power supply | Four distributed VCC pins reduce IR drop and improve noise immunity across wide bus interfaces |
| GND (Pins 4, 10, 15, 21, 28, 34, 39, 45) | Ground reference | Eight GND pins provide low-inductance return paths for all 32 I/Os and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage translation | 5.5-V-tolerant inputs allow seamless interface between 3.3-V microcontrollers and 5-V peripherals |
| Integrated output termination | Factory-matched 26-Ω series resistors eliminate need for discrete 33-Ω or 50-Ω external resistors |
| Live-insertion support | Ioff protection limits current to ±10 µA when VCC = 0 V, enabling safe board replacement in powered systems |
| Self-biasing inputs | Bus-hold circuitry maintains valid logic states on unused A/B port pins without pullup/pulldown resistors |
| High-speed isolation | 6.3 ns max enable/disable time (ten/tdis) ensures rapid bus arbitration in multi-master systems |
Applications
| Telecom Backplane Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Bidirectional data exchange between 3.3-V FPGA-based packet processors and 5-V line-card ASICs in carrier-grade routers. IC Role / Device Role / Timing Role: Voltage-level translating bus transceiver managing 16-bit parallel control/status bus with sub-5-ns timing budget. Use Value: Eliminates four discrete level-shifters and eight pullup resistors per channel, reducing BOM count and layout area by 35%. |
Use Scenario: Isolating programmable logic controller CPU bus from modular analog/digital I/O modules operating at different supply voltages. IC Role / Device Role / Timing Role: Dual-channel transceiver enabling independent direction control for sensor readback (B→A) and actuator command (A→B) paths. Use Value: Ioff and bus-hold features prevent latch-up during hot-swap of I/O modules and eliminate floating-input failures in noisy factory environments. |
| Server Baseboard Management | Test Equipment Data Bus |
Use Scenario: Interfacing 1.8-V BMC (Baseboard Management Controller) with 3.3-V IPMI-compatible sensor hubs and fan controllers. IC Role / Device Role / Timing Role: Low-voltage transceiver providing 5.5-V-tolerant inputs to accept SMBus alerts and GPIO signals from legacy 3.3-V devices. Use Value: Single-chip solution replaces discrete voltage translators and bus buffers, achieving <1.5-ns skew across all 16 bits for synchronized sensor polling. |
Use Scenario: Connecting automated test equipment mainframe to DUT (device under test) interface boards with mismatched logic families. IC Role / Device Role / Timing Role: High-speed bidirectional bus isolator supporting 100-MHz test pattern rates while preventing ground-loop noise coupling. Use Value: Integrated 26-Ω series resistors suppress signal reflections on 15-cm ribbon cables, improving eye diagram margin by 22% at 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245A | No bus-hold; no 5.5-V input tolerance; max VCC = 3.6 V but inputs limited to VCC + 0.3 V | Requires external pullups on unused inputs; cannot interface directly with 5-V sources | Select when cost sensitivity outweighs mixed-voltage flexibility and board space permits external biasing |
| 74ALVC16245 | Faster tpd (3.3 ns @ 3.3 V); higher ICC; no Ioff; bus-hold optional (not standard) | Better suited for ultra-high-speed timing-critical paths but lacks live-insertion safety | Choose only if propagation delay < 3.5 ns is mandatory and system power sequencing guarantees controlled startup/shutdown |
Compared with SN74LVC16245A and 74ALVC16245, the 74LVCHR16245AGRG4 uniquely combines 5.5-V input tolerance, integrated bus-hold, and Ioff in a single TSSOP-48 package - making it the only option qualified for unattended hot-swap in industrial and telecom infrastructure where reliability trumps raw speed.
Availability
74LVCHR16245AGRG4 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and server baseboard management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVCHR16245AGRG4 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 company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74LVCHR16245AGRG4 belongs to TI's Widebus™ family of advanced bus interface ICs, engineered specifically for robust, mixed-voltage data transport in high-reliability infrastructure equipment.
FAQ
What is the maximum input voltage the 74LVCHR16245AGRG4 can tolerate?
The 74LVCHR16245AGRG4 supports input voltages up to 5.5 V regardless of VCC level - a key feature enabling direct connection to 5-V legacy peripherals without external level shifters. This tolerance applies to all A- and B-port data pins and control inputs (DIR, OE), and is specified across the full operating temperature range (–40°C to +125°C). The 74LVCHR16245AGRG4 maintains this rating even when VCC is as low as 1.65 V.
Does the 74LVCHR16245AGRG4 require external pullup or pulldown resistors on unused inputs?
No, the 74LVCHR16245AGRG4 includes active bus-hold circuitry on all data I/O pins (A1–A8, B1–B8 for both channels), which automatically maintains valid logic states on floating inputs. This eliminates the need for external pullup or pulldown resistors. The bus-hold function remains active regardless of OE or DIR state and is fully characterized across the –40°C to +125°C temperature range.
What is the purpose of the Ioff specification for the 74LVCHR16245AGRG4?
The Ioff specification (±10 µA maximum) ensures that when VCC = 0 V, the 74LVCHR16245AGRG4 blocks current flow between powered and unpowered sections of a system - critical for live insertion, partial power-down, and hot-swap applications. This feature prevents damaging back-drive currents from flowing through the device during board replacement or power sequencing events, protecting both the 74LVCHR16245AGRG4 and connected components.
How does the integrated 26-Ω series resistor in the 74LVCHR16245AGRG4 improve signal integrity?
The factory-trimmed 26-Ω series resistor on each output of the 74LVCHR16245AGRG4 damps signal reflections caused by impedance mismatches on PCB traces or cables. This reduces overshoot (<0.8 V) and undershoot (>2 V) at VCC = 3.3 V, eliminating the need for discrete series termination resistors. The result is cleaner edges, improved eye diagrams, and reliable operation at 100-MHz bus rates without additional layout area or BOM cost.
Can the 74LVCHR16245AGRG4 be used as two independent 8-bit transceivers?
Yes, the 74LVCHR16245AGRG4 is explicitly designed as a dual-octal transceiver with fully independent control: Channel 1 (pins 1DIR, 1OE, A1–A8, B1–B8) and Channel 2 (pins 2DIR, 2OE, A1–A8, B1–B8) operate autonomously. Each channel supports separate direction and enable control, allowing simultaneous A→B and B→A data flow - essential for full-duplex protocols like JTAG boundary scan or dual-port memory arbitration.
74LVCHR16245AGRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCHR
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 12mA, 12mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
74LVCHR16245AGRG4 FAQ
1.How can I place an order for 74LVCHR16245AGRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVCHR16245AGRG4 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 74LVCHR16245AGRG4 reliable?
The price and inventory of 74LVCHR16245AGRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVCHR16245AGRG4 is usually 5 days.
3.What payment methods are accepted for 74LVCHR16245AGRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVCHR16245AGRG4 transactions.
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4.How is shipping managed for 74LVCHR16245AGRG4?
74LVCHR16245AGRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVCHR16245AGRG4 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 74LVCHR16245AGRG4?
For technical support, including 74LVCHR16245AGRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVCHR16245AGRG4 requirements.
6.How does Aetrix verify that 74LVCHR16245AGRG4 is sourced from the original manufacturer or authorized distributors?
All 74LVCHR16245AGRG4 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 74LVCHR16245AGRG4 meets industry standards.
7.What is the process for return or replacement of 74LVCHR16245AGRG4?
All 74LVCHR16245AGRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVCHR16245AGRG4, 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 74LVCHR16245AGRG4 part is unused and in its original packaging.
Return procedure for 74LVCHR16245AGRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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