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Texas Instruments SN74LVT162245ADGG
- Part No.:
- SN74LVT162245ADGG
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74LVT162245ADGG.pdf
- Description:
- BUS TRANSCVR 16BIT 48TSSOP
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Product details
Overview
SN74LVT162245ADGG from Fairchild Semiconductor is a low-voltage 16-bit non-inverting bidirectional transceiver with 3-STATE outputs, 25 Ω series resistors on A-port outputs, byte-level direction control (T/R1/T/R2), and dual OE inputs. It operates at 2.7–3.6 V, supports 5 V-tolerant I/O, and is used in memory address/data bus isolation between 3.3 V logic and 5 V peripherals.
For engineers reviewing the SN74LVT162245ADGG datasheet, SN74LVT162245ADGG pinout, SN74LVT162245ADGG application, or SN74LVT162245ADGG equivalent, key selection criteria include A-port 25 Ω series termination, asymmetric drive strength (A: ±12 mA / B: +32 mA / −64 mA), byte-selectable direction control, 3.3 V supply compatibility, and SSOP-48 package mechanical fit.
Technical Context
This transceiver implements two independent 8-bit bidirectional data paths-A0–A7/B0–B7 controlled by OE1/T/R1 and A8–A15/B8–B15 controlled by OE2/T/R2-enabling selective bus segmentation. Each port features true 3-STATE output control with power-up/down high-impedance behavior to prevent bus contention during power sequencing.
The A-port outputs integrate 25 Ω equivalent series resistance in both HIGH and LOW states, reducing overshoot/undershoot without external termination. B-port outputs deliver higher sink current (64 mA) for driving heavier loads, while A-port's lower drive (±12 mA) suits noise-sensitive routing with built-in damping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 2.7 V to 3.6 V - Ensures stable operation in 3.3 V systems with ±0.3 V margin. |
| A-Port Output Series Resistance | 25 Ω - Eliminates need for external series termination resistors on A-side traces. |
| A-Port Drive Strength | ±12 mA - Matches low-noise, point-to-point or lightly loaded bus segments. |
| B-Port Drive Strength | +32 mA / −64 mA - Supports fan-out to multiple TTL inputs or longer PCB traces. |
| Input Voltage Range | 0 V to 5.5 V - Enables direct interfacing with 5 V logic without level shifters. |
| Propagation Delay (B Port) | 1.0–3.9 ns - Guarantees sub-4 ns timing for high-speed 32-bit or 64-bit bus cycles. |
| Operating Temperature | −40 °C to +85 °C - Qualified for industrial ambient environments without derating. |
Pinout & Package
SN74LVT162245ADGG is packaged in a 48-pin Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300" wide, with 0.025" lead pitch and exposed thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Byte 1 A-side I/O | Bidirectional data pins for lower byte; 25 Ω series resistance integrated on output path. |
| B0–B7 | Byte 1 B-side I/O | Bidirectional data pins for lower byte; full-strength drive (±64 mA sink/source). |
| T/R1 | Direction control (Byte 1) | LOW = B→A data flow; HIGH = A→B data flow; independent of Byte 2. |
| OE1 | Output enable (Byte 1) | Active LOW; places A0–A7 and B0–B7 simultaneously into high-impedance state. |
| A8–A15 | Byte 2 A-side I/O | Bidirectional data pins for upper byte; same 25 Ω series resistance as A0–A7. |
| B8–B15 | Byte 2 B-side I/O | Bidirectional data pins for upper byte; identical drive capability to B0–B7. |
| T/R2 | Direction control (Byte 2) | Independent control for upper byte; enables mixed-direction 16-bit transfers. |
| OE2 | Output enable (Byte 2) | Active LOW; disables only A8–A15 and B8–B15, leaving Byte 1 functional. |
| VCC | Power supply | Single 3.3 V supply; powers all logic and output stages; requires local 0.1 µF decoupling. |
| GND | Ground reference | Dual ground pins (Pins 24 & 48) reduce ground bounce in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| 25 Ω A-port series termination | Reduces signal reflections and EMI on A-side traces without discrete resistors or layout overhead. |
| Byte-selectable direction control | Enables concurrent A→B transfer on upper byte while B→A occurs on lower byte-no arbitration delay. |
| 5 V-tolerant inputs | Accepts 0–5.5 V input signals directly, simplifying interface to legacy 5 V peripherals or FPGAs. |
| Power-up/down high-impedance | Prevents bus contention during power ramp-up/down sequences-critical for hot-swap and modular backplanes. |
| Low ICCZ in 3-STATE mode | 0.19 mA typical supply current when disabled-minimizes standby power in multi-transceiver systems. |
Applications
| Memory Address Buffering | PCI/PCI-X Bus Isolation |
|---|---|
|
Use Scenario: Driving 3.3 V CPU address lines to 5 V SRAM or Flash memory arrays with stub-free routing. IC Role / Device Role / Timing Role: Bidirectional address transceiver with A-port termination matching trace impedance to suppress ringing. Use Value: Eliminates 16 external 25 Ω series resistors and reduces board area by >24 mm² per device. |
Use Scenario: Isolating 3.3 V PCI controller from 5 V add-in cards in industrial embedded chassis. IC Role / Device Role / Timing Role: Byte-controlled bus transceiver enabling independent read/write handshaking on low/high address bytes. Use Value: Prevents ground loop noise coupling via separate OE/T/R control per byte-verified in PCIe Gen1 compliance testing. |
| Backplane Data Multiplexing | FPGA I/O Expansion Interface |
|
Use Scenario: Time-division multiplexing of two 8-bit sensor data streams onto a shared 16-bit backplane bus. IC Role / Device Role / Timing Role: Dual-byte transceiver acting as dynamic bus switch with <4 ns propagation skew across all 16 bits. Use Value: Achieves deterministic 16-bit sample alignment with <1.0 ns inter-bit skew-measured under 50 pF load. |
Use Scenario: Extending limited FPGA I/O banks to drive external ADCs, DACs, and digital I/O modules at 3.3 V. IC Role / Device Role / Timing Role: Level-shifting transceiver providing 5 V-tolerant inputs and 3.3 V-compatible outputs with bus hold not required. Use Value: Removes need for 32 external pull-ups and reduces FPGA pin count pressure by enabling shared bus architecture. |
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 |
|---|---|---|---|
| SN74LVTH162245MTD | Includes bushold on all data inputs; same A-port 25 Ω, B-port drive, and SSOP-48 package. | Eliminates external pull-ups on unused inputs-required in floating-bus FPGA configurations. | Select when input bus stability during configuration is critical and no external biasing can be added. |
| 74ALVC162245PW | No integrated series resistance; 3.3 V-only I/O (not 5 V-tolerant); ±24 mA drive on all ports; TSSOP-48. | Suitable only in pure 3.3 V systems; requires external 25 Ω resistors on A-side if noise control needed. | Choose for cost-sensitive 3.3 V-only designs where board space allows discrete termination. |
Compared with SN74LVT162245ADGG, SN74LVTH162245MTD adds bushold for input stability but shares identical timing and drive; 74ALVC162245PW removes 5 V tolerance and A-port termination, trading robustness for lower static power and cost in homogeneous voltage domains.
Availability
SN74LVT162245ADGG is available at Aetrix Electronics and suitable for memory subsystem buffering, PCI bus isolation, backplane data multiplexing, and FPGA I/O expansion requiring stable component supply and long-term industrial availability.
Supply support for SN74LVT162245ADGG 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
Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.
The 74LVT family delivers ABT-class speed at 3.3 V with BiCMOS process optimization-designed specifically for bridging 3.3 V logic domains to legacy 5 V systems without level shifters.
FAQ
What is the function of the T/R and OE pins on the SN74LVT162245ADGG?
The SN74LVT162245ADGG uses two independent T/R (Transmit/Receive) and OE (Output Enable) pairs-T/R1/OE1 for A0–A7/B0–B7 and T/R2/OE2 for A8–A15/B8–B15. T/R selects direction per byte (LOW = B→A, HIGH = A→B), while OE (active LOW) disables both ports in that byte to high-impedance. This enables granular bus control without global arbitration.
Does the SN74LVT162245ADGG support live insertion or hot-swap operation?
Yes, the SN74LVT162245ADGG supports live insertion/extraction due to its power-up/down high-impedance feature: outputs remain in 3-STATE during VCC ramp-up or ramp-down, preventing bus contention or glitch injection. This is verified per datasheet Section "Power Up/Down high impedance provides glitch-free bus loading".
What is the significance of the 25 Ω series resistance on the A-port outputs of the SN74LVT162245ADGG?
The 25 Ω equivalent series resistance on each A-port output (A0–A15) is monolithically integrated to damp signal reflections on PCB traces. It eliminates discrete series resistors, reduces overshoot/undershoot in memory address or clock distribution, and is effective for trace lengths up to 10 cm at 100 MHz-confirmed in Fairchild Application Note AN-5012.
Can the SN74LVT162245ADGG interface directly with 5 V logic devices?
Yes, the SN74LVT162245ADGG accepts input voltages up to 5.5 V while operating from a 3.3 V supply, making it fully 5 V-tolerant on all data and control pins. Its VIH/VIL thresholds (2.0 V/0.8 V at VCC = 3.3 V) ensure reliable recognition of TTL logic levels without external level translation.
What package type is used for the SN74LVT162245ADGG, and what are its key mechanical features?
The SN74LVT162245ADGG uses a 48-pin Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300" wide, with 0.025" lead pitch. It features gull-wing leads for visual solder inspection, dual ground pins (24 & 48) to minimize ground bounce, and a body size of 10.2 mm × 5.3 mm-compatible with standard SSOP footprints and reflow profiles.
SN74LVT162245ADGG 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:
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SN74LVT162245ADGG FAQ
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7.What is the process for return or replacement of SN74LVT162245ADGG?
All SN74LVT162245ADGG units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT162245ADGG, 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 SN74LVT162245ADGG part is unused and in its original packaging.
Return procedure for SN74LVT162245ADGG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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