Texas Instruments 74ALVC164245DGGRE4

Overview

74ALVC164245DGGRE4 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with independent 2.5-V/3.3-V (VCCA) and 3.3-V/5-V (VCCB) supply rails, enabling bidirectional level shifting between voltage domains. It delivers ±24-mA output drive at 3.3 V, achieves 5.8-ns maximum propagation delay, and supports asynchronous data transfer in mixed-voltage systems such as industrial I/O modules interfacing 3.3-V microcontrollers with 5-V peripherals.

For engineers reviewing the 74ALVC164245DGGRE4 datasheet, 74ALVC164245DGGRE4 pinout, 74ALVC164245DGGRE4 application, or 74ALVC164245DGGRE4 equivalent, key selection criteria include verified 2.5-V ↔ 3.3-V and 3.3-V ↔ 5-V translation capability, dual independent enable/direction control per 8-bit section, 48-pin TSSOP package compatibility, and latch-up immunity exceeding 250 mA per JESD17.

Technical Context

The device implements two independent 8-bit transceiver sections (1A/1B and 2A/2B), each with dedicated DIR and OE inputs referenced to VCCA. Direction control determines data flow path (A→B or B→A), while OE places outputs in high-impedance state for bus isolation. Input circuits remain active regardless of OE state, requiring defined logic levels on all A/B ports to prevent excess ICCZ.

VCCA powers control logic (DIR, OE) and A-port I/Os; VCCB powers B-port I/Os. VIH/VIL thresholds track VCCA, enabling robust interface with 2.5-V or 3.3-V controllers. Output drive strength scales with supply voltage: ±24 mA at VCCA = 3.3 V, ±18 mA at VCCA = 2.3 V, and ±24 mA at VCCB = 4.5–5.5 V.

Key Specifications

Pinout & Package

74ALVC164245DGGRE4 is packaged in a 48-pin TSSOP (DGG) with nominal body size 12.50 mm × 6.10 mm. The package features exposed thermal pad (not electrically connected) and standard JEDEC-compliant lead pitch (0.5 mm).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level-shifting transceiver applications.

Compared with SN74LVC164245DGGR, 74ALVC164245DGGRE4 supports true 2.5-V operation and offers tighter tpd spec; versus TXB0108PWR, it provides deterministic directional control essential for parallel bus handshaking but requires explicit DIR management.

Availability

74ALVC164245DGGRE4 is available at Aetrix Electronics and suitable for industrial I/O modules, embedded controller interfacing, telecom line cards, and automotive infotainment gateways requiring stable component supply across extended temperature ranges and mixed-voltage architectures.

Supply support for 74ALVC164245DGGRE4 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 specializing in analog, embedded processing, and logic solutions, with decades of expertise in voltage translation and interface IC design.

The ALVC family targets high-speed, low-voltage bidirectional bus interfacing in mixed-supply systems, emphasizing robustness, timing predictability, and wide operating voltage flexibility for industrial and communications infrastructure.

FAQ

What voltage domains does the 74ALVC164245DGGRE4 support for level shifting?

The 74ALVC164245DGGRE4 supports bidirectional translation between 2.5-V and 3.3-V domains (VCCA = 2.5 V, VCCB = 3.3 V), 3.3-V and 5-V domains (VCCA = 3.3 V, VCCB = 5 V), and reverse directions. Its dual-rail architecture allows independent configuration of each port's supply, making 74ALVC164245DGGRE4 suitable for heterogeneous voltage environments without external level-shifting components.

How does the 74ALVC164245DGGRE4 handle power-up sequencing to avoid bus contention?

The 74ALVC164245DGGRE4 requires OE to be tied to VCCA via a pullup resistor during power-up to ensure outputs remain in high-impedance state until both supplies stabilize. This prevents unintended driving of mismatched voltage buses. The 74ALVC164245DGGRE4 datasheet specifies that OE must ramp with VCCA, and control-side power (VCCA) should be applied before VCCB to guarantee safe initialization of the 74ALVC164245DGGRE4.

Can the 74ALVC164245DGGRE4 operate with only one supply rail powered?

No - the 74ALVC164245DGGRE4 requires both VCCA and VCCB to be within their respective recommended operating ranges (VCCA = 2.3–3.6 V, VCCB = 3–5.5 V) for functional operation. If either supply is absent or out-of-spec, I/O ports enter undefined states, leakage current increases, and latch-up risk rises. The 74ALVC164245DGGRE4 is not designed for single-rail operation.

What is the maximum data rate supported by the 74ALVC164245DGGRE4?

The 74ALVC164245DGGRE4 supports data rates up to 100+ MHz in practice, based on its 5.8-ns maximum propagation delay (tpd) and 10 ns/V input transition rate limit. At 3.3-V operation with 50-pF load, typical rise/fall times are <3 ns, enabling reliable use in high-speed parallel buses like ISA, PCI-X stubs, or custom backplanes. System-level timing must account for board trace delays when calculating total budget for the 74ALVC164245DGGRE4.

Does the 74ALVC164245DGGRE4 require external pullup/pulldown resistors on unused inputs?

Yes - all unused inputs (including DIR and OE) must be actively biased to VCCA or GND per TI application report SCBA004. Floating inputs cause increased ICCZ, unpredictable output states, and potential oscillation. For the 74ALVC164245DGGRE4, tying unused DIR/OE to VCCA via 10-kΩ resistors is recommended; unused A/B port pins may be terminated to VCCA or GND depending on required default logic state, ensuring stable 74ALVC164245DGGRE4 operation.