Texas Instruments LSF0204DYZPR

Overview

LSF0204DYZPR from Texas Instruments is a 4-bit bidirectional multi-voltage level translator for open-drain and push-pull interfaces, supporting up to 100-MHz down-translation (3.3 V → 1.8 V, CL = 30 pF) and 40-MHz up/down translation at 50-pF load. It enables voltage translation between 0.8 V ↔ 5 V pairs without direction control, features I_off partial power-down mode, and operates from –40°C to 125°C. It is used in I²C, SMBus, PMBus, and MDIO signal bridging between mixed-voltage SoCs and peripherals.

For engineers reviewing the LSF0204DYZPR datasheet, LSF0204DYZPR pinout, LSF0204DYZPR application, or LSF0204DYZPR equivalent, this device delivers verified bidirectional level shifting across 0.8–5.0 V domains with flow-through TSSOP-14 pinout, low on-resistance (≤4 Ω), 5-V-tolerant I/Os, and EN-controlled high-impedance state-critical for industrial telecom interface isolation and hot-swap compatibility.

Technical Context

The LSF0204DYZPR implements a passive MOSFET-based switch architecture with no internal logic or direction pin, relying on external pull-up resistors and reference voltages (Vref_A: 0.8–4.5 V; Vref_B: 1.8–5.5 V) to establish translation thresholds. Its EN pin is referenced to Vref_A and active-low for the 'D' variant, enabling synchronous high-impedance disable across all four channels.

Signal integrity is maintained via low Ron (3–10 Ω depending on Vref and current), minimal propagation delay (t_PLH/t_PHL ≤ 5.49 ns at CL = 50 pF), and controlled switching characteristics optimized for open-drain bus topologies. It supports channel-specific voltage pairing-e.g., A1/B1 at 1.2 V ↔ 3.3 V while A2/B2 runs 1.8 V ↔ 5 V-without inter-channel coupling.

Key Specifications

Pinout & Package

LSF0204DYZPR is packaged in a 12-ball DSBGA (YZP) with 1.90 mm × 1.40 mm body size and bottom-side ball layout. The package supports fine-pitch PCB assembly and thermal performance optimized for space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level translation applications.

Compared with TXS0104E and SN74AVC4T245, LSF0204DYZPR uniquely combines true bidirectional operation without direction control, I_off power-down, and open-drain bus compatibility-making it the only choice for space-constrained, low-power I²C/PMBus bridges requiring zero-external-component implementation.

Availability

LSF0204DYZPR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive infotainment systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q200-aligned reliability validation.

Supply support for LSF0204DYZPR 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 connectivity solutions, with decades of expertise in interface IC design and automotive-grade qualification.

The LSF family was engineered specifically for high-speed, low-latency bidirectional voltage translation in mixed-signal systems-targeting I²C, SMBus, PMBus, and MDIO applications where direction pins, external logic, or power inefficiency are unacceptable.

FAQ

What is the function of the EN pin on the LSF0204DYZPR?

The EN pin on the LSF0204DYZPR is an active-low enable input referenced to Vref_A. When EN is pulled low, all A- and B-side I/Os enter a high-impedance state, effectively disconnecting both voltage domains. This feature enables clean power sequencing and bus isolation during system reset or sleep modes. The LSF0204DYZPR requires EN = low to guarantee Hi-Z during power-up, and its logic threshold scales with Vref_A (e.g., VIL = 0.3×Vref_A).

Does the LSF0204DYZPR support 1.2-V to 3.3-V bidirectional translation?

Yes, the LSF0204DYZPR explicitly supports 1.2-V ↔ 3.3-V bidirectional translation, as confirmed in the device's supported voltage pair list and validated in Section 7.7 (Translating Down, 3.3 V to 1.2 V) and Section 7.9 (Translating Up, 1.2 V to 1.8 V). At CL = 30 pF, it achieves f_MAX = 100 MHz in down-translation mode and maintains t_PLH/t_PHL ≤ 4.7 ns-making it suitable for high-speed MDIO and low-voltage sensor interfaces.

How does the LSF0204DYZPR differ from the standard LSF0204 in terms of enable logic?

The LSF0204DYZPR uses active-low enable logic (EN = low disables translation), whereas the standard LSF0204 uses active-high enable (EN = high enables translation). This distinction is documented in the Device Comparison Table and Pin Functions section: EN for LSF0204D is "active Low; referenced to Vref_A", while LSF0204 EN is "active High". Both share identical translation performance, pinout, and voltage ranges-only the enable polarity differs.

Can the LSF0204DYZPR be used with open-drain and push-pull drivers simultaneously?

Yes, the LSF0204DYZPR supports both open-drain and push-pull drivers on either side, as stated in the device description and Application section. For push-pull use, ensure unidirectional data flow or external 3-state control to avoid contention; for open-drain, no direction control is needed. The LSF0204DYZPR's low Ron (≤4 Ω) and 5-V-tolerant I/Os maintain signal fidelity in both configurations without external components.

What is the maximum capacitive load the LSF0204DYZPR can drive at 100-MHz translation speed?

The LSF0204DYZPR achieves 100-MHz translation speed only with ≤30-pF total capacitive load, as specified in the Features section and verified in Sections 7.6 and 7.7 (AC Performance tables). At 50-pF load, maximum speed drops to 40 MHz. Load includes PCB trace capacitance, probe effects, and connected device inputs-designers must limit net capacitance to ≤30 pF to sustain 100-MHz operation, especially in down-translation (e.g., 3.3 V → 1.8 V).