Texas Instruments LSF0204YZPR

Overview

LSF0204YZPR from Texas Instruments is a 4-bit bidirectional multi-voltage level translator IC designed 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 across –40°C to 125°C for telecom and industrial I²C/PMBus interconnects.

For engineers reviewing the LSF0204YZPR datasheet, LSF0204YZPR pinout, LSF0204YZPR application, or LSF0204YZPR equivalent, key selection criteria include its flow-through DSBGA-12 pinout, 5-V-tolerant I/Os, low on-resistance (≤4 Ω), EN-controlled high-impedance state, and compatibility with GPIO, MDIO, SMBus, and UART in mixed-voltage embedded systems.

Technical Context

The LSF0204YZPR implements a passive FET-based switch architecture-no internal logic or buffers-where translation direction is determined dynamically by relative voltage levels on A/B ports. Each of its four bidirectional channels operates independently with user-configurable V_{ref_A} (0.8–4.5 V) and V_{ref_B} (1.8–5.5 V), enabling per-channel voltage mapping such as 1.2 V ↔ 3.3 V and 2.5 V ↔ 5 V simultaneously.

EN is referenced to V_{ref_A} and active-high for LSF0204YZPR (distinct from LSF0204D's active-low EN). When EN = HIGH, low-R_on (<4 Ω typical) connects A_n–B_n; when EN = LOW, all I/Os enter high-impedance state. The device supports I_off mode with ±1 µA leakage when both V_ref rails are at 0 V.

Key Specifications

Pinout & Package

LSF0204YZPR uses a 12-ball DSBGA package (1.90 mm × 1.40 mm, 0.5-mm pitch) with bottom-side solder balls and A1 corner marked by a dot. Its flow-through pinout minimizes PCB routing complexity and crosstalk in high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0104EYZTR and SN74AVC4T245RTER, LSF0204YZPR uniquely delivers passive, directionless translation with sub-µA standby current and DSBGA-12 compactness-making it optimal for space-constrained, low-power I²C/PMBus bridges where pin count and quiescent power are critical.

Availability

LSF0204YZPR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive infotainment systems requiring stable component supply, extended temperature operation, and long-term obsolescence management.

Supply support for LSF0204YZPR 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 technologies, with decades of expertise in interface solutions and automotive-grade reliability.

The LSF family was engineered specifically for high-speed, low-power bidirectional level translation in mixed-voltage digital systems-targeting I²C, SMBus, PMBus, MDIO, and GPIO applications where direction control is impractical or undesirable.

FAQ

What is the function of the EN pin on the LSF0204YZPR?

The EN pin on the LSF0204YZPR is an active-high enable input referenced to V_{ref_A}. When EN is HIGH, the internal pass transistors connect A_n–B_n pairs, enabling bidirectional translation. When EN is LOW, all I/Os enter a high-impedance state. This allows dynamic isolation of voltage domains during power sequencing or system sleep-critical for managing wake-up behavior in the LSF0204YZPR.

Can the LSF0204YZPR translate between 1.2 V and 5 V?

Yes, the LSF0204YZPR explicitly supports 1.2 V ↔ 5 V bidirectional translation, as confirmed in its feature list and voltage mapping table. To implement this, set V_{ref_A} = 1.2 V and V_{ref_B} = 5 V, ensure EN is supplied from V_{ref_A}, and use appropriate pull-up resistors (e.g., 310 Ω nominal for 5 V side at 15 mA). This capability is validated in the LSF0204YZPR's AC performance tables for translating up (1.2 V → 5 V) and down (5 V → 1.2 V).

Does the LSF0204YZPR require external pull-up resistors?

Yes, the LSF0204YZPR requires external pull-up resistors on both A and B sides for open-drain operation (e.g., I²C), and on the B side for push-pull translation. Pull-up values depend on V_pu and desired current: for 5 V V_pu, use 310 Ω nominal (15 mA); for 3.3 V, use 197 Ω. These resistors establish proper logic thresholds and limit pass-transistor current to maintain low R_on voltage drop-essential for signal integrity in the LSF0204YZPR.

How does the LSF0204YZPR handle power sequencing?

The LSF0204YZPR has no strict power sequencing requirement: EN is powered from V_{ref_A}, and I_off mode activates automatically when V_{ref_A} = V_{ref_B} = 0 V. If V_{ref_A} powers up first, EN becomes valid immediately, and I/Os remain in Hi-Z until V_{ref_B} stabilizes. This fault-tolerant behavior prevents bus contention during ramp-up-making the LSF0204YZPR robust in complex multi-rail systems.

Is the LSF0204YZPR compatible with I²C Fast Mode Plus (1 MHz)?

Yes, the LSF0204YZPR supports I²C Fast Mode Plus (1 MHz) operation. Its 40-MHz up/down translation capability at 50-pF load exceeds the 1-MHz clock frequency requirement, and its <5 ns propagation delay (t_PLH/t_PHL) preserves setup/hold timing margins. Verified in TI's application note SNVA725, the LSF0204YZPR maintains signal integrity on SDA/SCL lines with standard 1-kΩ pull-ups and ≤20 pF trace capacitance-fully compliant for LSF0204YZPR-based I²C designs.