LSF0204

• Provides bidirectional voltage translation with no direction terminal
• Supports up to 100-MHz up translation and greater than 100-MHz down translation
  at ≤ 30-pF capacitor load and up to 40-MHz up/down translation at 50-pF capacitor load
• Supports I_off, partial power-down mode (refer to Feature Description)
• Allows bidirectional voltage level translation between
  • 0.8 V ↔ 1.8, 2.5, 3.3, 5 V
  • 1.2 V ↔ 1.8, 2.5, 3.3, 5 V
  • 1.8 V ↔ 2.5, 3.3, 5 V
  • 2.5 V ↔ 3.3, 5 V
  • 3.3 V ↔ 5 V
• Low standby current
• 5 V Tolerance I/O port to support TTL
• Low R_on provides less signal distortion
• High-impedance I/O terminals for EN = Low
• Flow-through pinout for easy PCB trace routing
• Latch-up performance exceeds 100 mA per JESD17
• –40°C to 125°C operating temperature range
• ESD performance tested per JESD 22
  • 2000-V human-body model (A114-B, Class II)
  • 200-V machine model (A115-A)
  • 1000-V charged-device model (C101)

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The LSF family consists of bidirectional voltage level translators that operate from 0.8 V to 4.5 V (Vref_A) and 1.8 V to 5.5 V (Vref_B). This range allows for bidirectional voltage translations between 0.8 V and 5.0 V without the need for a direction terminal in open-drain or push-pull applications. The LSF family supports level translation applications with transmission speeds greater than 100 MHz for open-drain systems that utilize a 15-pF capacitance and 165-Ω pull-up resistor.

When the An or Bn port is LOW, the switch is in the ON-state and a low resistance connection exists between the An and Bn ports. The low R_on of the switch allows connections to be made with minimal propagation delay and signal distortion. The voltage on the A or B side will be limited to Vref_A and can be pulled up to any level between Vref_A and 5 V. This functionality allows a seamless translation between higher and lower voltages selected by the user without the need for directional control.

The supply voltage (V_pu#) for each channel may be individually set up with a pull up resistor. For example, CH1 may be used in up-translation mode (1.2 V ↔ 3.3 V) and CH2 in down-translation mode (2.5 V ↔ 1.8 V).

When EN is HIGH, the translator switch is on, and the An I/O is connected to the Bn I/O, respectively, allowing bidirectional data flow between ports. When EN is LOW, the translator switch is off, and a high-impedance state exists between ports. The EN input circuit is designed to be supplied by Vref_A. EN must be LOW to ensure the high-impedance state during power-up or power-down.