Texas Instruments TPS3422EGDRYT

Overview

TPS3422EGDRYT from Texas Instruments is a single-channel, low-power push-button reset controller in a 1.45-mm × 1.00-mm USON-6 package. It monitors one input (PB1) with internal pullup, asserts an active-low open-drain RST pulse after a user-configurable 7.5-s (TS = GND) or 0-s (TS = VCC) delay, and holds RST low for a fixed 400-ms duration-enabling reliable system reset in portable consumer devices such as smart phones and tablets.

For engineers reviewing the TPS3422EGDRYT datasheet, TPS3422EGDRYT pinout, TPS3422EGDRYT application, or TPS3422EGDRYT equivalent, key selection criteria include its 250-nA standby current at 3.3 V, ±40°C to +125°C operating range, 1.6–6.5-V supply compatibility, fixed 400-ms reset pulse, and TS-pin programmable timing-critical for battery-sensitive, space-constrained embedded reset designs.

Technical Context

The TPS3422EGDRYT implements a digital logic-based delay generator with two-state TS pin selection (GND/VCC) to configure tTIMER between 7.5 s and 0 s. Its internal pullup on PB1 eliminates external components, and its open-drain RST output supports wire-OR interfacing with other reset sources up to 6.5 V.

Reset assertion requires PB1 held low ≥tTIMER; deassertion occurs automatically after fixed tRST = 400 ms (typ), independent of PB1 state. The device enters functional mode only after VCC exceeds 1.6 V and stabilizes for ≥300 µs (tSD), ensuring clean power-on behavior without spurious resets.

Key Specifications

Pinout & Package

TPS3422EGDRYT is housed in a 6-pin USON (DRY) package measuring 1.45 mm × 1.00 mm × 0.5 mm, optimized for ultra-compact portable designs. The exposed pad is electrically connected to GND for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar push-button reset controller applications.

Compared with TPS3421EGDRYT and MAX6369KA+T, the TPS3422EGDRYT delivers the lowest standby current (250 nA vs 350 nA and 1.5 µA), smallest footprint (1.45 × 1.00 mm vs 2.9 × 1.6 mm), and integrates PB1 pullup-making it optimal for next-gen compact, battery-critical reset applications.

Availability

TPS3422EGDRYT is available at Aetrix Electronics and suitable for smartphone power sequencing, tablet system recovery, and portable medical device safety reset requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3422EGDRYT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS342x family was designed specifically for ultra-low-power, space-constrained push-button reset applications-addressing the need for deterministic, battery-friendly hardware reset control in modern portable and safety-critical systems.

FAQ

What is the function of the TS pin on the TPS3422EGDRYT?

The TS pin on the TPS3422EGDRYT selects between two push-button timer durations: tying TS to GND configures tTIMER = 7.5 s (typ), while tying TS to VCC configures tTIMER = 0 s (factory test mode only). This pin must remain static during normal operation-changes should occur only during power-off or when PB1 is high-to prevent false triggering.

Does the TPS3422EGDRYT require an external pullup resistor on PB1?

No, the TPS3422EGDRYT does not require an external pullup resistor on PB1 because it integrates a 65-kΩ internal pullup to VCC. This eliminates a discrete component, reduces PCB area, and simplifies layout-unlike the TPS3421EGDRYT, which requires external pullups on both PB1 and PB2.

What is the maximum sink current capability of the RST output on the TPS3422EGDRYT?

The RST output of the TPS3422EGDRYT can sink up to 8 mA while maintaining VOL ≤ 0.4 V (at VCC ≥ 4.5 V), 5 mA (VCC ≥ 3.3 V), or 3 mA (VCC ≥ 1.6 V). This ensures compatibility with standard logic families and allows flexible pullup resistor selection (1 kΩ to 1 MΩ) based on downstream capacitance and timing needs.

How does the TPS3422EGDRYT behave during power-up?

Upon VCC ramp-up, the TPS3422EGDRYT enters functional mode after a 300-µs start-up delay (tSD). During this period, RST remains high-impedance. Once operational, RST responds to PB1 state only if VCC ≥ 1.6 V; below 1.3 V, RST is not guaranteed high-impedance, so proper power sequencing is essential for predictable reset behavior.

Can the TPS3422EGDRYT's RST output interface with a 5-V logic system?

Yes, the TPS3422EGDRYT's open-drain RST output can interface with 5-V logic systems: simply use an external pullup resistor connected to the 5-V rail. The RST pin tolerates voltages up to 6.5 V regardless of VCC, enabling level-shifting without additional components-ideal for mixed-voltage system architectures.