STMicroelectronics STLV3243EBJR

Overview

STLV3243EBJR from STMicroelectronics is a 3-driver/5-receiver RS-232 transceiver with auto-power-down, ±15 kV HBM ESD protection, 250 kbps guaranteed data rate, 6 V/µs minimum slew rate, and Flip-Chip28 package. It implements wake-up via always-active R2 receiver and supports battery-powered serial interfaces in portable computing devices.

For engineers reviewing the STLV3243EBJR datasheet, STLV3243EBJR pinout, STLV3243EBJR application, or STLV3243EBJR equivalent, key selection criteria include auto-power-down current (1 µA shutdown), RS-232 level compliance at 2.3–5.5 V supply, INVALID signal detection timing, and charge-pump capacitor requirements (0.1 µF).

Technical Context

The device integrates dual charge-pump circuitry to generate ±5.5 V rails from a single 2.3–5.5 V supply, enabling full RS-232 voltage swing (±3.7 V min) without external high-voltage sources. Its auto-power-down logic monitors receiver inputs via the INVALID detector and disables drivers when no valid RS-232 signal is present.

R2OUTB remains active during auto-power-down to support wake-up functionality, while FORCEON/FORCEOFF pins provide manual override of power states. The receiver input threshold hysteresis (0.5 V) and ±25 V input range ensure robust noise immunity in noisy industrial or mobile environments.

Key Specifications

Pinout & Package

STLV3243EBJR uses the Flip-Chip28 package (6 × 5 mm, 0.55 mm pitch), a bottom-terminal die-on-substrate construction optimized for low-inductance, high-density PCB layouts in space-constrained portable electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RS-232 transceiver applications.

Compared with MAX3243ESE+ and SP3243ECA-L, STLV3243EBJR uniquely combines dedicated wake-up output (R2OUTB), explicit INVALID status flag, and dual-force control (FORCEON/FORCEOFF) for deterministic power-state management in resource-constrained embedded hosts.

Availability

STLV3243EBJR is available at Aetrix Electronics and suitable for notebook serial ports, handheld medical devices, and industrial barcode scanners requiring stable component supply and long-term lifecycle support.

Supply support for STLV3243EBJR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The STLV3243EBJR belongs to ST's legacy RS-232 transceiver product line, engineered specifically for ultra-low-power portable electronics requiring integrated charge pumps, ESD resilience, and intelligent power management.

FAQ

What is the minimum supply voltage for guaranteed 250 kbps operation?

The STLV3243EBJR guarantees 250 kbps data rate down to 2.3 V supply voltage under specified load conditions (3 kΩ, 1000 pF). Below 2.3 V, timing margins degrade and maximum data rate decreases; operation below 2.3 V is not characterized or recommended.

How does the INVALID output behave during auto-power-down?

The INVALID output goes LOW when no RS-232 signal above ±2.7 V (positive) or below −0.3 V (negative) is detected on any receiver input. It transitions HIGH within 0.2 µs of valid signal arrival and remains HIGH until signal disappears for >30 µs, providing precise cable presence detection.

Can STLV3243EBJR drive an RS-232 mouse directly?

Yes - when FORCEON is held HIGH and FORCEOFF is HIGH, auto-power-down is disabled and the device delivers guaranteed mouse drive capability per EIA/TIA-562. This configuration ensures continuous driver enablement required for optical mouse clock synchronization.

What is the purpose of the R2OUTB pin?

R2OUTB is the complementary (inverted) output of receiver R2, which remains powered during auto-power-down. It provides an active-low wake-up signal to the host processor, enabling immediate response to incoming serial data without waiting for full transceiver initialization.