Texas Instruments SN74GTLPH3245GKFR

Overview

SN74GTLPH3245GKFR from Texas Instruments is a 32-bit LVTTL-to-GTLP bidirectional bus transceiver with adjustable edge-rate control, 100 mA GTLP B-port drive, 5-V-tolerant A-port inputs, and live-insertion support via Ioff, power-up 3-state, and BIAS VCC. It operates at 3.3 V supply and interfaces LVTTL logic cards to GTLP backplanes in high-speed computing systems.

For engineers reviewing the SN74GTLPH3245GKFR datasheet, SN74GTLPH3245GKFR pinout, SN74GTLPH3245GKFR application, or SN74GTLPH3245GKFR equivalent, key selection criteria include GTLP/LVTTL level translation capability, ERC-controlled rise/fall times (1.2–4 ns), distributed-load backplane timing (tPLH/tPHL ≤ 4.9 ns), 11 Ω minimum load impedance support, and TI-OPC/OEC signal integrity features.

Technical Context

This device implements four independent 8-bit transceivers with noninverting data flow, direction-controlled (DIR) A↔B data routing, and output-enable (OE) isolation. Each segment includes dedicated ERC, BIAS VCC, and VREF pins for per-segment GTLP tuning.

TI-OPC circuitry actively suppresses overshoot on unevenly loaded backplanes during low-to-high transitions, while OEC improves differential input noise immunity and reduces EMI. The B-port uses GTLP signaling (VTT = 1.5 V, VREF = 1 V), and A-port supports LVTTL logic levels with 5-V tolerance - enabling interoperability with TTL and 5-V CMOS systems.

Key Specifications

Pinout & Package

The SN74GTLPH3245GKFR is housed in a 100-pin LFBGA (GKF) package with distributed VCC/GND pins to suppress high-speed switching noise and enable robust power delivery across all four 8-bit segments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Compared with SN74GTLPH3295GKFR and SN74GTL16622DGGR, the SN74GTLPH3245GKFR uniquely delivers transparent DIR-controlled 32-bit flow, per-segment ERC tuning, and full live-insertion capability - making it the sole option for high-reliability, hot-swappable GTLP backplane systems demanding both speed and robustness.

Availability

SN74GTLPH3245GKFR is available at Aetrix Electronics and suitable for high-speed backplane interconnect, modular computing systems, industrial PLC architectures, and automated test equipment requiring stable component supply and long-term obsolescence management.

Supply support for SN74GTLPH3245GKFR 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 logic solutions, with decades of innovation in high-speed interface technology.

The SN74GTLPH3245GKFR belongs to TI's Widebus+™ family, engineered specifically for robust, high-bandwidth communication between LVTTL logic subsystems and GTLP backplanes in mission-critical modular systems.

FAQ

What voltage levels does the SN74GTLPH3245GKFR support on its A-port and B-port interfaces?

The SN74GTLPH3245GKFR A-port operates at LVTTL logic levels (0–3.3 V) and is 5-V tolerant, allowing direct connection to TTL and 5-V CMOS inputs. The B-port operates at GTLP signal levels with VTT = 1.5 V and VREF = 1 V, compliant with JEDEC JESD8-3. Both ports maintain specified timing and drive performance only within their respective recommended operating conditions.

How does the ERC input affect timing performance of the SN74GTLPH3245GKFR?

The ERC input on the SN74GTLPH3245GKFR selects B-port output edge rate: ERC = GND yields slow edges (~4 ns rise/fall), reducing EMI on lightly loaded or sensitive backplanes; ERC = VCC yields fast edges (~1.2–1.8 ns), maximizing data rate on well-terminated 11–50 Ω distributed loads. Propagation delay varies accordingly - e.g., A→B tPLH drops from 4.9 ns (slow) to 3.7 ns (fast) under RLC load conditions.

Does the SN74GTLPH3245GKFR support live insertion, and what circuitry enables it?

Yes, the SN74GTLPH3245GKFR fully supports live insertion via three integrated features: Ioff limits current backflow when powered down; power-up 3-state forces outputs to high-impedance during VCC ramp; and BIAS VCC precharges B-port I/O before VCC stabilization. Together, these prevent bus disturbance, driver conflict, and data corruption during hot-swap - verified per TI's live-insertion specifications across –40°C to 85°C.

What is the function of the BIAS VCC pin on the SN74GTLPH3245GKFR, and how must it be connected?

The BIAS VCC pin on the SN74GTLPH3245GKFR supplies 3.3 V to precharge and precondition B-port I/O lines prior to main VCC application, enabling safe live insertion. It must be connected to 3.3 V *before* VCC and *after* GND in the power sequencing order. If live insertion is not required, BIAS VCC may be tied to VCC, but the recommended sequence remains critical for guaranteed hot-swap operation.

Can the SN74GTLPH3245GKFR operate with GTL (not GTLP) signaling standards?

Yes, the SN74GTLPH3245GKFR supports both GTL (VTT = 1.2 V, VREF = 0.8 V) and GTLP (VTT = 1.5 V, VREF = 1 V) signaling standards. Its AC specifications are guaranteed only for GTLP, but DC parameters remain valid across both modes. Designers must adjust termination and reference voltages accordingly - GTL operation trades noise margin for lower power, while GTLP provides higher noise immunity for demanding backplane environments.