Diodes Incorporated PI5C3244Q

Overview

PI5C3244Q from Pericom Semiconductor is an 8-bit, dual-port analog bus switch IC with two independent 4-bit switch banks (1A/1B and 2A/2B), pinout- and function-compatible with 74FCT244T, 74F244, and 74ALS/AS/LS244 logic drivers. It features near-zero propagation delay (0.25 ns), 5 Ω typical on-resistance, ultra-low quiescent current (0.2 µA), and operates at 5 V ±5% over –40°C to +85°C for notebook and low-power system bus isolation.

For engineers reviewing the PI5C3244Q datasheet, PI5C3244Q pinout, PI5C3244Q application, or PI5C3244Q equivalent, key selection criteria include its bidirectional 5 Ω switch resistance, dual active-low enable control (BE1/BE2), TTL-compatible input thresholds, and QSOP-20 packaging for space-constrained PCB layouts.

Technical Context

The PI5C3244Q implements eight independent transmission-gate-style bus switches organized as two 4-bit ports, each controlled by a dedicated active-low enable signal (BE1, BE2). Switching is bidirectional with no polarity or logic inversion-signals pass transparently when enabled.

Its architecture eliminates ground bounce and adds negligible RC delay (tPLH/tPHL ≤ 0.25 ns with 50 pF load), making it suitable for high-speed digital bus isolation where signal integrity and timing predictability are critical. The device draws only 0.1–3.0 µA quiescent current and supports 5 V operation with ±0.5 V absolute maximum input voltage range.

Key Specifications

Pinout & Package

PI5C3244Q is housed in a 20-pin QSOP (Quarter-Size Outline Package), 150-mil wide, RoHS-compliant and Pb-free option available (PI5C3244QE).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit bus switch applications.

Compared with SN74CBTD244PW and 74F244SCX, PI5C3244Q delivers superior low-power performance (0.2 µA vs. 20 µA), lower on-resistance (5 Ω vs. 7 Ω), and true zero-delay analog switching-making it optimal for power-sensitive, timing-critical bus isolation where signal transparency is mandatory.

Availability

PI5C3244Q is available at Aetrix Electronics and suitable for laptop memory isolation, industrial PLC I/O expansion, embedded test equipment signal routing, and legacy ISA bus multiplexing requiring stable component supply and long-term obsolescence mitigation.

Supply support for PI5C3244Q 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

Pericom Semiconductor was a fabless provider of high-speed interface, timing, and signal-integrity solutions, acquired by Diodes Incorporated in 2016; its legacy portfolio remains widely deployed in industrial and computing systems.

The PI5Cxx bus switch family targets low-power, low-noise digital bus isolation-designed specifically to replace legacy 74-series buffers in applications demanding zero added propagation delay and minimal power consumption.

FAQ

Is PI5C3244Q compatible with 3.3 V logic systems?

No-PI5C3244Q is specified only for 5 V ±5% operation (VCC = 4.75–5.25 V). Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and switch characteristics are optimized for 5 V TTL/CMOS levels. Using it with 3.3 V supplies risks undefined switching behavior and violates absolute maximum ratings for VCC.

Can BE1 and BE2 be tied together for single-enable operation?

Yes-BE1 and BE2 may be connected to a common control signal to enable both 4-bit ports simultaneously. This configuration replicates the behavior of a standard octal buffer and simplifies firmware control, though independent port control remains available if needed for phased bus activation.

What is the maximum data rate supported by PI5C3244Q?

While not rated for a specific data rate, the combination of 5 Ω RON, 12 pF ON capacitance, and <0.25 ns propagation delay supports clean signal transmission up to ~100 Mbps for NRZ data, assuming proper PCB layout and 50 pF load. System-level bandwidth depends on driver strength and trace impedance.

Does PI5C3244Q include ESD protection diodes on I/O pins?

Yes-the device integrates clamp diodes on all A/B pins, with VIK = –0.7 V (typ) at –18 mA, providing inherent ±2 kV HBM ESD protection per JEDEC JS-001. No external TVS devices are required for basic handling and board-level ESD robustness.