NXP Semiconductors 74ABT640PW,112

Overview

74ABT640PW,112 from Philips Semiconductors is an octal inverting transceiver with direction control and 3-State outputs, operating at 4.5–5.5 V, delivering ±64 mA/–32 mA drive capability, with 3.1 ns typical propagation delay (An↔Bn), used for bidirectional bus interfacing in industrial control backplanes and legacy data acquisition systems.

For engineers reviewing the 74ABT640PW,112 datasheet, 74ABT640PW,112 pinout, 74ABT640PW,112 application, or 74ABT640PW,112 equivalent, key selection considerations include its inverting logic behavior, DIR/OE dual-control architecture, TSSOP-20 package thermal profile, and 50 µA ICCZ supply current in 3-State mode.

Technical Context

The 74ABT640PW,112 implements a BiCMOS-based octal transceiver with separate Direction (DIR) and Output Enable (OE) inputs, enabling independent control of data flow direction and output state. Its inverting transceiver function applies identical inversion to both A→B and B→A paths, and all I/O pins support live insertion/extraction.

It operates within –40°C to +85°C ambient, requires no external pull-ups for power-up 3-State behavior, and features latch-up protection >500 mA per JEDEC Std 17 and ESD robustness >2000 V (HBM). The device's 7 pF I/O capacitance and 4 pF input capacitance minimize signal integrity impact on high-speed buses.

Key Specifications

Pinout & Package

74ABT640PW,112 is housed in a 20-pin TSSOP (Thin Shrink Small Outline Package), Type I, 4.4 mm body width, lead pitch 0.65 mm, compliant with JEDEC MO-153. Pin 1 is DIR; pins 2–9 are A0–A7; pins 11–18 are B7–B0 (reversed order); pin 10 is GND; pin 20 is VCC; pin 19 is OE (active-low).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT640DBR and 74LVT640PW,118, the 74ABT640PW,112 provides optimal balance of 5 V robustness, proven industrial temperature reliability, and inverting transceiver behavior - making it preferred for brownfield upgrades where signal polarity and timing margins are fixed constraints.

Availability

74ABT640PW,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy data acquisition buses, modular test equipment slots, and hot-swappable I/O modules requiring stable component supply across extended product lifecycles.

Supply support for 74ABT640PW,112 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

Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator with leadership in logic, interface, and automotive ICs, founded in the Netherlands and historically instrumental in defining industry-standard 74-series logic families.

The 74ABT640PW,112 belongs to the ABT (Advanced BiCMOS Technology) logic family, engineered specifically for high-speed, low-power 5 V bus interfacing in industrial and telecom infrastructure where reliability under thermal and electrical stress is critical.

FAQ

What logic polarity does the 74ABT640PW,112 implement on its data paths?

The 74ABT640PW,112 implements inverting logic on both A→B and B→A data paths: when DIR = H and OE = L, A0–A7 inputs appear as inverted signals at B0–B7 outputs; when DIR = L and OE = L, B0–B7 inputs appear as inverted signals at A0–A7 outputs. This behavior is explicitly confirmed in the FUNCTION TABLE and LOGIC SYMBOL sections of the Philips datasheet.

Is the 74ABT640PW,112 pin-compatible with standard 74-series octal transceivers like the 74LS245?

No - the 74ABT640PW,112 is not pin-compatible with the 74LS245. While both are 20-pin octal transceivers, the 74ABT640PW,112 assigns B0–B7 to pins 18–11 (reversed order), whereas the 74LS245 places B0–B7 on pins 11–18. Additionally, DIR replaces the 74LS245's DIR pin (pin 1), and OE replaces its /G (pin 19), requiring PCB layout revision for substitution.

Does the 74ABT640PW,112 support hot-swap operation, and what design provisions enable this?

Yes - the 74ABT640PW,112 explicitly supports live insertion/extraction per its FEATURES section. This is enabled by three integrated provisions: power-up 3-State behavior (outputs remain high-Z until VCC stabilizes), latch-up protection exceeding 500 mA per JEDEC Std 17, and ESD robustness >2000 V HBM - collectively allowing safe connection/disconnection under bias without external protection circuitry.

What is the maximum recommended load capacitance for maintaining specified propagation delay in the 74ABT640PW,112?

The 74ABT640PW,112 specifies propagation delay (tPLH/tPHL = 3.1 ns typical) under test condition CL = 50 pF, as stated in QUICK REFERENCE DATA. Exceeding 50 pF increases delay nonlinearly; for designs targeting ≤4.5 ns max delay across temperature, total load (including trace and probe capacitance) should be held to ≤45 pF to maintain margin against datasheet limits.

How does the 74ABT640PW,112 handle bus contention during direction switching?

The 74ABT640PW,112 avoids bus contention during direction switching through its dual-control architecture: OE must be asserted (low) for either direction path to be active, and DIR changes only affect the enabled path. When OE is high, all A/B pins enter high-impedance state regardless of DIR state - providing a guaranteed contention-free window during reconfiguration.