NXP Semiconductors 74AHC573D,112

Overview

74AHC573D,112 from Nexperia is an 8-bit CMOS D-type transparent latch with 3-state outputs, latch enable (LE) and output enable (OE) control, operating from 2.0 V to 5.5 V supply, with propagation delay as low as 3.9 ns at 5 V and 15 pF load, used for bus interfacing and data latching in microcontroller peripheral expansion systems.

For engineers reviewing the 74AHC573D,112 datasheet, 74AHC573D,112 pinout, 74AHC573D,112 application, or 74AHC573D,112 equivalent, this device serves as a voltage-tolerant, low-power octal latch for bidirectional bus isolation, address/data demultiplexing, and mixed-voltage level translation between 3.3 V and 5 V domains.

Technical Context

The 74AHC573D implements eight independent D-type latches with synchronous transparent operation: when LE is HIGH, Qn follows Dn in real time; when LE transitions LOW, the input state is captured and held. OE operates independently to place all outputs in high-impedance mode without affecting latch contents.

Its inputs are overvoltage tolerant up to 5.5 V regardless of VCC, enabling safe interfacing across supply domains. Schmitt-trigger action on all inputs enhances noise immunity, while balanced propagation delays ensure minimal skew between parallel data paths.

Key Specifications

Pinout & Package

74AHC573D,112 uses the SO20 (SOT163-1) package: plastic small outline, 20-pin, 7.5 mm body width, gull-wing leads, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transparent latch applications.

Compared with 74AHC573D,112, the 74AHC373D,112 offers identical functionality and drop-in compatibility, while the SN74LVC573APWR trades voltage flexibility for higher drive in low-voltage-only applications-making the AHC573 the sole choice for mixed-supply robustness.

Availability

74AHC573D,112 is available at Aetrix Electronics and suitable for microcontroller bus expansion, address/data demultiplexing, mixed-voltage level translation, and industrial I/O isolation requiring stable component supply across extended temperature ranges.

Supply support for 74AHC573D,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

Nexperia is a global semiconductor expert delivering high-performance, reliable logic, analog, and discrete components optimized for efficiency and miniaturization in industrial, automotive, and consumer applications.

The 74AHC573 belongs to Nexperia's advanced high-speed CMOS logic family, engineered specifically for low-power, high-noise-immunity bus interfacing in space-constrained and thermally demanding embedded systems.

FAQ

What is the maximum clock frequency supported by the 74AHC573D,112?

The 74AHC573D,112 is not a clocked register but a transparent latch with no internal clock. Its usable data rate depends on propagation delay (as low as 3.9 ns) and setup/hold timing (3.5 ns/1.5 ns). In practice, it supports reliable bus handshaking up to ~100 MHz when paired with appropriate controller timing margins and 15 pF load.

Can the 74AHC573D,112 be used to interface 3.3 V and 5 V logic domains?

Yes-the device features overvoltage-tolerant inputs rated to 5.5 V regardless of VCC. With VCC = 3.3 V, it safely accepts 5 V input signals on D0–D7 and OE/LE, while its CMOS outputs swing rail-to-rail (0 V to 3.3 V), making it ideal for unidirectional 5 V → 3.3 V translation.

Does the 74AHC573D,112 require external pull-up or pull-down resistors on OE or LE?

No-OE and LE are active-HIGH/active-LOW CMOS inputs with negligible leakage (<0.1 μA). They must be driven actively to defined logic levels; floating inputs are prohibited. External resistors are unnecessary unless used for deliberate weak biasing in specific reset or power-up sequencing schemes.

How does the 74AHC573D,112 differ from the 74AHCT573 variant?

The 74AHC573 uses CMOS input thresholds (VIH ≈ 0.7×VCC), while the 74AHCT573 uses TTL-compatible thresholds (VIH = 2.0 V min). This makes the AHCT version better suited for direct connection to legacy 5 V TTL outputs, whereas the AHC version provides superior noise immunity and lower static power in modern CMOS systems.