NXP Semiconductors 74HCT7030N,112

Overview

74HCT7030N,112 from NXP Semiconductors (formerly Philips) is a 9-bit × 64-word synchronous/asynchronous FIFO register with 3-state outputs, master reset (MR), output enable (OE), and dual status flags (DIR/DOR). It delivers 29 MHz max clock frequency (HCT), 20 ns typical propagation delay (SO to Qn), and operates at 4.5 V supply. It serves as a high-speed data buffer in video timebase correction and A/D output staging.

For engineers reviewing the 74HCT7030N,112 datasheet, 74HCT7030N,112 pinout, 74HCT7030N,112 application, or 74HCT7030N,112 equivalent, key selection criteria include DIR/DOR flag timing behavior, 3-state output control via OE, cascading capability for 128-word expansion, and HCT-level TTL-compatible input thresholds.

Technical Context

The 74HCT7030N,112 implements a Si-gate CMOS FIFO architecture with independent shift-in (SI) and shift-out (SO) controls, enabling fully asynchronous read/write operations. Its DIR flag asserts HIGH when the input stage is empty and ready; DOR asserts HIGH only when valid data resides at Q0–Q8 outputs - not merely after SO activation.

It supports three operational modes: flag-controlled (DIR/DOR–gated), high-speed burst (ignoring flags, up to 26 MHz), and cascaded (two devices yield 128 × 9-bit depth with no external logic). Ripple-through delay (SI to DOR) is 1.6 µs typ., and bubble-up delay (SO to DIR) is 2.0 µs typ. at VCC = 4.5 V.

Key Specifications

Pinout & Package

74HCT7030N,112 uses a 28-pin plastic dual in-line package (PDIP) with 0.6-inch body width and standard through-hole mounting. Pin 14 is GND; pins 1 and 2 are GND (must not conduct current relative to pin 14); pin 28 is VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FIFO register applications.

Compared with 74HCT7030N,112, the 74HC7030N,652 trades TTL compatibility for lower power, while the SN74ACT7805N offers greater capacity and speed at the cost of layout and software rework - making 74HCT7030N,112 optimal for legacy 5 V systems requiring proven, pin-defined FIFO buffering.

Availability

74HCT7030N,112 is available at Aetrix Electronics and suitable for high-speed disc controllers, video timebase correction circuits, A/D converter output buffering, and digital filter I/O formatting requiring stable component supply and long-term industrial availability.

Supply support for 74HCT7030N,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

NXP Semiconductors, formerly Philips Semiconductors, designs high-reliability logic and interface ICs for industrial, automotive, and communications infrastructure.

The 74HCT7030N,112 belongs to the 74HCT family of TTL-compatible CMOS logic devices engineered for robust 5 V system interfacing with low power and high noise immunity.

FAQ

What is the function of the DIR and DOR flags in the 74HCT7030N,112?

The DIR (data-in-ready) flag goes HIGH when the FIFO input stage is empty and ready to accept new data; it goes LOW when the FIFO is full or a shift-in operation is incomplete. The DOR (data-out-ready) flag goes HIGH only when valid data is present at Q0–Q8 outputs - not merely after an SO pulse - and goes LOW when the output stage is busy or empty. These flags enable handshake-based data flow control without CPU polling in the 74HCT7030N,112.

Can the 74HCT7030N,112 operate in both synchronous and asynchronous modes?

Yes, the 74HCT7030N,112 supports both modes. In asynchronous mode, SI and SO edges independently trigger data movement regardless of clock alignment. In synchronous mode, external logic can align SI/SO pulses to a common clock edge. The device does not contain an internal clock generator - timing is fully edge-triggered and externally controlled in the 74HCT7030N,112.

How does cascading two 74HCT7030N,112 devices increase memory capacity?

Cascading two 74HCT7030N,112 units forms a 128-word × 9-bit FIFO without external logic. The first device's DOR drives the second's SI, and the second's DIR feeds back to the first's SO. This creates automatic handshaking where data ripples from input of FIFOA to output of FIFOB. The 74HCT7030N,112 datasheet confirms this configuration achieves 22 MHz typical cascaded throughput.

What are the voltage and timing requirements for the MR (master reset) input on the 74HCT7030N,112?

The MR input on the 74HCT7030N,112 is active LOW and must be held LOW for ≥18 ns (min) at VCC = 4.5 V to guarantee reliable reset. It accepts TTL-compatible thresholds: VIL ≤ 0.8 V, VIH ≥ 2.0 V. During reset, DIR goes HIGH and DOR goes LOW, invalidating all stored data and clearing internal control states - a required initialization step before first use of the 74HCT7030N,112.

Is the 74HCT7030N,112 pin-compatible with other members of the 74HC/HCT7030 family?

Yes, the 74HCT7030N,112 shares identical pinout and package (28-pin PDIP) with all variants in the 74HC/HCT7030 family, including 74HC7030N,652 and 74HCT7030D,623. Functional differences (e.g., input thresholds, propagation delays, max frequency) exist between HC and HCT versions, but PCB layout and socketing are interchangeable - enabling direct substitution where electrical specs align in the 74HCT7030N,112 design.