Renesas 74HC534P-E

Overview

74HC534P-E from Renesas Electronics is an octal D-type flip-flop with inverted 3-state outputs, designed for bus-oriented data latching and driving in digital systems. It features positive-edge clock triggering, independent output control (OC), 2–6 V supply operation, 18 ns typical propagation delay (CL = 50 pF), and ±7.8 mA output drive - enabling reliable bidirectional bus interfacing in industrial control logic.

For engineers reviewing the 74HC534P-E datasheet, 74HC534P-E pinout, 74HC534P-E application, or 74HC534P-E equivalent, key selection criteria include its inverted Q-output polarity versus HD74HC374, 3-state enable timing (tZH/tHZ ≤ 33 ns), fanout capability of 15 LSTTL loads, and DIP-20 package compatibility with legacy through-hole PCB layouts.

Technical Context

This device implements eight edge-triggered D flip-flops with complementary Q̅ outputs and a shared active-high output control (OC) terminal. Each flip-flop samples D-input data on the rising edge of CK and holds it until the next clock transition, while OC forces all outputs into high-impedance regardless of clock or data state.

It operates across a wide VCC range (2–6 V), supports input rise/fall times up to 400 ns at VCC = 6 V, and guarantees setup/hold times of 21 ns/6 ns (min) at 6 V - ensuring robust timing margin in mixed-voltage 5 V/3.3 V system interfaces.

Key Specifications

Pinout & Package

DIP-20 package (PRDP0020AC-B / DP-20NEV), 24.5 mm × 6.3 mm body, 2.54 mm pitch, through-hole mounting, Ni/Pd/Au-plated leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.

Compared with SN74HC574N and 74HC374P-E, the 74HC534P-E uniquely delivers inverted 3-state outputs in the same DIP-20 footprint - eliminating discrete inverters in negative-logic bus systems while maintaining full timing and drive compatibility.

Availability

74HC534P-E is available at Aetrix Electronics and suitable for industrial PLC expansion, legacy bus interface adapters, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for 74HC534P-E 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.

The HD74HC series - including the 74HC534P-E - was developed to provide industry-standard, high-speed CMOS logic with enhanced noise immunity and broad voltage operation for industrial control and instrumentation applications.

FAQ

What is the output polarity of the 74HC534P-E compared to the 74HC374P-E?

The 74HC534P-E provides inverted outputs (Q̅), whereas the 74HC374P-E provides true outputs (Q). This difference is fundamental: the 74HC534P-E drives logic-low when the stored bit is '1', making it suitable for negative-logic bus systems. Both share identical pinout, timing, and electrical specifications except for output polarity - so they are not functionally interchangeable without adjusting downstream logic.

Does the 74HC534P-E support 3.3 V operation?

Yes, the 74HC534P-E fully supports 3.3 V operation within its specified 2–6 V supply range. At VCC = 3.3 V, VIH is guaranteed ≥ 2.0 V and VIL ≤ 1.0 V, providing adequate noise margin against 3.3 V CMOS logic families. Propagation delay increases to ~24 ns (typ), and output drive reduces to ±4.2 mA - still sufficient for most 3.3 V bus loads.

What is the maximum clock frequency supported by the 74HC534P-E?

The 74HC534P-E supports a maximum clock frequency of 28 MHz over its full operating temperature range (–40 to +85°C) at VCC = 4.5 V, and 24 MHz at VCC = 6.0 V. These values derive from the maximum clock pulse width (tw ≥ 17 ns) and propagation delay limits in the datasheet - not theoretical bandwidth. For reliable operation, maintain setup/hold margins per the specified tsu = 21 ns and th = 6 ns (min) at 6 V.

How does the output control (OC) pin behave on the 74HC534P-E?

The OC pin on the 74HC534P-E is active-high: when OC = H, all eight Q̅ outputs enter high-impedance (Z) regardless of clock or data state. When OC = L, outputs respond normally to clock edges. This behavior is asynchronous - OC overrides all internal logic. The pin has standard 74HC input thresholds and draws < 1 µA, allowing direct connection to microcontroller GPIOs without buffering.

Is the 74HC534P-E RoHS compliant?

Yes, the 74HC534P-E is RoHS compliant per EU Directive 2011/65/EU. Renesas Electronics confirms compliance for this part in its official product documentation and environmental reports. The DIP-20 package uses lead-free Ni/Pd/Au plating, and the device contains no restricted substances above threshold limits. Full compliance documentation is available upon request from Aetrix Electronics or Renesas.