Renesas 74HC131P-E

Overview

74HC131P-E from Renesas is a 3-to-8 line decoder/demultiplexer with edge-triggered D-type address registers, operating across 2–6 V supply, delivering 20 ns typical propagation delay (CLK to Y), fanout of 10 LSTTL loads, and low quiescent current (4 µA max). It serves in synchronous address decoding for memory-mapped I/O and control logic in industrial microcontroller systems.

For engineers reviewing the 74HC131P-E datasheet, 74HC131P-E pinout, 74HC131P-E application, or 74HC131P-E equivalent, key selection factors include its positive-edge clocked register behavior, independent dual-enable logic (G1/G2), output-high default state, and DIP-16 package compatibility with legacy through-hole PCB layouts.

Technical Context

The 74HC131P-E integrates three address inputs (A, B, C), a positive-edge-triggered clock (CLK), and two independent enable terminals (G1, G2) that override all select logic - asserting G1 = low or G2 = high forces all eight outputs (Y0–Y7) high regardless of address or clock state. Its internal D-type latch captures address data synchronously on CLK rising edge, decoupling input setup/hold timing from output transitions.

Output drive capability supports ±25 mA per pin with VOH ≥ 4.4 V (VCC = 4.5 V, IOH = –4 mA) and VOL ≤ 0.26 V (IOL = 4 mA), enabling direct interface with TTL and CMOS loads. Input thresholds are rail-relative (VIH ≥ 3.15 V, VIL ≤ 1.35 V at VCC = 4.5 V), ensuring noise immunity in mixed-voltage digital systems.

Key Specifications

Pinout & Package

Dual in-line package (DIP-16), 7.62 mm pitch, 19.2 mm × 6.3 mm body, through-hole mounting. Pin 1 marked by notch or dot; pin 8 = GND, pin 16 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-to-8 decoder with register applications.

Compared with SN74HC138N and CD74HC237E, the 74HC131P-E uniquely combines edge-triggered address registration with open-collector-compatible active-low outputs and dual independent enables - making it the only option among the three that guarantees glitch-free, clock-synchronized decoding without external components.

Availability

74HC131P-E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy microcontroller bus decoding, and test equipment address routing requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.

Supply support for 74HC131P-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 is a global semiconductor leader specializing in microcontrollers, analog, and power solutions for industrial, automotive, and infrastructure markets.

The HD74HC131 product line delivers synchronous logic building blocks for legacy-compatible and upgrade-path digital systems, emphasizing robustness, wide voltage operation, and pin-level interoperability with industry-standard HC-family devices.

FAQ

What is the function of the G1 and G2 enable inputs on the 74HC131P-E?

The G1 and G2 inputs provide independent, complementary enable control for the 74HC131P-E decoder outputs. G1 is active-low and G2 is active-high; if either condition is met - G1 = low OR G2 = high - all eight outputs (Y0–Y7) are forced high, overriding any address or clock state. This dual-enable architecture allows flexible hierarchical gating in multi-chip systems without additional logic gates.

Does the 74HC131P-E require external pull-up resistors on its outputs?

No, the 74HC131P-E features standard CMOS push-pull outputs, not open-drain. Each output (Y0–Y7) actively drives high or low depending on decode state and enable conditions. Pull-up resistors are unnecessary unless interfacing with non-CMOS loads requiring specific voltage levels or bus arbitration - which is not supported natively by the 74HC131P-E.

Can the 74HC131P-E operate reliably at 2.0 V supply voltage?

Yes, the 74HC131P-E is fully specified down to 2.0 V VCC, with guaranteed VIH ≥ 1.5 V and VIL ≤ 0.5 V at that voltage. Propagation delay increases to 210 ns max (CLK to Y), and output drive weakens (IOH/IOL reduced), but all logic functions remain valid - making it suitable for ultra-low-voltage battery-powered systems where timing budgets permit.

Is the 74HC131P-E pin-compatible with other 74HC-series 3-to-8 decoders like the 74HC138?

No, the 74HC131P-E is not pin-compatible with the 74HC138. While both are 16-pin DIP devices, the 74HC131P-E uses pins 1–3 for A/B/C, pin 4 for CLK, pins 5–6 for G2/G1, and pins 7 & 9–15 for Y7–Y0. The 74HC138 assigns pins 1–3 to A/B/C, pins 4–5 to G1/G2 (both active-low), pin 6 to E (active-low), and pins 7 & 9–15 to Y0–Y7 - resulting in incompatible pin mapping and logic behavior.

What is the maximum clock frequency supported by the 74HC131P-E for reliable address latching?

The 74HC131P-E does not specify a maximum clock frequency, but its minimum pulse width (tw) is 14 ns at VCC = 6.0 V and 20 ns at VCC = 4.5 V. To ensure reliable edge-triggered latching, the CLK period must exceed twice the minimum pulse width plus setup/hold margins. For robust operation, limit CLK frequency to ≤25 MHz in typical 4.5–6.0 V designs, verified with actual load capacitance and board layout.