Nice — you can do a clean pulse + latch using a single quad Schmitt-NAND chip: 74HC132 (or 74LVC132 for 3.3 V systems). The HC132 contains four 2-input NAND gates with Schmitt inputs so you can both clean a noisy SYN480R DATA line and build an SR latch (NAND SR is active-LOW) inside one package. Only a few passives and a driver transistor are needed.

Below is a ready-to-build recipe (parts, wiring, explanation, tuning tips, and an ASCII schematic) — no extra logic ICs required.

Parts (per latch)

1 × 74HC132 (quad 2-input NAND with Schmitt inputs).

If your system is 3.3 V use 74LVC132 / 74HC132 rated for 3.3 V.

Rin = 47 kΩ (input series)

Cfilter = 10 nF (input RC to ground) — tweak for debounce/clean time

Rpulldown = 100 kΩ (pull-down at input node, optional)

Rpullup = 100 kΩ (pull-up for active-LOW R input so reset is idle HIGH)

Rbase = 10 kΩ, Q = 2N2222 (NPN) or small N-MOSFET (2N7002) to drive your load

Diode for relay flyback (1N4001) if you drive a coil

Optional small cap 0.1 µF decoupling at VCC of IC

Concept / how it works (short)

Use Gate1 (G1) of 74HC132 as a Schmitt inverter by tying its two inputs together and feeding a small RC filter from SYN480R.DATA. This removes HF noise and provides a clean logic transition. Because it's a NAND with tied inputs its function becomes an inverter with Schmitt behavior.

Use G2 & G3 as the cross-coupled NAND pair forming an SR latch (active-LOW inputs S̄ and R̄).

A low on S̄ sets Q = HIGH.

A low on R̄ resets Q = LOW.

Wire the cleaned/inverted output of G1 to S̄. A valid received pulse (DATA high) produces a clean LOW on S̄ (because G1 inverts), setting the latch reliably even if the pulse is brief.

R̄ is your reset input (pushbutton, HT12D VT, MCU line, etc.) — idle pulled HIGH.

Q drives an NPN/MOSFET to switch your load (relay, LED, etc.).

Recommended wiring (pin mapping, assume one chip; use datasheet pin numbers)

I’ll refer to the 4 gates as G1, G2, G3, G4. Use G4 optionally for additional conditioning or to build a toggler later.

SYN480R.DATA --- Rin (47k) ---+--- Node A ---||--- Cfilter (10nF) --- GND | Rpulldown (100k) --- GND (optional, keeps node low)

Node A -> both inputs of G1 (tie inputs A and B of Gate1 together) G1 output -> S̄ (S_bar) (input1 of Gate2)

Gate2 (G2): inputs = S̄ and Q̄ -> output = Q Gate3 (G3): inputs = R̄ and Q -> output = Q̄

R̄ --- Rpullup (100k) --- VCC (reset is idle HIGH; pull low to reset) (optional) R̄ can be wired to a reset pushbutton to GND or to an MCU pin

Q -> Rbase (10k) -> base of 2N2222 (emitter GND; collector to one side of relay coil) Other side of relay coil -> +V (appropriate coil voltage) Diode across coil

If you prefer MOSFET low side switching:

Q -> gate resistor 100Ω -> gate of 2N7002 2N7002 source -> GND ; drain -> relay coil low side

A simulated blinking LED circuit using an astable multivibrator a.k.a "flip-flop" as a square wave generator.