cd74hc123pwr

@@ -0,0 +1,62 @@+# CD74HC123PWR++**Texas Instruments** · Monostable Multivibrators · TSSOP-16++CD74HC123PWR from Texas Instruments, in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1A | input | Monostable 1 trigger input A. Schmitt-trigger input; a HIGH-to-LOW (falling-edge) transition on 1A while 1B is HIGH and 1R is HIGH initiates the MONO 1 output pulse. VIH/VIL per HC-type DC specs (VIH ≥ 0.7·VCC, VIL ≤ 0.3·VCC at VCC = 4.5 V). |+| 2 | 1B | input | Monostable 1 trigger input B. Schmitt-trigger input; a LOW-to-HIGH (rising-edge) transition on 1B while 1A is LOW and 1R is HIGH initiates the MONO 1 output pulse. |+| 3 | 1R | input | Monostable 1 Reset (active LOW). Driving 1R LOW asynchronously terminates the MONO 1 output pulse and forces 1Q LOW / 1Q̄ HIGH; on the 'HC123, a LOW-to-HIGH transition on 1R with 1A LOW and 1B HIGH can also trigger the mono. |+| 4 | 1Q̄ | output | Monostable 1 complementary (inverting) output. Idles HIGH; pulses LOW for the programmed pulse width tW ≈ 0.45·Rx·Cx following a valid trigger. Drives up to 15 LSTTL loads (bus-driver output). |+| 5 | 2Q | output | Monostable 2 non-inverting output. Idles LOW; pulses HIGH for the programmed pulse width tW ≈ 0.45·Rx·Cx following a valid trigger on MONO 2. |+| 6 | 2Cx | passive | External timing-capacitor connection for MONO 2. Connect the timing capacitor Cx between 2Cx (pin 6) and 2Rx/Cx (pin 7); the polarised terminal (if electrolytic) goes on 2Rx/Cx. Cx,min ≈ 0 pF. |+| 7 | 2Rx/Cx | passive | External timing-resistor / capacitor junction for MONO 2. Connect Cx between pin 6 and this pin, and Rx between this pin and VCC. Rx,min ≈ 5 kΩ; pulse width tW ≈ 0.45·Rx·Cx at VCC = 5 V. |+| 8 | GND | power_in | Ground / 0 V reference for the device. |+| 9 | 2R | input | Monostable 2 Reset (active LOW). Driving 2R LOW asynchronously terminates the MONO 2 output pulse; on the 'HC123, a LOW-to-HIGH transition on 2R can also trigger the mono. |+| 10 | 2B | input | Monostable 2 trigger input B. Schmitt-trigger input; a LOW-to-HIGH transition on 2B while 2A is LOW and 2R is HIGH initiates the MONO 2 output pulse. |+| 11 | 2A | input | Monostable 2 trigger input A. Schmitt-trigger input; a HIGH-to-LOW transition on 2A while 2B is HIGH and 2R is HIGH initiates the MONO 2 output pulse. |+| 12 | 2Q̄ | output | Monostable 2 complementary (inverting) output. Idles HIGH; pulses LOW for tW ≈ 0.45·Rx·Cx following a valid trigger. Drives up to 15 LSTTL loads. |+| 13 | 1Q | output | Monostable 1 non-inverting output. Idles LOW; pulses HIGH for the programmed pulse width tW ≈ 0.45·Rx·Cx following a valid trigger on MONO 1. |+| 14 | 1Cx | passive | External timing-capacitor connection for MONO 1. Connect Cx between 1Cx (pin 14) and 1Rx/Cx (pin 15). Cx,min ≈ 0 pF. |+| 15 | 1Rx/Cx | passive | External timing-resistor / capacitor junction for MONO 1. Cx between pin 14 and this pin, Rx between this pin and VCC. Rx,min ≈ 5 kΩ. |+| 16 | VCC | power_in | Positive supply. 2 V to 6 V for 'HC types (this device); typical 5 V. Bypass with a local 100 nF ceramic to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++- `CD74HC123PWR`+- `CD74HC123PWRPWT`+- `CD74HC123PWRE`+- `CD74HC123PWRM`+- `CD74HC123PWRMT`+- `CD74HC123PWRM96`+- `CD74HC123PWRNSR`+- `CD74HC123PWRF3A`++## CAD (KiCad official)++- Symbol: `CD74HC123PWR`+- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`+- 3D model: TSSOP-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/cd74hc123.pdf) (None pp, sha256 `1ae45a9eac40347d`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/cd74hc123pwr-datasheet.pdf)

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