SN74HC283

@@ -0,0 +1,60 @@+# SN74HC283++**Texas Instruments** · 4-bit binary full adder · SOIC-16++A 4-bit binary full adder in high-speed CMOS, SOIC-16, the arithmetic building block of discrete logic. It adds two 4-bit numbers (A0-A3 and B0-B3) plus a carry-in and produces a 4-bit sum (S0-S3) and a carry-out, with an internal fast (look-ahead) carry so the result settles quickly. Chain the carry-out of one into the carry-in of the next to add 8, 12, or more bits, and with a little logic on one operand it also subtracts. It is how counters, ALUs, and address arithmetic were built before microprocessors absorbed them. Runs 2-6 V.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | S1 | output | Sum bit 1 output. Bit 1 of the 4-bit binary sum of the A and B operands including the carry-in. |+| 2 | B1 | input | Bit 1 of the B operand (4-bit binary addend). CMOS logic input. |+| 3 | A1 | input | Bit 1 of the A operand (4-bit binary augend). CMOS logic input. |+| 4 | S0 | output | Sum bit 0 (least-significant) output. Bit 0 of the 4-bit binary sum of the A and B operands including the carry-in. |+| 5 | A0 | input | Bit 0 (least-significant) of the A operand (4-bit binary augend). CMOS logic input. |+| 6 | B0 | input | Bit 0 (least-significant) of the B operand (4-bit binary addend). CMOS logic input. |+| 7 | CIN | input | Carry input. Carry from a lower-order adder stage; tie to GND when the SN74HC283 is used as the least-significant slice of a wider adder. |+| 8 | GND | power_in | Ground reference (0 V) for logic and supply currents. |+| 9 | COUT | output | Carry output. Carry generated from the four-bit addition; connects to the CIN of the next higher-order adder stage for cascaded expansion. |+| 10 | S3 | output | Sum bit 3 (most-significant) output. Bit 3 of the 4-bit binary sum of the A and B operands including the carry-in. |+| 11 | B3 | input | Bit 3 (most-significant) of the B operand (4-bit binary addend). CMOS logic input. |+| 12 | A3 | input | Bit 3 (most-significant) of the A operand (4-bit binary augend). CMOS logic input. |+| 13 | S2 | output | Sum bit 2 output. Bit 2 of the 4-bit binary sum of the A and B operands including the carry-in. |+| 14 | A2 | input | Bit 2 of the A operand (4-bit binary augend). CMOS logic input. |+| 15 | B2 | input | Bit 2 of the B operand (4-bit binary addend). CMOS logic input. |+| 16 | VCC | power_in | Positive supply voltage. HC types: 2 V to 6 V. HCT types: 4.5 V to 5.5 V. Bypass with a 0.1 uF ceramic capacitor to GND close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 4-bit binary full adder |+| Adds | two 4-bit words + carry-in |+| Outputs | 4-bit sum (S0-S3) + carry-out |+| Carry | internal look-ahead (fast) |+| Cascade | COUT to next CIN |+| Logic family | HC (high-speed CMOS) |+| Supply voltage | 2-6 V |+| Package | SOIC-16 |++## Ordering variants++- `CD74HC283M (SOIC-16, tube)`+- `CD74HC283M96 (SOIC-16, tape & reel)`++## CAD (KiCad official)++- Symbol: `74xx:74LS283 (pin-compatible with 74HC283)`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/cd74hc283.pdf) (20 pp, sha256 `3e7d71c958d64074`, 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/sn74hc283-datasheet.pdf)

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