7476 IC Dual Master-Slave J-K Flip-Flops
The 7476 is a dual master-slave J-K flip-flop integrated circuit in a 16-pin DIP package. Each of the two flip-flops features separate J and K inputs, a clock input, and asynchronous preset and clear inputs, allowing independent control and initialization. On the rising (or falling, depending on the variant) edge of the clock, the master captures the J/K inputs, while the slave outputs are then updated, preventing race conditions. The outputs include both Q and Q̅ (not-Q), providing complementary signals. Thanks to its master-slave architecture, the 7476 avoids the unstable “race” behavior seen in simpler J-K circuits. This makes it suitable for use in counters, registers, sequential logic circuits, and digital control systems where edge-triggered, bistable storage is needed.
Features
- Contains two independent J-K master-slave flip-flops in a single 16-pin package.
- Provides both Q and Q̅ (complementary outputs) for each flip-flop.
- Equipped with asynchronous preset and clear inputs for direct setting or resetting.
- Operates with edge-triggered clocking to prevent race conditions.
- Compatible with standard TTL logic levels.
- High noise immunity and reliable switching performance.
- Designed with master-slave architecture for stable operation.
- Standard DIP-16 package, easy for prototyping and PCB integration.
- Widely used in counters, registers, shift storage, and sequential logic systems.
Pin Layout
Pin Configuration
| Pin Number | Pin Name | Description |
| 5 | Vcc | Powers the IC typically with 5V |
| 13 | Ground | Connected to the ground of the system |
| JK Flip Flop – 1 / JK Flip Flop – 2 | ||
| 1,6 | Clock-1/ Clock-2 | These pins must be provided with a clock pulse for the flip-flop |
| 2,7 | Preset-1 / Preset-2 | When the Preset is high the flip flop will set Q=1 and not Q=0 |
| 3, 8 | Clear-1/Clear-2 | When Clear is high the flip flop will set Q=0 and not Q=1 |
| 12,16 | K-1/ K-2 | Input pin of the Flip Flop |
| 4,9 | J-1 / J-2 | Another Input pin of the Flip Flop |
| 10,14 | Q-1(bar) / Q-2 (bar) | The inverted output pin of Flip Flop |
| 11,15 | Q-1 / Q-2 | Output Pin of the Flip Flop |
Specifications
| Parameter | Typical Value | Conditions / Notes |
|---|---|---|
| V_CC (supply voltage) | 5.0 V | Nominal operating voltage |
| V_IH (min input HIGH voltage) | 2.0 V | For J, K, Clock, Preset, Clear |
| V_IL (max input LOW voltage) | 0.8 V | Input low level threshold |
| V_OH (min output HIGH voltage) | ~ 2.7–3.5 V | Depends on loading (pull-up, fan-out) |
| V_OL (max output LOW voltage) | ~ 0.2 V | With standard load conditions |
| Propagation delay, t_PLH / t_PHL | ~ 20–50 ns | From Clock to outputs, depending on load |
| Input leakage current (I_I) | ±20 µA | Typical input leakage for J, K, Preset, Clear |
| Operating temperature range | 0 to 70 °C (commercial) | Standard ambient range |
Applications
- Frequency division.
- Binary counters.
- Shift registers.
- Toggle flip-flop applications.
- Digital memory elements.
- State machines.
- Pulse synchronization.
- Debouncing circuits.
- Control circuits.
Package Contents
- 1 x 7476 IC Dual Master-Slave J-K Flip-Flops DIP-16