CDx4AC374, CDx4ACT374, CD74AC534 Octal D-Type Flip-Flops, 3-State Positive-Edge Triggered
1 Features
- SCR-Latch-up-resistant CMOS process and circuit design
- Speed of bipolar FAST*/AS/S with significantly reduced power consumption
- Balanced propagation delays
- AC types feature 1.5V to 5.5V operation and balanced noise immunity at 30% of the supply
- ± 24mA output drive current
- Fanout to 15 FAST* ICs
- Drives 50ohm transmission lines
*. FAST is a Registered Trademark of Fairchild
Semiconductor Corp.
2 Description
The eight flip-flops of the ’AC374 devices are D-type edge-triggered flip-flops. On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels set up at the data (D) inputs.
Device Information
| PART NUMBER | PACKAGE(1) | PACKAGE SIZE(2) | BODY SIZE(3) |
|---|---|---|---|
| CDx4AC/ACT374, CD74AC534 | DW (SOIC, 20) | 12.80mm × 10.3mm | 12.80mm × 7.50mm |
| N (PDIP, 20) | 24.33mm × 9.4mm | 24.33mm × 6.35mm |
(1) For more information, see Section 10.
(2) The package size (length × width)
is a nominal value and includes pins, where applicable.
(3) The body size (length × width) is
a nominal value and does not include pins.
Logic Diagram (Positive Logic)3 Pin Configuration and Functions
Figure 3-1 CDx4AC/ACT374,
CD74AC534 
Figure 3-2 CDx4AC/ACT374,
CD74AC534 Table 3-1 Pin Functions
| PIN | TYPE | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| OE | 1 | I | Enable pin |
| 1Q | 2 | O | Output 1 |
| 1D | 3 | I | Input 1 |
| 2D | 4 | I | Input 2 |
| 2Q | 5 | O | Output 2 |
| 3Q | 6 | O | Output 3 |
| 3D | 7 | I | Input 3 |
| 4D | 8 | I | Input 4 |
| 4Q | 9 | O | Output 4 |
| GND | 10 | – | Ground pin |
| CLK | 11 | I | Clock pin |
| 5Q | 12 | O | Output 5 |
| 5D | 13 | I | Input 5 |
| 6D | 14 | I | Input 6 |
| 6Q | 15 | O | Output 6 |
| 7Q | 16 | O | Output 7 |
| 7D | 17 | I | Input 7 |
| 8D | 18 | I | Input 8 |
| 8Q | 19 | O | Output 8 |
| VCC | 20 | – | Power pin |
