The 74HCT574D from NXP is an octal edge-triggered D-type flip-flop with 3-state outputs and HCT (TTL-compatible) input levels in SOIC-20 for bus interface latching.
| 包装 | SOIC-20 (12.8×7.5mm) |
The 74HCT574D from NXP is an octal edge-triggered D-type flip-flop with 3-state outputs and HCT (TTL-compatible) input levels in SOIC-20 for bus interface latching.
The 74HCT574D is an octal D-type edge-triggered flip-flop with 3-state outputs from Nexperia/NXP in SOIC-20, part of the 74HCT (High-Speed CMOS with TTL-compatible inputs) family. On each rising edge of CLK, the 8 bits present on D0-D7 are latched into the internal registers and appear on Q0-Q7. The OE (Output Enable) pin controls the output state: when OE is LOW, the Q0-Q7 outputs are active (driving HIGH or LOW); when OE is HIGH, all outputs are in the high-impedance (high-Z) state. This 3-state capability allows multiple 74HCT574 devices to share a common data bus, with only one device enabled at a time. The HCT variant has TTL-compatible input thresholds (VIH = 2.0V, VIL = 0.8V at 4.5V supply), allowing it to receive signals from 5V TTL logic while being powered at 5V. The HC variant has CMOS thresholds (approximately 50% of VCC). The maximum clock frequency is 74MHz at 5V, and propagation delay from CLK to Q is 12ns. The device is commonly used for: (1) Address/data bus latching in microprocessor systems; (2) Output port expansion – writing data to the flip-flop via CLK and keeping it on the outputs; (3) Bus buffering – isolating a high-impedance bus from a driving source. The 574 variant has non-inverting outputs (vs 564 which inverts) and edge-triggered (vs 373 which is transparent latch). The -D suffix specifies SOIC-20.
| 针脚 | 名称 | 类型 | 功能 |
|---|---|---|---|
| 1 | OE | 输入 | Output enable (active LOW, HIGH=high-impedance outputs) |
| 2-9 | D0-D7 | 输入 | Data inputs (latched on CLK rising edge) |
| 10 | 接地 | 电源 | 地面 |
| 11 | CLK | 输入 | Clock input (rising edge latches D0-D7 to Q0-Q7) |
| 12-19 | Q7-Q0 | 输出 | Data outputs (3-state, controlled by OE) |
| 20 | VCC | 电源 | Supply (4.5-5.5V, HCT requires 5V system) |
| 制造商 | 部件编号 | 包装 | 说明 |
|---|---|---|---|
| 恩智浦 | 74HCT574D | SOIC-20 | Same device, NXP brand |
| 德州仪器 | SN74HCT574N | DIP-20 | Same function, DIP package |
| onsemi | MC74HCT574ADWG | SOIC-20 | Same function, onsemi brand |
| 德州仪器 | SN74HC574APWR | TSSOP-20 | HC version, 2.0-6.0V supply |
| 恩智浦 | 74LVC574APW | TSSOP-20 | LVC version, 1.65-3.6V supply |
品牌:
封装:
货运周期：3~7 天
最低订购量为 1
品牌:
封装:
货运周期：3~7 天
最低订购量为 1
品牌:
封装:
货运周期：3~7 天
最低订购量为 1
货运周期：3~7 天
最低订购量为 1
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