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74HCT245D
SOIC-20 (12.8x7.5mm)
The 74HCT245D from NXP is an octal bidirectional bus transceiver with 3-state outputs, direction control, and HCT TTL-compatible inputs in SOIC-20 for bus driving and isolation.
| Paquete | SOIC-20 (12.8×7.5mm) |
The 74HCT245D from NXP is an octal bidirectional bus transceiver with 3-state outputs, direction control, and HCT TTL-compatible inputs in SOIC-20 for bus driving and isolation.
The 74HCT245D is an octal bus transceiver with 3-state outputs from Nexperia/NXP in SOIC-20, part of the 74HCT family. It provides bidirectional communication between two 8-bit buses (A1-A8 and B1-B8) controlled by two pins: DIR and OE. When DIR is HIGH, data flows from A to B (A pins are inputs, B pins are outputs). When DIR is LOW, data flows from B to A (B pins are inputs, A pins are outputs). When OE is HIGH, both buses are in the high-impedance state regardless of DIR. This allows multiple 74HCT245 devices to share a common bus, with only one driving at a time. The device is the workhorse of microprocessor bus systems: it isolates the CPU data bus from peripheral devices, buffers address/data lines, and provides level translation between 5V TTL and CMOS systems. The HCT variant has TTL-compatible input thresholds (VIH=2.0V, VIL=0.8V at 4.5V), allowing it to receive signals from both TTL and CMOS sources. The maximum propagation delay is 11ns at 5V, and the output can source/sink 6mA. The device is commonly used in: (1) Microprocessor bus buffering and isolation; (2) Level translation between 5V and 3.3V systems (HCT can receive 3.3V logic as valid HIGH); (3) Bidirectional I/O port expansion; (4) Hot-swap isolation (OE=HIGH disconnects the bus during card insertion). The -D suffix specifies SOIC-20.
| Pin | Nombre | Tipo | Función |
|---|---|---|---|
| 1 | DIR | Entrada | Direction control (HIGH=A-to-B, LOW=B-to-A) |
| 2-9 | A1-A8 | E/S | Bus A (bidirectional, controlled by DIR and OE) |
| 10 | GND | Potencia | Suelo |
| 11-18 | B8-B1 | E/S | Bus B (bidirectional, controlled by DIR and OE) |
| 19 | OE | Entrada | Output enable (active LOW, HIGH=high-impedance both buses) |
| 20 | VCC | Potencia | Supply (4.5-5.5V, HCT requires 5V system) |
| Fabricante | Número de pieza | Paquete | Notas |
|---|---|---|---|
| NXP | 74HCT245D | SOIC-20 | Same device, NXP brand |
| Texas Instruments | SN74HCT245N | DIP-20 | Same function, DIP package |
| onsemi | MC74HCT245ADWG | SOIC-20 | Same function, onsemi brand |
| Texas Instruments | SN74HC245APWR | TSSOP-20 | HC version, 2.0-6.0V supply |
| NXP | 74LVC245APW | TSSOP-20 | LVC version, 1.65-3.6V supply, bidirectional |
Marca:
Paquete:
Ciclo de carga: 3~7 días
El pedido mínimo es de 1
Marca:
Paquete:
Ciclo de carga: 3~7 días
El pedido mínimo es de 1
Marca:
Paquete:
Ciclo de carga: 3~7 días
El pedido mínimo es de 1
Marca:
Paquete:
Ciclo de carga: 3~7 días
El pedido mínimo es de 1
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