1. General description

The 74HC238; 74HCT238 decodes three binary weighted address inputs (A0, A1 and A2) to eight

mutually exclusive outputs (Y0 to Y7). The device features three enable inputs (E1 and E2 and

E3). Every output will be LOW unless E1 and E2 are LOW and E3 is HIGH. This multiple enable

function allows easy parallel expansion to a 1-of-32 (5 to 32 lines) decoder with just four '238 ICs

and one inverter. The '238 can be used as an eight output demultiplexer by using one of the active

LOW enable inputs as the data input and the remaining enable inputs as strobes. Inputs include

clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in

excess of VCC.

2. Features and benefits

• Wide supply voltage range from 2.0 to 6.0 V

• CMOS low power dissipation

• High noise immunity

• Demultiplexing capability

• Multiple input enable for easy expansion

• Ideal for memory chip select decoding

• Active HIGH mutually exclusive outputs

• Input levels:

• For 74HC238: CMOS level

• For 74HCT238: TTL level

• Complies with JEDEC standards

• JESD8C (2.7 V to 3.6 V)

• JESD7A (2.0 V to 6.0 V)

• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

• ESD protection:

• HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

• Multiple package options

• Specified from -40 °C to +85 °C and from -40 °C to +125 °C

74HCT238属于集成电路（IC） > 信号开关，多路复用器，解码器。安世半导体(中国)有限公司制造生产的74HCT238信号开关，多路复用器，解码器逻辑型信号开关、多路复用器和编码器 IC 可用于对以数字格式表示数据的电信号进行路由和选择。这些器件与设计用于模拟信号的类似产品有所不同，它们保留的信息表示为两个电状态之一，而不是两个外部界限内的无穷变化量。