产品描述:
CD74HC137、CD74HCT137、HC237和CD74HCT237是高速硅栅CMOS解码器,非常适合存储器地址解码或数据路由应用。这两种电路都具有低功耗的特点,通常与CMOS电路相关,但其速度可与低功耗肖特基TTL逻辑相媲美。
两个电路都有三个二进制选择输入(A0、A1和A2),可通过有效的高位锁存使能(LE)信号锁存,以将输出与选择输入更改隔离。"低"的LE使输出对输入是透明的,电路起到八选一解码器的作用。提供了两个输出使能输入(OE1和OE0),以简化级联并促进多路分解。解复用功能是通过使用A 0、A 1、A 2输入来选择所需的输出并使用其他输出使能输入之一作为数据输入,同时将另一个输出使能输入保持在其活动状态来实现的。在CD74HC137和CD74HCT137中,所选输出为"低";在CD74HCT237和CD74HCT237中,所选输出为"高"。产品特性:
- Select One of Eight Data Outputs
- Active Low for CD74HC137 and CD74HCT137
- Active High for ’HC237 and CD74HCT237
- I/O Port or Memory Selector
- Two Enable Inputs to Simplify Cascading
- Typical Propagation Delay of 13ns at VCC = 5V, 15pF, TA = 25°C (CD74HC237)
- Fanout (Over Temperature Range)
- Standard Outputs. . . . 10 LSTTL Loads
- Bus Driver Outputs. . . . 15 LSTTL Loads
- Wide Operating Temperature Range . . . –55°C to 125°C
- Balanced Propagation Delay and Transition Times
- Significant Power Reduction Compared to LSTTL Logic ICs
- HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30%, of VCC at VCC = 5V
- HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il 1µA at VOL, VOH
Data sheet acquired from Harris Semiconductor
技术系列HC
通道数量1
温度范围(C)-55to125
等级产品样本
供应电流(Max)(µA)160