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74HC21 Dual 4-input AND gate PHILIPS

74HC21 瑞斯特（RST）74HC21是一款双路4输入与门，在14引脚封装内集成了两个独立的4输入与门逻辑单元，其中两个引脚为未连接（NC）状态。该器件支持2.0 V至6.0 V的宽工作电压范围，输入引脚均集成钳位二极管，允许通过限流电阻安全接收超过VCC电压的外部信号。 RSTTEK

74HC221 Dual non-retriggerable monostable multivibrator with reset PHILIPS

74HC221D Dual non-retriggerable monostable multivibrator with reset PHILIPS

74HC221N Dual non-retriggerable monostable multivibrator with reset PHILIPS

74HC237 3-to-8 line decoder/demultiplexer with address latches PHILIPS

74HC237 3-to-8 line decoder, demultiplexer with address latches PHILIPS

74HC237 3-to-8 line decoder, demultiplexer with address latches NXP

74HC237D 3-to-8 line decoder, demultiplexer with address latches PHILIPS

74HC237D 3-to-8 line decoder/demultiplexer with address latches PHILIPS

74HC237D 3-to-8 line decoder, demultiplexer with address latches NXP

74HC237DB 3-to-8 line decoder, demultiplexer with address latches PHILIPS

74HC237DB 3-to-8 line decoder/demultiplexer with address latches PHILIPS

74HC237DB 3-to-8 line decoder, demultiplexer with address latches NXP

74HC237N 3-to-8 line decoder, demultiplexer with address latches PHILIPS

74HC237N 3-to-8 line decoder/demultiplexer with address latches PHILIPS

74HC237N 3-to-8 line decoder, demultiplexer with address latches NXP

74HC237_10 3-to-8 line decoder, demultiplexer with address latches NXP

74HC237_11 3-to-8 line decoder, demultiplexer with address latches NXP

74HC238 3-to-8 line decoder/demultiplexer PHILIPS