7400 Series

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Common Used

Name Type Function
74-595 HC/HCT 8-bit shift registers, output latches, three-state parallel outputs
74-245 HC/HCT octal bus transceiver, non-inverting three-state outputs
Example Example Example
  • NXP 74HCT245D
  • TI SN74HCT245DW RG4
  • TOSHIBA 74HCT245D

derivative families

  • HC – High-speed CMOS, similar performance to 74LS, 12 ns. 2.0–6.0 V.
  • HCT – High speed, compatible logic levels to bipolar parts.
Header text LOW Input HIGH Input
HC 1.5V 3.5V
HCT 0.8V 2.0V


系列 电平 典型传输延迟ns 最大驱动电流(-Ioh/Lol)mA
AHC CMOS 8.5 -8/8 Example Example
AHCT COMS/TTL 8.5 -8/8 Example Example
HC COMS 25 -8/8 Example Example
HCT COMS/TTL 25 -8/8 Example Example
ACT COMS/TTL 10 -24/24 Example Example
F TTL 6.5 -15/64 Example Example
ALS TTL 10 -15/64 Example Example
LVC Example Example Example
AC Example Example Example
S Example Example Example
LC Example Example Example


Reference