SN74HCT377 Octal D-Type Flip-Flops With Clock Enable |

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Octal D-Type Flip-Flops With Clock Enable

Octal D-Type Flip-Flops With Clock Enable - SN74HCT377


These devices are positive-edge-triggered D-type flip-flops. The ’HCT377 devices are similar to the ’'HCT273 devices, but feature a latched clock-enable (CLKEN)\ input instead of a common clear.

Information at the data (D) inputs meeting the setup time requirements is transferred to the Q outputs on the positive-going edge of the clock (CLK) pulse if CLKEN\ is low. Clock triggering occurs at a particular voltage level and is not directly related to the transition time of the positive-going pulse. When CLK is at either the high or low level, the D input has no effect at the output. These devices are designed to prevent false clocking by transitions at CLKEN\.


  • Operating Voltage Range of 4.5 V to 5.5 V
  • Outputs Can Drive Up To 10 LSTTL Loads
  • Low Power Consumption, 80-&miccro;A Max ICC
  • Typical tpd = 12 ns
  • ±4-mA Output Drive at 5 V
  • Low Input Current of 1 µA Max
  • Inputs Are TTL-Voltage Compatible
  • Contain Eight Flip-Flops With Single-Rail Outputs
  • Clock Enable Latched to Avoid False Clocking
  • Applications Include:
    • Buffer/Storage Registers
    • Shift Registers
    • Pattern Generators


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Part number Order Technology Family Input type Output type VCC (Min) (V) VCC (Max) (V) IOL (Max) (mA) IOH (Max) (mA) Rating Package Group
SN74HCT377 Order now HCT     TTL-Compatible CMOS     Push-Pull     4.5     5.5     4     -4     Catalog     PDIP | 20
SOIC | 20