High Speed CMOS Logic Octal D-Type Flip-Flops with Reset

High Speed CMOS Logic Octal D-Type Flip-Flops with Reset - CD54HCT273


The ’HC273 and ’HCT273 high speed octal D-Type flip-flops with a direct clear input are manufactured with silicon-gate CMOS technology. They possess the low power consumption of standard CMOS integrated circuits.

Information at the D inputis transferred to the Q outputs on the positive-going edge of the clock pulse. All eight flip-flops are controlled by a common clock (CP) and a common reset (MR). Resetting is accomplished by a low voltage level independent of the clock. All eight Q outputs are reset to a logic 0.


  • Common Clock and Asynchronous Master Reset
  • Positive Edge Triggering
  • Buffered Inputs
  • 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

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Parametrics Compare all products in Flip-Flop/Latch/Registers

Technology Family
VCC (Min) (V)
VCC (Max) (V)
Bits (#)
F @ Nom Voltage (Max) (Mhz)
ICC @ Nom Voltage (Max) (mA)
tpd @ Nom Voltage (Max) (ns)
Input Type
3-State Output
Output Drive (IOL/IOH) (Max) (mA)
Output Type
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
CD54HCT273 CD74HCT273
HCT    HCT   
4.5    4.5   
5.5    5.5   
8    8   
25    25   
0.08    0.08   
38    38   
TTL    TTL   
No    No   
4/-4    4/-4   
Military    Catalog   
-55 to 125    -55 to 125   
See datasheet (CDIP)    See datasheet (PDIP)
20SOIC: 132 mm2: 10.3 x 12.8(SOIC)   

Other qualified versions of CD54HCT273

Version Part Number Definition
Catalog CD74HCT273 TI's standard catalog product