SN74ALS576B Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs |


Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs



These octal D-type edge-triggered flip-flops feature 3-state outputs designed specifically for bus driving. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

These flip-flops enter data on the low-to-high transition of the clock (CLK) input.

The output-enable () input does not affect internal operations of the flip-flops. Old data can be retained or new data can be entered while the outputs are disabled.

The SN54ALS576B and SN54AS576 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS576B, SN74ALS577A, and SN74AS576 are characterized for operation from 0°C to 70°C.


  • 3-State Buffer-Type Inverting Outputs Drive Bus Lines Directly
  • Bus-Structured Pinout
  • Buffered Control Inputs
  • SN74ALS577A Has Synchronous Clear
  • Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), Standard Plastic (N, NT) and Ceramic (J) 300-mil DIPs, and Ceramic Flat (W) Packages


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Parametrics Compare all products in D-type flip-flop

Technology Family
VCC (Min) (V)
VCC (Max) (V)
Bits (#)
Voltage (Nom) (V)
F @ nom voltage (Max) (Mhz)
ICC @ nom voltage (Max) (mA)
tpd @ Nom Voltage (Max) (ns)
IOL (Max) (mA)
IOH (Max) (mA)
3-state output
Operating temperature range (C)
ALS     ALS    
4.5     4.5    
5.5     5.5    
8     8    
5     5    
75     75    
30     30    
14     14    
24     24    
-2.6     -2.6    
Yes     Yes    
Catalog     Military    
0 to 70     -55 to 125