Dictionary of Electronic Terms
"A"
"B"
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
IC D type Flip Flop Chips
8-Bit Flip Flop Chip
IC 8-Bit Flip Flop Chip. The circuit depicts an 8-bit D-type flip flop with Clear function [Octal D FF].
The active low Clear pin clears the flip flop when low. When high the clear input has no effect on the operation of the flip flop. A clear command sets the Q output low and the Q-bar output high.
Flip Flop by Function:
7474; Dual Positive-Edge-Triggered D-Type Flip-Flops with Set and Reset
74174; Hex D Flip-Flops with Reset
74175; High Speed CMOS Logic Quad D-Type Flip-Flops with Reset
74273; Octal D-Type Flip-Flops with Reset
74377; Octal D-Type Flip-Flops with Data Enable
7411074; Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset
4013; Dual D-Type Flip Flop
4017; Hex D-Type Flip-Flop
40175; Quad D-Type Flip-Flop
Only the generic 7400 family is listed above, just to show the available part types. However there are sub-families available with differing characteristics which change depending on the family. One of the more important characteristics for a flip flop, regardless of the number of devices in a package, is toggle frequency. The maximum frequency [Fmax] is determined by the maximum clock frequency the flip flop can accept and still toggle, or the frequency that causes the flip flop to cease toggling. Note that Fmax changes depending on the logic family used; 74Axx, 74ASxx, 74Hxx and so on [Logic Family Listing]. So a flip flop will operate up to the maximum frequency [Fmax], but that frequency does not include variations in board layout. That is the higher the operating frequency, the closer the clock edge moves toward the edge of the data. Trace or routing delays will also effect the relationship of the clock edge to data edge.
