Latches Chapter 14 Subject: Digital System Year: 2009.

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Presentation transcript:

Latches Chapter 14 Subject: Digital System Year: 2009

3 Overview Using logic gates to construct basic latches Explain the different between an S-R Latch and D Latch

Latches The latch is a type of temporary storage device that has two stable states (bistable) and is normally placed in a category separate from that of flip-flops. Latches are similar to flip-flops because they are bistable devices that can reside in either of two states using a feedback arrangement, in which the outputs are connected back to the opposite inputs. The main difference between latches and flip-flops is in the method used for changing their state. Bina Nusantara University 4

S-R (Set-Reset) Latches Bina Nusantara University 5

S-R (Set-Reset) Latches Bina Nusantara University 6

S-R (Set-Reset) Latches Bina Nusantara University 7

74LS279 Bina Nusantara University 8

Application Bina Nusantara University 9

The Gated S-R Latch Bina Nusantara University 10

The Gated D Latch Bina Nusantara University 11