SM5839AV Ver la hoja de datos (PDF) - Nippon Precision Circuits

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SM5839AV

High-Speed Variable-Length Shift Register

Nippon Precision Circuits  

SM5839A

FUNCTIONAL DESCRIPTION

Initialization

After power is first applied, up to a maximum of 128

input data cycles are considered invalid. However,

any cycle that momentarily sets the register length to

2 steps (by setting S1 to S6 all LOW) and then to the

desired value is considered to be the first valid cycle.

Resister Length Select

The S0 to S6 inputs set the register length (L) to the

decimal-value given by the following equation using

positive logic (HIGH = 1 and LOW = 0).

L = 64 ⋅ (S6) + 32 ⋅ (S5) + 16 ⋅ (S4) + 8 ⋅ (S3) +

4 ⋅ (S2) + 2 ⋅ (S1) + (S0) + 1

Clock and Output Control

ENRC

×

×

H

L

Input

CLK

×

×

L→H

L→H

Output

Shift register

OE

DOUT0 to DOUT7

L

–

High impedance

H

–

Enabled

×

Circulating

–

× Non-circulating

–

Length

128

127

126

125

↓

66

65

64

↓

3

2

S6 S5 S4 S3 S2 S1 S0

1111111

1111110

1111101

1111100

↓↓↓↓↓↓↓

1000001

1000000

0111111

↓↓↓↓↓↓↓

0000010

000000×

NIPPON PRECISION CIRCUITS—7

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