SM5839AP datasheet(7/8 Pages) NPC

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SM5839A

NIPPON PRECISION CIRCUITS—7

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) +

⋅ (S2) + 2 ⋅ (S1) + (S0) + 1

Clock and Output Control

Length

128

1111111

127

1111110

126

1111101

125

1111100

↓

↓↓↓↓↓↓↓

1000001

1000000

0111111

↓

↓↓↓↓↓↓↓

0000010

000000

Input

Shift register

Output

ENRC

CLK

DOUT0 to DOUT7

××

–

High impedance

××

–

Enabled

→ H

Circulating

–

→ H

Non-circulating

–

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