MP7542JS データシートの表示（PDF） - Exar Corporation

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MP7542JS

5 V CMOS 4-Bit Input, 12-Bit Digital-to-Analog Converter

Exar Corporation 

MP7542

A0 - A1

CS

WR

DB3 - DB0

VINH

VINL

VINH

VINL

ADDRESS BUS VALID

tAWS1

tCWS1

tAWS2

tWR

tAWH

tCWH

tCWS2

tDS

tDH

VINH

VINL

DATA

BUS VALID

Figure 1. Timing Diagram

MP7542 Control Inputs

A1

A0

CS

WR CLR

X

X

X

X

X

1

0

0

0

0

0

0

1

0

1

0

1

0

1

0

0

1

1

0

1

1

0

X

0

1

1

0

1

1

0

1

1

0

1

1

0

1

0

1

MP7542 Operation

Resets DAC 12-bit register to code 0000 0000 0000

No operation; device not selected

Load LOW byte data register on edges as shown

Load MIDDLE byte data register on edges as shown

Load HIGH byte data register on edges as shown

Load applicable

data register

with data at

D0 - D3

Load 12-bit DAC register with data in LOW byte, MIDDLE

byte, & HIGH byte data registers

NOTES

1. 1 indicates logic HIGH

2. 0 indicates logic LOW

3. X indicates don’t care

4. indicates LOW to HIGH transition

5. MSB XXXX XXXX XXXX LSB

high middle low

byte byte byte

6. Although positive-going edge of either CS or WR will load data register, timing is optimized by using WR to

latch data and using CS as a device enable.

Rev. 2.00

Table 1. Truth Table

5

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