MP7542 Exar Corporation, MP7542 Datasheet - Page 5

• Manufacturer Part Number: MP7542
• Description: 5 V CMOS 4-Bit Input 12-Bit Digital-to-Analog Converter
• Manufacturer: Exar Corporation

Rev. 2.00
NOTES
1. 1 indicates logic HIGH
2. 0 indicates logic LOW
3. X indicates don’t care
4.
5. MSB
6. Although positive-going edge of either CS or WR will load data register, timing is optimized by using WR to
A0 - A1
CS
WR
DB3 - DB0
latch data and using CS as a device enable.
A
X
X
0
0
0
0
1
1
1
1
1
indicates LOW to HIGH transition
MP7542 Control Inputs
XXXX
A
X
X
0
0
1
1
0
0
1
1
high
byte
0
CS
XXXX
X
1
0
0
0
0
0
middle
byte
V
V
INH
INL
XXXX
WR
X
1
0
0
0
0
0
low
byte
V
INH
V
INL
CLR
LSB
0
1
1
1
1
1
1
1
1
1
Figure 1. Timing Diagram
Table 1. Truth Table
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 12-bit DAC register with data in LOW byte, MIDDLE
byte, & HIGH byte data registers
t
AWS2
t
CWS2
ADDRESS BUS VALID
t
V
V
AWS1
INH
INL
t
5
CWS1
BUS VALID
t
WR
t
DS
DATA
MP7542 Operation
t
AWH
t
CWH
t
DH
Load applicable
data register
with data at
D
MP7542
0
- D
3