MAXIM DS4302 Technical data

General Description

The DS4302 is a 5-bit digital-to-analog converter (DAC)
with three programmable digital outputs. The DS4302
communicates through a 2-wire, SMBus™-compatible,
serial interface. The tiny 8-pin µSOP package is ideal
for use in space-constrained applications.

Applications

CCFL Backlight Brightness Control

Power-Supply Calibration

Features

♦ SO Package is a Drop-In Replacement for the

MPS1251 and MPS1252

♦ Single 5-Bit DAC (32 Steps)

♦ 0V to 2V and 0V to 1.9V Versions

♦ Three Programmable Digital Outputs

♦ SMBus-Compatible Serial Interface

♦ 4.5V to 5.5V Supply Voltage Range

♦ 8-Pin SO and 8-Pin µSOP Packages

♦ Industrial Temperature Range: -40°C to +85°C

DS4302

2-Wire, 5-Bit DAC with Three Digital Outputs

______________________________________________ Maxim Integrated Products 1

TOP VIEW

P1

P2GND

1

2

87V

CC

P0SDA

V

OUT

SCL

SO/µSOP

3

4

6

5

DS4302

Pin Configuration

Ordering Information

Rev 1; 6/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Add “/T&R” for tape-and-reel orders.
*Contact factory for availability.

SMBus is a trademark of Intel Corp.

PART

V

OUT

RANGE

TOP

BRAND

PIN-

PACKAGE

DS4302Z-020

4302B 8 SO

DS4302Z-019*

4302A 8 SO

DS4302U-020

4302B 8 µSOP

DS4302U-019*

4302A 8 µSOP

Pin Description

PIN

FUNCTION

1 SCL Serial Clock Input. 2-wire clock input.

2 SDA

Serial Data Input/Output. Bidirectional,
2-wire data pin.

3V

OUT

DAC Output Voltage

4 GND Ground

5P2

6P1

7P0

Programmable Digital Output

8VCCPower-Supply Input

查询DS4302供应商

0V to 2.0V

0V to 1.9V

0V to 2.0V

0V to 1.9V

NAME

DS4302

2-Wire, 5-Bit DAC with Three Digital Outputs

2 _____________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED DC OPERATING CONDITIONS

(TA= -40°C to +85°C)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Voltage Range on VCC, SDA, and SCL Pins

Relative to Ground.............................................-0.5V to +6.0V

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-55°C to +125°C

Soldering Temperature.....See IPC/JEDEC J-STD-020A Specification

PARAMETER

CONDITIONS

UNITS

Supply Voltage V

CC

(Note 1) 4.5 5.5 V

Input Logic 1 (SDA, SCL) V

IH

2.0

V

Input Logic 0 (SDA, SCL) V

IL

0.8 V

DC ELECTRICAL CHARACTERISTICS

(VCC= +4.5V to 5.5V, TA= -40°C to +85°C.)

X = Don’t care.

SYMBOL

Standby Current I

Input Leakage I

SDA Low-Level Output Voltage V

P0, P1, P2 Low-Level Output
Voltage

P0, P1, P2 High-Level Output
Voltage

V

OUT

V

OUT

V

OUT

V

OUT

Power-On Reset 1.7 V

Settling Time 10 µs

D/A Output Levels 32 steps

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

STBY

OL1

V

OL2

V

OH

Maximum Level (-020) VCC = 5.0V, Data = 00000XXX (Note 3) 1.925 2.0 2.075 V

Minimum Level (-020) VCC = 5.0V, Data = 11111XXX 0.0 0.05 0.1 V

Maximum Level (-019) VCC = 5.0V, Data = 00000XXX (Note 3) 1.825 1.9 1.975 V

Minimum Level (-019) VCC = 5.0V, Data = 11111XXX 0.0 0.05 0.1 V

(Notes 2, 3) 200 300 µA

(Note 4) -1.0 +1.0 µA

L

3mA sink current 0.0 0.4

6mA sink current 0.0 0.6

(Note 1)
4mA sink

(Note 1)
4mA source

MIN TYP MAX

V

+ 0.3

CC

GND - 0.3

+0.4V V

- 0.4V V

V

CC

V

DS4302

2-Wire, 5-Bit DAC with Three Digital Outputs

_____________________________________________________________________ 3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SCL Clock Frequency f

SCL

0 400 kHz

Bus Free Time Between STOP
and START Conditions

t

BUF

1.3 µs

Low Period of SCL t

LOW

1.3 µs

High Period of SCL t

HIGH

0.6 µs

Data Hold Time

0 0.9 µs

Data Setup Time

100 ns

Start Setup Time t

SU:STA

0.6 µs

SDA and SCL Rise Time t

R

(Note 5)

300 ns

SDA and SCL Fall Time t

F

(Note 5)

300 ns

Stop Setup Time

0.6 µs

SDA and SCL Capacitive
Loading

C

B

(Note 5) 400 pF

AC ELECTRICAL CHARACTERISTICS (Figure 3)

(VCC= +4.5V to 5.5V, TA= -40°C to +85°C, timing referenced to V

IL(MAX)

and V

IH(MIN)

.)

Note 1: All voltages referenced to ground.
Note 2: I

STBY

specified for the inactive state measured with SDA = SCL = VCCand with V

OUT

, P0, P1, and P2 floating.

Note 3: No load on V

OUT

.

Note 4: The DS4302 will not obstruct the SDA and SCL lines if V

CC

is switched off as long as the voltages applied to these inputs

does not violate their min and max input-voltage levels.

Note 5: C

B

—total capacitance of one bus line in picofarads.

t

HD:DAT

t

SU:DAT

t

SU:STO

20 + 0.1C

20 + 0.1C

B

B