MM5450/5451

Micrel

MM5450/5451

4

May 2000

Absolute Maximum Ratings

Voltage (any pin) ...................................... V

Power Dissipation (P

+25

°C ......................................................................... 1W

+85

°C .................................................................. 560mW

Junction Temperature (T

Storage Temperature (T

Lead Temperature (soldering, 10 sec.) ................... +300

°C

Operating Ratings

Supply Voltage (V

Ambient Temperature Range (T

Electrical Characteristics

4.5V

≤ V

Symbol

Parameter

Condition

Min

Typ

Max

Units

Power Supply Current

–25

°C to +85°C, excluding output loads

8.5

mA

–40

°C to +85°C, excluding output loads

10

mA

Data Input Voltage

V

L

logic-0 level,

±10µA input bias

–0.3

0.8

V

V

H

logic-1 level, 4.75V

≤ V

2.2

V

DD

V

V

V

V

DD

V

Brightness Control Input Current

Note 2

0

0.75

mA

Output Sink Current

segment off, V

10

µA

segment on, V

brightness input = 0

µA

010

µA

brightness input = 100

µA

2.0

2.7

4

mA

brightness input = 750

µA

15

25

mA

Brightness Control Input Voltage

input current = 750

µA

3.0

4.3

V

Output Matching

Note 1

%

f

C

Clock Input Frequency

Notes 5, 6

500

kHz

t

H

Clock Input High Time

Notes 5, 6

950

ns

t

L

Clock Input Low Time

Notes 5, 6

950

ns

t

DS

Data Input Setup Time

300

ns

t

DH

Data Input Hold Time

300

ns

t

DES

Data Enable Input Setup Time

100

ns

Reset Pad Current

die

8

µA

Note 1:

Output matching is calculated as the percent variation (I

Note 2:

With a fixed resistor on the brightness input pin, some variation in brightness will occur among devices.

Maximum brightness control input current can be 2mA providing it complies with Note 3 and the junction temperature equation.

Note 3:

See Figures 7, 8 and 9 for recommended operating conditions and limits. Absolute maximum for each output should be limited to 40mA.

Note 4:

V

Note 5:

AC input waveform specification for test purpose: t

Note 6:

Clock input rise and fall times must not exceed 300ns.