8

Data Sheet

AS2590

Rev. 1

Dec. 1993

SDA/SCL

Serial Interface

Fig. 5

f

CL

Clock Frequency

10

kHz

f

CLH

Clock High Time

50

µs

f

CLL

Clock Low Time

50

µs

f

CD

Clock Low to Data Change

20

t

CLL

ns

f

SOH

Stop Bit High Time

50

µs

f

SOL

Stop Bit Low Time

50

µs

f

HD

Data Hold Time

200

ns

f

SUSO

Clock Setup for Stop

200

ns

f

HSA

Clock Hold for Start

200

ns

f

GAP

Data High between 2 Words

100

µs

BP0…3

Back Plane Outputs

Figure 6, note 1

t

BRON

Rise Time, on

20

µs

t

BFON

Fall Time, on

20

µs

t

BROF

Rise Time, off

20

µs

t

BFOF

Fall Time, off

20

µs

t

BC

Cycle Frequency

128

Hz

S0…32

Segment Outputs

Figure 7, note 2

t

SRON

Rise Time, on

20

µs

t

SFON

Fall Time, on

20

µs

t

SROF

Rise Time, off

20

µs

t

SFOF

Fall Time, off

20

µs

t

SC

Cycle Frequency

128

Hz

t

TIMER

Timer Display Time

Note 3

5

6

sec

t

XUP

Oscillator Startup Time

R

300

ms

AC Characteristics (V

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Note 1: Loads on backplanes = 3 000 pF//10 M

Ω

Note 2: Loads on segments = 360 pF//1 M

Ω

Note 3: After BLANK ALL command and timer has been started with a valid start command, timer content is displayed.