www.austriamicrosystems.com

Revision 2.1

3 - 19

AS1108

Data Sheet

5 Electrical Characteristics

Note: See Figure 9 on page 6 for additional timing information.

Table 2. Electrical Characteristics

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Operating Supply Voltage

2.7

5.0

5.5

V

Shutdown Supply Current

10

µA

Operating Supply Current

1

mA

All segments and decimal point

330

Display Scan Rate

4 digits scanned

1000

1600 2600

Hz

Digit Drive Sink Current

320

mA

Segment Drive Source Current

-30-40

-45mA

Segment Drive Current Matching

3.0

%

Digit Drive Source Current

-2

mA

Segment Drive Sink Current

5mA

Slow Segment Blink Period (ON

phase, Internal Oscillator)

0.64

1

1.65

s

Fast Segment Blink Period

(ON phase, Internal Oscillator)

0.32

0.5

0.83

s

Fast or Slow Segment Blink Duty

Cycle (Guaranteed by design)

49.9

50

50.1

%

Table 3. Logic Inputs/Outputs Characteristics

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Input Current DIN, CLK, LOAD/CSN

-1

1

µA

Logic High Input Voltage

V

Logic Low Input Voltage

0.8

V

0.6

Output High Voltage

V

Output Low Voltage

0.4

V

Hysteresis Voltage

DIN, CLK, LOAD/CSN

1

V

Table 4. Timing Characteristics

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

CLK Clock Period

100

ns

CLK Pulse Width High

50

ns

CLK Pulse Width Low

50

ns

CSMFall-to-CLK Rise Setup Time

(AS1108 SPI-programmed)

25

ns

CLK Rise-to -LOAD/CSN Rise Hold Time

0ns

DIN Setup Time

25

ns

DIN Hold Time

0ns

Output Data Propagation Delay

25

ns

LOAD Rising Edge-to-Next Clock Rising Edge

50

ns

Minimum LOAD/CSN Pulse High

50

ns

Data-to-Segment Delay

2.25

ms