www.ams.com/LED-Driver-ICs/AS1109

Revision 1.21

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AS1109

Datasheet - Electrical Character i s t ics

6.1 Switching Characteristics

VDD = 3.0 to 5.5V, VDS = 0.8V, VIH = VDD, VIL = GND, REXT = 372

Ω, VLOAD = 4.0V, RLOAD = 64Ω, CLOAD = 10pF; guaranteed by design.

* If multiple AS1109 devices are cascaded and t

r

or tf is large, it may be critical to achieve the timing required for data transfer between two

cascaded LED drivers.

Note:

All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality

Control) methods.

IDD(OFF)0

Supply Current

Off

REXT = Open‚ OUTN0:7 = Off

1.3

2

mA

IDD(OFF)1

REXT = 744

Ω‚ OUTN0:7 = Off

3.0

3.68

IDD(OFF)2

REXT = 372

Ω‚ OUTN0:7 = Off

4.7

5.37

IDD(OFF)3

REXT = 186

Ω, OUTN0:7 = Off

8.1

8.73

IDD(ON)1

On

REXT = 744

Ω‚ OUTN0:7 = On

4.5

5

IDD(ON)2

REXT = 372

Ω‚ OUTN0:7 = On

7.5

8

IDD(ON)3

REXT = 186

Ω‚ OUTN0:7 = On

13.7

15

Table 4. Switching Characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

tP1

Propagation Delay Time

CLK - SDO

5

10

ns

tP2

Propagation Delay Time (Without Staggered

Output Delay)

LD - OUTNn

100

200

tP3

OEN - OUTNn

100

200

tP4

Propagation Delay Time

10

ns

tW(CLK)

Pulse Width

CLK

15

ns

tW(L)

LD

15

tW(OE)

OEN (@IOUT < 60mA)

200

tR

*

Maximum CLK Rise Time

500

ns

tF

*

Maximum CLK Fall Time

500

ns

tOR

Output Rise Time of VOUT (Turn Off)

100

200

ns

tOF

Output Fall Time of VOUT (Turn On)

100

300

ns

tSU(D)

Setup Time for SDI

5

ns

tH(D)

Hold Time for SDI

5

ns

tSU(L)

Setup Time for LD

5

ns

tH(L)

Hold Time for LD

5

ns

tTESTING

Minimum OEN Time for Error Detection

2000

ns

tSTAG

Staggered Output Delay

20

40

ns

tSU(OE)

Output Enable Setup Time

20

ns

tGSW(ERROR)

Global Error Switching Setup Time

10

ns

tSU(ERROR)

Global Error Detection Setup Time

10

ns

tP(I/O)

Propagation Delay Global Error Flag

5

ns

tSW(ERROR)

Switching Time Global Error Flag

10

ns

fCLK

Maximum Clock Frequency

(Cascade Operation)

30

50

MHz

tP3,ON

Low-Current Test Mode

Propagation Delay Time

Turn ON

3

5

µs

tTP3,OFF

Turn OFF

0.05

0.1

µs

tREXT2,1

External Resistor Reaction Time

Change from REXT1 = 372

Ω, IOUT1

= 50.52mA to REXT2 = 37.2k

Ω,

IOUT2 < 1mA

0.5

1

µs

tREXT2,1

External Resistor Reaction Time

Change from REXT1 = 37.2k

Ω,

IOUT1 = 0.5mA to REXT2 = 372

Ω,

IOUT2 > 25mA

0.5

1

µs

Table 3. Electrical Characteristics (Continued)

Symbol

Parameter

Condition

Min

Typ

Max

Unit