www.ams.com/LED-Driver-ICs/AS1105 Revision 1.36 4 - 15
AS1105
Datasheet - Electrical Characteristics
6 Electrical Characteristics
VDD = 5V, RSET = 9.53kΩ±1%, T
A
= T
MIN
to T
MAX
, unless otherwise noted
.
Table 3. Electrical Characteristics
Symbol Parameter Conditions Min Typ Max Units
VDD Operating Supply Voltage 4.0 5.0 5.5 V
I
DDSD
Shutdown Supply Current
All digital inputs at VDD or GND,
T
A
= +25ºC
20 50 µA
I
DD
Operating Supply Current
R
SET = open circuit 500 µA
All segments and decimal point on,
I
SEG
= -40mA
330 mA
fOSC
Display Scan Rate 500 800 1300 Hz
IDIGIT
Digit Drive Sink Current VOUT = 0.65V 320 mA
I
SEG
Segment Drive Source Current
T
A
= +25ºC, VOUT = (VDD -1V)
-30 -40 -45 mA
ΔI
SEG
Segment Drive Current Matching 3.0 %
IDIGIT
Digit Drive Source Current Digit off, VDIGIT = (VDD -0.3V) -2 mA
I
SEG
Segment Drive Sink Current Segment off, VSEG = 0.3V 5 mA
Logic Inputs
I
IH
, I
IL
Input Current DIN, CLK, LOAD VIN = 0V or VDD -1 1 µA
V
IH
Logic High Input Voltage 3.5 V
V
IL
Logic Low Input Voltage 0.8 V
V
OH
Output High Voltage DOUT, ISOURCE = -1mA VDD - 1 V
V
OL
Output Low Voltage DOUT, ISINK = 1.6mA 0.4 V
Hysteresis Voltage DIN, CLK, LOAD 1 V
Timing Characteristics
t
CP
CLK Clock Period 100 ns
t
CH
CLK Pulse Width High 50 ns
t
CL
CLK Pulse Width Low 50 ns
t
CSH
CLK Rise to LOAD Rise Hold Time 0 ns
t
DS
DIN Setup Time 25 ns
t
DH
DIN Hold Time 0 ns
t
DO
Output Data Propagation Delay
C
LOAD
= 50pF
25 ns
t
LDCK
LOAD Rising Edge to Next Clock
Rising Edge
50 ns
t
CSW
Minimum LOAD Pulse High 50 ns
t
DSPD
Data-to-Segment Delay 2.25 ms
