TRIG/
(Pin 8) The TRIG/ can be turned on or off by applying the active
logic level at either the SENS/ or the EXT input for a brief duration. In
the Off state, the TRIG/ sits at steady high level turning off the triac in
series with the lamp. In the On state, the TRIG/ outputs a low going
pulse once every half cycle of the AC at a conduction angle set by the
voltage at the BCV input.
Upon power up the TRIG/ output defaults to the following
states:
For
LS7642
the TRIG/ is off.
For
LS7642FO
the TRIG/ is on
ABSOLUTE MAXIMUM RATINGS:
PARAMETER
DC supply voltage
Any input voltage
Operating temperature
Storage temperature
SYMBOL
V
DD
- Vss
V
IN
T
A
T
STG
VALUE
+7
Vss - 0.3 to V
DD
+ 0.3
0 to +90
-65 to +150
UNIT
V
V
o
C
o
C
DC ELECTRICAL CHARACTERISTICS:
(T
A
= +25
o
C, all voltages referenced to V
SS
. V
DD
= +5V unless otherwise noted.)
PARAMETER
Supply voltage
Supply current
SYNC
Lo
SYNC
Hi
BCV input:
Dynamic Voltage Range
Voltage increment per step
EXT, SENS/
Lo
EXT, SENS/
Hi
TRIG/
Lo
TRIG/
Hi
TRIG/
Sink Current
SYMBOL
V
DD
I
DD
V
ISL
V
ISH
Vb
∆Vb/∆ø
V
IEL
V
IEH
V
OL
V
OH
I
TSNK
MIN
4.5
-
-
2.9
1.25
-
-
3.5
-
-
35
TYP
5.0
300
-
-
-
39
-
-
0.2
5.0
-
MAX
5.5
400
2.1
-
4.4
-
1.5
-
-
-
-
UNIT
V
µA
V
V
V
mV
V
V
V
V
mA
CONDITION
-
Output unloaded, V
DD
= 5V
-
-
V
DD
= 5V
∆ø
= 1.4
o
, V
DD
= 5V
-
-
-
-
V
OTRIG
= 2.5V
TRANSIENT CHARACTERISTICS
(See Figures 2, 3 and 4):
PARAMETER
SYNC
Frequency
EXT, SENS/
Touch Duration
TRIG/
pulse width (see Note 2)
Conduction Angle
ø incremental steps
(Note 1)
On/Off slew rate
SYMBOL
f
S
T
S1
T
S1
T
W
T
W
ø
∆ø
S
S
S
S
MIN
40
67
80
-
-
45
-
-
-
TYP
-
-
-
130
156
-
1.4
1.4
1.4
MAX
70
infinite
infinite
-
-
159
-
-
-
UNI T
Hz
ms
ms
µs
µs
deg
deg
deg/33.33ms
deg/40ms
CONDITION
-
60Hz
50Hz
60Hz
50Hz
-
-
60Hz
50Hz
Note 1:
Total number of steps = 82.
Note 2:
T
W
= 488us (60Hz), 586us (50Hz) available. Contact factory for details.
7642-042908-2
LSI [ LSI COMPUTER SYSTEMS ]
