VOLTAGE DETECTOR
1
TC54
DESCRIPTION OF OPERATION
TIMING CHART
VIN
+
VDET
VHYST
RELEASE
RESET
OR
VOLTAGE
VOLTAGE
–
DETECT VOLTAGE VDET
MINIMUM OPERATING
VOLTAGE
GROUND LEVEL
OUTPUT VOLTAGE
GROUND LEVEL
Refer to the Timing Chart below. In normal steady-state
–
operation, when V
IN
> V
DET
, the output will be at a logic high.
In the case of the TC54V, this is an open-drain condition. If
–
and when the input falls below V
DET
, the output will pull down
(Logic 0) to V
SS
. Generally, V
OUT
can pull down to within
0.5V of V
SS
at rated output current and input voltage. (See
the Electrical Characteristics section).
The output, V
OUT
, will stay valid until the input voltage
falls below the Minimum Operating Voltage, V
IN
(MIN), of
1.5V. Below this minimum operating voltage, the output is
undefined. During power-up or anytime V
IN
has fallen below
V
IN
(MIN), V
OUT
will remain undefined until V
IN
rises above
V
IN
(MIN), at which time the output will become valid. V
OUT
+
will be in its active low state while V
IN
(MIN) < V
IN
< V
DET
.
–
(V
+
= V
DET
+ V
HYST
). If and when the input rises above
DET
V
+
, the output will assume its inactive state. (High for
DET
TC54VC, open-drain for TC54VN).
2
3
4
5
6
7
APPLICATIONS
Refer to TelCom Semiconductor Application Note #2,
Using the TC54 Voltage Detector.
MARKING
SOT-23A-3
SOT-89-3
TO-92
1 2 3 4
5 6 7 8
9 10 11 12
= output (Nch or CMOS) plus first voltage digit
2 3 4 5 6
Nch
M N P R S
CMOS
C D E F H
D
ex: CMOS 3.x =
kkkk
= first voltage decimal (0-9)
D 4
ex: CMOS 3.4 =
kkkk
&
= assembly lot number
,
&
= 54_ (fixed)
= output (C = CMOS, N = Nch)
= first voltage digit (2-6)
= first voltage decimal (0-9)
= extra feature code : fixed : 0
= detecting accuracy
1 =
±
1.0% (custom), 2 =
±
2.0% (standard)
,
,
&
= assembly lot number
8
TELCOM SEMICONDUCTOR, INC.
4-281
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
