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SLUS223C – APRIL 1997 – REVISED JUNE 2007
THERMAL CHARACTERISTICS
over operating free-air temperature range (unless otherwise noted)
PACKAGE
DIL-8
SOIC-8
SOIC-14
CFP-14
PLCC-20
(1)
(2)
J
N
D8
D14
W
Q
θ
JC
28
(1)
25
42
35
5.49°C/W
34
θ
JA
125-160
110
(2)
84-160
(2)
50-120
(2)
175.4C/W
43-75
(2)
θ
JC
data values stated were derived from MIL-STD-1835B.
Specified
θ
JA
(junction to ambient) is for devices mounted to 5 in
2
FR4 PC board with one ounce copper where noted. When resistance
range is given, lower values are for 5 in
2
. Test PWB was 0.062 in thick and typically used 0.635-mm trace widths for power packages
and 1.3-mm trace widths for non-power packages with 100 x 100-mil probe land area at the end of each trace.
DISSIPATION RATINGS
PACKAGE
W
T
A
≤
25°C
POWER RATING
700 mW
DERATING FACTOR
ABOVE T
A
≤
25°C
5.5 mW/°C
T
A
≤
70°C
POWER RATING
452 mW
T
A
≤
85°CPO
WER RATING
370 mW
T
A
≤
125°C
POWER RATING
150 mW
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, these specifications apply for –55°C
≤
T
A
≤
125°C for the UC184X; –40°C
≤
T
A
≤
85°C for the
UC284X; 0°C
≤
T
A
≤
70°C for the 384X; V
CC
= 15 V
(1)
; R
T
= 10 kΩ; C
T
= 3.3 nF, T
A
= T
J
.
PARAMETER
REFERENCE SECTION
Output Voltage
Line Regulation
Load Regulation
Temp. Stability
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit
OSCILLATOR SECTION
Initial Accuracy
Voltage Stability
Temp. Stability
Amplitude
(1)
(2)
(3)
T
J
= 25°C
(4)
12
≤
V
CC
≤
25 V
T
MIN
≤
T
A
≤
T
MAX
(2)
(2)
TEST CONDITIONS
UC1842/3/4/5
UC2842/3/4/5
MIN
TYP
5.00
6
6
0.2
MAX
5.05
20
25
0.4
5.1
50
5
–30
47
–100
52
0.2%
5%
1.7
25
–180
57
1%
UC3842/3/4/5
MIN
4.90
TYP
5.00
6
6
0.2
4.82
50
5
–30
47
–100
52
0.2%
5%
1.7
25
–180
57
1%
MAX
5.10
20
25
0.4
5.18
UNIT
T
J
= 25°C, I
O
= 1 mA
12
≤
V
IN
≤
25 V
1
≤
I
0
≤
20 mA
See
(2) (3)
(2)
4.95
V
mV
mV/°C
V
µV
mV
mA
kHz
Line, load, tempature
T
A
= 125°C, 1000
4.9
10 Hz≤ f
≤
10 kHz, T
J
= 25°C
(2)
Hrs
(2)
V
PIN
4 peak-to-peak
V
(4)
Adjust V
CC
above the start threshold before setting at 15 V.
These parameters, although specified, are not 100% tested in production.
Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
V
(max)
*
VREF (min)
Temp Stability
+
REF
TJ(max)
*
TJ (min)
V
REF(max)
and V
REF(min)
are the maximum and minimum reference voltages measured over
the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature.
Output frequency equals oscillator frequency for the UC1842 and UC1843.
Output frequency is one half oscillator frequency for the UC1844 and UC1845.
3
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