ATTL7554BP 데이터 시트보기 (PDF) - Agere -> LSI Corporation
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ATTL7554BP Datasheet PDF : 28 Pages
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L7554 Low-Power SLIC
Data Sheet
March 1997
Applications (continued)
Characteristic Curves (continued)
25
50
20
40
15
30
1
10 kΩ
ILIM
10
20
–1
RDC1
5
10
0
0
10
20
30
40
50
60
LOOP CLOSURE THRESHOLD RESISTOR, RLCTH (kΩ)
Note: VBAT = –48 V.
Figure 17. Loop Closure Program Resistor
Selection
12-3015 (C)
0
0
10
20
30
40
50
LOOP VOLTAGE (V)
Note: VBAT = –48 V; ILIM = 22 mA; RDC1 = 113 Ω.
12-3050 (C)
Figure 19. Loop Current vs. Loop Voltage
2000
1500
1000
500
50
40
300 cu. ft./ min.
30
36 °C/W
20
STILL AIR
47 °C/W
10
0
20 40 60 80 100 120 140 160 180
AMBIENT TEMPERATURE, TA (°C)
0
0
500
1000
1500
2000
LOOP R ESISTANCE, RLOOP (Ω)
Note: Tip lead is open; VBAT = –48 V.
12-3016 (C)
Figure 18. Ring Ground Detection Programming
Note: VBAT = –48 V; ILIM = 22 mA; RDC1 = 113 Ω.
12-3051 (C)
Figure 20. Loop Current vs. Loop Resistance
18
Lucent Technologies Inc.
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