ATTL7556AAU 查看數據表（PDF） - Agere -> LSI Corporation
零件编号
产品描述 (功能)
生产厂家
ATTL7556AAU Datasheet PDF : 28 Pages
| |||
L7556, L7557 Low-Power SLICs
with Battery Switch
Data Sheet
January 2000
Applications (continued)
Characteristic Curves (continued)
25
20
15
10
5
0
0
10
20
30
40
50
60
LOOP CLOSURE THRESHOLD RESISTOR, RLCTH (kΩ)
Note: VBAT = –48 V.
12-3015 (F)
Figure 17. Loop Closure Program Resistor
Selection
50
40
30
1
10 kΩ
20
L7556
BS = 0
10
BS = 1,
L7557 BS = 0
ILIM
–1
Rdc1
0
0
10
20
30
40
50
Notes:
VBAT1 = –48 V.
VBAT2 = –28 V.
ILIM = 22 mA.
Rdc1 = 115 Ω.
LOOP VOLTAGE (V)
12-3050.a(F)
Figure 19. Loop Current vs. Loop Voltage
35
30
25
20
15
10
5
0
0
50
100
150
200
250
RING GROUND CURRENT
DETECTION RESISTOR, RICM (kΩ)
Notes:
Tip lead is open.
VBAT = –48 V.
12-3016a (F)
Figure 18. Ring Ground Detection Programming
50
40
30
20 L7556
BS = 0
10
BS = 1,
L7557 BS = 0
0
0
Notes:
VBAT1 = –48 V.
VBAT2 = –28 V.
ILIM = 22 mA.
Rdc1 = 115 Ω.
500
1000
1500
2000
LOOP RESISTANCE, RLOOP (W)
12-3051.a(F)
Figure 20. Loop Current vs. Loop Resistance
18
Lucent Technologies Inc.
Share Link: 