le79r241 Zarlink Semiconductor, le79r241 Datasheet - Page 12

• Manufacturer Part Number: le79r241
• Description: Intelligent Subscriber Line Interface Circuit
• Manufacturer: Zarlink Semiconductor

DC Specifications
Unless otherwise specified, test conditions are: VCC = 5 V, RMGPi = RMGLi = 1 kΩ, BATH = –90 V,
BATL = –36 V, RRX = 150 kΩ, RL = 600 Ω, RSA = RSB = 200 kΩ, RFA = RFB = 50 Ω, CHP = 22 nF,
CAD = CBD = 22 nF, IRSN = 50 µA, Active low battery. DC-feed conditions are normally set by the 790
series codec. When the Le79R241 ISLIC device is tested by itself, its operating conditions must be
simulated as if it were connected to an ideal 790 series codec.
No.
10
11
12
13
14
15
16
17
18
19
20
21
1
2
3
4
5
6
7
8
9
Two-wire loop voltage
(including offset)
Feed resistance per leg
at pins AD & BD
Feed current limit
IMT current
ILG current
Ternary input voltage
boundaries for LD pin.
Mid-level input source
must be Vref.
Logic Inputs P1, P2, P3
VTX output offset
VREF input current
CREF input current
ß, DC Ratio of VSAB to
loop voltage:
Fault Indicator Threshold
Gain from VLB pin to A
or B pin, KLG
VLB pin input current
ILOOP/IMT
ILONG/ILG
Input current, SA and SB
pins
K1
ISA/IMT
ISB/ILG
VSAB output offset
IMT output offset
ILG output offset
β
=
-------------------------- -
V
SA
V
Item
SAB
–
V
SB
Standby mode, open circuit,
|VBH| < 55 V
|VBH| > 55 V
GND − VB
Any Active mode (does not
include OHT),
OHT mode, RL = 2200 Ω
I
Standby mode
Feed current
Standby mode, RL = 600
Standby mode, RL = 2200
Standby mode
A to VBH
B to Ground
Low boundary
Mid boundary
High boundary
Input high current
Input low current
Mid-level current
Input high voltage
Input low voltage
Input high current
Input low current
VREF = 1.4 V
CREF = 3.3 V
Tj < 145°C, VSA – VSB = 22 V
Voltage Output on IMT
VLB = VREF ± 1 V
ILOOP = 10 mA
ILONG = 10 mA
Active modes
Incremental DC current gain
Disconnect ISA = 2 mA
Disconnect ISB = 2 mA
RL = 600 Ω, I
RSN
= 20 µA
Condition
Zarlink Semiconductor Inc.
RSN
= 50 µA
12
–40°C
+25°C
+85°C
Ω
Ω
VREF–0.3
CREF – 1
VBH – 8
0.0088
13.88
462.5
19.8
44.6
Min
130
–50
283
575
2.0
-20
-20
2.8
48
18
28
28
10
–3
–1
-3
4
CREF – 0.3 V
VBH–7
0.0097
V
Typ
500
250
108
308
615
1.0
7.0
3.6
1.4
51
15
22
34
56
47
51
50
30
12
REF
0
0
0
0
0
6
0
0
VREF+0.3
VBH–6
0.0106
CREF
16.13
537.5
Max
55.5
55.5
8.75
375
100
333
655
0.6
0.8
+50
3.0
45
20
20
16
3
3
1
RT Network
ohms
Unit
mA
mV
V/V
V/V
A/A
A/A
A/A
mV
30 k Ω
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
V
V
V
V
V
V
V
VREF
Note
30 k Ω
390 pf
2.
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