am79r251 Advanced Micro Devices, am79r251 Datasheet - Page 17

• Manufacturer Part Number: am79r251
• Description: Intelligent Subscriber Line Interface Circuit Islic
• Manufacturer: Advanced Micro Devices

SPECIFICATIONS
Target Specifications (See note 1)
No.
10
11
12
13
14
15
16
17
18
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
voltage:
Fault Indicator Threshold
Gain from VLB pin to A or
B pin
VLB pin input current
ILOOP/IMT
ILONG/ILG
Input current, SA and SB
pins
K1
ISA/IMT
ISB/ILG
, DC Ratio of VAB to loop
Item
=
------------------------- -
V
SA
V
SAB
–
V
SB
Standby mode, open circuit,
|VBH| < 55 V
|VBH| > 55 V
Any Active mode (does not
include OHT), RL = 600 ,
I
OHT mode, RL = 600 ,
I
Standby mode
Feed current
Standby mode, RL = 1930
Standby mode
Low 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 1V
ILOOP = 10 mA
ILONG = 10 mA
Active modes
Incremental DC current gain
Disconnect, ISA = 2 mA
Disconnect, ISB = 2 mA
RSN
RSN
Standby mode, RL = 600
A to VBH
B to Ground
= 50 A
= 36 A
Condition
Am79R251
CREF – 1
VBH – ?
13.88
TBD
8.64
44.6
Min
130
–50
2.0
36
43
0.00667
CREF -
VBH–5
0.3 V
TBD
TBD
TBD
TBD
TBD
TBD
10.8
Typ
250
300
600
500
1.0
50
15
30
56
10
50
45
12
6
VBH–?
CREF
16.13
12.96
Max
375
0.6
0.8
+50
3.0
Unit
mA
V/V
V/V
A/A
A/A
A/A
mA
mV
mA
mA
µA
µA
µA
µA
µA
µA
V
V
V
V
V
V
V
Note
—
—
—
—
3
3
3
3
3
3
17