UPD9903 Datasheet, PDF (18/28 Pages) NEC – UPD9903 ANALOG SUBSCRIBER LINE LSI DIGITAL CODEC

µPD9903
Parameter^Note
Loop detection operating
resistance (during normal
transmission)
Loop detection non-operating
resistance (during normal
transmission)
Loop detection operating
resistance (during on hook
transmission)
Loop detection non-operating
resistance (during on hook
transmission)
Loop release non-operating
resistance
Loop release operating
resistance
Ground detection 1 (C/O)
operating resistance
Ground detection 1 (C/O)
non-operating resistance
Ground-fault/power line
contact detection
operating resistance
Ground-fault/power line
contact detection non-
operating resistance
Ground-fault/power line
contact release non-
operating resistance
Ground-fault/power line
contact release operating
resistance
Symbol
RON1
Conditions
Includes termination
resistance
200 Ω feed
400 Ω feed
MIN.
200 Ω feed
400 Ω feed
3900
3500
RON2
Includes termination
resistance
200 Ω feed
400 Ω feed
200 Ω feed
400 Ω feed
2840
2440
RON3
RON4
Includes termination
resistance
200 Ω feed
400 Ω feed
200 Ω feed
400 Ω feed
Includes termination resistance
4540
4140
20
RON6
RON7
Includes termination
resistance
Off-hook state
Includes termination
resistance
ILMAX = 45/76 mA
ILMAX = 35 mA
ILMAX = 45/76 mA
ILMAX = 35 mA
870
1130
Includes termination resistance
10
TYP.
MAX.
2500
2100
Units
Ω
1900
Ω
1500
2960
Ω
2560
5.2
kΩ
340
Ω
480
Ω
1.4
kΩ
Note The above values are resistance-converted values.
18