AccessRunner ADSL-USB Modem Device Set Data Sheet
Table 3-3. CX20431 AFE Hardware Signal Definitions (Continued)
Signal Name
Pin
I/O
I/O Type
Signal Name/Description
NOT USED
Receive Input Positive. Not used. Leave open.
INP_RX
3
4
I
I
Ia
Ia
Receive Input Negative. Not used. Leave open.
No Connect. These pins are not connected to internal circuitry.
INM_RX
NC
12, 20, 26, 28
NOTES:
I/O Types: See Table 3-15.
Table 3-14. CX20431 AFE Input/Output Type Descriptions
I/O Type
Description
Ia
It
Analog input
Digital input, +5V tolerant, C = 8 pF
IN
It/Ot4
Ith
Digital input, +5V tolerant, C = 8 pF/Digital output, 4 mA, Z
IN
Digital input, +5V tolerant, with hysteresis, C = 8 pF
IN
= 80 Ω
INT
Itpd
Digital input, +5V tolerant, 75k Ω pull-down, C = 8 pF
IN
Itpu
Digital input, +5V tolerant, 75k Ω pull-up, C = 8 pF
IN
Itpu/Ot4
Digital input, +5V tolerant, 75k Ω pull-up, C = 8 pF/Digital output, 4 mA, Z
= 80 Ω
INT
IN
Oa
Analog Output
Otts4
Digital output, 3-State, 4 mA, Z
=80 Ω
INT
NOTES:
1. See DC characteristics in Table 3-15 and analog electrical characteristics in Table 3-16.
2. I/O Type corresponds to the device Pad Type. The I/O column in tables refers to signal I/O direction used in the application.
Conexant
100427B
3-21
CONEXANT [ CONEXANT SYSTEMS, INC ]
