Specifications

Chapter 4 – SocketModem (MT2492SMI)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342I) 92
SocketModem Configuration
Serial Configuration
The MT2492SMI SocketModem with a serial interface provides an on-board DAA with tip and ring connections, audio
circuit for call-progress monitoring and serial interface via logic level signals.
Note: The bolded, shaded pins are active MT2492MI pins.
Top View
Serial SocketModem Pinout
For pin descriptions, see the Universal Pinout Description in Chapter 1.
Electrical Characteristics
3.3V Serial SocketModem
3.3VDC Characteristics (VDD = 3.3V ± 0.3V) VDDMAX = 3.6V
Inputs Input High Input Low
–
DTR (40),
–
TXD (35),
–
RTS (33),
–
RESET (24) Min 2.0V Max 0.8V
Outputs Output High Output Low
–
DCD (39),
–
CTS (38),
–
DSR (37),
–
RI (36),
–
RXD (34)
2mA, Z
INT
= 120 Ω
Min 2.4V Max 0.4V
Digital Input Capacitance 50pF
5V Serial SocketModem
5VDC Characteristics (VDD = 5V ± 0.25V) VDDMAX = 5.25V
Inputs Input High Input Low
–
DTR (40),
–
TXD (35),
–
RTS (33),
–
RESET (24) Min 2.0V Max 0.8V
Outputs Output High Output Low
–
DCD (39),
–
CTS (38),
–
DSR (37),
–
RI (36),
–
RXD (34)
2mA, Z
INT
= 120 Ω
Min 2.4V Max 0.4V
Digital Input Capacitance 50pF