Specifications

Chapter 5 – SocketModem (MT2456SMI-22)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342I) 98
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