Specifications

Chapter 4 – SocketModem (MT2456SMI-22)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342F) 91
Electrical Characteristics
3.3V Serial SocketModem
3.3VDC Characteristics (TA = 0°C to 70°C; 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 (TA = 0°C to 50°C; 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