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Chapter 3 - Electrical Characteristics
Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide 9
Chapter 3 – Electrical Characteristics
3.3V and 5V Serial SocketModem
3.3V DC Characteristics (TA = 0°C to 70°C; VDD = 3.3 V ± 0.3 V) VDDMAX = 3.6 V
5V DC Characteristics (TA = 0°C to 50°C; VDD = 5 V ± 0.25 V)
VDDMAX = 5.25 V
Inputs
Input High Input Low
–DTR (40), –TXD (35), –RTS (33), –RESET (24) Min 2.0 V Max 0.8 V
Outputs Output High Output Low
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
2mA, Z
INT
= 120 Ω
Digital Input Capacitance
Min 2.4 V Max 0.4 V
50pF
Handling Precautions
All electronic devices should be handled with certain precautions to avoid damage due to the accumulation of
static charge. Although input protection circuitry has been incorporated into the devices to minimize the effect of
this static buildup, proper precautions should be taken to avoid exposure to electrostatic discharge during
handling and mounting.