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Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 13
Chapter 3 – Electrical Characteristics
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.
I/O Electrical Characteristics
3.3V Serial SocketModem
3.3V DC Characteristics (TA = 0°C to 70°C; VDD = 3.3 V ± 0.3 V) VDDMAX = 3.6 V
Inputs
–DTR (40), –TXD (35), –RTS (33), –RESET (24)
Input High
Min 2.0 V
Input Low
Max 0.8 V
Inputs
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
2mA, Z INT = 120
W
Output High
Min 2.4 V
Output Low
Max 0.5 V
Digital Input Capacitance 50pF
3.3V Parallel SocketModem
Electrical characteristics for Parallel SocketModem devices are presented below.
3.3V DC Characteristics (TA = 0°C to 70°C; VDD = 3.3 V ± 0.3 V)
VDDMAX = 3.6 V
Digital Inputs
–DS (40)
Input High
Min 2.0 V
Input Low
Max 0.8 V
Digital Inputs (hysteresis input buffer)
A0 (31), A1 (25), A2 (34), –WR (32), –RD (33)
8mA Z
INT
= 50W 2mA Z
INT
= 120 W
Input High
Min 2.0 V
Input Low
Max 0.8 V
Digital Input/Output
DO (37), D1 (38), D2 (29), D3 (39), D4 (35), D5
(36), D6 (41), D7 (27)
2mA, Z
INT
= 120 W
Input High
Min 2.0 V
Output High
Min 2.4 V
Input Low
Max 0.8 V
Output Low
Max 0.5 V
Digital Output
INT (30)
2mA, Z
INT
= 120 W
Output High
Min 2.4 V
Output Low
Max 0.5 V
Digital Input Capacitance 50pF