Multi-Tech Systems Chapter 3 Electrical Characteristics

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 preca utions to avoid damage due to the
accumulation of static charge. Although input protection circuitr y has been incorporated into the devices
to minimize the effect of this static buildup, proper precautions s hould 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) VDDM AX = 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 bel ow.
3.3V DC Characteristics (TA = 0°C to 70°C; VDD = 3.3 V ± 0.3 V) VDDM AX = 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