Specifications
Chapter 2 – SocketModem (MT5600SMI & MT5656SMI)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342F) 57
Electrical Characteristics
3.3V Serial SocketModem
3.3VDC Characteristics (TA = 0°C to 70°C; VDD = 3.3V ± 0.3V) VDDMAX = 3.6V
Inputs
–DTR (40), –TXD (35), –RTS (33), –RESET (24)
Input High
Min 2.0V
Input Low
Max 0.8V
Outputs
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
2 mA, Z INT = 120 Ω
Output High
Min 2.4V
Output Low
Max 0.5V
Digital Input Capacitance
50pF
3.3 V Parallel SocketModem
Electrical characteristics for Parallel SocketModem devices are presented below.
3.3VDC Characteristics (TA = 0°C to 70°C; VDD = 3.3V ± 0.3V)
VDDMAX = 3.6V
Digital Inputs
–DS (40)
Input High
Min 2.0V
Input Low
Max 0.8V
Digital Inputs (hysteresis input buffer)
A0 (31), A1 (25), A2 (34), –WR (32), –RD (33)
8mA Z
INT
= 50Ω 2 mA Z
INT
= 120 Ω
Input High
Min 2.0V
Input Low
Max 0.8V
Digital Input/Output
DO (37), D1 (38), D2 (29), D3 (39), D4 (35), D5 (36), D6 (41),
D7 (27)
2 mA, Z
INT
= 120 Ω
Input High
Min 2.0V
Output High
Min 2.4V
Input Low
Max 0.8V
Output Low
Max 0.5V
Digital Output
INT (30)
2 mA, Z
INT
= 120 Ω
Output High
Min 2.4V
Output Low
Max 0.5V
Digital Input Capacitance
50pF
5V Serial SocketModem
5VDC Characteristics (TA = 0 °C to 50 °C; VDD = 5V ± 0.25V) VDDMAX = 5.25V
Digital Inputs
–DTR (40), –TXD (35), –RTS (33), –RESET (24)
Input High
Min 2V
Input Low
Max 0.8V
Digital Outputs
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
Output High
Min 2.4V
Output Low
Max 0.5V
Current Drive
15mA
Digital Input Capacitance
5pF
5V Parallel SocketModem
5VDC Characteristics (TA = 0 °C to 50 °C; VDD = 5V ± 0.25V) VDDMAX = 5.25V
Digital Inputs
–DS (40)
Input High
Min 2V
Input Low
Max 0.8V
Digital Inputs (hysteresis input buffer)
A0 (31), A1 (25), –WR (32), –RD (33)
Input High
Min 2V
Input Low
Max 0.8V
Digital Input / Output
DO (37), D1 (38), D2 (29), D3 (39), D4 (35), D5 (36), D6 (41),
D7 (27)
Input High
Min 2V
Input Low
Max 0.8V
Current Drive
8mA
Digital Output
INT (30)
Output High
Min 2.4 V
Output Low
Max 0.5 V
Current Drive
8mA
Digital Input Capacitance 5pF