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Chapter 3 – Electrical Characteristics
SocketModem Global MT5634SMI Developer’s Guide 14
Chapter 3 – Electrical Characteristics
Introduction
Electrical characteristics for the 5V Serial SocketModem, 3.3V Serial SocketModem, 5V Parallel SocketModem,
and the 3.3V Parallel SocketModem are presented in this chapter.
I/O Electrical Characteristics
5V Serial – Standard (SMI) and Medical Device (SMI-HV) Build Options
5 Vdc Characteristics (TA = 0 °C to 50 °C; VDD = 5 V ± 0.25 V) VDDMAX = 5.25 V
Digital Inputs
–DTR (40), –TXD (35), –RTS (33), –RESET (24)
Input High
Min 3.675 V
Input Low
Max 1.4 V
Digital Outputs
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
Output High
Min. 4 V
Output Low
Max 0.4 V
Current Drive
2 ma
Digital Input Capacitance 5 PF
3.3V Serial – Industrial Temperature (SMI-ITP) Build Option
3.3 Vdc Characteristics (TA = -40 °C to 85 °C; VDD = 3.3 V ± 0.3 V) VDDMAX = 3.6 V
Digital Inputs
–DTR (40), –TXD (35), –RTS (33), –RESET (24)
Input High
Min 2.52 V
Input Low
Max 0.9 V
Digital Outputs
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
Output High
Min. 2.3 V
Output Low
Max 0.4 V
Current Drive
2 ma
Digital Input Capacitance 5 PF
5V Parallel – Standard (SMI) and Medical Device (SMI-HV) Build Options
5 Vdc Characteristics (TA = 0 °C to 50 °C; VDD = 5 V ± 0.25 V) VDDMAX = 5.25 V
Digital Inputs
–DS (40)
Input High
Min. 3.675 V
Max. 1.4 V
Digital Inputs (hysteresis input buffer)
A0 (31), A1 (25), A2 (34), –WR (32), –RD (33)
Input High
Min. 3.675 V
Input Low
Max. 1.4 V
Digital Input / Output
Output buffer can source 12 mA at 0.4 V
DO (37), D1 (38), D2 (29), D3 (39), D4 (35), D5 (36), D6
(41), D7 (27)
Input High
Min. 3.675 V
Input Low
Max. 1.4 V
Digital Output
INT (30)
Output High
Min. 4 V
Output Low
Max 0.4 V
Current Drive
2 ma
Digital Input Capacitance 5 PF