Specifications

PART 3 – Analog SocketModems Chapter 9 – SocketModem (MT9234SMI)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342P) 137
DC Electrical Characteristics
5V Serial – Standard (SMI) and Medical Device (SMI-HV) Build Options
5VDC Characteristics (VDD = 5V ± 0.25V) VDDMAX = 5.25V
Digital Inputs
–DTR (40), –TXD (35), –RTS (33)
Input High
Min 2.52V
Input Low
Max .9V
–Reset (24)
Input High
Min 2.52V
Input Low
Max 0.3V
Digital Outputs
–DCD (39), –CTS (38), –DSR (37),
–RI (36), –RXD (34)
Output
High
Min 2.3V
Output Low
Max 0.4V
Current Drive
2mA
Digital Input Capacitance
5 pF
5V Parallel – Standard (SMI) and Medical Device (SMI-HV) Build Options
5VDC Characteristics (VDD = 5V ± 0.25V) VDDMAX = 5.25V
Digital Inputs
–DS (40)
Input High
Min 2.52V
Input Low
Max 0.9V
Digital Inputs (hysteresis input buffer)
A0 (31), A1 (25), A2 (34),
–WR (32), –RD (33)
Input High
Min 2.52V
Input Low
Max 0.9V
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 2.52V
Input Low
Max 0.9V
Digital Output
INT (30)
Output High
Min 2.3V
Output Low
Max 0.4V
Current Drive
2mA
Digital Input Capacitance
5 pF
3.3V Serial – Industrial Temperature (SMI-L) Build Option
3.3VDC Characteristics (VDD = 3.3V ± 0.3V) VDDMAX = 3.6V
Digital Inputs
–DTR (40), –TXD (35), –RTS (33)
Input High
Min 2.52V
Input Low
Max 0.9V
–Reset (24)
Input High
Min 2.52V
Input Low
Max 0.3V
Digital Outputs
–DCD (39), –CTS (38), –DSR (37), –RI (36),
–RXD (34)
Output High
Min. 2.3V
Output Low
Max 0.4V
Current Drive
2mA
Digital Input Capacitance
5 pF
3.3V Parallel – Industrial Temperature (SMI-L) Build Options
3.3VDC Characteristics (VDD = 3.3V ± 0.3V) VDDMAX = 3.6V
Digital Inputs
–DS (40)
Input High
Min 2.52V
Input Low
Max 0.9V
Digital Inputs (hysteresis input buffer)
A0 (31), A1 (25), A2 (34), –WR (32), –RD (33)
Input High
Min 2.52V
Input Low
Max 0.9V
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 2.52V
Input Low
Max 0.9V
Digital Output
INT (30)
Output High
Min 2.3V
Output Low
Max 0.4V
Current Drive
2mA
Digital Input Capacitance
5 pF