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Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 14
5V Serial SocketModem
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 3.5 V
Input Low
Max .8 V
Digital Outputs
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
Output High
Min 4 V
Output Low
Max 0.5 V
Current Drive
15 ma
Digital Input Capacitance 5 PF
5V Parallel SocketModem
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 2 V
Input Low
Max .8 V
Digital Inputs (hysteresis input buffer)
A0 (31), A1 (25), –WR (32), –RD (33)
Input High
Min 2 V
Input Low
Max .8 V
Digital Input / Output
DO (37), D1 (38), D2 (29), D3 (39), D4 (35), D5 (36),
D6 (41), D7 (27)
Input High
Min 2 V
Input Low
Max .8 V
Current Drive
8 ma
Digital Output
INT (30)
Output High
Min 2.4 V
Output Low
Max 0.5 V
Current Drive
8 ma
Digital Input Capacitance 5 PF
Operating Conditions
Parameter Symbol Limits Units
+3.3 V Configuration
Supply voltage (Pin 61 = +3.3 V) VDD +3.13 to +3.47 VDC
Operating ambient temperature T
A
0 to +70 °C
+5 V Configuration
Supply voltage (Pin 61 = +5 V) VDD +4.75 to +5.25 VDC
Operating ambient temperature
T
A
0 to +70 °C
Absolute Maximum Ratings
Parameter Symbol Limits Units
Supply voltage (Pin 61 = +3.3 V) VDD -0.5 to +4.0 VDC
Supply voltage (Pin 61 = +5 V)
VDD -0.5 to +7.0 VDC
Input voltage V
IN
-0.5 to (VDD +0.5) VDC
Voltage applied to outputs in high impedance (Off) state V
OUT
+3.13 to +3.47
VDC
Storage temperature T
STG
-40 to +80 °C