Multi-Tech Systems 92U04A22740 User Manual
Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. SocketModem CDMA Developer’s Guide
9
Chapter 3 – Electrical Characteristics
Electrical characteristics for the 5V Serial SocketModem are presented in this chapter.
I/O Electrical Characteristics
5 Vdc Characteristics (TA = -20° C to 55° C; VDD = 5 V ± 0.25 V) VDDMAX = 5.25 V
Digital Inputs
–DTR (40), –TXD (35), –RTS (33), –RESET (24)
–DTR (40), –TXD (35), –RTS (33), –RESET (24)
Input High
Min 3.675 V
Min 3.675 V
Input Low
Max 1.4 V
Max 1.4 V
Digital Outputs
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
Output High
Min. 4 V
Min. 4 V
Output Low
Max 0.4 V
Max 0.4 V
Current
Drive: 2 ma
Drive: 2 ma
Digital Input Capacitance
5 PF
Power Consumption
Operating Mode
Band
Average (mA)
CDMA RXTX
Cellular
615
Full Power
PCS
770
Cellular
340
CMA RXTX
Average Power
Average Power
PCS
445
Cellular
20
CDMA Standby
PCS
20
Handling Precautions
All devices must be handled with certain precautions to avoid damage due to the accumulation of static
charge. Although input protection circuitry has been incorporated into the devices to minimize the effect of
this static buildup, proper precautions should be taken to avoid exposure to electrostatic discharge during
handling and mounting.
charge. Although input protection circuitry has been incorporated into the devices to minimize the effect of
this static buildup, proper precautions should be taken to avoid exposure to electrostatic discharge during
handling and mounting.