Specifications

PART 2 – Cellular SocketModems Chapter 7 – SocketModem Cell & iCell HSPA (H3)
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342P) 114
DC Electrical Characteristics
I/O DC Characteristics
5VDC Characteristics VDD = 5V (± 0.5V)
Digital Inputs
–DTR (40), –TXD (35), –RTS (33)
Input High
Min 2.0V
Input Low
Max 0.8V
–RESET
Input High
Min 2.0V
Input Low
Max 0.8V
Digital Outputs
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
Output High
Min 3.8V
Output Low
Max 0.55V
Current Drive
4mA
Digital Input Capacitance
10 pF
Electrical Specifications
Pin Signal Name
V
IL
V
IH
V
OL
V
OH
Min
Max
Min
Max
Min
Max
Min
Max
J24 -RESET 0.8 2.0 -- -- -- --
J25 USB VBUS -0.3 0.8 2.0 8.7 -- -- -- --
J26 GND -- -- -- -- -- -- -- --
J27 USB DP 0.8 2 0.3 2.8
J28 USB DM 0.8 2 0.3 2.8
J33 -RTS -0.3 0.8 2.0 5.5 -- -- -- --
J34 -RXD -- -- -- -- 0.26 3.98
J35 -TXD -0.3 0.8 2.0 5.5 -- -- -- --
J36 -RI -- -- -- -- 0.55 3.8
J37 -DSR -- -- -- -- 0.26 3.98
J38 -CTS -- -- -- -- 0.26 3.98
J39 -DCD -- -- -- -- 0.26 3.98
J40 -DTR -0.3 0.8 2.0 5.5 -- -- -- --
J41 GND -- -- -- -- -- -- -- --
J48
GPIO0
-0.3
0.8
2.0
5.5
0.4
2.9
J49 GPIO1 -0.3 0.8 2.0 5.5 0.4 2.9
J50 GPIO2 -0.3 0.8 2.0 5.5 0.4 2.9
J51 GPIO3 -0.3 0.8 2.0 5.5 0.4 2.9
J58 -LED LINK -- -- -- -- 0 0.45 2.85 3.3
J61 VCC -- -- -- -- -- -- -- --
J63 GND -- -- -- -- -- -- -- --
Absolute Maximum Rating:
VCC Voltage (Survival) -0.3V to +6.0V