Multi-Tech Systems MTSMC-EV3 RS-232 Signal DC Electrical Characteristics, Absolute Maximum Rating

CHAPTER 3 – SPECIFICATIONS

RS-232 Signal DC Electrical Characteristics

Units: Volts

Applies to the following pins:

Pin		Signal Name	Pin	Signal Name
J33	-RTS		J37	-DSR
J34	-RXD		J38	-CTS
J35	-TXD		J39	-DCD
J36	-RI		J40	-DTR

Parameter		Minimum		Maximum
3.3 Volt Powered
Input Low Level	0		0.55
Input High Level	1.5		3.3
Output Low Level	0		0.55
Output High Level	2.35		3.3
5 Volt Powered
Input Low Level	0		0.8
Input High Level	2.3		5
Output Low Level	0		0.55
Output High Level	3.7		5

Absolute Maximum Rating

All models can run with an input voltage of either 3.3V or 5V. The maximum voltage on any signal pin equals the input voltage.

Electrical Characteristics Other Pins

Pin		Signal Name			VIL				VIH					VOL					VOH
				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
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		--			--		--		--		--			--		--			--

SocketModem EV-DO MTSMC-EV3 Device Guide 10