MAX3243*

Features:

1A Supply Current Achieved with AutoShutdown
Small 0.1F Capacitors
True RS-232 Operation from VCC = +3.0V to +5.5V
Meets EIA/TIA-562 Specifications Down to 2.7V
Guaranteed 120kbps Data Rate
6V/s Min Guaranteed Slew Rate
Smallest Single-Supply RS-232 Transceiver (MAX3221)
Guaranteed Mouse Driveability (MAX3243)
Small TSSOP Package (MAX3223/MAX3243)


Application

Notebook, Subnotebook, and Palmtop Computers
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers


Pinout

PIN			NAME	FUNCTION
MAX3221	MAX3223	MAX3243
1	1	-	EN	Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver outputs into a high-Z state.
5	5	1	C2+	Positive terminal of inverting charge-pump capacitor
6	6	2	C2-	Negative terminal of inverting charge-pump capacitor
7	7	3	V-	-5.5V generated by the charge pump
8	9, 16	48	R_IN	RS-232 Receiver Inputs
13	8, 17	9, 10, 11	T_OUT	RS-232 Transmitter Outputs
11	12, 13	12, 13, 14	T_IN	TTL/CMOS Transmitter Inputs
9	10, 15	1519	R_OUT	TTL/CMOS Receiver Outputs
-	-	20	R2OUTB	Noninverting Receiver Output-active in shutdown
10	11	21	INVALID	Output of the valid signal detector. Indicates if a valid RS-232 level is presINVALID ent on receiver inputs logic "1".
16	20	22	FORCEOFF	Drive low to shut down transmitters and on-board power supply. This over rides all automatic circuitry andFORCEON (Table 1).
12	14	23	FORCEON	Drive high to override automatic circuitry keeping transmitters on (FORCEOFF must be high) (Table 1).
4	4	24	C1-	Negative terminal of the voltage doubler charge-pump capacitor
14	18	25	GND	Ground
15	19	26	VCC	TTL/CMOS Receiver Outputs
3	3	27	V+	+5.5V generated by the charge pump
2	2	28	C1+	Positive terminal of the voltage doubler charge-pump capacitor

Specifications

VCC.........................................................................-0.3V to +6V
V+ (Note 1) ............................................................-0.3V to +7V
V- (Note 1) .............................................................+0.3V to -7V
V+ + |V-| (Note 1)..............................................................+13V
Input Voltages
T_IN, FORCEOFF, FORCEON, EN (MAX3223) ...........-0.3V to +6V
R_IN ..................................................................................±25V
Output Voltages
T_OUT.............................................................................±13.2V
R_OUT, INVALID ........................................-0.3V to (VCC + 0.3V)
Short-Circuit Duration
T_OUT ......................................................................Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C) ..........571mW
16-Pin TSSOP (derate 6.70mW/°C above +70°C) ........533mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...89mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
20-Pin TSSOP DIP (derate 7.00mW/°C above +70°C)...559mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C) ..........1W
28-Pin SSOP (derate 9.52mW/°C above +70°C) ..........762mW
28-Pin TSSOP (derate 8.70mW/°C above +70°C) ........696mW
Operating Temperature Ranges
MAX32_ _C_ _......................................................0°C to +70°C
MAX32_ _E_ _...................................................-40°C to +85°C
Storage Temperature Range ..........................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................+300°C


Description

The MAX3243* achieve 1A supply current with Maxim's revolutionary AutoShutdown™ feature. When the MAX3221/MAX3223/MAX3243 do not sense a valid signal level on their receiver inputs, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected, peripheral are turned off.The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or operating system.

The MAX3243*  transceivers are 3Vpowered EIA/TIA-232 and V.28/V.24 communications interfaces intended for notebook computer applications.A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. A guaranteed data rate of 120kbps provides compatibility with popular software for communicating with personal  computers.