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MAX3320TCAP+T |MAX3320TCAPTMAXIMN/a2711avai3V to 5.5V, Up to 250kbps True RS-232 Transceiver with 4µA AutoShutdown Plus and Power On Reset


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MAX3320TCAP+T
3V to 5.5V, Up to 250kbps True RS-232 Transceiver with 4µA AutoShutdown Plus and Power On Reset
_______________General Description
The MAX3320 combines a microprocessor (μP) super-
visory circuit with an RS-232 transceiver. The power-on
reset performs a single function: it asserts a reset signal
whenever the VCCsupply voltage declines below a pre-
set threshold, staying asserted for at least 100ms after
VCCrises above the reset threshold. The MAX3320 has
an active-low RESEToutput, which is guaranteed to be in
the correct state for VCCdown to 1V. The reset compara-
tor is designed to ignore fast transients on VCC. Reset
thresholds suitable for operation with a variety of supply
voltages are available.
The MAX3320 transceivers have a proprietary low-
dropout transmitter output stage, enabling true RS-232
performance with a dual charge pump powered from a
+3V to +5.5V supply. The device requires only four
small 0.1μF external charge-pump capacitors, and is
guaranteed to run at data rates of up to 250kbps. It
comes in the space-saving 20-pin SSOP package.
________________________Applications

Palmtop Computers
Portable/Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
____________________________Features
Precise Monitoring of 5V and 3.3V Power-
Supply Voltages:
— 100ms (min) Power-On RESETPulse Width
— Power-Supply Transient Immunity
— Guaranteed RESETValid to VCC= 1V
4μA Supply Current Achieved with
AutoShutdown Plus
Receivers Always ActivePower-On Reset Always Active4μA Low-Power Shutdown250kbps Guaranteed Data Rate
3V to 5.5V, up to 250kbps True RS-232 Transceiverith 4μA AutoShutdown Plus and Power-On Reset

C1+
VCC
C1-
GNDV-
C2-
C2+
TOP VIEW
T1OUT
T2OUT
R1IN
R2INR2OUT
R1OUT
T2IN
T1IN
FORCEON
FORCEOFFRESET
INVALID
MAXxxx
SSOP

MAX3320
__________________Pin Configuration

19-1253; Rev 0; 8/97
PART*

MAX3320_CAP
MAX3320_EAP-40°C to +85°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE

20 SSOP
20 SSOP
______________Ordering Information
This part offers a choice of reset threshold voltage. From the
table below, select the suffix corresponding to the desired
threshold and insert it into the blank to complete the part
number.
AutoShutdown Plus is a trademark of Maxim Integrated Products.
SUFFIX

RESET THRESHOLD
(V)

Typical Operating Circuit appears at end of data sheet.
3V to 5.5V, up to 250kbps True RS-232 Transceiverith 4μA AutoShutdown Plus and Power-On Reset
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= 3V to 5.5V, C1–C4 = 0.1μF (tested at 3.3V ±10%), C1 = 0.047μF, C2–C4 = 0.33μF (tested at 5V ±10%), TA= TMINto TMAX,
unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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................................-0.3V to 6V
R_IN.................................................................................±25V
Output Voltages
T_OUT..........................................................................±13.2V
R_OUT, INVALID, RESET.......................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration
T_OUT....................................................................Continuous
Continuous Power Dissipation (TA= +70°C)
SSOP (derate 8.00mW/°C above +70°C)....................640mW
Operating Temperature Ranges
MAX3320_CAP...................................................0°C to +70°C
MAX3320_EAP................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C-0.30.3Figure 3Receiver Input Threshold to
INVALIDOutput Low
-2.7Figure 3, negative thresholdV2.7Figure 3, positive thresholdReceiver Input Threshold to
INVALIDOutput High357TA= +25°CInput Resistance0.3Input Hysteresis
1.82.4VCC= 5VV1.52.4VCC= 3.3VInput Threshold High
0.81.5VCC= 5VV0.61.2VCC= 3.3VInput Threshold Low-2525Input Voltage Range4.010FORCEOFF= GND, TA= +25°CShutdown Supply Current 0.451.0No load, VCC= 3.3V or 5V, TA= +25°CPower-Supply CurrentVCC-VCC -
0.60.1IOUT= -1mAOutput Voltage High0.4IOUT= 1.6mAOutput Voltage Low250T_IN, FORCEON, FORCEOFFInput Hysteresis±0.01±1.0T_IN, FORCEON, FORCEOFFInput Leakage Current4.010All R_IN unconnected, FORCEON = GND,
FORCEOFF= VCC, all T_IN = VCCor GND, TA= +25°C
AutoShutdown Plus
Supply Current0.8T_IN, FORCEON, FORCEOFFInput Logic Threshold Low2.0Input Logic Threshold High
UNITSMINTYPMAXCONDITIONSPARAMETER

T_IN, FORCEON,
FORCEOFF2.40.4IOUT= 1.6mAINVALIDOutput Voltage Low
Note 1:
V+ and V- can have a magnitude of +7V (max), but their absolute difference cannot exceed +13V.
VCC= 3.3V
VCC= 5V
DC CHARACTERISTICS
LOGIC INPUTS AND RECEIVER OUTPUTS
RECEIVER INPUTS

INVALIDOUTPUT
V to 5.5V, up to 250kbps True RS-232 Transceiverith 4μA AutoShutdown Plus and Power-On Resetsec153060Figure 3Receiver or Transmitter Edge
to Shutdown25Figure 5Receiver or Transmitter Edge
to Transmitters EnabledμsFigure 3Receiver Positive or Negative
Threshold to INVALIDLow0.1Figure 3Receiver Positive or Negative
Threshold to INVALIDHigh
UNITSMINTYPMAXCONDITIONSPARAMETER
ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3V to 5.5V, C1–C4 = 0.1μF (tested at 3.3V ±10%), C1 = 0.047μF, C2–C4 = 0.33μF (tested at 5V ±10%), TA= TMINto TMAX,
unless otherwise noted. Typical values are at TA= +25°C.)±5.0±5.4All transmitter outputs loaded with 3kΩto groundOutput Voltage Swing30010MVCC= V+ = V- = GND, VT_OUT= ±2VOutput Resistance±35±60T_OUT = GND, T_IN = VCCor GNDOutput Short-Circuit Current±25VT_OUT= ±12V, VCC= 0 to 5.5V, transmitters disabledOutput Leakage Current1.05.5MAX3320_CRESETOperating Voltage
Range1.25.5MAX3320_E
4.004.254.50MAX3320A
RESETThreshold2.702.853.00MAX3320B
4.504.634.75MAX3320L
3.003.083.15MAX3320T
0.3ISINK= 1.2mA, VCC= reset threshold, MAX3320B/T
RESETOutput Voltage0.4ISINK= 3.2mA, VCC= reset threshold, MAX3320A/L
0.3ISINK= 50μA, VCC> 1V, MAX3320_C
0.4ISINK= 100μA, VCC> 1.2V, MAX3320_EVCC- 0.6IOUT= -1mAINVALIDOutput Voltage High
AUTOSHUTDOWN PLUS (FORCEON = GND, FORCEOFF= VCC)
TRANSMITTER OUTPUTS

RESETOUTPUT
3V to 5.5V, up to 250kbps True RS-232 Transceiverith 4μA AutoShutdown Plus and Power-On Reset
VT_OUT-
VT_OUT+
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE

X3320 TO
C01
LOAD CAPACITANCE (pF)
(VONE TRANSMITTER AT 250kbps
ONE TRANSMITTER AT 15.6kbps
LOAD = 3kΩ + CL20001000300040005000
SLEW RATE
vs. LOAD CAPACITANCE

3320 TO
C02
LOAD CAPACITANCE (pF)
(V
ONE TRANSMITTER AT 250kbps
ONE TRANSMITTER AT 15.6kbps
LOAD = 3kΩ + CL
NEGATIVE
SLEW
POSITIVE
SLEW
250kbps
120kbps
20kbps1020001000300040005000
SUPPLY CURRENT
vs. LOAD CAPACITANCE WHEN
TRANSMITTING DATA

AX3320 TOC03
LOAD CAPACITANCE (pF)
(m
ONE TRANSMITTER AT
FULL DATA RATE INDICATED
ONE TRANSMITTER AT
1/16 DATA RATE INDICATED
TIMING CHARACTERISTICS

(VCC= 3V to 5.5V, C1–C4 = 0.1μF, C1–C4 = 0.1μF (for 3.3V ±10%), C1 = 0.047μF, C2–C4 = 0.33μF (tested at 5V ±10%), = TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
kbps250RL= 3kΩ, CL= 1000pF, one transmitter switchingMaximum Data Rate100|tPHL- tPLH|Transmitter Skew
0.3μs0.3R_IN to R_OUT, CL= 150pFReceiver Propagation Delay
UNITSMINTYPMAXCONDITIONSPARAMETER

tPLH
tPHL200|tPHL- tPLH|Receiver Skew= 150pF to
1000pf
V/μs30VCC= 3.3V, RL= 3kΩto 7kΩ,
measured from +3V to -3V or -3V to
+3V, TA= +25°C
Transition-Region Slew Rate100280VCC= reset thresholdRESETActive Timeout Period40100mV overdrive from reset thresholdVCCto RESETDelay= 150pF to
2500pf430
__________________________________________Typical Operating Characteristics

(VCC= 3.3V, 250kbps data rate, C1–C4 = 0.1μF, all transmitters loaded with 3kΩ. Typical values are at TA= +25°C, unless
otherwise noted.)
V to 5.5V, up to 250kbps True RS-232 Transceiverith 4μA AutoShutdown Plus and Power-On Reset______________________________________________________________Pin Description
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
AX3320toc05
RESET COMPARATOR OVERDRIVE (mV)

NOT IN
SHUTDOWN
MODE
SHUTDOWN MODE
CBYPASS = 0.1μF0.960
NORMALIZED POWER-UP RESET
DELAY vs. TEMPERATURE
X3320 TO
C06
TEMPERATURE (°C)
____________________________Typical Operating Characteristics (continued)

(VCC= 3.3V, 250kbps data rate, C1–C4 = 0.1μF, all transmitters loaded with 3kΩ. Typical values are at TA= +25°C, unless
otherwise noted.)C1+Positive terminal of voltage-doubler charge-pump capacitorVCC+3V to +5.5V Supply VoltageC1-Negative terminal of voltage-doubler charge-pump capacitor
NAMEFUNCTION
V+5.5V generated by the charge pumpC2+Positive terminal of inverting charge-pump capacitor
PIN
C2-Negative terminal of inverting charge-pump capacitorV--5.5V generated by the charge pumpRESETRESETOutput. RESETremains low while VCCis below the reset threshold, and for 280ms (max)
after VCCrises above the reset threshold.INVALIDOutput of the Valid Signal Detector. Asserts when no valid RS-232 levels are present on any of
the receiver inputs for 90μs.
7, 8R_OUTTTL/CMOS Receiver Outputs (R1OUT and R2OUT)
5, 6T_INTTL/CMOS Transmitter Inputs (T1IN and T2IN)GNDGround
15, 16T_OUTRS-232 Transmitter Outputs (T2OUT and T1OUT)
13, 14R_INRS-232 Receiver Inputs (R2IN and R1IN)FORCEONForce-On Input. Drive FORCEON high to override AutoShutdown Plus, keeping transmitters on
(FORCEOFFmust be high) (Table 1).FORCEOFFForce-Off Input. Drive FORCEOFFlow to shut down transmitters and on-board power supply.
This overrides AutoShutdown Plus and FORCEON (Table 1).
______________ Detailed Description
Dual Charge-Pump Voltage Converter

The MAX3320’s internal power supply consists of a reg-
ulated dual charge pump that provides output voltages
of +5.5V (doubling charge pump) and -5.5V (inverting
charge pump) while VCCremains in the 3V to 5.5V
range. The charge pumps operate in discontinuous
mode; they are enabled if the output voltages are less
than 5.5V, and disabled if output voltages exceed 5.5V.
Each charge pump requires a flying capacitor (C1, C2)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supplies.
RS-232 Transmitters

The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5V EIA/TIA-232 levels. The
MAX3320 transmitters guarantee a 250kbps data rate
with worst-case loads of 3kΩin parallel with 1000pF,
providing compatibility with PC-to-PC communication
software (such as LapLink™). Transmitters can be par-
alleled to drive multiple receivers. Figure 1 shows a
complete system connection.
When FORCEOFFis driven to ground, the transmitter’s
outputs become high impedance. When the
AutoShutdown Plus circuitry senses that all receiver
and transmitter inputs are inactive for more than 30sec,
the transmitters turn off and the outputs go into a high-
impedance state, but the receivers remain active.
When the power is off or the MAX3320 is shut down,
outputs may be driven up to ±12V.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GNDor VCC.

Laplink is a trademark of Traveling Software.
RS-232 Receivers

The receivers convert RS-232 signals to CMOS-logic out-
put levels. All receivers have inverting outputs and are
active in shutdown FORCEOFF(Table 1).
AutoShutdown Plus Mode

Maxim’s AutoShutdown Plus feature, which operates
when FORCEOFFis high and FORCEON is low, achieves
a 4μA supply current. When the MAX3320 senses no
valid signal levels on all receiver and transmitter inputs for
30sec, the on-board power supply and drivers shut off,
MAX3320
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
Figure 1. Interface Under Control of PMU
Table 1. MAX3320 Output Control Truth Table

FORCEOFFHigh-Z
T_OUT

Active
R_OUT
ActiveActiveNormal operation
(forced on)X1ActiveActiveNormal operation
(AutoShutdown Plus)<30sec*0High-ZActiveShutdown
(AutoShutdown Plus)>30sec*0
FORCEON

Shutdown
(forced off)XX
OPERATION
STATUS
AUTOSHUTDOWN
PLUS*

X = Don’t Care
*Time since last receiver or transmitter input activityV to 5.5V, up to 250kbps True RS-232 Transceiverith 4μA AutoShutdown Plus and Power-On Reset
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