MAX3223EEPP [ROCHESTER]
Line Transceiver, 2 Func, 2 Driver, 2 Rcvr, BICMOS, PDIP20, PLASTIC, DIP-20;
| 型号： | MAX3223EEPP |
| 厂家： | 
Rochester Electronics |
| 描述： | Line Transceiver, 2 Func, 2 Driver, 2 Rcvr, BICMOS, PDIP20, PLASTIC, DIP-20 驱动 信息通信管理 光电二极管 接口集成电路 驱动器 |
| 文件： | 总19页 (文件大小：1021K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1283; Rev 6; 9/ꢂꢀ
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
1/MAX243E
General Description
Next Generation Device Features
The MAX3221E/MAX3223E/MAX3243E are 3V-powered
EIA/TIA-232 and V.28/V.24 communications interfaces
with automatic shutdown/wakeup features, high data-
rate capabilities, and enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to 1ꢀkV using IEꢁ 1ꢂꢂꢂ-4-2 Air-
Gap Discharge, to 8kV using IEꢁ 1ꢂꢂꢂ-4-2 ꢁontact
Discharge, and to 1ꢀkV using the ꢃuman ꢄodꢅ Model.
♦ For Space-Constrained Applications:
MAX3228E/MAX3229E: 15kV ESD-Protected, +2.5V
to +5.5V RS-232 Transceivers in UCSP™
MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E: 15kV ESD-Protected Down to 10nA,
+3.0V to +5.5V, Up to 1Mbps, True RS-232
Transceivers (MAX3246E Available in a UCSP
Package)
The MAX3221E/MAX3223E/MAX3243E achieve a
1µA supplꢅ current with Maxim’s revolutionarꢅ
AutoShutdown™ feature. Theꢅ save power without
changes to the existing ꢄIOS or operating sꢅstem bꢅ enter-
ing low-power shutdown mode when the RS-232 cable is
disconnected, or when the transmitters of the connected
peripherals are off.
♦ For Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2Tx/2Rx RS-232 Transceivers with 15kV ESD-
Protected I/O and Logic Pins
Ordering Information
TEMP
RANGE
PIN-
PACKAGE
PKG
CODE
The transceivers have a proprietarꢅ low-dropout trans-
mitter output stage, delivering true RS-232 performance
from a +3.ꢂV to +ꢀ.ꢀV supplꢅ with a dual charge pump.
The charge pump requires onlꢅ four small ꢂ.1µF capaci-
tors for operation from a +3.3V supplꢅ. Each device is
guaranteed to run at data rates of 2ꢀꢂkbps while main-
taining RS-232 output levels.
PART
16 Thin QFN-EP
(ꢀmm x ꢀmm)
MAX3221EꢁTE ꢂ°ꢁ to +7ꢂ°ꢁ
T16ꢀꢀ-2
MAX3221EꢁUE ꢂ°ꢁ to +7ꢂ°ꢁ 16 TSSOP
MAX3221EꢁAE ꢂ°ꢁ to +7ꢂ°ꢁ 16 SSOP
MAX3221EEAE -4ꢂ°ꢁ to +8ꢀ°ꢁ 16 SSOP
16 Thin QFN-EP
—
—
—
The MAX3221E contains just one driver and one receiver,
making it the smallest single-supplꢅ RS-232 transceiver.
The MAX3223E has two drivers and two receivers. The
MAX3243E is a complete 3-driver/ꢀ-receiver serial port
ideal for notebook or subnotebook computers. It also
includes two noninverting receiver outputs that are alwaꢅs
active, allowing external devices to be monitored without
forward biasing the protection diodes in circuitrꢅ that maꢅ
be powered down.
MAX3221EETE -4ꢂ°ꢁ to +8ꢀ°ꢁ
T16ꢀꢀ-2
(ꢀmm x ꢀmm)
MAX3221EEUE -4ꢂ°ꢁ to +8ꢀ°ꢁ 16 TSSOP
MAX3223EꢁPP ꢂ°ꢁ to +7ꢂ°ꢁ 2ꢂ Plastic DIP
—
—
—
—
MAX3223EꢁAP
ꢂ°ꢁ to +7ꢂ°ꢁ 2ꢂ SSOP
MAX3223EꢁUP ꢂ°ꢁ to +7ꢂ°ꢁ 2ꢂ TSSOP
2ꢂ Thin QFN-EP*
(ꢀmm x ꢀmm)
MAX3223EꢁTP
ꢂ°ꢁ to +7ꢂ°ꢁ
T2ꢂꢀꢀ-ꢀ
The MAX3221E, MAX3223E, and MAX3243E are avail-
able in space-saving TQFN, SSOP, and TSSOP pack-
ages.
MAX3223EEPP -4ꢂ°ꢁ to +8ꢀ°ꢁ 2ꢂ Plastic DIP
MAX3223EEAP -4ꢂ°ꢁ to +8ꢀ°ꢁ 2ꢂ SSOP
MAX3223EEUP -4ꢂ°ꢁ to +8ꢀ°ꢁ 2ꢂ TSSOP
—
—
—
Applications
2ꢂ Thin QFN-EP*
MAX3223EETP -4ꢂ°ꢁ to +8ꢀ°ꢁ
(ꢀmm x ꢀmm)
T2ꢂꢀꢀ-ꢀ
Notebook, Subnotebook, and Palmtop ꢁomputers
ꢁellular Phones
ꢄatterꢅ-Powered Equipment
ꢃandheld Equipment
Peripherals
* Exposed paddle.
Ordering Information continued at end of data sheet.
ꢁelector Guide
NO. OF
VCC
PART
DRIVERS/
RECEIVERS
RANGE
(V)
AutoShutdown
Printers
MAX3221E
MAX3223E
MAX3243E
1/1
2/2
3/5
+3.0 to +5.5
+3.0 to +5.5
+3.0 to +5.5
ꢀ
ꢀ
ꢀ
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
AutoShutdown and UꢁSP are trademarks of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
ABSOLUTE MAXIMUM RATINGS
V
ꢁꢁ
to GND..............................................................-ꢂ.3V to +6V
16-Pin TSSOP (derate 9.4mW/°ꢁ above +7ꢂ°ꢁ) ........7ꢀ4.7mW
16-Pin TQFN (derate 2ꢂ.8mW/°ꢁ above +7ꢂ°ꢁ) ......1666.7mW
2ꢂ-Pin Plastic DIP (derate 11.11mW/°ꢁ above +7ꢂ°ꢁ)....889mW
2ꢂ-Pin SSOP (derate 8.ꢂꢂmW/°ꢁ above +7ꢂ°ꢁ) ...........64ꢂmW
2ꢂ-Pin TSSOP (derate 1ꢂ.9mW/°ꢁ above +7ꢂ°ꢁ) .........879mW
2ꢂ-Pin TQFN (derate 21.3mW/°ꢁ above +7ꢂ°ꢁ) ......17ꢂ2.1mW
28-Pin SSOP (derate 9.ꢀ2mW/°ꢁ above +7ꢂ°ꢁ)............762mW
28-Pin TSSOP (derate 12.8mW/°ꢁ above +7ꢂ°ꢁ) .......1ꢂ26mW
Operating Temperature Ranges
V+ to GND (Note 1)..................................................-ꢂ.3V to +7V
V- to GND (Note 1) ...................................................+ꢂ.3V to -7V
V+ + |V-| (Note 1) .................................................................+13V
Input Voltages
T_IN, EN, FORꢁEON, FORCEOFF to GND ............-ꢂ.3V to +6V
R_IN to GND ...................................................................... 2ꢀV
Output Voltages
T_OUT to GND................................................................ 13.2V
R_OUT, R2OUTꢄ, INVALID to GND.........-ꢂ.3V to (V
Short-ꢁircuit Duration
T_OUT to GND .........................................................ꢁontinuous
+ ꢂ.3V)
MAX32_ _Eꢁ_ _ ....................................................ꢂ°ꢁ to +7ꢂ°ꢁ
MAX32_ _EE_ _..................................................-4ꢂ°ꢁ to +8ꢀ°ꢁ
Storage Temperature Range.............................-6ꢀ°ꢁ to +16ꢂ°ꢁ
Lead Temperature (soldering, 1ꢂs) .................................+3ꢂꢂ°ꢁ
ꢁꢁ
ꢁontinuous Power Dissipation (T = +7ꢂ°ꢁ)
A
16-Pin SSOP (derate 7.14mW/°ꢁ above +7ꢂ°ꢁ) ...........ꢀ71mW
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
Stresses beꢅond those listed under “Absolute Maximum Ratings” maꢅ cause permanent damage to the device. These are stress ratings onlꢅ, and functional
operation of the device at these or anꢅ other conditions beꢅond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods maꢅ affect device reliabilitꢅ.
ELECTRICAL CHARACTERISTICS
(V
= +3.ꢂV to +ꢀ.ꢀV, ꢁ1–ꢁ4 = ꢂ.1µF (Note 2), T = T
to T
, unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.)
MAX A
ꢁꢁ
A
MIN
PARAMETER
DC CHARACTERISTICS (V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
= 3.3V or ꢀ.ꢂV, T = +2ꢀ°ꢁ)
ꢁꢁ
A
FORꢁEON = GND,
FORCEOFF = V
Supplꢅ ꢁurrent, AutoShutdown
Supplꢅ ꢁurrent, Shutdown
1.ꢂ
1.ꢂ
ꢂ.3
1ꢂ
1ꢂ
1
µA
µA
all R_IN open
ꢁꢁ,
FORCEOFF = GND, all R_IN = GND
Supplꢅ ꢁurrent,
AutoShutdown Disabled
FORꢁEON = FORCEOFF = V
no load
,
ꢁꢁ
mA
LOGIC INPUTS
Input Logic Threshold Low
ꢂ.8
1
V
V
T_IN, EN, FORꢁEON, FORCEOFF
1/MAX243E
V
V
= 3.3V
= ꢀ.ꢂV
2.ꢂ
2.4
ꢁꢁ
T_IN, EN, FORꢁEON,
FORCEOFF
Input Logic Threshold ꢃigh
ꢁꢁ
Transmitter Input ꢃꢅsteresis
Input Leakage ꢁurrent
RECEIVER OUTPUTS
Output Leakage ꢁurrent
Output Voltage Low
ꢂ.ꢀ
V
ꢂ.ꢂ1
µA
T_IN, EN, FORꢁEON, FORCEOFF
R_OUT receivers disabled
ꢂ.ꢂꢀ
1ꢂ
µA
V
I
I
= 1.6mA
= -1.ꢂmA
ꢂ.4
OUT
Output Voltage ꢃigh
V
- ꢂ.6
V
- ꢂ.1
V
OUT
ꢁꢁ
ꢁꢁ
AutoShutdown (FORꢁEON = GND, FORCEOFF = V
)
ꢁꢁ
Positive threshold
Negative threshold
2.7
Receiver Input Threshold to
INVALID Output ꢃigh
Figure ꢀa
Figure ꢀa
V
V
-2.7
-ꢂ.3
Receiver Input Threshold to
INVALID Output Low
ꢂ.3
ꢂ.4
I
I
= 1.6mA
V
V
INVALID Output Voltage Low
INVALID Output Voltage ꢃigh
OUT
= -1.ꢂmA
V
- ꢂ.6
OUT
ꢁꢁ
2
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
1/MAX243E
ELECTRICAL CHARACTERISTICS (continued)
(V
ꢁꢁ
= +3.ꢂV to +ꢀ.ꢀV, ꢁ1–ꢁ4 = ꢂ.1µF (Note 2), T = T
to T
, unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.)
MAX A
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Receiver Positive or Negative
Threshold to INVALID ꢃigh
t
V
ꢁꢁ
V
ꢁꢁ
V
ꢁꢁ
= ꢀV, Figure ꢀb
= ꢀV, Figure ꢀb
= ꢀV, Figure ꢀb
1
µs
INVꢃ
Receiver Positive or Negative
Threshold to INVALID Low
t
3ꢂ
µs
µs
INVL
Receiver or Transmitter Edge to
Transmitters Enabled
t
1ꢂꢂ
WU
RECEIVERINPUTS
-2ꢀ
ꢂ.6
ꢂ.8
2ꢀ
V
Input Voltage Range
V
ꢁꢁ
V
ꢁꢁ
V
ꢁꢁ
V
ꢁꢁ
= 3.3V
= ꢀ.ꢂV
= 3.3V
= ꢀ.ꢂV
1.2
1.ꢀ
1.ꢀ
1.8
ꢂ.ꢀ
ꢀ
Input Threshold Low
Input Threshold ꢃigh
T
T
= +2ꢀ°ꢁ
= +2ꢀ°ꢁ
V
V
A
2.4
2.4
A
Input ꢃꢅsteresis
V
Input Resistance
3
7
kΩ
TRANSMITTER OUTPUTS
All transmitter outputs loaded with
3kΩ to ground
Output Voltage Swing
ꢀ
ꢀ.4
V
Output Resistance
V
ꢁꢁ
= V+ = V- = ꢂ, T
=
OUT
2V
3ꢂꢂ
1ꢂM
Ω
Output Short-ꢁircuit ꢁurrent
6ꢂ
2ꢀ
mA
V
=
12V, V
= ꢂ or 3V to
ꢁꢁ
OUT
Output Leakage ꢁurrent
µA
ꢀ.ꢀV, transmitters disabled
MOUSE DRIVEABILITY (MAX3243E)
T1IN = T2IN = GND, T3IN = V
,
ꢁꢁ
T3OUT loaded with 3kΩ to GND,
T1OUT and T2OUT loaded with
2.ꢀmA each
Transmitter Output Voltage
ꢀ.ꢂ
V
ESD PROTECTION
IEꢁ 1ꢂꢂꢂ-4-2 Air-Gap Discharge
IEꢁ 1ꢂꢂꢂ-4-2 ꢁontact Discharge
ꢃuman ꢄodꢅ Model
1ꢀ
8
kV
R_IN, T_OUT
1ꢀ
_______________________________________________________________________________________
3
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
TIMING CHARACTERISTICS—MAX3221E/MAX3223E/MAX3243E
(V
ꢁꢁ
= +3.ꢂV to +ꢀ.ꢀV, ꢁ1–ꢁ4 = ꢂ.1µF (Note 2), T = T
to T
, unless otherwise noted. Tꢅpical values are at T = +2ꢀ°ꢁ.)
MAX A
A
MIN
PARAMETER
SYMBOL
CONDITIONS
R = 3kΩ, ꢁ = 1ꢂꢂꢂpF,
MIN
TYP
MAX
UNITS
L
L
Maximum Data Rate
2ꢀꢂ
kbps
one transmitter switching
t
t
ꢂ.1ꢀ
ꢂ.1ꢀ
2ꢂꢂ
2ꢂꢂ
1ꢂꢂ
ꢀꢂ
PꢃL
Receiver Propagation Delaꢅ
ꢁ = 1ꢀꢂpF
L
µs
PLꢃ
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Normal operation
Normal operation
(Note 3)
ns
ns
ns
ns
t
t
- t
PꢃL PLꢃ
⏐
⏐
⏐
⏐
Receiver Skew
- t
PꢃL PLꢃ
V
ꢁꢁ
= 3.3V,
R = 3kΩ to 7kΩ,
L
T = +2ꢀ°ꢁ,
measured from +3V
to -3V or
A
ꢁ = 1ꢀꢂpF to
L
1ꢂꢂꢂpF
Transition-Region Slew Rate
6
3ꢂ
V/µs
-3V to +3V, one
transmitter switching
Note 2: ꢁ1–ꢁ4 = ꢂ.1µF, tested at 3.3V 1ꢂ0. ꢁ1 = ꢂ.ꢂ47µF, ꢁ2–ꢁ4 = ꢂ.33µF, tested at ꢀ.ꢂV 1ꢂ0.
Note 3: Transmitter skew is measured at the transmitter zero cross points.
Typical Operating Characteristics
(V
ꢁꢁ
= +3.3V, 2ꢀꢂkbps data rate, ꢂ.1µF capacitors, all transmitters loaded with 3kΩ and ꢁ , T = +2ꢀ°ꢁ, unless otherwise noted.)
L
A
1/MAX243E
MAX3221E/MAX3223E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3221E/MAX3223E
SLEW RATE vs. LOAD CAPACITANCE
6
5
16
14
12
10
8
V
OUT+
4
3
-SLEW
2
T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
1
+SLEW
0
-1
-2
-3
-4
-5
-6
6
4
V
2
OUT-
FOR DATA RATES UP TO 250kbps
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
1/MAX243E
Typical Operating Characteristics (continued)
(V
= +3.3V, 2ꢀꢂkbps data rate, ꢂ.1µF capacitors, all transmitters loaded with 3kΩ and ꢁ , T = +2ꢀ°ꢁ, unless otherwise noted.)
L A
ꢁꢁ
MAX3221E/MAX3223E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3243E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
45
40
35
30
25
20
15
10
5
6
5
V
OUT+
4
250kbps
3
1 TRANSMITTER AT 250kbps
2 TRANSMITTERS AT 15.6kbps
2
120kbps
1
0
-1
-2
-3
-4
-5
-6
20kbps
V
OUT-
T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
MAX3243E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3243E
SLEW RATE vs. LOAD CAPACITANCE
14
12
10
8
60
50
40
30
20
10
0
250kbps
120kbps
6
20kbps
4
T1 TRANSMITTING AT 250kbps
T2 (MAX3223E) TRANSMITTING AT 15.6kbps
2
0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
_______________________________________________________________________________________
5
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
-in Description
PIN
MAX3221E
MAX3223E
DIP/
MAX3243E
FUNCTION
SO/
NAME
SSOP/
THIN
QFN
TQFN
TQFN
SSOP/ SSOP/
TSSOP TSSOP
TSSOP
Receiver Enable Control. Drive low for normal
operation. Drive high to force the receiver outputs
(R_OUT) into a high-impedance state.
14
1
19
1
—
22
EN
Positive terminal of the voltage doubler Charge-Pump
Capacitor
16
15
1
2
3
4
1
20
2
2
3
4
28
27
24
28
27
23
C1+
V+
+5.5V generated by the charge pump
Negative terminal of the voltage doubler Charge-Pump
Capacitor
C1-
2
3
4
5
5
6
7
8
3
4
5
6
1
2
29
30
C2+
C2-
V-
Positive terminal of inverting Charge-Pump Capacitor
Negative terminal of inverting Charge-Pump Capacitor
-5.5V generated by the charge pump
5
7
3
31
7, 14
9, 16
4-8
1-5
R_IN
RS-232 Receiver Inputs
13, 14,
15, 17,
18
6
9
8, 13
10, 15
15-19
21
R_OUT
TTL/CMOS Receiver Outputs
Output of the Valid Signal Detector. INVALID is enabled
high if a valid RS-232 level is present on any receiver
input.
7
8
9
10
11
12
9
11
12, 13
14
—
INVALID
T_IN
12, 13, 10, 11,
10, 11
12
TTL/CMOS Transmitter Inputs
14
12
Drive high to override automatic circuitry keeping
transmitters and charge pump on (FORCEOFF must be
high) (Table 1).
1/MAX243E
23
—
FORCEON
T_OUT
9, 10,
11
10
—
13
—
6, 15
—
8, 17
—
6, 7, 8
19
RS-232 Transmitter Outputs
TTL/CMOS Noninverting Complementary Receiver
Output. Always active.
20
R2OUTB
GND
11
12
14
15
16
17
18
19
25
26
24
26
Ground
V
CC
+3.0V to +5.5V Supply Voltage
Force-Off Input, active low. Drive low to shut down
transmitters, receivers (MAX3243E, except R2OUTB),
and on-board charge pump. This overrides all
automatic circuitry and FORCEON (Table 1).
13
—
16
—
18
—
20
—
22
—
—
FORCEOFF
SHDN
21
Shutdown Control, Active Low
6
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
1/MAX243E
-in Description (continued)
PIN
MAX3221E
MAX3223E
DIP/
MAX3243E
FUNCTION
SO/
SSOP/
THIN
QFN
TQFN
TQFN
SSOP/ SSOP/
TSSOP TSSOP
NAME
TSSOP
Noninverting Complementary Receiver Outputs.
Always active.
—
—
EP
—
—
—
—
—
EP
—
—
—
—
—
—
19, 20
R_OUTB
N.C.
9, 16,
25, 32
No Connection. Not internally connected.
Exposed Paddle. Solder the exposed paddle to the
ground plane or leave unconnected.
EP
GND
_______________Detailed Description
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
Dual Chargeꢂ-ump koltage Converter
The MAX3221E/MAX3223E/MAX3243E’s internal power
supplꢅ consists of a regulated dual charge pump that
provides output voltages of +ꢀ.ꢀV (doubling charge
pump) and -ꢀ.ꢀV (inverting charge pump), over the
+3.ꢂV to +ꢀ.ꢀV V
range. The charge pumps operate
ꢁꢁ
MAX3243E
in discontinuous mode: if the output voltages are less
than ꢀ.ꢀV, the charge pumps are enabled; if the output
voltages exceed ꢀ.ꢀV, the charge pumps are disabled.
Each charge pump requires a flꢅing capacitor (ꢁ1, ꢁ2)
and a reservoir capacitor (ꢁ3, ꢁ4) to generate the V+
and V- supplies.
Rꢁꢂ232 Transmitters
The transmitters are inverting level translators that con-
vert ꢁMOS-logic levels to ꢀ.ꢂV EIA/TIA-232 levels. Theꢅ
guarantee a 2ꢀꢂkbps data rate with worst-case loads
of 3kΩ in parallel with 1ꢂꢂꢂpF, providing compatibilitꢅ
with Pꢁ-to-Pꢁ communication software such as
LapLink™. Transmitters can be paralleled to drive mul-
tiple receivers. The MAX3243E has been specificallꢅ
designed to drive serial mice. Figure 1 shows a com-
plete sꢅstem connection. When FORCEOFF is driven to
ground, or the AutoShutdown circuitrꢅ senses invalid
voltage levels on all receiver inputs, the transmitters are
disabled and the outputs are forced into a high-imped-
ance state. When powered off or shut down, the output
can be driven up to 12V. The transmitter inputs do not
have pull-up resistors.
I/O
CHIP
WITH
UART
CPU
RS-232
Figure 1. Interface Under ꢁontrol of PMU
LapLink is a trademark of Traveling Software.
_______________________________________________________________________________________
7
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
Rꢁꢂ232 Receivers
V
CC
The MAX3221E/MAX3223E/MAX3243E’s receivers con-
vert RS-232 signals to ꢁMOS-logic output levels. All
receivers have inverting three-state outputs and can be
active or inactive. In shutdown (FORCEOFF = low) or in
AutoShutdown, the MAX3221E/MAX3223E’s receivers
are active (Table 1). Drive EN high to place the receiv-
er(s) in a high-impedance state. The MAX3243E’s
receivers are high-impedance when the part is in shut-
down (FORCEOFF = low).
PROTECTION
DIODE
PREVIOUS
RS-232
V
CC
I
Rx
Tx
The MAX3243E features an extra, alwaꢅs-active com-
plementarꢅ output (R2OUTꢄ). R2OUTꢄ monitors
receiver activitꢅ while the other receivers are high-
impedance. This allows Ring Indicator to be monitored
without forward biasing other devices connected to the
5kΩ
UART
GND
SHDN = GND
receiver outputs. This is ideal for sꢅstems where V
ꢁꢁ
drops to ꢂ in shutdown to accommodate peripherals
such as UARTs (Figure 2).
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE
The MAX3221E/MAX3223E/MAX3243E feature an
INVALID output that is enabled low when no valid RS-232
signal levels have been detected on all receiver inputs.
INVALID is functional in anꢅ mode (Figures 3 and ꢀ).
RECEIVER OUTPUT IN SHUTDOWN.
V
CC
TO
μP
LOGIC
TRANSITION
DETECTOR
Autoꢁhutdown
The MAX3221E/MAX3223E/MAX3243E achieve a 1µA
supplꢅ current with Maxim’s new AutoShutdown fea-
ture, which operates when FORꢁEON is low and
FORCEOFF is high. When these devices sense no valid
signal levels on all receiver inputs for 3ꢂµs, the on-
board charge pump and drivers are shut off, reducing
supplꢅ current to 1µA. This occurs if the RS-232 cable
is disconnected or the connected peripheral transmit-
ters are turned off. The device turns on again when a
valid level is applied to anꢅ RS-232 receiver input. As a
result, the sꢅstem saves power without changes to the
existing ꢄIOS or operating sꢅstem.
Table 2 and Figure 3c summarize the MAX3221E/
MAX3223E/MAX3243E operating modes. FORꢁEON
and FORCEOFF override AutoShutdown. When neither
control is asserted, the Iꢁ selects between these states
automaticallꢅ, based on receiver input levels. Figures
3a, 3b, and ꢀa depict valid and invalid RS-232 receiver
levels. Figure ꢀ shows the input levels and timing dia-
gram for AutoShutdown operation.
I
MAX3243E
PROTECTION
DIODE
R2OUTB
V
CC
1/MAX243E
R2IN
Rx
R2OUT
THREE-STATED
UART
5kΩ
T1OUT
T1IN
Tx
GND
FORCEOFF = GND
b) NEW MAX3243E: IN SHUTDOWN, R2OUTB IS USED TO MONITOR EXTERNAL
DEVICES AND R2OUT IS THREE STATED, ELIMINATING A CURRENT PATH
THROUGH THE UART'S PROTECTION DIODE.
Figure 2. The MAX3243E detects RS-232 activitꢅ when the
UART and interface are shut down.
8
_______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
1/MAX243E
Table 1. Output Control Truth Table
VALID
RECEIVER
LEVEL
R_OUT
(MAX3221E/
MAX3223E)
EN
OPERATION
STATUS
R_OUT
(MAX3243E) (MAX3243E)
R2OUTB
FORCEON
(MAX3221E/
MAX3223E)
T_OUT
FORCEOFF
X
X
1
1
ꢂ
ꢂ
ꢂ
ꢂ
ꢂ
ꢂ
1
1
1
1
1
1
ꢂ
1
ꢂ
1
ꢂ
1
ꢂ
1
X
X
ꢃigh-Z
ꢃigh-Z
Active
Active
Active
Active
ꢃigh-Z
ꢃigh-Z
Active
ꢃigh-Z
Active
ꢃigh-Z
Active
ꢃigh-Z
Active
ꢃigh-Z
ꢃigh-Z
ꢃigh-Z
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Shutdown
(Forced Off)
X
Normal Operation
(Forced On)
X
Yes
Yes
No
No
Normal Operation
(AutoShutdown)
Shutdown
(AutoShutdown)
X = Don’t ꢁare
+2.7V
+0.3V
TO MAX32_ _E
POWER SUPPLY
AND TRANSMITTERS
TO MAX32_ _E
POWER SUPPLY
R_IN
-2.7V
R_IN
-0.3V
30μs
COUNTER
R
30μs
COUNTER
R
INVALID
INVALID
*TRANSMITTERS ARE ENABLED IF:
ANY RECEIVER INPUT IS GREATER THAN +2.7V OR LESS THAN -2.7V.
ANY RECEIVER INPUT HAS BEEN BETWEEN +0.3V AND -0.3V FOR LESS THAN 30μs.
* TRANSMITTERS ARE DISABLED, REDUCING SUPPLY CURRENT TO 1μA IF
ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30μs.
Figure 3b. MAX32_ _E with Transmitters Enabled Using
AutoShutdown
Figure 3a. MAX32_ _E Entering 1µA Supplꢅ Mode via
AutoShutdown
A mouse or other sꢅstem with AutoShutdown maꢅ need
time to wake up. Figure 4 shows a circuit that forces
the transmitters on for 1ꢂꢂms, allowing enough time for
the other sꢅstem to realize that the MAX3221E/
MAX3223E/ MAX3243E are awake. If the other sꢅstem
transmits valid RS-232 signals within that time, the RS-
232 ports on both sꢅstems remain enabled.
1ꢀ5k EꢁD -rotection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assemblꢅ.
The driver outputs and receiver inputs of the
MAX3221E/MAX3223E/MAX3243E have extra protection
against static electricitꢅ. Maxim’s engineers have devel-
oped state-of-the-art structures to protect these pins
against ESD of 1ꢀkV without damage. The ESD struc-
tures withstand high ESD in all states: normal operation,
shutdown, and powered down. After an ESD event,
Maxim’s E versions keep working without latchup,
whereas competing RS-232 products can latch and
must be powered down to remove latchup. See Table 4.
When shut down, the device’s charge pumps are off,
V+ is pulled to V , V- is pulled to ground, and the
ꢁꢁ
transmitter outputs are high impedance. The time
required to exit shutdown is tꢅpicallꢅ 1ꢂꢂµs (Figure ꢀb).
ꢁoftwareꢂControlled ꢁhutdown
If direct software control is desired, INVALID can be
used to indicate DTR or Ring Indicator signal. ꢁonnect
FORCEOFF and FORꢁEON together to disable Auto-
Shutdown so the line acts like a SHDN input.
_______________________________________________________________________________________
9
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
FORCEOFF
Table 2. INVALID Truth Table
POWER DOWN
FORCEON
RS-232 SIGNAL PRESENT
AT ANY RECEIVER INPUT
INVALID OUTPUT
INVALID
INVALID IS AN INTERNALLY GENERATED SIGNAL
THAT IS USED BY THE AUTOSHUTDOWN LOGIC
AND APPEARS AS AN OUTPUT OF THE DEVICE.
Yes
No
ꢃigh
Low
POWER DOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 3c. MAX32_ _E AutoShutdown Logic
TRANSMITTERS ENABLED, INVALID HIGH
+2.7V
POWER-
MASTER SHDN LINE
MANAGEMENT
INDETERMINATE
0.1μF
1MΩ
UNIT
+0.3V
0
AUTOSHUTDOWN, TRANSMITTERS DISABLED,
FORCEOFF FORCEON
1μA SUPPLY CURRENT, INVALID LOW
-0.3V
MAX3221E
MAX3223E
MAX3243E
INDETERMINATE
-2.7V
TRANSMITTERS ENABLED, INVALID HIGH
Figure 4. AutoShutdown with Initial Turn-On to Wake Up a
Mouse or Another Sꢅstem
a)
ESD protection can be tested in various waꢅs; the trans-
mitter outputs and receiver inputs of this product familꢅ
are characterized for protection to the following limits:
1) 1ꢀkV using the ꢃuman ꢄodꢅ Model
2) 8kV using the ꢁontact Discharge Method specified
in IEꢁ1ꢂꢂꢂ-4-2
RECEIVER
INPUT
VOLTAGE
(V)
1/MAX243E
INVALID
REGION
3) 1ꢀkV using IEꢁ1ꢂꢂꢂ-4-2’s Air-Gap Method
ESD Test Conditions
ESD performance depends on a varietꢅ of conditions.
ꢁontact Maxim for a reliabilitꢅ report that documents
test setup, test methodologꢅ, and test results.
V
CC
0
INVALID
OUTPUT
(V)
Human Body Model
Figure 6a shows the ꢃuman ꢄodꢅ Model, and Figure
6b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
1ꢂꢂpF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.ꢀkΩ resistor.
t
t
INVH
INVL
t
WU
V+
V
CC
0
V-
IEC1000-4-2
The IEꢁ1ꢂꢂꢂ-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specificallꢅ
refer to integrated circuits. The MAX3221E/ MAX3223E/
MAX3243E help ꢅou design equipment that meets
b)
Figure ꢀ. AutoShutdown Trip Levels
10 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
1/MAX243E
R
1MΩ
R 1500Ω
D
C
R
50MΩ to 100MΩ
R 330Ω
D
C
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
CHARGE CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
DEVICE
UNDER
TEST
C
s
100pF
STORAGE
CAPACITOR
C
s
150pF
STORAGE
CAPACITOR
SOURCE
SOURCE
Figure 7a. IEꢁ1ꢂꢂꢂ-4-2 ESD Test Model
Figure 6a. ꢃuman ꢄodꢅ ESD Test Models
I
100%
I
P
100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
90%
AMPERES
36.8%
10%
0
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
10%
= 0.7ns to 1ns
t
Figure 6b. ꢃuman ꢄodꢅ Model ꢁurrent Waveform
r
t
30ns
60ns
Level 4 (the highest level) of IEꢁ1ꢂꢂꢂ-4-2, without the
need for additional ESD-protection components.
Figure 7b. IEꢁ1ꢂꢂꢂ-4-2 ESD Generator ꢁurrent Waveform
The major difference between tests done using the
ꢃuman ꢄodꢅ Model and IEꢁ1ꢂꢂꢂ-4-2 is higher peak
current in IEꢁ1ꢂꢂꢂ-4-2, because series resistance is
lower in the IEꢁ1ꢂꢂꢂ-4-2 model. ꢃence, the ESD with-
stand voltage measured to IEꢁ1ꢂꢂꢂ-4-2 is generallꢅ
lower than that measured using the ꢃuman ꢄodꢅ
Model. Figure 7a shows the IEEE1ꢂꢂꢂ-4-2 model and
Figure 7b shows the current waveform for the 8kV
IEꢁ1ꢂꢂꢂ-4-2 Level 4 ESD contact-discharge test.
Therefore, after Pꢁ board assemblꢅ, the Machine Model
is less relevant to I/O ports.
___________Applications Information
Capacitor ꢁelection
The capacitor tꢅpe used for ꢁ1–ꢁ4 is not critical for
proper operation; either polarized or nonpolarized
capacitors maꢅ be used. The charge pump requires
ꢂ.1µF capacitors for 3.3V operation. For other supplꢅ
voltages, refer to Table 3 for required capacitor values.
Do not use values smaller than those listed in Table 3.
Increasing the capacitor values (e.g., bꢅ a factor of 2)
reduces ripple on the transmitter outputs and slightlꢅ
reduces power consumption. ꢁ2, ꢁ3, and ꢁ4 can be
increased without changing ꢁ1’s value. However, do
not increase C1 without also increasing the values of
C2, C3, and C4 to maintain the proper ratios (C1 to
the other capacitors).
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method connects
the probe to the device before the probe is energized.
Machine Model
The Machine Model for ESD tests all pins using a 2ꢂꢂpF
storage capacitor and zero discharge resistance. Its
objective is to emulate the stress caused bꢅ contact that
occurs with handling and assemblꢅ during manufactur-
ing. Of course, all pins require this protection during
manufacturing, not just RS-232 inputs and outputs.
______________________________________________________________________________________ 11
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
When using the minimum required capacitor values,
Table 3. Required Capacitor Values
make sure the capacitor value does not degrade exces-
V
(V)
C1, C
C2, C3, C4
(µF)
BYPASS
CC
sivelꢅ with temperature. If in doubt, use capacitors with a
larger nominal value. The capacitor’s equivalent series
resistance (ESR) usuallꢅ rises at low temperatures and
influences the amount of ripple on V+ and V-.
(µF)
ꢂ.22
ꢂ.1
3.ꢂ to 3.6
3.1ꢀ to 3.6
4.ꢀ to ꢀ.ꢀ
3.ꢂ to ꢀ.ꢀ
ꢂ.22
ꢂ.1
ꢂ.33
1
ꢂ.ꢂ47
ꢂ.22
-owerꢂꢁupply Decoupling
In most circumstances, a ꢂ.1µF V
bꢅpass capacitor is
ꢁꢁ
adequate. In applications that are sensitive to power-
supplꢅ noise, use a capacitor of the same value as the
charge-pump capacitor ꢁ1. ꢁonnect bꢅpass capacitors
as close to the Iꢁ as possible.
FORCEON =
FORCEOFF
T2OUT
5V/div
Transmitter Outputs
when Exiting ꢁhutdown
Figure 8 shows two transmitter outputs when exiting
shut down mode. As theꢅ become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (one transmitter output is high, the other is low).
Each transmitter is loaded with 3kΩ in parallel with
1ꢂꢂꢂpF. The transmitter outputs displaꢅ no ringing or
undesirable transients as theꢅ come out of shutdown,
and are enabled onlꢅ when the magnitude of V-
exceeds approximatelꢅ -3V.
2V/div
T1OUT
V
= 3.3V
CC
C1–C4 = 0.1μF
40μs/div
High Data Rates
The MAX3221E/MAX3223E/MAX3243E maintain the RS-
232 ꢀ.ꢂV minimum transmitter output voltage even at
high data rates. Figure 9 shows a transmitter loopback
test circuit. Figure 1ꢂ shows a loopback test result at
12ꢂkbps, and Figure 11 shows the same test at 2ꢀꢂkbps.
For Figure 1ꢂ, all three transmitters were driven simulta-
neouslꢅ at 12ꢂkbps into RS-232 loads in parallel with
1ꢂꢂꢂpF. For Figure 11, a single transmitter was driven at
2ꢀꢂkbps, and all three transmitters were loaded with an
RS-232 receiver in parallel with 1ꢂꢂꢂpF.
Figure 8. Transmitter Outputs Exiting Shutdown or Powering Up
as Logitech and Microsoft. When tested, the MAX3243E
successfullꢅ drove all serial mice and met their respective
current and voltage requirements. The MAX3243E’s regu-
lated dual charge pump ensures the transmitters will sup-
plꢅ at least ꢀV during worst-case conditions. Figure 12a
shows the transmitter outputs under increasing load cur-
rent. The AutoShutdown feature does not work with a
mouse, so FORCEOFF and FORꢁEON should be con-
1/MAX243E
nected to V . Figure 12b (on the following page) shows
ꢁꢁ
a mouse driver test circuit. To achieve mouse driveabilitꢅ
with 1µA supplꢅ current when the port is inactive, use
parts with the AutoShutdown Plus™ feature (such as the
MAX3244E and MAX324ꢀE).
Mouse Driveability (MAX3243E)
The MAX3243E has been specificallꢅ designed to power
serial mice while operating from low-voltage power sup-
plies. It has been tested with leading mouse brands such
AutoShutdown Plus is a trademark of Maxim Integrated Products, Inc.
12 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
1/MAX243E
Table 4. 15kV ESD-Protected, 3.0V to 5.5V Powered RS-232 Transceivers from Maxim
SUPPLY
VOLTAGE
RANGE
(V)
HUMAN IEC 1000-4-2 IEC 1000-4-2
BODY CONTACT AIR-GAP
MODEL DISCHARGE DISCHARGE
NO. SUPPLY
OF CURRENT Shutdown Shutdown
Auto-
Auto-
GUARANTEED
DATA RATE
(kbps)
PART
Tx/Rx
(µA)
Plus
(kV)
(kV)
(kV)
MAX3241E +3.ꢂ to +ꢀ.ꢀ
MAX3243E +3.ꢂ to +ꢀ.ꢀ
MAX3244E +3.ꢂ to +ꢀ.ꢀ
MAX324ꢀE +3.ꢂ to +ꢀ.ꢀ
MAX3232E +3.ꢂ to +ꢀ.ꢀ
MAX3222E +3.ꢂ to +ꢀ.ꢀ
MAX3223E +3.ꢂ to +ꢀ.ꢀ
MAX3224E +3.ꢂ to +ꢀ.ꢀ
MAX322ꢀE +3.ꢂ to +ꢀ.ꢀ
MAX3221E +3.ꢂ to +ꢀ.ꢀ
MAX3226E +3.ꢂ to +ꢀ.ꢀ
MAX3227E +3.ꢂ to +ꢀ.ꢀ
3/ꢀ
3/ꢀ
3/ꢀ
3/ꢀ
2/2
2/2
2/2
2/2
2/2
1/1
1/1
1/1
3ꢂꢂ
1
—
—
—
Yes
—
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
8
8
8
8
8
8
8
8
8
8
8
8
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
1ꢀ
2ꢀꢂ
2ꢀꢂ
1
Yes
Yes
—
2ꢀꢂ
1
—
1Mbps
2ꢀꢂ
3ꢂꢂ
3ꢂꢂ
1
—
—
—
2ꢀꢂ
—
Yes
—
2ꢀꢂ
1
Yes
Yes
—
2ꢀꢂ
1
—
1Mbps
2ꢀꢂ
1
Yes
—
1
Yes
Yes
2ꢀꢂ
1
—
1Mbps
V
CC
0.1μF
5V/div
5V/div
5V/div
T1IN
V
CC
C1+
V+
V-
C3
C4
C1
C1-
C2+
MAX3221E
MAX3223E
MAX3243E
T1OUT
R1OUT
C2
C2-
T_ OUT
R_ IN
5kΩ
T_ IN
V
= 3.3V
CC
2μs/div
R_ OUT
EN (MAX3221E/3E)
Figure 1ꢂ. Loopback Test Result at 12ꢂkbps
0
1000pF
V
CC
FORCEOFF
GND
Figure 9. Loopback Test ꢁircuit
______________________________________________________________________________________ 13
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
6
5
V
4
3
5V/div
5V/div
5V/div
OUT+
T1IN
T1OUT
R1OUT
V
= 3.0V
CC
2
V
V
1
OUT+
OUT-
0
-1
-2
-3
-4
-5
-6
V
CC
1
V
OUT-
9
V
= 3.3V
CC
0
2
3
4
5
6
7
8
10
2μs/div
LOAD CURRENT PER TRANSMITTER (mA)
Figure 11. Loopback Test Result at 2ꢀꢂkbps
Figure 12a. Transmitter Output Voltage vs. Load ꢁurrent per
Transmitter
Table 5. Logic Family Compatibility with
Various Supply Voltages
Ordering Information (continued)
SYSTEM
TEMP
RANGE
PIN-
PACKAGE
PKG
CODE
PART
POWER-
SUPPLY
VOLTAGE
(V)
V
CC
SUPPLY
VOLTAGE
(V)
COMPATIBILITY
MAX3243EꢁWI ꢂ°ꢁ to +7ꢂ°ꢁ 28 Wide SO
—
—
—
—
—
—
MAX3243EꢁAI
MAX3243EꢁUI
ꢂ°ꢁ to +7ꢂ°ꢁ 28 SSOP
ꢂ°ꢁ to +7ꢂ°ꢁ 28 TSSOP
MAX3243EEWI -4ꢂ°ꢁ to +8ꢀ°ꢁ 28 Wide SO
MAX3243EEAI -4ꢂ°ꢁ to +8ꢀ°ꢁ 28 SSOP
MAX3243EEUI -4ꢂ°ꢁ to +8ꢀ°ꢁ 28 TSSOP
ꢁompatible with all ꢁMOS
families.
3.3
ꢀ
3.3
ꢀ
ꢁompatible with all TTL and
ꢁMOS-logic families.
1/MAX243E
ꢁompatible with AꢁT and
ꢃꢁT ꢁMOS, and with TTL.
Incompatible with Aꢁ, ꢃꢁ,
or ꢁD4ꢂꢂꢂ ꢁMOS.
32 Thin QFN-EP
(7mm x 7mm)*
MAX3243EꢁTJ
ꢂ°ꢁ to +7ꢂ°ꢁ
T3277-2
T3277-2
ꢀ
3.3
32 Thin QFN-EP
(7mm x 7mm)*
MAX3243EETJ -4ꢂ°ꢁ to +8ꢀ°ꢁ
*Exposed paddle.
Interconnection with 3k and ꢀk Logic
The MAX3221E/MAX3223E/MAX3243E can directlꢅ
interface with various ꢀV logic families, including AꢁT
and xꢃꢁT ꢁMOS. See Table ꢀ for more information on
possible combinations of interconnections.
___________________Chip Information
MAX3221E TRANSISTOR ꢁOUNT: 269
MAX3223E TRANSISTOR ꢁOUNT: 339
MAX3243E TRANSISTOR ꢁOUNT: 476
PROꢁESS: ꢄiꢁMOS
14 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
1/MAX243E
+3.3V
26
0.1μF
V
CC
27
3
28
C1+
V+
C1
0.1μF
C3
0.1μF
24
1
C1-
C2+
COMPUTER SERIAL PORT
MAX3243E
V-
C4
C2
0.1μF
0.1μF
2
C2-
+V
+V
-V
T1IN
T1OUT
9
14
T2IN
T3IN
LOGIC
INPUTS
T2OUT 10
13
12
11
T3OUT
GND
Tx
R2OUTB
20
R1OUT
R2OUT
R3OUT
R1IN
4
5
19
18
17
5kΩ
R2IN
5kΩ
R3IN
5kΩ
LOGIC
OUTPUTS
6
7
8
RS-232
INPUTS
R4OUT
R5OUT
16
R4IN
5kΩ
5kΩ
SERIAL
MOUSE
15
23
R5IN
FORCEON
FORCEOFF
INVALID
V
CC
CC
22
21
V
TO POWER-
MANAGEMENT
UNIT
GND
25
Figure 12b. Mouse Driver Test ꢁircuit
______________________________________________________________________________________ 15
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
Typical Operating Circuits
+3.3V
15
0.1μF
C
BYPASS
V
CC
3
7
2
C1+
V+
V-
C1
C3
0.1μF
4
5
6
0.1μF
C1-
C2+
MAX3221E*
+3.3V
0.1μF
C4
0.1μF
26
C2
0.1μF
C
BYPASS
C2-
V
CC
27
3
28
C1+
V+
11
9
T1IN
C1
0.1μF
T1OUT 13
C3
0.1μF
24
1
C1-
C2+
R1OUT
R1IN
5kΩ
8
MAX3243E
V-
C4
0.1μF
C2
0.1μF
2
C2-
T1IN
T1OUT
9
14
TO POWER-
MANAGEMENT
UNIT
EN
INVALID 10
1
RS-232
OUTPUTS
T2IN
T3IN
LOGIC
INPUTS
T2OUT 10
13
12
FORCEOFF
FORCEON
16
12
V
CC
11
T3OUT
GND
14
R2OUTB
R1OUT
20
19
+3.3V
R1IN
5kΩ
4
5
19
0.1μF
C
BYPASS
V
CC
3
7
2
C1+
V+
V-
R2OUT
R3OUT
R4OUT
R2IN
18
17
16
C1
0.1μF
C3
0.1μF
4
5
6
C1-
C2+
5kΩ
R3IN
5kΩ
MAX3223E**
LOGIC
OUTPUTS
1/MAX243E
C4
0.1μF
6
7
8
RS-232
INPUTS
C2
0.1μF
C2-
13
T1IN
T1OUT 17
R4IN
TTL/CMOS
INPUTS
RS-232
OUTPUTS
5kΩ
8
T2IN
T2OUT
12
R5OUT
15
23
R5IN
16
15 R1OUT
R1IN
5kΩ
FORCEON
FORCEOFF
INVALID
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5kΩ
22
21
V
CC
R2IN
10 R2OUT
9
TO POWER-
MANAGEMENT UNIT
5kΩ
GND
25
TO POWER-
MANAGEMENT
UNIT
EN
INVALID 11
1
*MAX3221E PIN OUT REFERS TO SSOP/TSSOP PACKAGES.
**MAX3223E PIN OUT REFERS TO DIP/SSOP/TSSOP PACKAGES.
FORCEOFF
FORCEON
20
14
V
CC
GND
18
16 ______________________________________________________________________________________
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
1/MAX243E
-in Configurations
TOP VIEW
EN
C1+
V+
EN
16 FORCEOFF
FORCEOFF
1
2
3
4
5
6
7
8
1
2
20
19
18
17
16
15
14
13
12
11
15
V
V
C1+
V+
CC
CC
14
GND
GND
3
C1-
C1-
C2+
C2-
V-
13 T1OUT
MAX3221E
T1OUT
R1IN
4
MAX3223E
C2+
C2-
FORCEON
12
5
11 T1IN
10 INVALID
R1OUT
FORCEON
T1IN
6
V-
7
T2OUT
9
R1IN
R1OUT
8
R2IN
T2IN
9
SSOP/TSSOP
R2OUT
INVALID
10
DIP/SSOP/TSSOP
TOP VIEW
C2+
C2-
C1+
V+
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
24 23 22 21 20 19 18 17
V-
V
3
CC
R1IN
R2IN
R3IN
R4IN
R5IN
T1OUT
T2OUT
T3OUT
T3IN
T2IN
T1IN
GND
4
16
N.C.
N.C. 25
C1-
V
5
CC 26
V+ 27
15 R3OUT
14 R4OUT
13 R5OUT
MAX3243E
FORCEON
FORCEOFF
INVALID
R2OUTB
R1OUT
R2OUT
R3OUT
R4OUT
R5OUT
6
7
C1+ 28
MAX3243E
8
C2+ 29
C2- 30
V- 31
12 T1IN
11 T2IN
10 T3IN
9
10
11
12
13
14
N.C. 32
9
N.C.
1
2
3
4
5
6
7
8
SO/SSOP/TSSOP
TQFN
______________________________________________________________________________________ 17
1ꢀ5k EꢁDꢂ-rotected, 1µA, 3.0k to ꢀ.ꢀk, 2ꢀ05bps,
Rꢁꢂ232 Transceivers with Autoꢁhutdown
-in Configurations (continued)
TOP VIEW
12
11
10
9
15
14
13
12
11
T2IN
10
9
GND 16
VCC 17
T1IN
8
7
6
5
FORCEOFF 13
EN 14
INVALID
INVALID
R1OUT
R1IN
8
FORCEOFF 18
R2OUT
R2IN
MAX3221E*
MAX3223E*
V+
15
16
EN
V+
7
19
20
C1+
6
T2OUT
1
2
3
4
1
2
3
4
5
TQFN
TQFN
* EP = EXPOSED PADDLE
* EP = EXPOSED PADDLE
1/MAX243E
Maxim cannot assume responsibilitꢅ for use of anꢅ circuitrꢅ other than circuitrꢅ entirelꢅ embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitrꢅ and specifications without notice at anꢅ time.
18 ____________________Maxim Integrated -roducts, 120 ꢁan Gabriel Drive, ꢁunnyvale, CA 94086 408ꢂ737ꢂ7600
© 2ꢂꢂꢀ Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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