ETC2 MAX3222E/3232E High esd-protected, low power, 3.0v to 5.5v, single supply rs-232 transceiver Datasheet

Anasys Semiconductor, Inc.
MAX3222E/3232E
High ESD-Protected, Low Power, 3.0V to 5.5V,
Single Supply RS-232 Transceivers
General Description
The MAX3222E/M AX3232E are 2 driver, 2 receiver RS-232 transceiver solutions intended for
portable or hand-held applications, features low power consumption, high data-rate capabilities,
and enhanced ESD protection. The ESD tolerance of the MAX3222E/3232E devices is over
±15kV for both human body model and IEC1000-4-2 air discharge test methods.
A low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V
power supply, using an internal dual charge pump. The charge pump requires only four small
0.1µF capacitors for operation from a +3.3V supply. Each device guarantees operation at data
rates of 250kbps while maintaining RS-232 output levels.
The MAX3222E features a 1µA shutdown mode that reduces power consumption in
battery-powered portable systems. The M AX3222E receivers remain active in shutdown mode,
allowing monitoring of external devices while consuming only 1µA of supply current. The
M AX3222E and MAX3232E are pin, package, and functionally compatible with the
industry-standard M AX242 and MAX232, respectively.
Applications
Notebook, Sub notebook, and Palmtop Computers
Battery-Powered / Hand-Held Equipment
POS terminal / Intelligent Network Switch
DMM / Printers
Smart Phones
xDSL Modems
Features
Meets true EIA/TIA-232-F Standards from a +3.0V to +5.5V power supply
Interoperable with EIA/TIA - 232 and adheres to EIA/TIA - 562
1µA Low-Power Shutdown (MAX3222E)
Enhanced ESD Specifications:
15kV Human Body Model
15kV IEC1000-4-2 Air Discharge
8kV IEC1000-4-2 Contact Discharge
250 kbps Minimum Transmission Rate
Ideal for Handheld, Battery Operated Applications
Latch up Free
Guaranteed 30V/µs Max Slew Rate
BiCMOS Technology
MAX3222/3232 Datasheet Rev. 0.1 , Sept 2005
Page 1 of 7
Anasys Semiconductor, Inc.
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX3222EEUP -40°C to +85°C
20 TSSOP
MAX3222EEAP -40°C to +85°C
20 SSOP
MAX3222EEPN -40°C to +85°C
18 Plastic DIP
MAX3232EEAE
-40°C to +85°C
16 SSOP
MAX3232EESE
-40°C to +85°C
16 Narrow SO
MAX3232EEPE
-40°C to +85°C
16 Plastic DIP
MAX3232EEUP
-40°C to +85°C
20 TSSOP
Absolute Maximum Ratings
Ratings
Range
Units
VCC to GND
-0.3 to +6
V
V+ to GND
-0.3 to +7
V
V- to GND
-0.3 to +7
V
V+ to V-
13
V
-0.3 to +6
V
±25
V
T_OUT to GND
±13.2
V
R_OUT to GND
-0.3 to (VCC+0.3 )
V
Short-Circuit Duration, T_OUT
Continuous
Power Supply
Input Voltages
T_IN, EN , SHDN
R_IN to GND
Output Voltages
Continuous Power Dissipation (TA = +70°C)
16-Pin DIP (derate 10.53mW/°C above +70°C)
842
mW
16-Pin NSO (derate 8.70mW/°C above +70°C)
696
mW
16-Pin SSOP (derate 7.14 mW/°C above +70°C)
571
mW
20-Pin TSSOP (derate 10.9 mW/°C above +70°C)
879
mW
20-Pin SSOP (derate 8.00 mW/°C above +70°C)
640
mW
Operating Temperature Ranges
MAX32__EC__
MAX32__EE__
Storage Temperature Range
0 to 70
-40 to +85
-65 to +165
°C
°C
°C
Lead
300
°C
Temperature
(soldering,
10sec)
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.
MAX3222/3232 Datasheet Rev. 0.1 , Sept 2005
Page 2 of 7
Anasys Semiconductor, Inc.
Pin Description
PIN
MAX3222E
SO/DIP TSSOP/SSOP
MAX3232E
SO/DIP/SSOP TSSOP
NAME
FUNCTION
Receiver Enable. Active low.
1
1
—
—
EN
2
2
1
2
C1+
3
3
2
3
V+
4
4
3
4
C1-
5
5
4
5
C2+
6
6
5
6
C2-
Negative Terminal of Inverting
Charge-Pump Capacitor
7
7
6
7
V-
-5.5V Generated by the
Charge Pump
8, 15
8, 17
7, 14
8, 17
T_OUT
RS-232 Transmitter Outputs
9, 14
9, 16
8, 13
9, 16
R_IN
RS-232 Receiver Inputs
10, 13
10, 15
9, 12
12, 15
R_OUT
TTL/CMOS Receiver Outputs
11, 12
12, 13
10, 11
13, 14
T_IN
TTL/CMOS Transmitter Inputs
16
18
15
18
GND
Ground
17
19
16
19
VCC
+3.0V to +5.5V Supply
Voltage
18
20
—
—
SHDN
Shutdown Control. Active low.
MAX3222/3232 Datasheet Rev. 0.1 , Sept
Positive Terminal of
Voltage-Doubler
Charge-Pump Capacitor
+5.5V Generated by the
Charge Pump
Negative Terminal of
Voltage-Doubler
Charge-Pump Capacitor
Positive Terminal of Inverting
Charge-Pump Capacitor
Page 3 of 7
Anasys Semiconductor, Inc.
Electrical Characteristics
(VCC = +3V to +5.5V, C1-C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.)
Parameter
Symbol
Conditions
Min
DC Characteristics (VCC = +3.3V or +5.5V, TA = +25°C )
VCC Supply Current
Shutdown
Current
Supply
Typ
Max
Units
ICC
SHDN = VCC
Load, TA=+25°C
,No
0.3
1
mA
ISHDN
SHDN =GND,
Load, TA=+25°C
No
1
10
µA
Logic
Input
Current
Leakage
T_IN, SHDN , EN
±1
µA
0.8
V
Input Threshold Low
VIL
T_IN, SHDN , EN
Input Threshold High
VIH
Output Voltage Low
Output Voltage High
VOH
VOL
T_IN, SHDN , EN
R_OUT; IOUT=3.2mA
R_OUT; IOUT=-1.0mA
2.0
VCC-0.6
V
0.4
V
V
25
V
V
V
V
kΩ
VCC-0.1
EIA/TIA-232E Receiver Inputs
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
TA=+25°C, VCC= 3.3V
TA=+25°C, VCC= 3.3V
VCC= 3.3V
TA=+25°C, VCC= 3.3V
-25
0.6
1.1
1.5
2.4
0.2
7
0.1
3
5
±5
±5.4
V
300
500
Ω
EIA/TIA-232E Transmitter Outputs
All drivers loaded with
3kΩ to ground
Output
Voltage
Swing
Output Resistance
Output Short Circuit
Current
±60
mA
TIMING CHARACTERISTICS
RL=3 kΩ to 7 kΩ, CL=
50pF to 1000pF, one
transmitter switching
Maximum Data Rate
Receiver Propagation
Delay
Transmitter
Propagation Delay
tPLHR,
tPHLR
tPLHT,
tPHLT
Transition-Region
Slew rate
250
CL= 150pF
RL=3 kΩ, CL= 2500pF
all transmitters loaded
TA=+25°C, VCC= 3.3V
RL=3 kΩ to 7 kΩ, CL=
50pF
to
1000pF,
measured from -3V to
+3V or +3V to -3V,
3
kbps
0.15
µs
0.1
µs
6
30
V/µs
ESD & Latch up Performance
ESD
Voltage
Protection
Latch
Performance
Human Body Model
IEC1000-4-2, Contact
Discharge
IEC1000-4-2, Air-Gap
Discharge
up
MAX3222/3232 Datasheet Rev. 0.1 , Sept 2005
±15
kV
±8
kV
±15
kV
±200
mA
Page 4 of 7
Anasys Semiconductor, Inc.
Typical Operating Characteristics
(VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA
= +25°C, unless otherwise noted.)
UM3222E/3232E
OPERATION SUPPLY CURRENT
VS.LOAD CAPACITANCE
UM3222E/3232E
SLEW RATE VS.LOAD CAPACITANCE
16
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
14
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
12
SUPPLY CURRENT (mA)
SLEW RATE (V/us)
TRANSMITTER OUTPUT VOLATGE (V)
UM3222E/3232E
TRANSMITTER OUTPUT VOLTAGE
VS.LOAD CAPACITANCE
10
8
6
4
2
0
0
1000
2000
3000
4000
5000
0
1000
LOAD CAPACITANCE(pF)
2000
3000
4000
45
40
35
30
25
20
15
10
5
0
0
5000
1000
2000
3000
4000
5000
LOAD CAPACITANCE(pF)
LOAD CAPACITANCE(pF)
Typical Operating Circuits
+3.3V
+3.3V
CBYPASS
2
C1
17
VCC
C1+
V+
3
1
C1
4
5
C1C2+
C2
CBYPASS
6
C2-
C3
UNION
MAX3222E
V-
16
VCC
C1+
4
C2
2
C3
3
C1C2+
7
V+
5
C2-
UNION
MAX3232E
V-
6
C4
C4
12
T1IN
T1OUT
15
11
T1IN
T1OUT
14
11
T2IN
T2OUT
8
10
T2IN
T2OUT
7
13
R1OUT
R1IN
14
12
R1OUT
R1IN
13
10
R2OUT
R2IN
9
9
R2OUT
R2IN
8
SHDN
18
1
EN
GND
16
MAX3222/3232 Datasheet Rev. 0.1 , Sept
GND
15
Page 5 of 7
Anasys Semiconductor, Inc.
Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3222E/MAX3232Es’ internal power supply consists of a regulated dual charge pump that
provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) over
the +3.0V to +5.5V VCC range. The charge pump operates in discontinuous mode; if the output
voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the
charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a storage
capacitor (C3, C4) to generate the V+ and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that convert TTL/CMOS-logic levels to ±5V
EIA/TIA-232 compliant levels. The MAX3222E/MAX3232E transmitters guarantee a 250kbps data
rate with worst-case loads of 3KΩ parallel with 1000pF. Transmitters can be paralleled to drive
multiple receivers. The MAX3222E transmitters are disabled and the outputs are forced into a
high-impedance state when the device is in shutdown mode ( SHDN = GND). The
MAX3222E/MAX3232E permits the outputs to be driven up to ±12V in shutdown.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic output levels. The MAX3222E receivers have
inverting three-state outputs. Drive EN high to place the receiver(s) into a high impedance state.
Receivers can be either active or inactive in shutdown.
MAX3222E
Supply current falls to less than 1µA in shutdown mode ( SHDN = GND). When shutdown, the
device’s charge pumps are shut off, V+ is pulled down to VCC, V- is pulled to ground, and the
transmitter outputs are disabled (high impedance). The time required to recover from shutdown is
typically 100µs. Connect SHDN to VCC if shutdown mode is not used.
±15kV ESD Protection
ESD-protection structures are incorporated to protect against electrostatic discharges encountered
during handling and assembly. The driver outputs and receiver inputs of the MAX3222E/MAX3232E
have extra protection against static electricity. The ESD structures withstand high ESD in all states:
normal operation, shutdown, and powered down. After an ESD event, Circuits keep working without
latch up. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs for
the MAX3222E/MAX3232E are characterized for protection to the following limits:
• ±15kV using the Human Body Model
• ±8kV using the Contact Discharge method specified in IEC 1000-4-2
• ±15kV using the Air-Gap Discharge method specified in IEC 1000-4-2
MAX3222/3232 Datasheet Rev. 0.1 , Sept. 2005
Page 6 of 7
Anasys Semiconductor, Inc.
Application Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for proper operation; polarized or non-polarized
capacitors can be used. The charge pump requires 0.1µF capacitors for 3.3V operation. Increasing the
capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces
power consumption. C2, C3, and C4 can be increased without changing C1’s value. When using the
minimum required capacitor values, make sure the capacitor value does not degrade excessively with
temperature. If in doubt, use capacitors with a larger nominal value. The capacitor’s equivalent series
resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and
V- output voltages.
Power-Supply Decoupling
In most circumstances, a 0.1µF VCC bypass capacitor is adequate. In applications sensitive to
power-supply noise, use a capacitor of the same value as charge pump capacitor C1. Connect bypass
capacitors as close to the IC as possible.
Operation Down to 2.7V
Transmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.
Transmitter Outputs Recovering from Shutdown
When MAX3222E’s two transmitter outputs were recovering from shutdown mode, the two
transmitter outputs are shown going to opposite RS-232 levels (one transmitter input is high; the other
is low) as they become active. Each transmitter is loaded with 3K resistor in parallel with 2500pF. The
transmitter outputs display no ringing or undesirable transients as they come out of shutdown. Note
that the transmitters are enabled only when the magnitude of V- exceeds approximately -3.0V.
Interconnection with 3V and 5V Logic
The MAX3222E/MAX3232E can directly interface with various 3V and 5V logic families, including
ACT and HCT CMOS.
MAX3222/3232 Datasheet Rev. 0.1 , Sept. 2005
Page 7of 7
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