MAX3228EBV-T [MAXIM]
Line Transceiver, 2 Func, 2 Driver, 2 Rcvr, CMOS, PBGA30, UCSP-30;
| 型号： | MAX3228EBV-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Line Transceiver, 2 Func, 2 Driver, 2 Rcvr, CMOS, PBGA30, UCSP-30 |
| 文件： | 总14页 (文件大小：238K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2140; Rev 0; 8/01
+2.5V to +5.5V RS-232 Transceivers
in UCSP
General Description
Features
The MAX3228/MAX3229 are +2.5V to +5.5V powered
EIA/TIA-232 and V.28/V.24 communications interfaces
with low power requirements, and high data-rate capa-
bilities, in a chip-scale package (UCSP™).
o 6 ✕ 5 Chip-Scale Packaging (UCSP)
o 1µA Low-Power AutoShutdown
o 250kbps Guaranteed Data Rate
The MAX3228/MAX3229 achieve a 1µA supply current
with Maxim’s AutoShutdown™ feature. They save
power without changes to existing BIOS or operating
systems by entering low-power shutdown mode when
the RS-232 cable is disconnected, or when the trans-
mitters of the connected peripherals are off.
o Meets EIA/TIA-232 Specifications Down to +3.1V
o RS-232 Compatible to +2.5V Allows Operation
from Single Li+ Cell
o Small 0.1µF Capacitors
o Configurable Logic Levels
The transceivers have a proprietary low-dropout trans-
mitter output stage, delivering RS-232 compliant perfor-
mance from a +3.1V to +5.5V supply, and RS-232
compatible performance with a supply voltage as low
as +2.5V. The dual charge pump requires only four
small 0.1µF capacitors for operation from a +3.0V sup-
ply. Each device is guaranteed to run at data rates of
250kbps while maintaining RS-232 output levels.
Ordering Information
PIN-
PACKAGE
PART
TEMP. RANGE
MAX3228EBV
MAX3229EBV
-40°C to +85°C
-40°C to +85°C
6 ✕ 5 UCSP*
6 ✕ 5 UCSP*
The MAX3228/MAX3229 offer a separate power-supply
input for the logic interface, allowing configurable logic
levels on the receiver outputs and transmitter inputs.
*Requires solder temperature profile described in the Absolute
Maximum Ratings section.
*UCSP reliability is integrally linked to the user’s assembly
methods, circuit board material, and environment. Refer to the
UCSP Reliabilitly Notice in the UCSP Reliability section of this
data sheet for more information.
Operating over a +1.65V to V
range, V provides the
L
CC
MAX3228/MAX3229 compatibility with multiple logic
families.
The MAX3229 contains one receiver and one transmit-
ter. The MAX3228 contains two receivers and two
transmitters. The MAX3228/MAX3229 are available in
tiny chip-scale packaging and are specified across the
extended industrial temperature range of -40°C to
+85°C.
Typical Operating Circuits
2.5V TO 5.5V 1.65V TO 5.5V
0.1µF
C
0.1µF
BYPASS
A1
A5
V
V
C1
CC
B1
A4
L
C1+
V+
C3
0.1µF
C1
0.1µF
Applications
D1
A2
C1-
C2+
MAX3228
V-
Personal Digital Assistants
Cell Phone Data Lump Cables
Set-Top Boxes
C2
0.1µF
C4
0.1µF
A3
V
L
C2-
T1OUT
A6 T1IN
E3
RS-232
OUTPUTS
TTL/CMOS
INPUTS
V
L
B6
T2IN
T2OUT E4
Hand-Held Devices
Cell Phones
V
L
L
R1IN
D6 R1OUT
E6
5kΩ
TTL/CMOS
OUTPUTS
RS-232
INPUTS
V
Typical Operating Circuits continued at end of data sheet.
Pin Configurations appear at end of data sheet.
C6
R2OUT
R2IN E5
5kΩ
V
V
L
L
TO POWER-
MANAGEMENT
UNIT
UCSP is a trademark of Maxim Integrated Products, Inc.
E2
INVALID
20µA
20µA
FORCEON
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
FORCEOFF C5
B5
V
L
GND
E1
________________________________________________________________ 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.
+2.5V to +5.5V RS-232 Transceivers
in UCSP
ABSOLUTE MAXIMUM RATINGS
CC
V
to GND...........................................................-0.3V to +6.0V
INVALID to GND......................................-0.3V to (V
+ 0.3V)
CC
V+ to GND.............................................................-0.3V to +7.0V
V- to GND ..............................................................+0.3V to -7.0V
V+ to |V-| (Note 1) ................................................................+13V
Short-Circuit Duration T OUT to GND........................Continuous
_
Continuous Power Dissipation (T = +70°C)
A
6 ✕ 5 UCSP (derate 10.1mW/°C above T = +70°C)...805mW
A
V to GND..............................................................-0.3V to +6.0V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Bump Temperature (Soldering) (Note ±)
Infrared (15s) ...............................................................+±00°C
Vapor Phase (±0s) .......................................................+±15°C
L
Input Voltages
T IN, FORCEON, FORCEOFF to GND.......-0.3V to (V + 0.3V)
L
_
R IN to GND .....................................................................±±5V
_
Output Voltages
T OUT to GND...............................................................±13.±V
_
R OUT to GND...........................................-0.3V to (V + 0.3V)
L
_
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
Note 2: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry-standard specification, JEDEC 0±0A, paragraph 7.6, Table 3 for IR/VPR and convection reflow. Pre-
heating is required. Hand or wave soldering is not allowed.
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.
ELECTRICAL CHARACTERISTICS
(V
= +±.5V to +5.5V, V = +1.65V to +5.5V, C1–C4 = 0.1µF, tested at +3.3V ±10ꢀ, T = T
to T
. Typical values are at T =
MAX A
CC
L
A
MIN
+±5°C, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
V Input Voltage Range
V
1.65
V
CC
+ 0.3
10
V
L
L
FORCEON = GND
µA
FORCEOFF = V , all R open
L
IN
V
Supply Current,
CC
I
CC
CC
AutoShutdown
FORCEOFF = GND
10
1
µA
FORCEON, FORCEOFF floating
mA
V
Supply Current,
FORCEON = FORCEOFF = V
no load
CC
L
I
0.3
1
mA
AutoShutdown Disabled
FORCEON or FORCEOFF = GND, V
V = +5v
L
=
CC
85
1
V Supply Current
L
I
µA
L
FORCEON, FORCEOFF floating
LOGIC INPUTS
Pullup Currents
FORCEON, FORCEOFF to V
±0
µA
V
L
Input Logic Low
T_IN, FORCEON, FORCEOFF
T_IN, FORCEON, FORCEOFF
0.4
±1
✕
Input Logic High
0.66
V
V
L
Transmitter Input Hysteresis
Input Leakage Current
RECEIVER OUTPUTS
0.5
V
T_IN
±0.01
µA
R_OUT, receivers disabled, FORCEOFF =
GND or in AutoShutdown
Output Leakage Currents
Output Voltage Low
±10
0.4
µA
V
I
= 0.8mA
OUT
Output Voltage High
I
= -0.5mA
V - 0.4 V - 0.1
V
OUT
L
L
2
_______________________________________________________________________________________
+2.5V to +5.5V RS-232 Transceivers
in UCSP
ELECTRICAL CHARACTERISTICS (continued)
(V
= +±.5V to +5.5V, V = +1.65V to +5.5V, C1–C4 = 0.1µF, tested at +3.3V ±10ꢀ, T = T
to T
. Typical values are at T =
MAX A
CC
L
A
MIN
+±5°C, unless otherwise noted.) (Note 3)
PARAMETER
RECEIVER INPUTS
Input Voltage Range
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
-±5
0.6
0.8
+±5
V
V
V
V
V
V
= 3.3V
= 5.0V
= 3.3V
= 5.0V
1.±
1.7
1.3
1.8
0.5
5
CC
CC
CC
CC
Input Threshold Low
Input Threshold High
T
T
= +±5°C
= +±5°C
A
A
±.4
±.4
V
Input Hysteresis
Input Resistance
AUTOSHUTDOWN
V
3
7
kΩ
Positive threshold
Negative threshold
±.7
Receiver Input Threshold to
INVALID Output High
Figure 3a
V
-±.7
-0.3
Receiver Input Threshold to
INVALID Output Low
0.3
V
Receiver Positive or Negative
Threshold to INVALID High
t
V
V
V
= +5.0V, Figure 3b
= +5.0V, Figure 3b
= +5.0V, Figure 3b
1
µs
µs
µs
INVH
CC
CC
CC
Receiver Positive or Negative
Threshold to INVALID Low
t
30
INVL
Receiver Edge to Transmitters
Enabled
t
100
WU
TRANSMITTER OUTPUTS
V
(V
Mode Switch Point
Falling)
CC
T_OUT = ±5.0V to ±3.7V
T_OUT = ±3.7V to ±5.0V
±.85
3.3
3.1
3.7
V
CC
V
(V
Mode Switch Point
Rising)
CC
V
CC
V
CC
Mode Switch Point Hysteresis
400
mV
V
= +3.1V to
CC
±5
±5.4
All transmitter
outputs loaded with
3kΩ to ground.
+5.5V, V
falling
CC
Output Voltage Swing
V
V
= +±.5V to
CC
±3.7
300
+±.9V
Output Resistance
V
= V+ = V- = 0, T_OUT = ±±V
10M
Ω
CC
Output Short-Circuit Current
Output Leakage Current
INVALID OUTPUT
±60
±±5
mA
µA
T_OUT = ±1±V, transmitters disabled
Output Voltage Low
Output Voltage High
I
I
= 0.8mA
= -0.5mA
0.4
V
V
OUT
OUT
V
CC
- 0.4 V
- 0.1
CC
_______________________________________________________________________________________
3
+2.5V to +5.5V RS-232 Transceivers
in UCSP
TIMING CHARACTERISTICS
(V
= +±.5V to +5.5V, V = +1.65V to +5.5V, C1–C4 = 0.1µF, tested at +3.3V ±10ꢀ, T = T
to T
. Typical values are at T =
MAX A
CC
L
A
MIN
+±5°C, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R = 3kΩ, C = 1000pF, one transmitter
switching
L
L
Maximum Data Rate
±50
kbps
µs
Receiver input to receiver output,
C = 150pF
Receiver Propagation Delay
0.15
L
Receiver Output Enable-Time
Receiver Output Disable-Time
Transmitter Skew
V
V
= V = +5V
±00
±00
100
50
ns
ns
ns
ns
CC
CC
L
= V = +5V
L
| t
| t
- t
|
|
PHL PLH
Receiver Skew
- t
PHL PLH
R = 3kΩ to 7kΩ, C = 150pF to
L
L
Transition Region Slew Rate
6
30
V/µs
1000pF, T = +±5°C
A
Note 3: V
must be greater than V .
L
CC
Typical Operating Characteristics
(V
= +3.3V, ±50kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C , T = +±5°C, unless otherwise noted.)
CC
L
A
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE (MAX3229)
SLEW RATE vs. LOAD CAPACITANCE
20
18
16
14
12
10
8
6
30
25
20
15
10
5
V
CC
RISING
4
2
V
OH
250kbps
V
CC
= 5.5V
0
V
OL
-2
-4
-6
6
4
V
CC
= 2.5V
2
20kbps
0
0
0
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
0
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
0
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
+2.5V to +5.5V RS-232 Transceivers
in UCSP
Typical Operating Characteristics (continued)
(V
= +3.3V, ±50kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C , T = +±5°C, unless otherwise noted.)
L A
CC
OPERATING SUPPLY CURRENT
vs. SUPPLY VOLTAGE (MAX3229)
TRANSMITTER OUTPUT VOLTAGE vs.
SUPPLY VOLTAGE (V RISING)
TRANSMITTER OUTPUT VOLTAGE vs.
SUPPLY VOLTAGE (V FALLING)
CC
CC
20
18
16
14
12
10
8
10
8
10
8
6
6
4
4
V
OH
V
OH
2
2
0
0
-2
-4
-6
-8
-2
-4
-6
-8
V
V
OL
OL
6
4
2
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Pin Description
PIN
NAME
FUNCTION
MAX3228
MAX3229
A1
A±
A3
A4
A1
A±
A3
A4
V
+±.5V to +5.5V Supply Voltage
CC
C±+
C±-
V-
Positive Terminal of Inverting Charge-Pump Capacitor
Negative Terminal of Inverting Charge-Pump Capacitor
-5.5V/-4.0V Generated by Charge Pump
Logic-Level Input for Receiver Outputs and Transmitter Inputs. Connect V to the
L
A5
A6, B6
B1
A5
A6
B1
V
L
system logic supply voltage or V
if no logic supply is required.
CC
T_IN
V+
Transmitter Input(s)
+5.5V/+4.0V Generated by Charge Pump. If charge pump is generating +4.0V, the part
has switched from RS-±3± compliant to RS-±3± compatible mode.
B±, B3, B4, B±, B3, B4,
C±, C3, C4, C±, C3, C4,
D±, D3, D4, D±, D3, D4,
N.C.
No Connection. These locations are not populated with solder bumps.
D5
D5
FORCEON Input, Active-High. Drive FORCEON high to override automatic circuitry,
keeping transmitters and charge pumps on. Pulls itself high internally if not connected.
B5
B5
FORCEON
B6, D6,
E4, E6
No Connection. These locations are populated with solder bumps, but are electrically
isolated.
—
N.C.
C1+
C1
C1
Positive Terminal of Positive Regulated Charge-Pump Capacitor
_______________________________________________________________________________________
5
+2.5V to +5.5V RS-232 Transceivers
in UCSP
Pin Description (continued)
PIN
NAME
FUNCTION
MAX3228
MAX3229
FORCEOFF Input, Active-Low. Drive FORCEOFF low to shut down transmitters,
receivers, and on-board charge pump. This overrides all automatic circuitry and
FORCEON. Pulls itself high internally if not connected.
C5
C5
FORCEOFF
C6, D6
D1
C6
D1
E1
R_OUT
C1-
Receiver Output(s)
Negative Terminal of Positive Regulated Charge-Pump Capacitor.
Ground
E1
GND
Output of Valid Signal Detector. INVALID is enabled low if no valid RS-±3± level is
present on any receiver input.
E±
E±
INVALID
E3, E4
E5, E6
E3
E5
T_OUT
R_IN
RS-±3± Transmitter Output(s)
RS-±3± Receiver Input(s)
Table 1. Operating Supply Options
SYSTEM SUPPLY (V)
1 Li+ Cell
V
(V)
V (V)
L
RS-232 MODE
CC
+±.4 to +4.±
+±.4 to +3.8
Regulated System Voltage
Regulated System Voltage
Compliant/Compatible
Compliant/Compatible
3 NiCad/NiMH Cells
Regulated Voltage Only
+3.0 to +5.5
+±.5 to +3.0
+3.0 to +5.5
+±.5 to +3.0
Compliant
(V
CC
falling)
Regulated Voltage Only
(V falling)
Compatible
CC
Voltage Generation in the
Switchover Region
Detailed Description
Dual-Mode Regulated Charge-Pump
Voltage Converter
The MAX3±±8/MAX3±±9 include a switchover circuit
between these two modes that have approximately
400mV of hysteresis around the switchover point. The
hysteresis is shown in Figure 1. This large hysteresis
eliminates mode changes due to power-supply
bounce.
The MAX3±±8/MAX3±±9 internal power supply consists
of a dual-mode regulated charge pump. For supply
voltages above +3.7V, the charge pump will generate
+5.5V at V+ and -5.5V at V-. The charge pumps oper-
ate in a discontinuous mode. If the output voltages are
less than ±5.5V, the charge pumps are enabled, if the
output voltages exceed ±5.5V, the charge pumps are
disabled.
V
CC
For supply voltages below +±.85V, the charge pump
will generate +4.0V at V+ and -4.0V at V-. The charge
pumps operate in a discontinuous mode. If the output
voltages are less than ±4.0V, the charge pumps are
enabled, if the output voltages exceed ±4.0V, the
charge pumps are disabled.
4V
0
V+
6V
Each charge pump requires a flying capacitor (C1, C±)
and a reservoir capacitor (C3, C4) to generate the V+
and V- supply voltages.
0
20ms/div
Figure 1. V+ Switchover for Changing V
CC
6
_______________________________________________________________________________________
+2.5V to +5.5V RS-232 Transceivers
in UCSP
+2.7V
+0.3V
TO MAX322 _
TO MAX322 _
POWER SUPPLY
R_IN
POWER SUPPLY
R_IN
-0.3V
30µs
COUNTER
R
AND TRANSMITTERS
30µs
COUNTER
R
INVALID
INVALID
-2.7V
*TRANSMITTERS ARE ENABLED IF:
*TRANSMITTERS ARE DISABLED, REDUCING SUPPLY CURRENT TO 1µA IF
ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30µs.
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.
Figure 2a. MAX322_ Entering 1µA Supply Mode via
AutoShutdown
Figure 2b. MAX322_ with Transmitters Enabled Using
AutoShutdown
For example, a three-cell NiMh battery system starts at
CC
the power is off, the MAX3±±8/MAX3±±9 permit the
transmitter outputs to be driven up to ±1±V.
V
= +3.6V, and the charge pump will generate an
output voltage of ±5.5V. As the battery discharges, the
MAX3±±8/MAX3±±9 maintain the outputs in regulation
until the battery voltage drops below +3.1V. Then the
output regulation points change to ±4.0V
The transmitter inputs do not have pullup resistors.
Connect unused inputs to GND or V .
L
RS-232 Receivers
The MAX3±±8/MAX3±±9 receivers convert RS-±3± sig-
nals to logic output levels. All receivers have inverting
three-state outputs and can be active or inactive. In
shutdown (FORCEOFF = low) or in AutoShutdown, the
MAX3±±8/MAX3±±9 receivers are in a high-impedance
state (Table 3).
When V
is rising, the charge pump will generate an
CC
output voltage of ±4.0V, while V
is between +±.5V
CC
and +3.5V. When V
rises above the switchover volt-
CC
age of +3.5V, the charge pump switches modes to
generate an output of ±5.5V.
Table 1 shows different supply schemes and their
operating voltage ranges.
The MAX3±±8/MAX3±±9 feature an INVALID output that
is enabled low when no valid RS-±3± signal levels have
been detected on any receiver inputs. INVALID is func-
tional in any mode (Figures ± and 3).
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to RS-±3± levels. The
MAX3±±8/MAX3±±9 will automatically reduce the RS-
±3± compliant levels (±5.5V) to RS-±3± compatible lev-
els (±4.0V) when V
falls below approximately +3.1V.
CC
V
L
The reduced levels also reduce supply current require-
ments, extending battery life. Built-in hysteresis of
approximately 400mV for V
ensures that the RS-±3±
CC
FORCEOFF
output levels do not change if V
is noisy or has a
CC
POWER DOWN
V
L
sudden current draw causing the supply voltage to
drop slightly. The outputs will return to RS-±3± compli-
V
CC
ant levels (±5.5V) when V
+3.5V.
rises above approximately
CC
FORCEON
INVALID
The MAX3±±8/MAX3±±9 transmitters guarantee a
±50kbps data rate with worst-case loads of 3kΩ in par-
allel with 1000pF.
INVALID IS AN INTERNALLY GENERATED SIGNAL
THAT IS USED BY THE AUTOSHUTDOWN LOGIC
AND APPEARS AS AN OUTPUT OF THE DEVICE.
When FORCEOFF is driven to ground, the transmitters
and receivers are disabled and the outputs become
high impedance. When the AutoShutdown circuitry
senses that all receiver and transmitter inputs are inac-
tive for more than 30µs, the transmitters are disabled
and the outputs go to a high-impedance state. When
POWER DOWN IS ONLY AN INTERNAL SIGNAL.
IT CONTROLS THE OPERATIONAL STATUS OF
THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 2c. MAX322_ AutoShutdown Logic
_______________________________________________________________________________________
7
+2.5V to +5.5V RS-232 Transceivers
in UCSP
AutoShutdown
The MAX3±±8/MAX3±±9 achieve a 1µA supply current
with Maxim’s AutoShutdown feature, which operates
when FORCEON is low and FORCEOFF is high. When
these devices sense no valid signal levels on all receiv-
er inputs for 30µs, the on-board charge pump and dri-
TRANSMITTERS ENABLED, INVALID HIGH
+2.7V
INDETERMINATE
+0.3V
0
AUTOSHUTDOWN, TRANSMITTERS DISABLED,
vers are shut off, reducing V
supply current to 1µA.
CC
1µA SUPPLY CURRENT, INVALID LOW
This occurs if the RS-±3± cable is disconnected or the
connected peripheral transmitters are turned off. The
device turns on again when a valid level is applied to
any RS-±3± receiver input. As a result, the system
saves power without changes to the existing BIOS or
operating system.
-0.3V
INDETERMINATE
-2.7V
TRANSMITTERS ENABLED, INVALID HIGH
Table 3 and Figure ±c summarize the MAX3±±8/
MAX3±±9 operating modes. FORCEON and FORCEOFF
override AutoShutdown. When neither control is assert-
ed, the IC selects between these states automatically,
based on receiver input levels. Figures ±a, ±b, and 3a
depict valid and invalid RS-±3± receiver levels. Figures
3a and 3b show the input levels and timing diagram for
AutoShutdown operation.
a)
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
REGION
A system with AutoShutdown may need time to wake
up. Figure 4 shows a circuit that forces the transmitters
on for 100ms, allowing enough time for the other sys-
tem to realize that the MAX3±±8/MAX3±±9 are active. If
the other system transmits valid RS-±3± signals within
that time, the RS-±3± ports on both systems remain
enabled.
V
CC
INVALID
OUTPUT
(V)
0
t
t
INVH
INVL
t
WU
V+
V
CC
0
When shut down, the devices’ charge pumps are off,
V+ is pulled to V , V- is pulled to ground, and the
CC
V-
transmitter outputs are high-impedance. The time
required to exit shutdown is typically 100µs (Figure 3b).
b)
FORCEON and FORCEOFF
In case FORCEON and FORCEOFF are inaccessible,
these pins have 60Ω (typ) pullup resistors connected to
Figure 3. AutoShutdown Trip Levels
V (Table ±). Therefore, if FORCEON and FORCEOFF
L
are not connected, the MAX3±±8 and MAX3±±9 will
always be active. Pulling these pins to ground will draw
POWER-
MANAGEMENT
UNIT
MASTER SHDN LINE
current from the V supply. This current can be calcu-
L
0.1µF
1MΩ
lated from the voltage supplied at V and the 60kΩ
L
(typ) pullup resistor.
FORCEOFF FORCEON
V Logic Supply Input
L
Unlike other RS-±3± interface devices, where the
MAX3228
MAX3229
receiver outputs swing between 0 and V , the
CC
Table 2. Power-On Default States
Figure 4. AutoShutdown with Initial Turn-On to Wake Up a System
PIN NAME
FORCEON
FORCEOFF
POWER-ON DEFAULT
MECHANISM
Internal pullup
Internal pullup
High
High
8
_______________________________________________________________________________________
+2.5V to +5.5V RS-232 Transceivers
in UCSP
Table 3. Output Control Truth Table
TRANSCEIVER STATUS
Shutdown (AutoShutdown)
Shutdown (Forced Off)
FORCEON
Low
FORCEOFF
High
RECEIVER STATUS
High-Z
INVALID
L
†
X
Low
High-Z
Normal Operation (Forced On)
Normal Operation (AutoShutdown)
High
Low
High
Active
†
High
Active
H
X = Don’t care.
† = INVALID output state is determined by R_IN input levels.
MAX3±±8/MAX3±±9 feature a separate logic supply
transmitter outputs and slightly reduces power con-
sumption. C±, C3, and C4 can be increased without
changing C1’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 capac-
itors).
input (V ) that sets V
for the receiver and INVALID
OH
L
outputs. The transmitter inputs (T_IN), FORCEON and
FORCEOFF, are also referred to V . This feature allows
L
maximum flexibility in interfacing to different systems
and logic levels. Connect V to the system’s logic sup-
L
ply voltage (+1.65V to +5.5V), and bypass it with a
0.1µF capacitor to GND. If the logic supply is the same
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiv-
alent series resistance (ESR) usually rises at low
temperatures and influences the amount of ripple on
V+ and V-.
as V , connect V to V . Always enable V before
CC
CC
L
CC
CC
enabling the V supply. V
equal to the V supply.
must be greater than or
L
L
Software-Controlled Shutdown
If direct software control is desired, connect FORCEOFF
and FORCEON together to disable AutoShutdown. The
microcontroller then drives FORCEOFF and FORCEON
like a SHDN input, INVALID can be used to alert the
microcontroller to indicate serial data activity.
Power-Supply Decoupling
In most circumstances, a 0.1µF V
bypass capacitor
CC
is adequate. In applications that are sensitive to power-
supply noise, use a capacitor of the same value as the
charge-pump capacitor C1. Connect bypass capaci-
tors as close to the IC as possible.
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; either polarized or nonpolarized
capacitors may be used. However, ceramic chip
capacitors with an X7R or X5R dielectric work best. The
charge pump requires 0.1µF capacitors for 3.3V opera-
tion. For other supply voltages, refer to Table 4 for
required capacitor values. Do not use values smaller
than those listed in Table 4. Increasing the capacitor
values (e.g., by a factor of ±) reduces ripple on the
5V/div
FORCEON =
FORCEOFF
0
2V/div
Table 4. Required Capacitor Values
T
OUT
0
V
(V)
C1, C
(µF)
C2, C3, C4 (µF)
CC
BYPASS
0.±±
±.5 to 3.0
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
0.±±
0.1
0.33
1
4µs/div
0.1
Figure 5. Transmitter Outputs Exiting Shutdown or Powering Up
0.047
0.±±
_______________________________________________________________________________________
9
+2.5V to +5.5V RS-232 Transceivers
in UCSP
V
CC
V
L
5V
T_IN
0.1µF
C1
0.1µF
0
5V
V
CC
V
L
C1+
V+
V-
T_OUT
C3
0
C1-
C2+
-5V
5V
0
MAX3229
C2
C4
R_OUT
C2-
V
L
L
T1IN
T1OUT
4µs/div
1000pF
V
Figure 7. Loopback Test Result at 120kbps
R1IN
R1OUT
5kΩ
5V
TO POWER-
MANAGEMENT UNIT
T_IN
INVALID
0
FORCEON
FORCEOFF
V
L
5V
GND
T_OUT
0
-5V
5V
0
Figure 6. Transmitter Loopback Test Circuit
R_OUT
Transmitter Outputs when
Exiting Shutdown
4µs/div
Figure 5 shows a transmitter output when exiting shut-
down mode. The transmitter is loaded with 3kΩ in par-
allel with 1000pF. The transmitter output displays no
ringing or undesirable transients as it comes out of
shutdown, and is enabled only when the magnitude of
V- exceeds approximately -3V.
Figure 8. Loopback Test Result at 250kbps
cuit. Figure 7 shows a loopback test result at 1±0kbps,
and Figure 8 shows the same test at ±50kbps. For
Figure 7, the transmitter was driven at 1±0kbps into an
RS-±3± load in parallel with 1000pF. For Figure 8, a sin-
gle transmitter was driven at ±50kbps, and loaded with
an RS-±3± receiver in parallel with 1000pF.
High Data Rates
The MAX3±±8/MAX3±±9 maintain the RS-±3± ±5.0V
minimum transmitter output voltage even at high data
rates. Figure 6 shows a transmitter loopback test cir-
10 ______________________________________________________________________________________
+2.5V to +5.5V RS-232 Transceivers
in UCSP
Table 5. Reliability Test Data
NO. OF FAILURES PER
SAMPLE SIZE
TEST
CONDITIONS
DURATION
-35°C to +85°C,
-40°C to +100°C
150 cycles,
900 cycles
0/10,
0/±00
Temperature Cycle
Operating Life
T
= +70°C
±40hr
±40hr
±40hr
0/10
0/10
0/10
A
Moisture Resistance
Low-Temperature Storage
+±0°C to +60°C, 90ꢀ RH
-±0°C
Low-Temperature Operational
-10°C
±4hr
0/10
Solderability
ESD
8hr steam age
—
—
0/15
0/5
±000V, Human Body Model
High-Temperature Operating
Life
T = +150°C
J
168hr
0/45
UCSP Reliability
Typical Operating Circuits
(continued)
The UCSP represents a unique packaging form factor
that may not perform equally to a packaged product
through traditional mechanical reliability tests. CSP relia-
bility is integrally linked to the user’s assembly methods,
circuit board material, and usage environment. The user
should closely review these areas when considering use
of a CSP package. Performance through Operating Life
Test and Moisture Resistance remains uncompromised
as it is primarily determined by the wafer-fabrication
process.
2.5V TO 5.5V 1.65V TO 5.5V
C
0.1µF
0.1µF
BYPASS
A1
A5
V
V
C1
CC
B1
A4
L
C1+
V+
C3
0.1µF
C1
0.1µF
D1
A2
C1-
C2+
MAX3229
V-
C4
C2
0.1µF
Mechanical stress performance is a greater considera-
tion for a CSP package. CSPs are attached through
direct solder contact to the user’s PC board, foregoing
the inherent stress relief of a packaged product lead
frame. Solder joint contact integrity must be consid-
ered. Table 5 shows the testing done to characterize
the CSP reliability performance. In conclusion, the
UCSP is capable of performing reliably through envi-
ronmental stresses as indicated by the results in the
table. Additional usage data and recommendations are
detailed in the UCSP application note, which can be
found on Maxim’s website at www.maxim-ic.com.
0.1µF
A3
A6
V
L
C2-
T1OUT
T1IN
E3
E5
V
L
RS-232
TTL/CMOS
R1IN
C6 R1OUT
5kΩ
V
L
V
L
TO POWER-
MANAGEMENT
UNIT
E2
INVALID
20µA
FORCEON
20µA
FORCEOFF C5
B5
V
L
Chip Information
TRANSISTOR COUNT: 698
GND
E1
PROCESS TECHNOLOGY: CMOS
______________________________________________________________________________________ 11
+2.5V to +5.5V RS-232 Transceivers
in UCSP
Pin Configurations
TOP VIEW
C2+
N.C.
N.C.
N.C.
C2-
N.C.
N.C.
N.C.
A
V
V-
V
T1IN
CC
L
V+
B
N.C.
N.C.
FON
T2IN
C
FOFF
R2OUT
C1+
C1-
N.C.
D
E
N.C.
R1OUT
INV
2
R2IN
5
R1IN
6
GND
1
T1OUT
3
T2OUT
4
MAX3228
FON = FORCEON
FOFF = FORCEOFF
INV = INVALID
12 ______________________________________________________________________________________
+2.5V to +5.5V RS-232 Transceivers
in UCSP
Pin Configurations (continued)
TOP VIEW
C2+
N.C.
N.C.
N.C.
C2-
N.C.
N.C.
N.C.
A
V
V-
V
T1IN
CC
L
V+
B
N.C.
N.C.
FON
N.C.
C
FOFF
R1OUT
C1+
C1-
N.C.
D
E
N.C.
N.C.
INV
2
R1IN
5
N.C.
6
GND
1
T1OUT
3
N.C.
4
MAX3229
FON = FORCEON
FOFF = FORCEOFF
INV = INVALID
______________________________________________________________________________________ 13
+2.5V to +5.5V RS-232 Transceivers
in UCSP
Package Information
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© ±001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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