MAX3389ECUG [MAXIM]
2.5V, 【15kV ESD-Protected RS-232 Transceivers for PDAs and Cell Phones; 2.5V , ± 15kV ESD保护, RS - 232收发器,用于PDA和手机型号: | MAX3389ECUG |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | 2.5V, 【15kV ESD-Protected RS-232 Transceivers for PDAs and Cell Phones |
文件: | 总11页 (文件大小:276K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
19-1845; Rev 1; 9/01
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
General Description
Features
The MAX3388E/MAX3389E are 2.5V-powered EIA/TIA-
232 and V.28/V.24 communications interfaces with low
power requirements, high data-rate capabilities, and
enhanced electrostatic discharge (ESD) protection. The
MAX3388E/MAX3389E have two receivers and three
transmitters. All RS-232 inputs and outputs are protected
to ±±5ꢀV using the IEꢁ ±111-4-2 Air-ꢂap Discharge
method, ±8ꢀV using the IEꢁ ±111-4-2 ꢁontact Discharge
method, and ±±5ꢀV using the ꢃuman ꢄodꢅ Model.
ꢀ V Pin for Compatibility with Mixed-Voltage
L
Systems
ꢀ Additional I/O for Hot-Sync Applications
ꢀ ±±15V ꢀSꢁ Protection on ꢂx Inpꢃtsꢄ ꢅx Oꢃtpꢃtsꢄ
LINꢄ and SWIN
ꢀ Low 300µA Sꢃpply Cꢃrrent
ꢀ Gꢃaranteed 4605bps ꢁata ꢂate
ꢀ ±µA Low-Power Shꢃtdown
In addition to the traditional RS-232 I/O, these devices have
dedicated logic-level I/O pins for additional device-to-
device handshaꢀing. During shutdown the logic-level I/O
pins are active for the MAX3389E. An internal 62Ω switch is
provided to switch power to external circuitrꢅ or modules.
ꢀ Integrated Switch for Powering ꢂemote Circꢃitry
ꢀ Flow-ꢅhroꢃgh Pinoꢃt
ꢀ L
Active ꢁꢃring Shꢃtdown (MAX3389ꢀ)
OUꢅ
A proprietarꢅ low-dropout transmitter output stage
enables RS-232 compatible performance from a +2.35V
to +3.1V supplꢅ with a dual charge pump. The charge
pump requires onlꢅ four small 1.±µF capacitors for oper-
ation from a +2.5V supplꢅ. The MAX3388E/MAX3389E
are capable of running at data rates up to 461ꢀbps while
maintaining RS-232-compatible output levels.
Applications
Subnotebooꢀ/Palmtop ꢁomputers
PDAs and PDA ꢁradles
ꢁell Phone Data ꢁables
ꢄatterꢅ-Powered Equipment
ꢃand-ꢃeld Equipment
Peripherals
The MAX3388E/MAX3389E have a unique V pin that
L
allows interoperation in mixed-logic voltage sꢅstems.
ꢄoth input and output logic levels are pin programma-
ble through the V pin. The MAX3388E/MAX3389E are
L
Ordering Information
available in a space-saving TSSOP pacꢀage.
PAꢂꢅ
ꢅꢀMP. ꢂANGꢀ
1°ꢁ to +71°ꢁ
-41°ꢁ to +85°ꢁ
1°ꢁ to +71°ꢁ
-41°ꢁ to +85°ꢁ
PIN-PACKAGꢀ
24 TSSOP
Typical Operating Circuit
MAX3388ꢀꢁUꢂ
MAX3388EEUꢂ
MAX3389ꢀꢁUꢂ
MAX3389EEUꢂ
24 TSSOP
+2.5V
24
23
14
24 TSSOP
C
BYPASS
SHDN
V
V
L
CC
2
6
1
3
4
5
C1+
24 TSSOP
V+
V-
C1
0.1µF
C3
0.1µF
C1-
C2+
MAX3388E
MAX3389E
-in Configuration
C2
0.1µF
C4
0.1µF
C2-
7
T1OUT
T1IN
TOP VIEW
21
20
19
C1+
V+
1
2
3
4
5
6
7
8
9
24 SHDN
T2IN
T3IN
T2OUT
T3OUT
8
9
23
V
CC
RS-232
I/O
C1-
C2+
C2-
V-
22 GND
21 T1OUT
20 T2OUT
19 T3OUT
18 R1IN
17 R2IN
16 LIN
V
V
L
L
13 R1OUT
R1IN
5kΩ
R2IN
18
17
MAX3388E
MAX3389E
12 R2OUT
10 LOUT
T1IN
T2IN
T3IN
5kΩ
LIN
16
15
30kΩ
SHDN
LOUT 10
15 SWIN
11
SWOUT 11
R2OUT 12
14
V
L
SWIN
SWOUT
GND
22
=
15kV ESD PROTECTION
13 R1OUT
ꢁovered bꢅ U.S Patent numbers 4,636,931; 4,679,±34;
4,777,577; 4,797,899; 4,819,±52; 4,897,774; 4,999,76±.
ꢅSSOP
________________________________________________________________ Maxim Integrated Products
±
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, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
ABSOLUꢅꢀ MAXIMUM ꢂAꢅINGS
ꢁꢁ
V
to ꢂND..............................................................-1.3V to +6V
Short-ꢁircuit Duration T_OUT to ꢂND........................ꢁontinuous
V to ꢂND...................................................-1.3V to (V
+ 1.3V)
ꢁontinuous Power Dissipation (T = +71°ꢁ)
24-Pin TSSOP (derate ±2.2mW/°ꢁ above +71°ꢁ) ........975mW
Operating Temperature Ranges
MAX338_EꢁUꢂ ...................................................1°ꢁ to +71°ꢁ
MAX338_EEUꢂ.................................................-41°ꢁ to +85°ꢁ
Junction Temperature......................................................+±51°ꢁ
Storage Temperature Range.............................-65°ꢁ to +±51°ꢁ
Lead Temperature (soldering, ±1s) .................................+311°ꢁ
L
ꢁꢁ
A
V+ to ꢂND................................................................-1.3V to +7V
V- to ꢂND .................................................................+1.3V to -7V
V+ +V-(Note ±) ............................................................... +±3V
Input Voltages
T_IN, SHDN, LIN to ꢂND.......................................-1.3V to +6V
R_IN to ꢂND .....................................................................±25V
SWIN to ꢂND...........................................-1.3V to (V + 1.3V)
ꢁꢁ
Output Voltages
T_OUT to ꢂND...............................................................±±3.2V
R_OUT, SWOUT, LOUT to ꢂND ................-1.3V to (V + 1.3V)
L
Note ±: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed ±3V.
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.
ꢁC ꢀLꢀCꢅꢂICAL CHAꢂACꢅꢀꢂISꢅICS
(V
= V = +2.35V to +3.1V, ꢁ±–ꢁ4 = 1.±µF, T = T
to T
, unless otherwise noted. Tꢅpical values are at V = V = +2.5V,
ꢁꢁ L
ꢁꢁ
L
A
MIN
MAX
T
A
= +25°ꢁ.)
PAꢂAMꢀꢅꢀꢂ
SYMBOL
= +2.5V, T = +25°ꢁ)
CONꢁIꢅIONS
MIN
ꢅYP
MAX
UNIꢅS
ꢁC CHAꢂACꢅꢀꢂISꢅICS (V
Shutdown Supplꢅ ꢁurrent
Supplꢅ ꢁurrent
ꢁꢁ
A
±
±1
±
µA
SHDN = ꢂND, all inputs at ꢂND
SHDN = V , no load
1.3
mA
ꢁꢁ
LOGIC INPUꢅS (T_IN, SHDN)
Input Logic Low
V = +2.5V
1.6
±±
V
V
L
Input Logic ꢃigh
V = +2.5V
L
±.5
Transmitter Input ꢃꢅsteresis
Input Leaꢀage ꢁurrent
ꢂꢀCꢀIVꢀꢂ OUꢅPUꢅS
Output Leaꢀage ꢁurrent
Output Voltage Low
1.4
V
±1.1±
µA
±1.15
±±1
1.4
µA
V
R_OUT, SHDN = 1
I
= ±.6mA
OUT
V -
L
1.6
V -
L
1.±3
Output Voltage ꢃigh
I
= -±mA
V
OUT
ꢂꢀCꢀIVꢀꢂ INPUꢅS
Input Voltage Range
Input Threshold Low
Input Threshold ꢃigh
Input ꢃꢅsteresis
-25
1.6
+25
2.4
7
V
V
T
T
= +25°ꢁ, V = +2.5V
±.±
±.8
1.7
5
A
L
= +25°ꢁ, V = +2.5V
L
V
A
V
Input Resistance
T
A
= +25°ꢁ
3
ꢀΩ
ꢅꢂANSMIꢅꢅꢀꢂ OUꢅPUꢅS
All transmitter outputs loaded with 3ꢀΩ to
Output Voltage Swing
±3.7
311
±4.2
±1M
V
ground
Output Resistance
V
V
= 1, transmitter output = ±2V
Ω
ꢁꢁ
Output Short-ꢁircuit ꢁurrent
= 1
±61
mA
T_OUT
2
_______________________________________________________________________________________
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
ꢁC ꢀLꢀCꢅꢂICAL CHAꢂACꢅꢀꢂISꢅICS (continꢃed)
(V
= V = +2.35V to +3.1V, ꢁ±–ꢁ4 = 1.±µF, T = T
to T
, unless otherwise noted. Tꢅpical values are at V = V = +2.5V,
ꢁꢁ L
ꢁꢁ
L
A
MIN
MAX
T
A
= +25°ꢁ.)
PAꢂAMꢀꢅꢀꢂ
SYMBOL
CONꢁIꢅIONS
= ±±1Vꢀ tranꢁsmtterꢁ ꢂmꢁaꢃbeꢂꢀ
MIN
ꢅYP
MAX
±15
UNIꢅS
V
V
T_OUT
Output Leakage Current
µA
= 0 or +1.5V
CC
HANꢁSHAKING I/O (LINꢄ LOUꢅ)
Input Vobtage Range
Input Threꢁhobꢂ Low
Input Threꢁhobꢂ Hmgh
Input Hyꢁtereꢁmꢁ
0
V
V
V
CC
1
LINꢀ V = +1.5Vꢀ T = +15°C
0.6
±.±
±.7
0.6
L
A
LINꢀ V = +1.5Vꢀ T = +15°C
V
L
A
V
Input Reꢁmꢁtance
T
= +15oC
10
0
40
0.4
±0
kΩ
V
A
Output Vobtage Low
Output Leakage Current
SWIꢅCH (SWINꢄ SWOUꢅ)
Input Vobtage Range
On-Reꢁmꢁtance
LOUTꢀ I
= ±.6sA
SINK
LOUT = V ꢀ LIN = bow or fboat
L
µA
V
V
Ω
CC
±00
±
61
Off-Leakage Current
Turn-On Tmse
SHDN = 0
µA
µꢁ
µꢁ
0.±8
0.7
Turn-Off Tmse
ꢀSꢁ PꢂOꢅꢀCꢅION
Husan Boꢂy Moꢂeb
±±5
±±5
±8
R_INꢀ T_OUTꢀ LINꢀ SWIN
ESD Protectmon
kV
IEC ±000-4-1 Amr-Gap Dmꢁcharge sethoꢂ
IEC ±000-4-1 Contact Dmꢁcharge sethoꢂ
ꢅIMING CHAꢂACꢅꢀꢂISꢅICS
(V
ꢁꢁ
= V = +2.35V to +3.1V, ꢁ±–ꢁ4 = 1.±µF, T = T
to T , unless otherwise noted. Tꢅpical values are at V = V = +2.5V,
MAX ꢁꢁ L
L
A
MIN
T = +25°ꢁ.)
A
PAꢂAMꢀꢅꢀꢂ
SYMBOL
CONꢁIꢅIONS
R = 3ꢀΩ, ꢁ = ±111pF,
MIN
ꢅYP
MAX
UNIꢅS
L
L
251
one transmitter switching
Maximum Data Rate
ꢀbps
R = 3kΩꢀ C = ±50pFꢀ
L
L
460
one tranꢁsmtter ꢁwmtchmng (Note 1)
t
t
1.±5
1.±5
211
211
31
PꢃL
Receiver input to receiver output,
ꢁ = ±51pF
L
Receiver Propagation Delaꢅ
µs
PLꢃ
Receiver Output Enable Time
Receiver Output Disable Time
Time to Exit Shutdown
Transmitter Sꢀew
ns
ns
µs
ns
ns
V > 3.7V
T_OUT
t
- t
R = 3ꢀΩ, ꢁ = ±111pF (Note 3)
±11
51
PꢃL PLꢃ
L
L
Receiver Sꢀew
t
- t
PHL PLH
V
= +2.5V, T = +25°ꢁ,
A
ꢁꢁ
L
ꢁ = ±51pF to
L
±111pF
6
4
31
31
R = 3ꢀΩ to 7ꢀΩ,
Transition-Region Slew
Rate
measured from +3V
to -3V or -3V to +3V,
one transmitter switching
V/µs
ꢁ = ±51pF to
L
2511pF
Note 2: ꢂuaranteed bꢅ correlation.
Note 3: Transmitter sꢀew is measured at the transmitter zero crosspoint.
_______________________________________________________________________________________
3
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
Typical Operating Characteristics
(V
= V = +1.5Vꢀ T = +15°Cꢀ unbeꢁꢁ otherwmꢁe noteꢂ.)
CC
L
A
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
SLEW RATE vs. LOAD CAPACITANCE
5.0
2.5
0
16
14
12
SLEW RATE -
DATA RATE = 460kbps
10
LOAD = 3kΩ IN PARALLEL
8
6
4
2
0
SLEW RATE +
-2.5
-5.0
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
SUPPLY CURRENT
vs. LOAD CAPACITANCE
TRANSMITTER OUTPUT VOLTAGE
vs. DATA RATE
5.0
2.5
0
60
50
40
30
20
10
0
LOAD = 3kΩ
ONE TRANSMITTER SWITCHING
AT DATA RATE, OTHER
TRANSMITTERS AT 1/8
DATA RATE
460kbps
240kbps
LOAD = 3kΩ, 1000pF
ONE TRANSMITTER SWITCHING
AT DATA RATE, OTHER
TRANSMITTERS AT 1/8
DATA RATE
-2.5
-5.0
20kbps
150 200 250
0
1000
2000
3000
4000
5000
0
50 100
300 350 400 450
LOAD CAPACITANCE (pF)
DATA RATE (kbps)
ON-RESISTANCE
vs. SWIN VOLTAGE
LIN TO LOUT t
PD
70
65
60
55
50
45
T
= +85°C
A
LIN
T
= +25°C
A
1V/div
LOUT
T
= -40°C
A
R
= 1kΩ
PULLUP
200ns/div
0
0.5
1.0
V
1.5
(V)
2.0
2.5
SWIN
4
_______________________________________________________________________________________
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
-in Description
PIN
±
NAMꢀ
FUNCꢅION
Poꢁmtmve Tersmnab of the Vobtage-Douꢃber Charge-Pusp Capacmtor
+4.1V Suppby Generateꢂ ꢃy the Charge Pusp
C±+
V+
1
3
C±-
C1+
C1-
V-
Negatmve Tersmnab of the Vobtage-Douꢃber Charge-Pusp Capacmtor
Poꢁmtmve Tersmnab of the Invertmng Charge-Pusp Capacmtor
Negatmve Tersmnab of the Invertmng Charge-Pusp Capacmtor
-4.1V Suppby Generateꢂ ꢃy the Charge Pusp
4
5
6
T±INꢀ
T1INꢀ T3IN
7ꢀ 8ꢀ 9
CMOS Tranꢁsmtter Inputꢁ
±0
±±
LOUT
Hanꢂꢁhakmng Output. Thmꢁ output mꢁ actmve ꢂurmng ꢁhutꢂown for the MAX3389E.
Swmtch Output
SWOUT
R1OUTꢀ
R±OUT
±1ꢀ ±3
CMOS Recemver Outputꢁ. Swmng ꢃetween 0 anꢂ V .
L
±4
±5
±6
V
Logmc-Leveb Suppby. Abb CMOS mnputꢁ anꢂ outputꢁ are referreꢂ to thmꢁ ꢁuppby. V = +±.8V to +3.0V.
L
L
SWIN
LIN
Swmtch Input.
Hanꢂꢁhakmng Input. Thmꢁ mnput mꢁ actmve ꢂurmng ꢁhutꢂown for the MAX3389E.
R1INꢀ
R±IN
±7ꢀ ±8
RS-131 Recemver Inputꢁ
T3OUTꢀ
T1OUTꢀ
T±OUT
±9ꢀ 10ꢀ 1±
RS-131 Tranꢁsmtter Outputꢁ
11
13
14
GND
Grounꢂ
V
+1.35V to +3V Suppby Vobtage
CC
SHDN
Shutꢂown Input. 0 = ꢁhutꢂownꢀ ꢁwmtch open; ± = norsab operatmonꢀ ꢁwmtch cboꢁeꢂ.
_______________________________________________________________________________________
1
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
ꢅable ±. Shꢃtdown Logic ꢅrꢃth ꢅable
LOUꢅ
ꢅꢂANSMIꢅꢅꢀꢂ
OUꢅPUꢅS
ꢂꢀCꢀIVꢀꢂ
OUꢅPUꢅS
CHAꢂGꢀ
PUMP
SHDN
SWIꢅCH
MAX3388ꢀ
MAX3389ꢀ
LIN
L
Hmgh-Z
Actmve
Hmgh-Z
Actmve
Inactmve
Actmve
Open
Hmgh-Z
H
Cboꢁeꢂ
LIN
LIN
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
5V/div
2V/div
SHDN
T1
T2
I/O CHIP
POWER SUPPLY
V
L
MAX3388E
MAX3389E
V
= +2.5V
CC
C1–C4 = 0.1µF
L
C = 1000pF, R = 3kΩ
L
I/O
CHIP
WITH
UART
RS-232
10µs/div
CPU
Figure 2. Transmitter Outputs when Exiting Shutdown
The MAX3388E/MAX3389E’ꢁ tranꢁsmtterꢁ guarantee a
150kꢃpꢁ ꢂata rate wmth boaꢂꢁ of 3kΩ mn parabbeb wmth
±000pF anꢂ 460kꢃpꢁ ꢂata rate wmth boaꢂꢁ of 3kΩ mn parab-
beb wmth ±50pF. Fmgure ± ꢁhowꢁ a cospbete ꢁyꢁtes con-
nectmon.
Figure 1. Interface Under Control of PMU
Detailed Description
Theꢁe RS-131 output ꢁtageꢁ are turneꢂ off (hmgh
mspeꢂance) when the ꢂevmceꢁ are mn ꢁhutꢂown soꢂe.
When the power mꢁ offꢀ the MAX3388E/MAX3389E persmt
the outputꢁ to ꢃe ꢂrmven up to ±±1V.
Dual Chargeꢂ-ump
Voltage Converter
The MAX3388E/MAX3389E’ꢁ mnternab power ꢁuppby
conꢁmꢁtꢁ of a regubateꢂ ꢂuab charge pusp that provmꢂeꢁ
output vobtageꢁ of +4.1V (ꢂouꢃbmng charge pusp) anꢂ -
4.1V (mnvertmng charge pusp)ꢀ regarꢂbeꢁꢁ of the mnput
The tranꢁsmtter mnputꢁ ꢂo not have pubbup reꢁmꢁtorꢁ.
Connect unuꢁeꢂ mnputꢁ to GND or V .
L
Rꢁꢂ232 Receivers
vobtage (V ) over a +1.5V to +3.0V range. The charge
CC
The recemverꢁ convert RS-131 ꢁmgnabꢁ to CMOS-bogmc
output bevebꢁ. The MAX3388E/MAX3389E’ꢁ recemverꢁ
have mnvertmng outputꢁ. The outputꢁ are hmgh mspeꢂ-
ance mn ꢁhutꢂown.
puspꢁ operate mn a ꢂmꢁcontmnuouꢁ soꢂe: mf the output
vobtageꢁ are beꢁꢁ than 4.1Vꢀ the charge puspꢁ are
enaꢃbeꢂ; mf the output vobtageꢁ exceeꢂ 4.1Vꢀ the charge
puspꢁ are ꢂmꢁaꢃbeꢂ. Each charge pusp requmreꢁ fbymng
capacmtorꢁ (C±ꢀ C1) anꢂ reꢁervomr capacmtorꢁ (C3ꢀ C4)
to generate the V+ anꢂ V- ꢁuppbmeꢁ.
ꢁhutdown Mode
Suppby current fabbꢁ to beꢁꢁ than ±µA when the
MAX3388E/MAX3389E are pbaceꢂ mn ꢁhutꢂown soꢂe
(SHDN bogmc bow). When ꢁhut ꢂownꢀ the ꢂevmce’ꢁ charge
puspꢁ are turneꢂ offꢀ V+ ꢂecayꢁ to V ꢀ V- mꢁ pubbeꢂ to
CC
grounꢂꢀ the ꢁwmtch mꢁ openeꢂꢀ anꢂ the tranꢁsmtter outputꢁ
are ꢂmꢁaꢃbeꢂ (hmgh mspeꢂance). The tmse requmreꢂ to exmt
Rꢁꢂ232 Transmitters
The tranꢁsmtterꢁ are mnvertmng beveb tranꢁbatorꢁ that convert
CMOS-bogmc bevebꢁ to ±3.7V EIA/TIA-131-cospatmꢃbe
bevebꢁ.
6
_______________________________________________________________________________________
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
ꢁhutꢂown mꢁ typmcabby 30µꢁꢀ aꢁ ꢁhown mn Fmgure 1.
Connect SHDN to V mf the ꢁhutꢂown soꢂe mꢁ not uꢁeꢂ.
CC
R
R
C
D
In ꢁhutꢂown soꢂeꢀ the recemver outputꢁ are hmgh mspeꢂ-
1MΩ
1500Ω
ance (Taꢃbe ±).
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
V Logic ꢁupply Input
L
Unbmke other RS-131 mnterface ꢂevmceꢁ where the recemver
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
outputꢁ ꢁwmng ꢃetween 0 anꢂ V ꢀ the MAX3388E/
CC
C
STORAGE
CAPACITOR
s
MAX3389E feature a ꢁeparate bogmc ꢁuppby mnput (V )
L
100pF
that ꢁetꢁ V
for the recemver outputꢁ anꢂ ꢁetꢁ threꢁh-
OH
SOURCE
obꢂꢁ for the tranꢁsmtter mnputꢁ. Thmꢁ feature abbowꢁ a
great ꢂeab of fbexmꢃmbmty mn mnterfacmng to sany ꢂmfferent
typeꢁ of ꢁyꢁtesꢁ wmth ꢂmfferent bogmc bevebꢁ. Connect
thmꢁ mnput to the hoꢁt bogmc ꢁuppby (±.8V ≤ V ≤ V ).
L
CC
Abꢁo ꢁee the Typical PDA/Cell-Phone Application ꢁec-
tmon.
Figure 3a. Human Body ESD Test Model
±±5ꢀV EꢁD -rotection
Aꢁ wmth abb Maxms ꢂevmceꢁꢀ ESD-protectmon ꢁtructureꢁ are
mncorporateꢂ on abb pmnꢁ to protect agamnꢁt ESDꢁ encoun-
tereꢂ ꢂurmng hanꢂbmng anꢂ aꢁꢁesꢃby. The MAX3388E/
MAX3389E’ꢁ ꢂrmver outputꢁꢀ recemver mnputꢁꢀ the hanꢂ-
ꢁhakmng mnput LINꢀ anꢂ the ꢁwmtch tersmnab SWIN have
extra protectmon agamnꢁt ꢁtatmc ebectrmcmty. Maxms haꢁ
ꢂevebopeꢂ ꢁtate-of-the-art ꢁtructureꢁ to protect theꢁe pmnꢁ
agamnꢁt an ESD of ±±5kV wmthout ꢂasage. The ESD
ꢁtructureꢁ wmthꢁtanꢂ hmgh ESD mn abb ꢁtateꢁ: norsab opera-
tmonꢀ ꢁhutꢂownꢀ anꢂ powereꢂ ꢂown. After an ESD eventꢀ
Maxms’ꢁ “E” verꢁmon ꢂevmceꢁ keep workmng wmthout
batchupꢀ whereaꢁ cospetmng RS-131 proꢂuctꢁ can batch
anꢂ suꢁt ꢃe powereꢂ ꢂown to resove batchup. ESD pro-
tectmon can ꢃe teꢁteꢂ mn varmouꢁ wayꢁ. The tranꢁsmtter out-
putꢁ anꢂ recemver mnputꢁ of thmꢁ proꢂuct fasmby are
charactermzeꢂ for protectmon to the fobbowmng bmsmtꢁ:
I
100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
P
r
AMPERES
36.8%
10%
0
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
Figure 3b. Human Body Current Waveform
±) ±±5kV uꢁmng the Husan Boꢂy Moꢂeb
1) ±8kV uꢁmng the Contact Dmꢁcharge sethoꢂ ꢁpecmfmeꢂ
mn IEC ±000-4-1
IEC ±000ꢂ4ꢂ2
The IEC ±000-4-1 ꢁtanꢂarꢂ coverꢁ ESD teꢁtmng anꢂ
perforsance of fmnmꢁheꢂ equmpsent; mt ꢂoeꢁ not ꢁpecmfm-
cabby refer to ICꢁ. The MAX3388E/MAX3389E hebpꢁ you
ꢂeꢁmgn equmpsent that seetꢁ Leveb 4 (the hmgheꢁt beveb)
of IEC ±000-4-1ꢀ wmthout the neeꢂ for aꢂꢂmtmonab ESD-
protectmon cosponentꢁ.
3) ±±5kV uꢁmng IEC ±000-4-1’ꢁ Amr-Gap Dmꢁcharge
sethoꢂ
EꢁD Test Conditions
ESD perforsance ꢂepenꢂꢁ on a varmety of conꢂmtmonꢁ.
Contact Maxms for a rebmaꢃmbmty report that ꢂocusentꢁ
teꢁt ꢁetupꢀ sethoꢂobogyꢀ anꢂ reꢁubtꢁ.
The sajor ꢂmfference ꢃetween teꢁtꢁ ꢂone uꢁmng the
Husan Boꢂy Moꢂeb anꢂ IEC ±000-4-1 mꢁ hmgher peak
current mn IEC ±000-4-1ꢀ ꢃecauꢁe ꢁermeꢁ reꢁmꢁtance mꢁ
bower mn the IEC ±000-4-1 soꢂeb. Henceꢀ the ESD wmth-
ꢁtanꢂ vobtage seaꢁureꢂ to IEC ±000-4-1 mꢁ generabby
bower than that seaꢁureꢂ uꢁmng the Husan Boꢂy
Moꢂeb. Fmgure 4a ꢁhowꢁ the IEC ±000-4-1 soꢂebꢀ anꢂ
Fmgure 4ꢃ ꢁhowꢁ the current wavefors for the ±8kV IEC
±000-4-1 Leveb 4 ESD Contact Dmꢁcharge teꢁt.
Human Body Model
Fmgure 3a ꢁhowꢁ the Husan Boꢂy Moꢂebꢀ anꢂ Fmgure 3ꢃ
ꢁhowꢁ the current wavefors mt generateꢁ when ꢂmꢁ-
chargeꢂ mnto a bow mspeꢂance. Thmꢁ soꢂeb conꢁmꢁtꢁ of
a ±00pF capacmtor chargeꢂ to the ESD vobtage of mntereꢁtꢀ
whmch mꢁ then ꢂmꢁchargeꢂ mnto the teꢁt ꢂevmce through a
±.5kΩ reꢁmꢁtor.
_______________________________________________________________________________________
7
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
The Amr-Gap teꢁt mnvobveꢁ approachmng the ꢂevmce wmth a
chargeꢂ proꢃe. The contact ꢂmꢁcharge sethoꢂ connectꢁ
the proꢃe to the ꢂevmce ꢃefore the proꢃe mꢁ energmzeꢂ.
R
R
D
330Ω
C
50MΩ to 100MΩ
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
Machine Model
The Machmne Moꢂeb for ESD teꢁtꢁ abb pmnꢁ uꢁmng a
100pF ꢁtorage capacmtor anꢂ zero ꢂmꢁcharge reꢁmꢁ-
tance. Itꢁ oꢃjectmve mꢁ to esubate the ꢁtreꢁꢁ cauꢁeꢂ ꢃy
contact that occurꢁ wmth hanꢂbmng anꢂ aꢁꢁesꢃby ꢂurmng
sanufacturmng. Abb pmnꢁ requmre thmꢁ protectmon ꢂurmng
sanufacturmngꢀ not juꢁt RS-131 mnputꢁ anꢂ outputꢁ.
Thereforeꢀ after PC ꢃoarꢂ aꢁꢁesꢃbyꢀ the Machmne
Moꢂeb mꢁ beꢁꢁ rebevant to I/O portꢁ.
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
s
150pF
STORAGE
CAPACITOR
SOURCE
__________Applications Information
Figure 4a. IEC 1000-4-2 ESD Test Model
Capacitor ꢁelection
The capacmtor type uꢁeꢂ for C±–C4 mꢁ not crmtmcab for
proper operatmon; pobarmzeꢂ or nonpobarmzeꢂ capacmtorꢁ
can ꢃe uꢁeꢂ. The charge pusp requmreꢁ 0.±µF capacmtorꢁ
for 1.5V operatmon (Taꢃbe 1). Do not uꢁe vabueꢁ ꢁsabber
than thoꢁe bmꢁteꢂ mn Taꢃbe 1. Increaꢁmng the capacmtor
vabueꢁ (e.g.ꢀ ꢃy a factor of 1) reꢂuceꢁ rmppbe on the
tranꢁsmtter outputꢁ anꢂ ꢁbmghtby reꢂuceꢁ power con-
ꢁusptmon. C1ꢀ C3ꢀ anꢂ C4 can ꢃe mncreaꢁeꢂ wmthout
changmng C±’ꢁ vabue. Howeverꢀ ꢂo not mncreaꢁe C±
wmthout abꢁo mncreaꢁmng the vabueꢁ of C1ꢀ C3ꢀ anꢂ C4 to
samntamn the proper ratmoꢁ (C± to the other capacmtorꢁ).
I
100%
90%
When uꢁmng the smnmsus requmreꢂ capacmtor vabueꢁꢀ
sake ꢁure the capacmtor vabue ꢂoeꢁ not ꢂegraꢂe
exceꢁꢁmveby wmth tesperature. If mn ꢂouꢃtꢀ uꢁe capacmtorꢁ
wmth a barger nosmnab vabue. The capacmtor’ꢁ equmvabent
ꢁermeꢁ reꢁmꢁtance (ESR)ꢀ whmch uꢁuabby rmꢁeꢁ at bow tes-
peratureꢁꢀ mnfbuenceꢁ the asount of rmppbe on V+ anꢂ V-.
10%
t
t
= 0.7ns to 1ns
R
30ns
60ns
-owerꢂꢁupply Decoupling
In soꢁt cmrcusꢁtanceꢁꢀ a 0.±µF ꢃypaꢁꢁ capacmtor mꢁ
aꢂequate. In appbmcatmonꢁ that are ꢁenꢁmtmve to power-
ꢁuppby nomꢁeꢀ ꢂecoupbe V to grounꢂ wmth a capacmtor of
CC
Figure 4b. IEC 1000-4-2 ESD Generator Current Waveform
the ꢁase vabue aꢁ charge-pusp capacmtor C±. Connect
ꢃypaꢁꢁ capacmtorꢁ aꢁ cboꢁe to the IC aꢁ poꢁꢁmꢃbe.
Transmitter Outputs when
Exiting ꢁhutdown
ꢅable 2. Minimꢃm ꢂeqꢃired Capacitor
Valꢃes
Fmgure 1 ꢁhowꢁ two tranꢁsmtter outputꢁ when exmtmng
ꢁhutꢂown soꢂe. Aꢁ they ꢃecose actmveꢀ the two
tranꢁsmtter outputꢁ are ꢁhown gomng to oppoꢁmte RS-131
bevebꢁ (one tranꢁsmtter mnput mꢁ hmgh; the other mꢁ bow).
Each tranꢁsmtter mꢁ boaꢂeꢂ wmth 3kΩ mn parabbeb wmth
±000pF. The tranꢁsmtter outputꢁ ꢂmꢁpbay no rmngmng or
unꢂeꢁmraꢃbe tranꢁmentꢁ aꢁ they cose out of ꢁhutꢂown.
Note that the tranꢁsmtterꢁ are enaꢃbeꢂ onby when the
sagnmtuꢂe of V- exceeꢂꢁ approxmsateby 1.5V.
V
(V)
C±–C4
(µF)
CC
1.5 to 3.0
0.±
8
_______________________________________________________________________________________
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
High Data Rates
The MAX3388E/MAX3389E samntamn RS-131-cospatmꢃbe
tranꢁsmtter output vobtageꢁ even at hmgh ꢂata rateꢁ. Fmgure
5 ꢁhowꢁ a tranꢁsmtter boopꢃack teꢁt cmrcumt. Fmgure 6 ꢁhowꢁ
a boopꢃack teꢁt reꢁubt at 150kꢃpꢁꢀ anꢂ Fmgure 7 ꢁhowꢁ the
ꢁase teꢁt at 460kꢃpꢁ. For Fmgure 6ꢀ abb tranꢁsmtterꢁ were
ꢂrmven ꢁmsubtaneouꢁby at 150kꢃpꢁ mnto RS-131 boaꢂꢁ mn
parabbeb wmth ±000pF. For Fmgure 7ꢀ a ꢁmngbe tranꢁsmtter waꢁ
ꢂrmven at 460kꢃpꢁꢀ anꢂ abb tranꢁsmtterꢁ were boaꢂeꢂ wmth
an RS-131 recemver mn parabbeb wmth ±50pF.
V
CC
0.1µF
V
CC
C1+
V+
V-
C3
C4
C1
MAX3388E
MAX3389E
C1-
C2+
-ower ꢁwitch
The MAX3388E/MAX3389E contamn an mnternab ꢁwmtch
for powermng externab cmrcumtry. Thmꢁ can ꢃe uꢁeꢂ to
power hot-ꢁync cmrcumtry or other bow-power cmrcumtry.
The ꢁwmtch on- reꢁmꢁtance mꢁ typmcabby 61Ω. The SWIN
ꢁmꢂe of the ꢁwmtch mꢁ ESD protecteꢂ to ±±5kV.
C2
C2-
T_ OUT
T_ IN
LogicꢂLevel I/O
In aꢂꢂmtmon to the traꢂmtmonab RS-131 I/Oꢀ the
MAX3388E/MAX3389E have a bogmc-beveb tranꢁcemver
fros the RS-131 connector ꢁmꢂe to the CMOS-bogmc
ꢁmꢂe. The mnput mspeꢂance mꢁ typmcabby 30kΩꢀ anꢂ the
output mꢁ open ꢂramn. The bogmc beveb I/O mꢁ actmve ꢂurmng
ꢁhutꢂown for the MAX3389E.
Thmꢁ I/O tranꢁcemver mꢁ uꢁefub for hot ꢁyncmng or other
ꢂeꢂmcateꢂ cossunmcatmon capaꢃmbmty. The mnput mꢁ ESD
protecteꢂ to ±±5kV.
R_ IN
R_ OUT
SHDN
5kΩ
C
L
V
CC
GND
Typical -DA/Cellꢂ-hone Application
The MAX3388E/MAX3389E ꢂeꢁmgneꢂ wmth PDA appbmca-
tmonꢁ mn smnꢂ. Two tranꢁsmtterꢁ anꢂ two recemverꢁ hanꢂbe
ꢁtanꢂarꢂ fubb-ꢂupbex cossunmcatmon protocobꢀ whmbe an
extra tranꢁsmtter abbowꢁ a rmng mnꢂmcator (RI) ꢁmgnab to abert
the UART on the PC. Wmthout the rmng mnꢂmcator tranꢁsmt-
terꢀ ꢁobutmonꢁ for theꢁe appbmcatmonꢁ woubꢂ requmre ꢁoft-
ware-mntenꢁmve pobbmng of the craꢂbe mnputꢁ.
The RI ꢁmgnab mꢁ generateꢂ when a PDAꢀ cebbubar phoneꢀ or
other “craꢂbeꢂ” ꢂevmce mꢁ pbuggeꢂ mnto mtꢁ craꢂbe. Thmꢁ
generateꢁ a bogmc-bow ꢁmgnab to RI tranꢁsmtter mnputꢀ creat-
mng +3.7V at the rmng mnꢂmcate pmn. The PC’ꢁ UART RI mnput
mꢁ the onby pmn that can generate an mnterrupt fros ꢁmgnabꢁ
arrmvmng through the RS-131 port. The mnterrupt routmne for
thmꢁ UART wmbb then ꢁervmce the RS-131 fubb-ꢂupbex cos-
sunmcatmon ꢃetween the PDA anꢂ the PC.
Figure 5. Loopback Test Circuit
2V/div
5V/div
T1IN
T1OUT
R1OUT
5V/div
Aꢁ cebb phone ꢂeꢁmgn ꢃecoseꢁ sore bmke that of PDAꢁꢀ
cebb phoneꢁ wmbb requmre ꢁmsmbar ꢂockmng aꢃmbmty anꢂ cos-
sunmcatmon protocob. Cebb phoneꢁ operate on a ꢁmngbe
bmthmus-mon (Lm+) ꢃattery anꢂ generate a regubateꢂ out-
put vobtage of +1.35V to +3V fros the phone connector.
The ꢃaꢁeꢃanꢂ bogmc cosmng fros the phone connector
can ꢃe aꢁ bow aꢁ ±.8V at the tranꢁcemverꢁ. To prevent
forwarꢂ ꢃmaꢁmng of a ꢂevmce mnternab to the cebb phoneꢀ
the MAX3388E/MAX3389E cose wmth a bogmc power-
C = 1000pF
L
1µs/div
Figure 6. Loopback Test Results at 250kbps
ꢁuppby pmn (V ) that bmsmtꢁ the bogmc bevebꢁ preꢁenteꢂ to
L
_______________________________________________________________________________________
9
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
the phone. The recemver outputꢁ wmbb ꢁmnk to zero for bow
outputꢁꢀ ꢃut wmbb not exceeꢂ V for bogmc hmghꢁ. The
L
mnput bogmc bevebꢁ for the tranꢁsmtterꢁ are abꢁo abtereꢂꢀ
ꢁcabeꢂ ꢃy the sagnmtuꢂe of the V mnput. The ꢂevmceꢁ
L
2V/div
5V/div
T1IN
wmbb work wmth V aꢁ bow aꢁ ±.8V. Thmꢁ mꢁ uꢁefub wmth cebb
L
phoneꢁ anꢂ other power-effmcment ꢂevmceꢁ wmth core
bogmc vobtage bevebꢁ that go aꢁ bow aꢁ ±.8V.
T1OUT
Chip Information
TRANSISTOR COUNT: ±313
R1OUT
5V/div
C = 150pF
L
1µs/div
Figure 7. Loopback Test Results at 460kbps
±0 ______________________________________________________________________________________
2.5V, ±±5ꢀV EꢁDꢂ-rotected Rꢁꢂ232
Transceivers for -DAs and Cell -hones
-acꢀage 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.
Maxim Integrated -roducts, ±20 ꢁan Gabriel Drive, ꢁunnyvale, CA 94086 408ꢂ737ꢂ7600_____________________±±
© 100± Maxms Integrateꢂ Proꢂuctꢁ
Prmnteꢂ USA
mꢁ a regmꢁtereꢂ traꢂesark of Maxms Integrateꢂ Proꢂuctꢁ.
相关型号:
MAX3389ECUG+
Line Transceiver, 2 Func, 3 Driver, 2 Rcvr, PDSO24, 4.40 MM, 0.65 MM PITCH, TSSOP-24
MAXIM
MAX338CEE+T
Single-Ended Multiplexer, 1 Func, 8 Channel, CMOS, PDSO16, 0.150 INCH, ROHS COMPLIANT, QSOP-16
MAXIM
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