LTC1338IS#TRPBF [Linear]
LTC1338IS#TRPBF;
| 型号： | LTC1338IS#TRPBF |
| 厂家： | 
Linear |
| 描述： | LTC1338IS#TRPBF 驱动器 |
| 文件： | 总8页 (文件大小：223K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1338
5V Low Power RS232
5-Driver/3-Receiver Transceiver
U
DESCRIPTIO
EATURE
S
F
■
■
■
■
■
■
■
■
■
Low Supply Current: 500µA
0.2µA Supply Current in SHUTDOWN
50µA Supply Current in RECEIVER ALIVE Mode
ESD Protection Over ±10kV
Operates from a Single 5V Supply
Uses Small Capacitors: 0.1µF
Operates to 120k Baud
Three-State Outputs Are High Impedance When Off
Output Overvoltage Does Not Force Current
Back into Supplies
The LTC1338 is a 5-driver/3-receiver RS232 trans-
ceiver with very low supply current. In the no load
condition, thesupplycurrentisonly500µA. Thecharge
pump only requires four 0.1µF capacitors.
In SHUTDOWN mode, the supply current is further
reduced to 0.2µA. In RECEIVER ALIVE mode, all three
receivers are kept alive and the supply current is 50µA.
All RS232 outputs assume a high impedance state in
SHUTDOWN and with the power off.
The LTC1338 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud with a 2500pF, 3kΩ load. Both
driver outputs and receiver inputs can be forced to
±25V without damage, and can survive multiple±10kV
ESD strikes.
■
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
Flowthrough Architecture
■
O U
PPLICATI
S
A
■
■
■
■
Battery-Powered Modems
Battery-Powered DCE
Notebook Computers
Palmtop Computers
U
O
TYPICAL APPLICATI
Supply Current
5-Drivers/3-Receivers with SHUTDOWN
1.2
1.0
0.8
0.6
0.4
0.2
0
1200
1000
800
600
400
200
0
–
+
V
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
LTC1338
C1
0.1µF
C4
0.1µF
V
CC
C3
0.1µF
3
C2
0.1µF
4
DRIVER 1 IN
DRIVER 2 IN
RX1 OUT
5
DRIVER 1 OUT
DRIVER 2 OUT
RX1 IN
QUIESCENT
CURRENT
6
7
DRIVER 3 IN
RX2 OUT
8
DRIVER 3 OUT
RX2 IN
SHUTDOWN
CURRENT
9
DRIVER 4 IN
RX3 OUT
10
11
12
13
14
DRIVER 4 OUT
RX3 IN
DRIVER 5 IN
GND
–40
0
20
40
60
80 100
–20
DRIVER 5 OUT
RX ENABLE
NC
TEMPERATURE (°C)
DRIVER ENABLE
NC
TEST CONDITION:
= 5V, ALL DRIVER INPUTS TIED TO V
LTC1338 • TA02
V
.
CC
CC
LTC1338 • TA01
1
LTC1338
W W W
U
/O
ABSOLUTE AXI U RATI GS
PACKAGE RDER I FOR ATIO
(Note 1)
TOP VIEW
Supply Voltage (VCC) ................................................ 6V
Input Voltage
Driver ....................................... –0.3V to VCC + 0.3V
Receiver ............................................... – 25V to 25V
Driver/Receiver Enable Pin ........ –0.3V to VCC + 0.3V
Output Voltage
ORDER PART
NUMBER
+
–
V
1
2
3
4
5
6
7
8
9
28
V
+
–
V
27 C2
26 C2
CC
+
C1
C1
–
25 DR1 IN
24 DR2 IN
23 RX1 OUT
22 DR3 IN
21 RX2 OUT
20 DR4 IN
19 RX3 OUT
18 DR5 IN
17 GND
LTC1338CG
LTC1338CN
LTC1338CS
LTC1338IG
LTC1338IN
LTC1338IS
DR1 OUT
DR2 OUT
RX1 IN
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short Circuit Duration
DR3 OUT
RX2 IN
DR4 OUT 10
RX3 IN 11
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range
DR5 OUT 12
RX ENABLE 13
16 DR ENABLE
15 NC
NC
14
G PACKAGE
28-LEAD SSOP
N PACKAGE
28-LEAD PLASTIC DIP
Commercial (LTC1338C) ........................ 0°C to 70°C
Industrial (LTC1338I) ........................ –40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
S PACKAGE
28-LEAD PLASTIC SOL
TJMAX = 125°C, θJA = 96°C/W (G)
TJMAX = 125°C, θJA = 56°C/W (N)
JMAX = 125°C, θJA = 85°C/W (S)
T
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing
3k to GND
Positive
Negative
●
●
5.0
–5.0
7.0
– 6.5
V
V
Logic Input Voltage Level
Input Low Level (V
Input High Level (V
= High)
= Low)
●
●
1.4
1.4
0.8
V
V
µA
mA
µA
OUT
2.0
0.8
OUT
Logic Input Current
0 ≤ V ≤ V
●
±5
IN
CC
Output Short-Circuit Current
Output Leakage Current
Any Receiver
V
OUT
= 0V
±12
±10
SHUTDOWN, V
= ±20V (Note 3)
●
±500
OUT
Input Voltage Thresholds
Input Low Threshold
Input High Threshold
●
●
1.3
1.7
0.4
5
0.2
4.8
V
V
V
kΩ
V
V
2.4
1
7
Hysteresis
Input Resistance
Output Voltage
●
0.1
3
–10V ≤ V ≤ 10V
IN
Output Low, I
Output High, I
= – 1.6mA (V = 5V)
= 160µA (V = 5V)
●
●
0.4
OUT
CC
3.5
OUT
CC
Output Short-Circuit Current
Output Leakage Current
Power Supply Generator
Sinking Current, V
SHUTDOWN, 0 ≤ V
= V
–15
–40
1
mA
µA
OUT
CC
≤ V (Note 3)
●
10
OUT
CC
+
V Output Voltage
I
I
= 0mA
= 12mA
8.0
7.5
–8.0
–7.0
V
V
V
V
OUT
OUT
–
V Output Voltage
I
I
= 0mA
= –12mA
OUT
OUT
Supply Rise Time
SHUTDOWN to Turn-On
0.2
ms
2
LTC1338
DC ELECTRICAL CHARACTERISTICS V
CC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply
V
Supply Current
No Load (All Driver V = V )(Note 2) 0°C ≤ T ≤ 70°C
0.5
1.0
0.5
1.0
50
0.2
1.4
1.4
1.0
1.5
1.5
2.0
80
10
0.8
mA
mA
mA
mA
µA
µA
V
CC
IN
CC
A
No Load (All Driver V = 0V)(Note 2) 0°C ≤ T ≤ 70°C
IN
A
No Load (All Driver V = V )(Note 2) –40°C ≤ T ≤ 85°C
IN
CC
A
No Load (All Driver V = 0V)(Note 2) –40°C ≤ T ≤ 85°C
IN
A
RECEIVER ALIVE Mode (Note 4)
SHUTDOWN (Note 3)
●
●
●
●
Supply Leakage Current (V
Driver/Receiver Enable Threshold Low
Driver/Receiver Enable Threshold High
)
CC
2.0
V
AC CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
CONDITIONS MIN
R = 3k, C = 51pF
PARAMETER
TYP
MAX
UNITS
Slew Rate
8
5
30
V/µs
V/µs
L
L
R = 3k, C = 2500pF
3
L
L
Driver Propagation Delay
(TTL to RS232)
t
t
(Figure 1)
(Figure 1)
●
●
2
2
3.5
3.5
µs
µs
HLD
LHD
Receiver Propagation Delay
(RS232 to TTL)
t
t
(Figure 2)
(Figure 2)
●
●
0.3
0.2
0.8
0.8
µs
µs
HLR
LHR
The
●
denotes specifications which apply over the operating temperature
Note 3: Supply current and leakage current measurements in SHUTDOWN
are performed with V and V = 0V.
range of 0°C to 70°C or –40°C to 85°C.
DRIVER ENABLE
RECEIVER ENABLE
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
Note 4: Supply current measurement in RECEIVER ALIVE mode is
performed with V = 0V and V = V
.
CC
DRIVER ENABLE
RECEIVER ENABLE
Note 2: Supply current is measured with driver and receiver outputs
unloaded. The V
and V
= V .
RECEIVER ENABLE CC
DRIVER ENABLE
W U
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
Receiver Input Thresholds
Supply Current vs Data Rate
10
8
2.2
2.0
1.8
1.6
60
R
L
= 3k
V
= 5V
CC
OUTPUT HIGH
= 5V
R
= 3k
L
L
V
CC
50
40
30
C
= 2500pF
6
5 DRIVERS ACTIVE
V
CC
= 4.5V
4
V
2
TH
0
–2
–4
–6
1.4
1.2
1.0
20
10
0
V
OUTPUT LOW
= 4.5V
TL
V
CC
V
CC
= 5V
–8
80
DATA RATE (k BAUD)
120 140
–40 –20
0
20
80 100
40
TEMPERATURE (˚C)
80
100
0
20
40
60
100
40
60
–40 –20
0
20
60
TEMPERATURE (°C)
LTC1338 • TPC01
LTC1338 • TPC03
LTC1338 • TPC02
3
LTC1338
TYPICAL PERFOR A CE CHARACTERISTICS
W U
VCC Supply Current
Driver Leakage in Shutdown
Driver Short-Circuit Current
50
40
30
20
10
0
20
18
16
14
12
10
8
30
25
20
15
5 DRIVERS LOADED
= 3k
R
L
–
I
SC
V
= –20V
OUT
+
I
SC
10
5
1 DRIVER LOADED
V
OUT
= 20V
6
R
L
= 3k
4
0
0
–40
0
20
40
60
80 100
–20
40
80
100
–40 –20
0
20
60
–40 –20
0
20
80 100
40
60
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1338 • TPC05
LTC1338 • TPC04
LTC1338 • TPC06
Receiver Short-Circuit Current
Driver Output Waveforms
Receiver Output Waveforms
60
50
40
30
20
10
DRIVER
OUTPUT
RECEIVER
OUTPUT
R
L = 3k
C
L = 2500pF
C
L = 50pF
DRIVER
OUTPUT
–
I
SC
R
L = 3k
INPUT
INPUT
+
I
SC
LTC1338 • TPC08
LTC1338 • TPC09
–40
0
20
40
60
80 100
–20
TEMPERATURE (°C)
LTC1338 • TPC07
U
U
U
PI FU CTIO S
VCC: 5V Input Supply Pin. Supply current less than 0.2µA chargestorage. Thecapacitormaybetiedtogroundor5V.
in the SHUTDOWN mode. This pin should be decoupled With multiple devices, the V + and V– pins may be paral-
with a 0.1µF ceramic capacitor.
leled into common capacitors. For large numbers of
devices,increasingthesizeofthesharedcommonstorage
capacitors is recommended to reduce ripple.
V–: Negative Supply Output (RS232 Drivers). V – 2VCC
–1.5V.ThispinrequiresanexternalcapacitorC=0.1µFfor
charge storage.
C1+,C1–,C2+,C2–:CommutatingCapacitorInputs.These
pins require two external capacitors C = 0.1µF: one from
C1+ to C1–, and another from C2+ to C2–. To maintain
charge pump efficiency, the capacitor’s effective series
resistance should be less than 20Ω.
GND: Ground Pin.
RECEIVER ENABLE: TTL/CMOS Compatible Enable Pin.
Refer to Table 1 for its functional description. This pin can
not float.
DRIVER ENABLE: TTL/CMOS Compatible Enable Pin. Re-
fertoTable1foritsfunctionaldescription. Thispincannot
float.
V+: Positive Supply Output (RS232 Drivers). V+ 2VCC
1V. This pin requires an external capacitor C = 0.1µF for
–
4
LTC1338
U
U
U
PI FU CTIO S
RX IN: Receiver Inputs. These pins can be forced to ±25V
withoutdamage. Thereceiverinputsareprotectedagainst
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to VCC.
DRIVER OUT: Driver Outputs at RS232 Voltage Levels.
Outputs are in a high impedance state when in SHUT-
DOWN, RECEIVER ALIVE mode or VCC = 0V. The driver
outputs are protected against ESD to ±10kV for human
body model discharges.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. Outputs are in a high impedance state when in SHUT-
DOWN or RECEIVER DISABLE mode to allow data line
sharing.
Table 1. Functional Description
MODE
RX ENABLE
DR ENABLE
DRIVERS
RECEIVERS
I
CC
(µA)(TYP)
SHUTDOWN
0
0
All driver outputs are
high impedance.
All receiver outputs are
high impedance.
0.2
Receiver Disable
0
1
All drivers alive.
All receiver outputs are
high impedance.
500
RECEIVER ALIVE
Normal
1
1
0
1
All driver outputs are
high impedance.
All drivers alive.
All receivers alive.
50
All receivers alive.
500
U
W
W
SWITCHI G TI E WAVEFOR S
V
V
CC
CC
1.7V
RX
DRIVER
1.3V
1.4V
INPUT
1.4V
INPUT
0V
V
0V
+
V
CC
RX
OUTPUT
DRIVER
OUTPUT
2.4V
0V
0V
0.8V
–
V
0V
t
t
LHR
t
t
LHD
HLD
HLR
LTC1338 • F01
LTC1338 • F02
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
5
LTC1338
TEST CIRCUITS
Receiver Timing Test Load
Driver Timing Test Load
RX
OUTPUT
DRIVER
OUTPUT
DRIVER
INPUT
RX INPUT
RX
DRIVER
51pF
51pF
3k
LTC1338 • F04
LTC1338 • F03
ESD Test Circuit
–
+
V
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
LTC1338
C1
0.1µF
C4
0.1µF
V
CC
C3
0.1µF
3
C2
0.1µF
4
DRIVER 1 IN
DRIVER 2 IN
RX1 OUT
5
DRIVER 1 OUT
DRIVER 2 OUT
RX1 IN
6
7
RS232
LINE PINS
PROTECTED
TO ±10kV
DRIVER 3 IN
RX2 OUT
8
DRIVER 3 OUT
RX2 IN
9
DRIVER 4 IN
RX3 OUT
10
11
12
13
14
DRIVER 4 OUT
RX3 IN
DRIVER 5 IN
GND
DRIVER 5 OUT
RX ENABLE
NC
DRIVER ENABLE
NC
LTC1338 • TC01
6
LTC1338
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
G Package
28-Lead SSOP
0.397 – 0.407*
(10.07 – 10.33)
0.205 – 0.212*
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
28 27 26 25 24 23 22 21 20 19 18
16 15
17
0° – 8°
0.301 – 0.311
(7.65 – 7.90)
0.045
(1.14)
0.0256
0.022 – 0.037
0.005 – 0.009
(0.65)
BSC
(0.55 – 0.95)
(0.13 – 0.22)
0.002 – 0.008
(0.05 – 0.21)
0.010 – 0.015
(0.25 – 0.38)
5
7
8
1
2
3
4
6
9
10 11 12 13 14
0.045
(1.14)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
N Package
28-Lead Plastic DIP
1.455
(36.957)
MAX
0.070
(1.778)
TYP
0.600 – 0.625
(15.240 – 15.875)
0.130 ± 0.005
(3.302 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.015
(0.381)
MIN
0.505 – 0.560
(12.827 – 14.224)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.035 – 0.080
(0.889 – 2.032)
0.125
(3.175)
MIN
0.625
0.018 ± 0.003
(0.457 ± 0.076)
–0.015
+0.635
15.87
1
2
3
4
5
6
7
8
9
10 11 12 13 14
0.100 ± 0.010
(2.540 ± 0.254)
(
)
–0.381
S Package
28-Lead SOL
0.697 – 0.712
(17.70 – 18.08)
(NOTE 2)
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.037 – 0.045
(0.940 – 1.143)
0.005
(0.127)
RAD MIN
0.093 – 0.104
(2.362 – 2.642)
28 27 26 25 24 23 22 21 20 19 18
16 15
17
0.010 – 0.029
(0.254 – 0.737)
× 45°
0° – 8° TYP
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
0.050
(1.270)
TYP
0.009 – 0.013
(0.229 – 0.330)
0.014 – 0.019
(0.356 – 0.482)
0.004 – 0.012
(0.102 – 0.305)
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
NOTE:
1
2
3
5
7
8
9 10 11 12 13 14
4
6
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.
2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1338
U.S. Area Sales Offices
SOUTHWEST REGION
Linear Technology Corporation
22141 Ventura Blvd.
SOUTHEAST REGION
Linear Technology Corporation
17060 Dallas Parkway
Suite 208
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
NORTHEAST REGION
Linear Technology Corporation
One Oxford Valley
2300 E. Lincoln Hwy.,Suite 306
Langhorne, PA 19047
Phone: (215) 757-8578
FAX: (215) 757-5631
Suite 206
Woodland Hills, CA 91364
Phone: (818) 703-0835
FAX: (818) 703-0517
NORTHWEST REGION
Linear Technology Corporation
782 Sycamore Dr.
CENTRAL REGION
Linear Technology Corporation
Chesapeake Square
Linear Technology Corporation
266 Lowell St., Suite B-8
Wilmington, MA 01887
Milpitas, CA 95035
Phone: (408) 428-2050
FAX: (408) 432-6331
229 Mitchell Court, Suite A-25
Addison, IL 60101
Phone: (708) 620-6910
FAX: (708) 620-6977
Phone: (508) 658-3881
FAX: (508) 658-2701
International Sales Offices
KOREA
FRANCE
Linear Technology Korea Branch
Namsong Building, #505
Itaewon-Dong 260-199
Yongsan-Ku, Seoul
Korea
TAIWAN
Linear Technology S.A.R.L.
Immeuble "Le Quartz"
58 Chemin de la Justice
92290 Chatenay Malabry
France
Linear Technology Corporation
Rm. 801, No. 46, Sec. 2
Chung Shan N. Rd.
Taipei, Taiwan, R.O.C.
Phone: 886-2-521-7575
FAX: 886-2-562-2285
Phone: 82-2-792-1617
FAX: 82-2-792-1619
Phone: 33-1-41079555
FAX: 33-1-46314613
SINGAPORE
UNITED KINGDOM
GERMANY
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Linear Techonolgy GMBH
Untere Hauptstr. 9
D-85386 Eching
Germany
Phone: 65-293-5322
FAX: 65-292-0398
Phone: 44-276-677676
FAX: 44-276-64851
Phone: 49-89-3197410
FAX: 49-89-3194821
JAPAN
Linear Technology KK
5F YZ Bldg.
4-4-12 Iidabashi, Chiyoda-Ku
Tokyo, 102 Japan
Phone: 81-3-3237-7891
FAX: 81-3-3237-8010
World Headquarters
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Phone: (408) 432-1900
FAX: (408) 434-0507
08/16/93
LT/GP 1093 10K REV 0 • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1993
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
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