LTC1384CS [Linear]
5V Low Power RS232 Transceiver with 2 Receivers Active in Shutdown; 5V低功耗RS232收发器， 2个接收器活跃在关断
| 型号： | LTC1384CS |
| 厂家： | 
Linear |
| 描述： | 5V Low Power RS232 Transceiver with 2 Receivers Active in Shutdown |
| 文件： | 总8页 (文件大小：219K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1384
5V Low Power RS232
Transceiver with 2 Receivers
Active in Shutdown
U
DESCRIPTIO
EATURE
S
F
■
■
■
Operates from a Single 5V Supply
Low Supply Current: ICC = 220µA
ICC = 35µA in Shutdown Mode with Both
Receivers Kept Alive
ESD Protection Over ±10kV
Uses Small Capacitors: 0.1µF
Operates to 120kBaud
Output Overvoltage Does Not Force Current
Back into Supplies
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
The LTC1384 is an ultra-low power 2-driver/2-receiver
RS232 transceiver that operates from a single 5V
supply. The charge pump requires only four space-
saving 0.1µF capacitors.
■
■
■
■
Thetransceiveroperatesinoneoftwomodes, Normaland
Shutdown. In the Normal mode, ICC is only 220µA with the
driver outputs unloaded. In the Shutdown mode, the
charge pump is turned off, the driver outputs are forced
into three-state, both receivers are kept active and ICC
drops to 35µA. The receiver outputs may be forced into
three-state at any time using the receiver enable (EN) pin.
■
■
Pin Compatible with LT1180A
The LTC1384 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud 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.
O U
PPLICATI
S
A
■
Notebook Computers
Palmtop Computers
■
U
O
TYPICAL APPLICATI
Quiescent and Shutdown Supply Current
vs Temperature
2-Drivers/2-Receivers with Shutdown
and Receiver Enable
1200
1000
800
600
400
200
0
60
50
40
30
20
10
0
2
4
5
6
17
TEST CONDITION: V = 5V
V
= 5V
CC
CC
0.1µF
0.1µF
3
0.1µF
LTC1384
7
SHUTDOWN
CURRENT
0.1µF
V
V
CC
CC
300k
12
15
LOGIC INPUT
232 OUTPUT
QUIESCENT
CURRENT
300k
11
13
8
LOGIC INPUT
232 OUTPUT
232 INPUT
14
LOGIC OUTPUT
5k
5k
–20
20
40
60
80
0
TEMPERATURE (°C)
10
18
9
LOGIC OUTPUT
ON/OFF
232 INPUT
LTC1384 • TA02
16
LTC1384 • TA01
1
RX EN
1
LTC1384
W W W
U
ABSOLUTE AXI U RATI GS
Supply Voltage (VCC) ................................................ 6V
Input Voltage
Short-Circuit Duration
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Driver ....................................... –0.3V to VCC + 0.3V
Receiver ............................................... – 25V to 25V
Digital Input............................... –0.3V to VCC + 0.3V
Output Voltage
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
W
U
/O
PACKAGE RDER I FOR ATIO
TOP VIEW
TOP VIEW
ORDER PART
ORDER PART
RX EN
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
ON/OFF
VCC
NUMBER
NUMBER
1
2
3
4
5
6
7
8
9
ON/OFF
18
17
16
15
14
13
12
11
10
RX EN
+
C1
+
V
C1
CC
+
V
GND
+
GND
LTC1384CG
V
LTC1384CN
LTC1384CS
–
C1
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
NC
–
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
C1
+
C2
+
C2
–
C2
–
C2
–
V
–
V
TR2 OUT
RX2 IN
TR2 OUT
RX2 IN
NC 10
N PACKAGE
S PACKAGE
G PACKAGE
18-LEAD PLASTIC DIP 18-LEAD PLASTIC SOL
20-LEAD SSOP
TJMAX = 125°C, θJA = 56°C/W
TJMAX = 125°C, θJA = 135°C/W
Consult factory for Industrial and Military grade parts.
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, EN = 0V, 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
Logic Input Current
Input Low Level (V
Input High Level (V
= High)
= Low)
●
●
1.4
1.4
0.8
V
V
µA
µA
mA
µA
OUT
2.0
OUT
V
IN
V
IN
= V
= 0V
●
●
5
–40
CC
–20
±12
±10
Output Short-Circuit Current
Output Leakage Current
Any Receiver
V
OUT
= 0V
Shutdown or V = 0V (Note 3), V
= ±20V
●
±500
CC
OUT
Input Voltage Thresholds
Input Low Threshold
Input High Threshold
●
●
0.8
1.3
1.7
0.4
5
0.2
3.2
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
3.0
OUT
CC
2
LTC1384
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, EN = 0V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Short-Circuit Current
Sinking Current, V
Sourcing Current, V
= V
–15
10
–40
20
mA
mA
OUT
CC
= 0V
OUT
Output Leakage Current
EN = V , 0V ≤ V
≤ V
CC
●
1
10
µA
CC
OUT
Power Supply Generator
+
V Output Voltage
I
I
I
I
= 0mA
= 8mA
= 0mA
8.0
7.5
–8.0
–7.0
V
V
V
V
OUT
OUT
–
V Output Voltage
OUT
OUT
= –8mA
Supply Rise Time
Shutdown to Turn-On
0.2
ms
Power Supply
V
Supply Current
No Load (Note 2)
Shutdown (Note 3)
●
●
●
●
0.22
35
1.4
1.4
0.5
50
0.8
mA
µA
V
CC
Supply Leakage Current (V
Digital Input Threshold Low
Digital Input Threshold High
)
CC
2.0
V
AC CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
CONDITIONS
R = 3k, C = 51pF
MIN
TYP
8
5
MAX
30
UNITS
V/µs
V/µs
Slew Rate
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
0.3
0.8
0.8
µs
µs
HLR
LHR
The
●
denotes specifications which apply over the operating temperature
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
range of 0°C ≤ T ≤ 70°C.
A
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
Note 3: Measurements made in the Shutdown mode are performed
with V
= 0V.
ON/OFF
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Receiver Input Thresholds
vs Temperature
Driver Output Voltage
vs Temperature
Supply Current vs Data Rate
2.2
2.0
1.8
1.6
10
8
45
40
35
30
25
20
15
10
5
R
= 3k
V
= 5V
OUTPUT HIGH
= 5V
L
CC
R
= 3k
V
L
L
CC
C
= 2500pF
6
2 DRIVERS ACTIVE
V
TH
V
= 4.5V
CC
4
2
0
V
TL
–2
–4
–6
1.4
1.2
1.0
OUTPUT LOW
= 4.5V
V
CC
V
= 5V
CC
–8
0
40
TEMPERATURE (˚C)
60
70
0
10
20
30
50
0
10
20
30
70
0
25
50
75
150 175
40
50
60
100 125
TEMPERATURE (°C)
DATA RATE (kBAUD)
LTC1384 • TPC02
LTC1384 • TPC01
LTC1384 • TPC03
3
LTC1384
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
VCC Supply Current
vs Temperature
Driver Short-Circuit Current
vs Temperature
Receiver Short-Circuit Current
vs Temperature
18
16
14
12
10
8
18
16
14
12
10
8
50
40
30
20
10
–
I
SC
+
–
I
I
SC
SC
2 DRIVERS LOADED
= 3k
R
L
1 DRIVER LOADED
6
6
R
L
= 3k
4
4
+
I
SC
2
2
0
0
0
10
20
30
60
70
0
10
20
30
60
70
0
10
20
30
60
70
40
50
40
50
40
50
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1384 • TPC04
LTC1384 • TPC05
LTC1384 • TPC06
Driver Leakage in Shutdown
vs Temperature
Driver Output Waveforms
Receiver Output Waveforms
45
40
35
30
25
20
15
10
5
DRIVER
OUTPUT
L = 3k
R
RECEIVER
OUTPUT
CL = 2500pF
C
L = 51pF
DRIVER
OUTPUT
R
L = 3k
V
= –20V
= 20V
OUT
INPUT
INPUT
V
LTC1384 • TPC08
LTC1384 • TPC09
OUT
0
30
0
10
20
40
50
60
70
TEMPERATURE (°C)
LTC1384 • TPC07
4
LTC1384
U
U
U
PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled C1+,C1–,C2+,C2–:CommutatingCapacitorInputs.These
with a 0.1µF ceramic capacitor.
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 2Ω.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the Shutdown mode independent of
the EN pin. The supply current of the device drops to 35µA
(two receivers alive) and both driver outputs are forced
into three-state.
TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS
compatible. The inputs of unused drivers can be left
unconnected since 300k input pull-up resistors to VCC are
included on chip. To minimize power consumption, the
internaldriverpull-upresistorsaredisconnectedfromVCC
in the Shutdown mode.
EN: TTL/CMOS Compatible Receiver Enable Pin. A logic
high forces the receiver outputs into three-state. A logic
low enables the receiver outputs.
V+: Positive Supply Output (RS232 Drivers). V+ 2VCC
2V. This pin requires an external capacitor C = 0.1µF for
charge storage. The capacitor may be tied to ground or
VCC. With multiple devices, the V + and V– pins may share
a common capacitor. For large numbers of devices, in-
creasing the size of the shared common storage capaci-
tors is recommended to reduce ripple.
V–:NegativeSupplyOutput(RS232Drivers).V – –(2VCC
– 2V). This pin requires an external capacitor C = 0.1µF for
charge storage.
TR OUT: Driver Outputs at RS232 Voltage Levels. Outputs
areinahighimpedancestatewhenintheShutdownorVCC
= 0V. The driver outputs are protected against ESD to
±10kV for human body model discharges.
–
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.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. A logic high at EN puts the outputs into three-state.
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
t
t
LHR
LHD
HLR
HLD
LTC1384 • F02
LTC1384 • F01
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
5
LTC1384
TEST CIRCUITS
Receiver Timing Test Load
Driver Timing Test Load
DRIVER
OUTPUT
RX
OUTPUT
DRIVER
INPUT
RX INPUT
DRIVER
RX
51pF
51pF
3k
LTC1384 • TA04
LTC1384 • TA03
ESD Test Circuit
2
4
5
6
17
3
V
CC
0.1µF
0.1µF
LTC1384
0.1µF
7
0.1µF
V
V
CC
300k
300k
12
15
LOGIC INPUT
232 OUTPUT
CC
11
13
8
RS232
LOGIC INPUT
232 OUTPUT
232 INPUT
LINE PINS
PROTECTED
TO ±10kV
14
LOGIC OUTPUT
5k
10
18
9
LOGIC OUTPUT
ON/OFF
232 INPUT
5k
16
LTC1384 • TA04
6
LTC1384
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
G Package
20-Lead SSOP
0.278 – 0.289*
(7.07 – 7.33)
20 19 18 17 16 15 14 13 12 11
0.301 – 0.311
(7.65 – 7.90)
0.045
(1.14)
5
7
8
1
2
3
4
6
9 10
0.045
(1.14)
0.205 – 0.212*
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
0° – 8°
0.0256
(0.65)
BSC
0.005 – 0.009
(0.13 – 0.22)
0.022 – 0.037
(0.55 – 0.95)
0.002 – 0.008
(0.05 – 0.21)
0.010 – 0.015
(0.25 – 0.38)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
20SSOP 0294
N Package
18-Lead Plastic DIP
0.905
(22.860)
MAX
18
17
16
15
14
13
12
11
10
0.260 ± 0.010
(6.604 ± 0.254)
1
2
3
5
6
9
4
7
8
0.300 – 0.325
0.130 ± 0.005
0.045 – 0.065
(7.620 – 8.255)
(3.302 ± 0.127)
(1.143 – 1.651)
0.015
(0.381)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.025
–0.015
0.325
0.125
(3.175)
MIN
0.045 ± 0.015
(1.143 ± 0.381)
0.018 ± 0.003
(0.457 ± 0.076)
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
N18 0392
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
LTC1384
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
S Package
18-Lead Plastic SOL
0.447 – 0.463
(11.354 – 11.760)
(NOTE 2)
14 13
11
15
12
10
18 17 16
0.394 – 0.419
(10.007 – 10.643)
SEE NOTE
2
3
5
7
8
9
1
4
6
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
(2.362 – 2.642)
0.005
(0.127)
RAD MIN
0.010 – 0.029
× 45°
(0.254 – 0.737)
0° – 8° TYP
0.050
(1.270)
TYP
0.004 – 0.012
(0.102 – 0.305)
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.014 – 0.019
0.016 – 0.050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
SOL18 0392
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).
LT/GP 0594 10K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LINEAR TECHNOLOGY CORPORATION 1994
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