电子工程世界电子工程世界电子工程世界

关键词

搜索

型号

搜索
 

LTC1387CSW#PBF

器件型号:LTC1387CSW#PBF
器件类别:模拟混合信号IC    驱动程序和接口   
文件大小:184KB,共12页
厂商名称:ADI(亚德诺半导体)
厂商官网:https://www.analog.com
标准:
下载文档

器件描述

Single Transmitter/Receiver RS-232/RS-485 20-Pin SOIC W Tube

参数
参数名称属性值
Brand NameAnalog Devices Inc
是否无铅含铅
是否Rohs认证符合
厂商名称ADI(亚德诺半导体)
包装说明SOP,
针数20
制造商包装代码05-08-1620 (SW20)
Reach Compliance Codecompliant
Is SamacsysN
差分输出YES
驱动器位数1
输入特性DIFFERENTIAL SCHMITT TRIGGER
接口集成电路类型LINE TRANSCEIVER
接口标准EIA-232; EIA-422; EIA-485; EIA-562
JESD-30 代码R-PDSO-G20
JESD-609代码e3
长度12.8 mm
湿度敏感等级1
功能数量1
端子数量20
最高工作温度70 °C
最低工作温度
封装主体材料PLASTIC/EPOXY
封装代码SOP
封装形状RECTANGULAR
封装形式SMALL OUTLINE
峰值回流温度(摄氏度)260
认证状态Not Qualified
最大接收延迟6000 ns
接收器位数1
座面最大高度2.65 mm
最大供电电压5.25 V
最小供电电压4.75 V
标称供电电压5 V
表面贴装YES
技术CMOS
温度等级COMMERCIAL
端子面层MATTE TIN
端子形式GULL WING
端子节距1.27 mm
端子位置DUAL
处于峰值回流温度下的最长时间30
最大传输延迟4000 ns
宽度7.5 mm
Base Number Matches1

文档预览

LTC1387
Single 5V RS232/RS485
Multiprotocol Transceiver
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Two RS232 Transceivers or One RS485 Transceiver
Operates from a Single 5V Supply
Guaranteed Receiver Output with Inputs
Floating or Shorted to Ground
Logic Selectable Fast/Slow RS485 Driver Slew Rate
Low Supply Current: 7mA Typical
5µA Supply Current in Shutdown
Self-Testing Capability in Loopback Mode
Separate Driver and Receiver Enable Controls
Driver Maintains High Impedance in Three-State,
Shutdown or with Power Off
Receiver Inputs Can Withstand
±25V
The LTC
®
1387 is a low power reconfigurable CMOS bidi-
rectional transceiver. It can be configured as an RS485
differential port or as two RS232 single-ended ports. An
onboard charge pump uses four 0.1µF capacitors to
generate boosted positive and negative supplies, allowing
the RS232 drivers to meet
±5V
output swing require-
ments with only a single 5V supply. A shutdown mode
reduces the I
CC
supply current to 5µA.
The RS232 transceivers are in full compliance with RS232
specification. The RS485 transceiver is in full compliance
with RS485 and RS422 specifications. The RS485 re-
ceiver assumes a known output state when the inputs are
floating or shorted to ground. All interface drivers feature
short-circuit and thermal shutdown protection. An enable
pin allows RS485 driver outputs to be forced into high
impedance which is maintained even when the outputs are
forced beyond supply rails or the power is off. A loop back
mode allows the driver outputs to be connected back to the
receiver inputs for diagnostic self-test.
The LTC1387 is available in 20-pin plastic SSOP and SW
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIONS
s
s
s
s
s
Point-of-Sale Terminals
Software Selectable Multiprotocol Interface Ports
Low Power RS485/RS422/RS232/EIA562 Interface
Cable Repeaters
Level Translators
TYPICAL APPLICATI
2
3
1 20
LTC1387
19
V
CC1
5V
18
RECOUT
17
4
5
120Ω
6
7
8
13
10
RS485 INTERFACE
120Ω
4
5
6
7
8
13
10
DR IN
SLEW
DR ENABLE
5V
15
14
9
12
11
4000-FT 24-GAUGE TWISTED PAIR
5V
5V
5V
5V
ALL CAPACITORS: 0.1µF MONOLITHIC CERAMIC TYPE
LTC1387 • TA01
U
19
20 1
LTC1387
2
3
18
V
CC2
5V
17
RECOUT
15
14
9
12
11
DR IN
SLEW
DR ENABLE
5V
UO
U
1
LTC1387
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
C1
+
1
C1
2
V
DD
3
A 4
B 5
Y 6
Z 7
485/232 8
DXEN 9
GND 10
G PACKAGE
20-LEAD PLASTIC SSOP
20 C2
+
19 C2
18 V
CC
17 R
A
16 R
B
15 D
Y
14 D
Z
/SLEW
13 ON
12 RXEN
11 V
EE
SW PACKAGE
20-LEAD PLASTIC SO
Supply Voltage (V
CC
) ............................................. 6.5V
Input Voltage
Drivers ................................... – 0.3V to (V
CC
+ 0.3V)
Receivers ............................................. – 25V to 25V
485/232, ON, DXEN
RXEN, SLEW ........................... – 0.3V to (V
CC
+ 0.3V)
Output Voltage
Drivers ................................................. – 18V to 18V
Receivers ............................... – 0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration
Output ........................................................ Indefinite
V
DD
, V
EE
, C1
+
, C1
, C2
+
, C2
.......................... 30 sec
Operating Temperature Range
LTC1387C .............................................. 0°C to 70°C
LTC1387I ........................................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
ORDER PART
NUMBER
LTC1387CG
LTC1387CSW
LTC1387IG
LTC1387ISW
T
JMAX
= 125°C,
θ
JA
= 120°C/W (G)
T
JMAX
= 125°C,
θ
JA
= 75°C/W (SW)
Consult factory for Military grade parts.
DC ELECTRICAL CHARACTERISTICS
SYMBOL
V
OD1
V
OD2
∆V
OD
V
OC
∆V
OC
I
OSD
I
OZD
V
O
I
OSD
V
IH
V
IL
I
IN
PARAMETER
Differential Driver Output Voltage (Unloaded)
Differential Driver Output Voltage (With Load)
Change in Magnitude of Driver Differential
Output Voltage for Complementary Output States
Driver Common Mode Output Voltage
Change in Magnitude of Driver Common Mode
Output Voltage for Complementary Output States
Driver Short-Circuit Current
Three-State Output Current (Y, Z)
Output Voltage Swing
Output Short-Circuit Current
Input High Voltage
Input Low Voltage
Input Current
RS485 Driver (485/232 = High, ON = DXEN = High)
I
O
= 0
T
A
= 25°C, V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3), unless otherwise noted.
CONDITIONS
q
q
q
q
q
q
q
q
MIN
TYP
MAX
6
UNITS
V
V
V
V
V
V
mA
mA
µA
V
V
Figure 1, R = 50Ω (RS422)
Figure 1, R = 27Ω (RS485)
Figure 1, R = 27Ω or R = 50Ω
Figure 1, R = 27Ω or R = 50Ω
Figure 1, R = 27Ω or R = 50Ω
V
O
= – 7V, 12V; V
O
= High
V
O
= – 7V, 12V; V
O
= Low (Note 4)
– 7V
V
O
12V
Figure 4, R
L
= 3k, Positive
Figure 4, R
L
= 3k, Negative
V
O
= 0V
D
Y
, D
Z
, DXEN, RXEN, ON, 485/232, SLEW
D
Y
, D
Z
, DXEN, RXEN, ON, 485/232, SLEW
D
Y
, D
Z
, DXEN, RXEN, ON, 485/232
SLEW (Note 5)
2.0
1.5
6
6
0.2
3
0.2
35
10
±5
250
250
500
RS232 Driver (485/232 = Low, ON = DXEN = High)
q
q
q
5
–5
6.5
– 6.5
±17
±60
Driver Inputs and Control Inputs
q
q
q
q
2
0.8
±0.1
5
±10
15
2
U
mA
V
V
µA
µA
W
U
U
W W
W
LTC1387
DC ELECTRICAL CHARACTERISTICS
SYMBOL
V
TH
∆V
TH
I
IN
R
IN
V
TH
∆V
TH
R
IN
V
OH
V
OL
I
OSR
I
OZR
V
DD
V
EE
PARAMETER
Differential Input Threshold Voltage
Input Hysteresis
Input Current (A, B)
Input Resistance
Receiver Input Voltage Threshold
Receiver Input Hysteresis
Receiver Input Resistance
Receiver Output High Voltage
Receiver Output Low Voltage
Short-Circuit Current
Three-State Output Current
V
DD
Output Voltage
V
EE
Output Voltage
RS485 Receiver (485/232 = High, ON = RXEN = High)
T
A
= 25°C, V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3), unless otherwise noted.
CONDITIONS
– 7V
V
CM
12V
V
CM
= 0V
V
IN
= 12V
V
IN
= – 7V
– 7V
V
IN
12V
Input Low Threshold
Input High Threshold
V
IN
=
±10V
I
O
= – 3mA, V
IN
= 0V, 485/232 = Low
I
O
= 3mA, V
IN
= 3V, 485/232 = Low
0V
V
O
V
CC
RXEN = 0V
No Load, ON = DXEN = RXEN = High
I
DD
= – 5mA, ON = DXEN = RXEN = High
No Load, ON = DXEN = RXEN = High
I
EE
= 5mA, ON = DXEN = RXEN = High
No Load, ON = DXEN = RXEN = High
Shutdown, ON = DXEN = RXEN = 0V
q
q
q
q
q
q
q
q
q
q
MIN
– 0.20
TYP
MAX
0.20
UNITS
V
mV
mA
mA
kΩ
V
V
V
kΩ
V
40
1
– 0.8
12
0.8
2.4
0.6
3
3.5
7
±0.1
8
7
– 7.7
– 7.0
7
5
25
100
5
4.6
0.2
0.4
85
±10
7
24
RS232 Receiver (485/232 = Low, ON = RXEN = High)
q
q
Receiver Output (ON = RXEN = High)
V
mA
µA
V
V
V
V
mA
µA
Power Supply Generator
Power Supply
I
CC
V
CC
Supply Current
AC ELECTRICAL CHARACTERISTICS
SYMBOL
SR
t
T
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
SKEW
t
r
, t
f
PARAMETER
Slew Rate
Transition Time
Driver Input to Output
Driver Input to Output
Receiver Input to Output
Receiver Input to Output
Driver Input to Output
Driver Input to Output
Driver Output to Output
Driver Rise or Fall Time
RS232 Mode (ON = DXEN = RXEN = High, 485/232 = Low)
T
A
= 25°C, V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3), unless otherwise noted.
CONDITIONS
Figure 4, R
L
= 3k, C
L
= 15pF
Figure 4, R
L
= 3k, C
L
= 1000pF
Figure 4, R
L
= 3k, C
L
= 2500pF
Figures 4, 10, R
L
= 3k, C
L
= 15pF
Figures 4, 10, R
L
= 3k, C
L
= 15pF
Figures 5, 11
Figures 5, 11
Figures 2, 7, R
L
= 54Ω, C
L
= 100pF
Figures 2, 7, R
L
= 54Ω, C
L
= 100pF
Figures 2, 7, R
L
= 54Ω, C
L
= 100pF
Figures 2, 7, R
L
= 54Ω, C
L
= 100pF
q
q
q
q
q
q
q
MIN
TYP
MAX
30
UNITS
V/µs
V/µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
4
0.22
1.9
0.6
0.6
0.3
0.4
15
15
3
40
40
5
15
3.1
4
4
6
6
70
70
15
40
RS485 Mode (Fast Slew Rate, ON = DXEN = High, 485/232 = High, SLEW = High)
q
q
q
q
3
LTC1387
AC ELECTRICAL CHARACTERISTICS
SYMBOL
t
ZL
t
ZH
t
LZ
t
HZ
t
PLH
t
PHL
t
SKEW
t
r
, t
f
t
ZL
t
ZH
t
LZ
t
HZ
t
PLH
t
PHL
t
SKEW
t
ZL
t
ZH
t
LZ
t
HZ
PARAMETER
Driver Enable to Output Low
Driver Enable to Output High
Driver Disable from Low
Driver Disable from High
Driver Input to Output
Driver Input to Output
Driver Output to Output
Driver Rise or Fall Time
Driver Enable to Output Low
Driver Enable to Output High
Driver Disable from Low
Driver Disable from High
Receiver Input to Output
Receiver Input to Output
Differential Receiver Skew,
t
PLH
– t
PHL
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Low
Receiver Disable from High
T
A
= 25°C, V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3), unless otherwise noted.
CONDITIONS
Figures 3, 8, C
L
= 100pF, S1 Closed
Figures 3, 8, C
L
= 100pF, S2 Closed
Figures 3, 8, C
L
= 15pF, S1 Closed
Figures 3, 8, C
L
= 15pF, S2 Closed
Figures 2, 7, R
L
= 54Ω, C
L
= 100pF
Figures 2, 7, R
L
= 54Ω, C
L
= 100pF
Figures 2, 7, R
L
= 54Ω, C
L
= 100pF
Figures 2, 7, R
L
= 54Ω, C
L
= 100pF
Figures 3, 8, C
L
= 100pF, S1 Closed
Figures 3, 8, C
L
= 100pF, S2 Closed
Figures 3, 8, C
L
= 15pF, S1 Closed
Figures 3, 8, C
L
= 15pF, S2 Closed
Figures 2, 9, R
L
= 54Ω, C
L
= 100pF
Figures 2, 9, R
L
= 54Ω, C
L
= 100pF
Figures 2, 9, R
L
= 54Ω, C
L
= 100pF
Figures 6, 12, C
L
= 15pF, S1 Closed
Figures 6, 12, C
L
= 15pF, S2 Closed
Figures 6, 12, C
L
= 15pF, S1 Closed
Figures 6, 12, C
L
= 15pF, S2 Closed
q
q
q
q
q
q
q
q
MIN
TYP
50
50
50
60
MAX
90
90
90
90
1500
1500
750
1500
1500
1500
200
200
140
140
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
RS485 Mode (Fast Slew Rate, ON = DXEN = High, 485/232 = High, SLEW = High)
RS485 Mode (Slow Slew Rate, ON = DXEN = High, 485/232 = High, SLEW = Low)
q
q
q
q
q
q
q
q
100
100
150
700
700
200
300
600
600
100
100
RS485 Mode (ON = RXEN = High, 485/232 = High)
q
q
20
20
70
70
10
40
40
40
40
Receiver Output Enable/Disable (ON = High)
90
90
90
90
ns
ns
ns
ns
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3:
All typicals are given at V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF
and T
A
= 25°C.
Note 4:
Short-circuit current for RS485 driver output low state folds back
above V
CC
. Peak current occurs around V
O
= 3V.
Note 5:
SLEW includes an internal pull-up in RS485 mode.
PIN FUNCTIONS
C1
+
(Pin 1):
Commutating Capacitor C1 Positive Terminal.
Requires an external 0.1µF capacitor between Pins 1 and 2.
C1
(Pin 2):
Commutating Capacitor C1 Negative Terminal.
V
DD
(Pin 3):
Charge Pump Positive Supply Output.
Requires an external 0.1µF capacitor to ground.
A (Pin 4):
Receiver Input A. Inverting input of RS232
receiver A in RS232 mode; inverting RS485 receiver input
in RS485 mode.
B (Pin 5):
Receiver Input B. Inverting input of RS232
receiver B in RS232 mode; noninverting RS485 receiver
input in RS485 mode.
Y (Pin 6):
Driver Output Y. Inverting RS232 driver Y output
in RS232 mode; inverting RS485 driver output in RS485
mode.
Z (Pin 7):
Driver Output Z. Inverting RS232 driver Z output
in RS232 mode; noninverting RS485 driver output in
RS485 mode.
4
U
U
U
LTC1387
PI FU CTIO S
485/232 (Pin 8):
Interface Mode Select Input. A low logic
input enables two RS232 drivers and two RS232 receiv-
ers. A high input enables the RS485 driver and the RS485
receiver.
DXEN (Pin 9):
Driver Enable Input. A high logic input
enables the drivers and a low logic input disables the
drivers. When disabled, all driver outputs are in high
impedance
GND (Pin 10):
Ground.
V
EE
(Pin 11):
Charge Pump Negative Supply Output.
Requires an external 0.1µF capacitor to ground.
RXEN (Pin 12):
Receiver Enable Input. A high logic input
enables the receivers and a low logic input disables the
receivers. When disabled, all receiver outputs are in high
impedance.
ON (Pin 13):
A high logic level at ON input keeps the charge
pump active regardless of the state of the DXEN and RXEN
inputs. When the charge pump is active, the drivers and
receivers can be enabled or disabled without waiting for
charge pump stabilization time (typically 100µs with 0.1µF
capacitors). A low logic state at the ON, DXEN and RXEN
inputs will put the transceiver and charge pump in shut-
down mode and reduces I
CC
to 5µA. Whenever the trans-
ceiver is activated from shutdown, the charge pump
should be allowed to stabilize before data transmission.
When DXEN and RXEN are high and ON is low, the charge
pump, drivers and receivers are all active and the driver
outputs are internally looped back to the inputs of the
receiver. The three control inputs ON, DXEN and RXEN can
be configured for one-, two- or three-wire control: one-
wire mode – all three inputs connected together; two-wire
mode – inputs ON and RXEN connected to one wire, DXEN
a separate wire; three-wire mode – separate wires to each
input. See the Function Tables.
D
Z
/SLEW (Pin 14):
Driver Z or Slew Input. In RS232
mode, this pin is the driver Z input. In RS485 mode, this
pin controls the slew rate of the RS485 driver. With the
SLEW pin high, the RS485 driver runs at maximum (fast)
slew rate and can transmit signals up to 5MBd. With the
SLEW pin low, the RS485 driver runs with reduced (slow)
slew rate to control reflections with improperly terminated
cables. In slow mode, the RS485 driver can support data
rates up to 150kBd. This SLEW pin has internal 5µA pull-
up during RS485 mode.
D
Y
(Pin 15):
Driver Y Input. Input Y in RS232 mode; the
differential driver input in RS485 mode.
R
B
(Pin 16):
Receiver B Output. Output B in RS232 mode;
output is high impedance in RS485 mode.
R
A
(Pin 17):
Receiver A Output. Output A in RS232 mode;
the differential receiver output in RS485 mode.
V
CC
(Pin 18):
Positive Supply. 4.75V
V
CC
5.25V.
Requires an external 0.1µF bypass capacitor to ground.
C2
(Pin 19):
Commutating Capacitor C2 Negative Termi-
nal. Requires an external 0.1µF capacitor between Pins 19
and 20.
C2
+
(Pin 20):
Commutating Capacitor C2 Positive
Terminal.
U
U
U
5

参考设计

采用 LTC1387 的 5V RS232/RS485 多协议收发器参考设计
说明 5V RS232/RS485 Multiprotocol Transceiver Reference Design Using LTC1387 ...

[ 查看详情 ]

采用 LTC1387 的 5V RS232/RS485 多协议收发器参考设计
说明 5V RS232/RS485 Multiprotocol Transceiver Reference Design Using LTC1387 ...

[ 查看详情 ]

采用 LTC1387 的 5V RS232/RS485 多协议收发器参考设计
说明 5V RS232/RS485 Multiprotocol Transceiver Reference Design for Full-Duple...

[ 查看详情 ]

采用 LTC1387 的 5V RS232/RS485 多协议收发器参考设计
说明 5V RS232/RS485 Multiprotocol Transceiver Reference Design Using LTC1387 ...

[ 查看详情 ]

采用 LTC1387 的 5V RS232/RS485 多协议收发器参考设计
说明 5V RS232/RS485 Multiprotocol Transceiver Reference Design Using LTC1387 ...

[ 查看详情 ]

LTC1387:5V RS232/RS485 多协议收发器参考设计
说明 LTC1387: 5V RS232/RS485 Multiprotocol Transceiver Reference Design using...

[ 查看详情 ]

LTC1387:5V RS232/RS485 多协议收发器参考设计
说明 LTC1387: 5V RS232/RS485 Multiprotocol Transceiver Reference Design using...

[ 查看详情 ]

LTC1387 单路 5V RS232/RS485 多协议收发器的典型应用
说明 Typical Application for LTC1387 Single 5V RS232/RS485 Multiprotocol Tran...

[ 查看详情 ]

为什么 51单片机的稳定性,某tmel要好于某TC ,不都是51的内核吗
为什么 51单片机的稳定性,某tmel要好于某TC ,不都是51的内核吗...
深圳小花 PCB设计
如何避免编程中遇到的各种坑
今天发现程序不能正常运行,自己查了好几遍,没看出问题,找同事帮忙看了一下,发现是一很简单的错误,代码如下感觉用C语言编程还是经验少呀,大家用C语言编写单片机程序的时候经常会犯哪些错误,或者C语言编程中会遇到哪些坑,有没有相关的资料,请大家帮忙提供一下。...
深圳小花 单片机
请问 二极管 的耗尽层 是指什么被耗尽了?
请问 二极管 的耗尽层是指什么被耗尽了?...
深圳小花 单片机
春暖花开,我为TI C2000 LaunchPad“画”外围!
暖暖初春,别让你手中的TI C2000 LaunchPad长虫啦!为了挖掘出TI C2000 LaunchPad 更多更好玩的应用,咱们一起来为它做外围电路吧!DIY不仅可以获得支持,还有很多惊喜好礼哦!...
soso 活动列表
请帮忙看一下,所测的电容的实际 对应的 标称值
请帮忙看一下,所测的电容的实际 对应的 标称值以下全是用万用表检测的值,肯定不准确,请帮忙给一下 标准值。c10=114.8nFC4=115nfC2=10.2ufc3=4.44ufc8=120nfc1=112nfc6=50pfc12=955pfc13=9.4nfc17=114nfc16=123nfc14=2.3nfc18=2.2nf...
深圳小花 PCB设计

About Us 关于我们 客户服务 联系方式 器件索引 网站地图 最新更新 手机版

站点相关: 大学堂 TI培训 Datasheet 电子工程

器件索引   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

北京市海淀区中关村大街18号B座15层1530室 电话:(010)82350740 邮编:100190

电子工程世界版权所有 京B2-20211791 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号 Copyright © 2005-2023 EEWORLD.com.cn, Inc. All rights reserved