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參數(shù)資料
| 型號： | LTC1484C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low-Power LinCMOS(TM) Quad Comparator 20-LCCC -55 to 125 |
| 中文描述： | 485低功耗收發(fā)器與接收器故障保險 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 274K |
| 代理商： | LTC1484C |
14
LTC1484
longer delay for the falling edge is due to the larger voltage
range the line must swing (typically >2V compared to
370mV) before the receiver trips high again. The differ-
ence in delay affects the duty cycle of the received data and
depends on cable capacitance. For a 1-foot STP cable, the
delays drop to 0.13
μ
s and 0.4
μ
s. Using smaller valued
pull-up and pull-down resistors to equalize the positive
and negative voltage swings needed to trip the receivers
will reduce the difference in delay and increase the maxi-
mum data rate. With 220
resistors, both rising and
falling edge delays are 2.2
μ
s when driving a 1000-foot STP
cable as shown in Figure 12b.
The fail-safe feature of the LTC1484 receiver allows a
CDMA system to function without the A and B pull-up and
pull-down resistors. However, if the resistors are left out,
noise margin will be reduced to as low as 15mV and
propagation delays will increase significantly. Operation in
this mode is not recommended.
Since DE and RE are tied together, the part never shuts
down. The receiver inputs are never floating (due to the
external bias resistors) so that the t
DZR
timing does not
apply to this application. The whole system can be changed
to actively transmit only a “1” by swapping the pull-up and
pull-down resistors in Figure 11, shorting DI to V
CC
and
connecting the 1k resistor as a pull-down. In this configu-
ration the driver is noninverting and the receiver output RO
truly follows DE.
APPLICATIO
S I
N
FOR
ATIO
U
W
U
PACKAGE DESCRIPTIO
N
U
Dimensions in inches (millimeters), unless otherwise noted.
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
MSOP (MS8) 1098
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
0.021
±
0.006
(0.53
±
0.015)
0
°
– 6
°
TYP
SEATING
PLANE
0.007
(0.18)
0.040
±
0.006
(1.02
±
0.15)
0.012
(0.30)
REF
0.006
±
0.004
(0.15
±
0.102)
0.034
±
0.004
(0.86
±
0.102)
0.0256
(0.65)
BSC
1
2
3
4
0.193
±
0.006
(4.90
±
0.15)
8
7
6
5
0.118
±
0.004*
(3.00
±
0.102)
0.118
±
0.004**
(3.00
±
0.102)
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相關代理商/技術參數(shù) |
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| LTC1484CMS8 | 功能描述:IC TXRX RS485 LOWPWR 8-MSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| LTC1484CMS8#PBF | 功能描述:IC TXRX RS485 LOWPWR 8-MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓模塊:RS-232 & USB Transceiver 標準包裝:2,000 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
| LTC1484CMS8#TR | 功能描述:IC TXRX RS485 LP FAILSAFE 8MSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| LTC1484CMS8#TRPBF | 功能描述:IC TXRX RS485 LOWPWR 8-MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| LTC1484CN8 | 功能描述:IC TXRX RS485 LOWPWR 8-DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
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