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參數(shù)資料
| 型號： | LT1237 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Advanced Low Power Three Driver, Five Receiver RS232 Transceiver.(先進的低功率3發(fā)4收RS232收發(fā)器) |
| 中文描述： | 先進的低功耗三驅(qū)動器，接收器的RS232收發(fā)器五。（先進的低功率3發(fā)4收的RS232收發(fā)器） |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 178K |
| 代理商： | LT1237 |
7
LT1237
U
S
A
O
PPLICATI
IU
U
Storage Capacitor Selection
The V
+
and V
–
storage capacitors must be chosen care-
fully to insure low ripple and stable operation. The LT1237
charge pump operates in a power efficient Burst Mode
TM
operation. When storage capacitor voltage drops below a
preset threshold, the oscillator is gated on until V
+
and V
–
are boosted up to levels exceeding a second threshold.
The oscillator then turns off, and current is supplied from
the V
+
and V
–
storage capacitors.
The V
–
potential is monitored to control charge pump
operation. It is therefore important to insure lower V
+
ripple than V
–
ripple, or erratic operation of the charge
pump will result. Proper operation is insured in most
applications by choosing the V
+
filter capacitor to be at
least 5 times the V
–
filter capacitor value. If V
+
is more
heavily loaded than V
–
, a larger ratio may be needed.
The V
–
filter capacitor should be selected to obtain low
ripple when the drivers are loaded, forcing the charge
pump into continuous mode. A minimum value 0.1
μ
F is
suggested.
Do not attempt to reduce V
–
ripple when the charge pump
is in discontinuous Burst Mode operation. The ripple in
this mode is determined by internal comparator thresh-
olds. Larger storage capacitor values increase the burst
period, and do not reduce ripple amplitude.
Power Saving Operational Modes
The LT1237 has both shutdown and driver disable operat-
ing modes. These operating modes can optimize power
consumption based upon applications needs.
The On/Off shutdown control turns off all circuitry except
for Low-Q RX5. When RX5 detects a signal, this informa-
tion can be used to wake up the system for full operation.
If more than one line must be monitored, the driver disable
mode provides a power efficient operating option. The
driver disable mode turns off the charge pump and RS232
drivers, but keeps all five receivers active. Power con-
sumption in driver disable mode is 3mA from V
CC
.
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Burst Mode is a trademark of Linear Technology Corporation
PACKAGE DESCRIPTIOU
Dimensions in inches (millimeters) unless otherwise noted.
G Package
28-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
G28 SSOP 0694
0.301 – 0.311
(7.65 – 7.90)
1 2 3 4 5 6 7 8 9 101112
14
13
0.397 – 0.407*
(10.07 – 10.33)
25
26
2221201918171615
23
24
27
28
(1.73 – 1.99)
(0.05 – 0.21)
(0.65)
BSC
(0.25 – 0.38)
(0.13 – 0.22)
0
°
– 8
°
(0.55 – 0.95)
(5.20 – 5.38)
DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
*
**
N28 1197
0.505 – 0.560*
(12.827 – 14.224)
1.455*
(36.957)
MAX
1
2
3
4
5
6
7
8
9
10
27
19
20
21
22
24
23
25
26
28
11
12
13
14
15
16
17
18
0.070
(TYP
0.015
(MIN
0.125
(3.175)
MIN
0.150
±
0.005
(3.810
±
0.127)
0.018
±
0.003
(0.457
±
0.076)
0.035 – 0.080
(0.889 – 2.032)
0.100
±
0.010
(2.540
±
0.254)
0.045 – 0.065
(1.143 – 1.651)
0.009 – 0.015
(0.229 – 0.381)
0.625–0.015
+0.889
15.87
(
)
0.600 – 0.625
(15.240 – 15.875)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
NW Package
28-Lead PDIP (Wide 0.600)
(LTC DWG # 05-08-1520)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1237C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:5V RS232 Transceiver with Advanced Power Management and One Receiver Active in Shutdown |
| LT1237CG | 功能描述:IC TXRX 5V RS232 ADV LOPWR28SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:線路收發(fā)器 驅(qū)動器/接收器數(shù):5/3 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:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:Digi-Reel® 產(chǎn)品目錄頁面:918 (CN2011-ZH PDF) 其它名稱:296-25096-6 |
| LT1237CG#PBF | 功能描述:IC TXRX 5V RS232 ADV LOPWR28SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:線路收發(fā)器 驅(qū)動器/接收器數(shù):5/3 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:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:Digi-Reel® 產(chǎn)品目錄頁面:918 (CN2011-ZH PDF) 其它名稱:296-25096-6 |
| LT1237CG#TR | 功能描述:IC TXRX 5V RS232 ADV LOPWR28SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:27 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
| LT1237CG#TRPBF | 功能描述:IC TXRX 5V RS232 ADV LOPWR28SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:27 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
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