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參數(shù)資料
| 型號(hào)： | LT1330I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal D-Type Transparent Latches With 3-State Outputs 20-PDIP 0 to 70 |
| 中文描述： | 5V的RS232收發(fā)器3V邏輯接口和一個(gè)接收器在關(guān)機(jī)活動(dòng) |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 248K |
| 代理商： | LT1330I |
7
LT1330
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 LT1330
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 LT1330 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
.
Burst Mode is a trademark of Linear Technology Corporation
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.
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIOU
G Package
28-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
NOTE:LEAD DIMENSIONS APPLY TO SOLDER DIP
OR TIN PLATE LEADS
0.015 – 0.075
(0.381 – 1.904)
0.125
(3.175)
MIN
0.005
(0.127)
MIN
0.100
±
0.010
(2.540
±
0.254)
0.225
(5.715)
MAX
0.014 – 0.026
(0.360 – 0.660)
0.045 – 0.068
(1.143 – 1.727)
J28 1197
11
3
7
20
16
15
5
6
10
9
17
14
13
12
1
4
2
19
8
18
0.510 – 0.620
(12.95 – 15.75)
MAX
1.490
(37.85)
MAX
21
22
23
28
24
25
26
27
0.025
(0.635)
0.008 – 0.018
(0.203 – 0.457)
0.600 TYP
(15.240 TYP)
0.685–0.060
+0.635
–1.524
17.40
(
)
0
°
– 15
°
JW Package
28-Lead CERDIP (Wide 0.600, Hermetic)
(LTC DWG # 05-08-1120)
G28 SSOP 0694
(7.65 – 7.90)
1 2 3 4 5 6 7 8 9 101112
14
13
0.397 – 0.407*
22
23
24
25
26
27
28
(1.73 – 1.99)
(0.05 – 0.21)
(0.65)
BSC
(0.25 – 0.38)
(0.13 – 0.22)
0
°
– 8
°
0.022 – 0.037
(0.55 – 0.95)
(5.20 – 5.38)
DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
*
**
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| LT1331CG | 功能描述:IC TXRX 5V/3V RS232 28-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)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(dòng)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 |
| LT1331CG#PBF | 功能描述:IC TXRX 5V/3V RS232 28-SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)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(dòng)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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