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參數(shù)資料
| 型號： | LT1332CG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Wide Supply Range Low Power RS232 Transceiver with 12V VPP Output for Flash Memory |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 264K |
| 代理商： | LT1332CG |
6
LT1332
PI FUU
capacitors work well in this application. When V
–
is
powered from an external supply, the filter capacitor can
be considerably smaller (C
≥
0.1
μ
F). Ceramic capacitors
work well under these conditions. V
–
should be greater
than –13.2V and less than –6.5V.
C
–
:
Commutating Capacitor Input. When the LT1332 is
used with a switching regulator, a charge pump capacitor
should be connected from the regulator’s switch pin to the
C
–
pin. Make the external capacitor 1
μ
F or larger with low
effective series resistance to maintain good charge pump
efficiency. Low ESR tantalum capacitors (ESR < 2
) work
well in this application. The C
–
pin should be left open
when V
–
is powered from an external supply.
DRIVER IN:
RS232 Driver Input Pins. Inputs are TTL/
CMOS compatible, with threshold set to 1.2V. Unused
inputs should not float; tie them to V
CC
.
DRIVER OUT:
Driver Outputs at RS232 Voltage Levels.
Outputs are in a high impedance state when in SHUT-
DOWN mode, or V
CC
= 0V. Outputs are fully short-circuit
protected from V
–
+ 30V to V
+
– 30V with the power on,
off or SHUTDOWN. Typical breakdowns are
±
45V.
Applying higher voltages will not damage the device if
the overdrive is moderately current limited. Although
the outputs are protected, short circuits on one output
U
can load the power supply generator and may disrupt
the signal levels of the other outputs. The driver outputs
are protected against ESD to
±
10kV for human body
model discharges.
RX IN:
Receiver Inputs. These pins accept RS232 level
signals (
±
5V to
±
30V) into a protected 5k terminating
resistor. The receiver inputs are protected against ESD to
±
10kV for human body model discharges. Each receiver
provides 0.4V of hysteresis for noise immunity. The re-
ceiver thresholds are specified at V
CC
= 3V. When V
CC
varies from 2V to 6V, the lower threshold increases
about 3V. Regardless of these shifts, the device provides
accurate data from valid RS232 input signals. A graph in
the performance characteristics section shows typical
changes in the thresholds. The active receiver (RXA, Pin
10, S Package) remains functional in SHUTDOWN.
RX OUT:
Receiver Outputs with TTL/CMOS Voltage Lev-
els. Outputs are in a high impedance stage when in
SHUTDOWN mode to allow data line sharing. Outputs are
fully short-circuit protected to ground or V
CC
with the
power on, off or in SHUTDOWN mode. The active receiver
(RXA, Pin 15, S Package) remains functional in SHUT-
DOWN.
ESD PROTECTIOU
The RS232 line inputs of the LT1332 have on-chip protec-
tion from ESD transients up to
±
10kV. The protection
structures act to divert the static discharge safely to
system ground. In order for the ESD protection to function
effectively, the power supply and ground pins of the
LT1332 must be connected to ground through low imped-
ances. The power supply decoupling capacitors and charge
pump storage capacitors provide this low impedance in
normal applications of the circuit. The only constraint is
that low ESR capacitors must be used for bypassing and
charge storage. ESD testing must be done with pins V
CC
,
V
+
, V
–
and GND shorted to ground or connected with low
ESR capacitors.
ESD Test Circuit
LT1332 TC
LT1332
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
–12V
0.1
μ
F
0.1
μ
F
3V
RS232
LINE PINS
PROTECTED
TO ±10kV
C
–
DRIVER OUT
RX IN
DRIVER OUT
RX IN
RX IN
RX IN
DRIVER OUT
RXA IN
NC
V
–
GND
GND
DRIVER IN
RX OUT
DRIVER IN
RX OUT
RX OUT
RX OUT
DRIVER IN
RXA OUT
RS232 ON/OFF
V
+
3V V
CC
0.1
μ
F
12V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1332CG#PBF | 功能描述:IC TXRX RS232 W/12V VPP 28-SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| LT1332CG#TR | 功能描述:IC TXRX RS232 LP 12V VPP 28SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝: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 |
| LT1332CG#TRPBF | 功能描述:IC TXRX RS232 W/12V VPP 28-SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| LT1332CN | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Wide Supply Range Low Power RS232 Transceiver with 12V VPP Output for Flash Memory |
| LT1332CNW | 功能描述:IC TXRX RS232 W/12V VPP 28-DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝: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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