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參數(shù)資料
| 型號： | MC145407 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 5 Volt Only Driver/ Receiver(5V 驅(qū)動器/接收器) |
| 中文描述： | 5伏，只有驅(qū)動器/接收器（5V的驅(qū)動器/接收器） |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 175K |
| 代理商： | MC145407 |
MC145407
6
MOTOROLA
APPLICATIONS INFORMATION
ESD CONSIDERATIONS
ESD protection on IC devices that have their pins acces-
sible to the outside world is essential. High static voltages
applied to the pins when someone touches them either di-
rectly or indirectly can cause damage to gate oxides and
transistor junctions by coupling a portion of the energy from
the I/O pin to the power supply busses of the IC. This cou-
pling will usually occur through the internal ESD protection
diodes. The key to protecting the IC is to shunt as much of
the energy to ground as possible before it enters the IC. Fig-
ure 7 shows a technique which will clamp the ESD voltage at
approximately + 15 V using the MMBZ15VDLT1. Any resid-
ual voltage which appears on the supply pins is shunted to
ground through the 0.1
μ
F capacitors.
OPERATION WITH SMALLER VALUE CHARGE PUMP
CAPS
The MC145407 is characterized in the electrical tables
using 10
μ
F charge pump caps to illustrate its capability in
driving a companion MC145406 or MC145403. If there is no
requirement to support a second interface device and/or the
charge pump is not being used to power any other com-
ponents, the MC145407 is capable of complying with
EIA–232–E and V.28 with smaller value charge pump caps.
Table 1 summarizes driver performance with both 2.2
μ
F and
1.0
μ
F charge pump caps.
Table 1. Typical Performance
Parameter
2.2
μ
F
1.0
μ
F
Tx VOH @ 25
°
C
Tx VOH @ 85
°
C
Tx VOL @ 25
°
C
Tx VOL @ 85
°
C
Tx Slew Rate @ 25
°
C
7.3
7.2
7.2
7.1
– 6.5
– 6.4
– 6.1
– 6.0
8.0 V/
μ
s
8.0 V/
μ
s
Tx Slew Rate @ 85
°
C
7.0 V/
μ
s
7.0 V/
μ
s
14
600
16
TIP
13
BYPASS
DTMF
INPUT
RDSI
20 k
CDSI
RTLA
+ 5 V
20
6
9
8
3
11
5
TLA
DSI
TxA
RxA2
1
17
15
VDD
Xin
Xout
CD
TxD
RxD
SQT
LB
MODE
CDA
VSS
12
CDT
VAG
FB
ExI
RxA1
RTx
18
10
19
4
600:600
CFB
+
10 k
RING
VDD
VDD
BYPASS
VSS
CCDT
7
2
10 k
10 k
10 k
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
10
μ
F
1.0
μ
F
3.579
MHz
CCDA
3
1
15
16
13
17
19
6
5
8
7
9
8
2
3
7
2
4
VSS
GND
DI3
DI2
DO1
DI1
C2 +
C2 –VDD
VCC C1 –
C1 +
Tx1
Rx1
Tx2
Rx2
Rx3
* Line protection circuit
MC145442
OR
MC145443
MC145407
1.0
μ
F
1.0
μ
F
1.0
μ
F
+
EIA–232–E
DB–25
CONNECTOR
0.1
μ
F
0.1
μ
F
0.1
μ
F
*
Figure 4. 5 V, 300 Baud Modem with EIA–232–E Interface
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC145407DW | UltraLow-Supply Current/Supply-Voltage Supervisory Circuits 6-SOT-23 -40 to 85 |
| MC145407P | UltraLow-Supply Current/Supply-Voltage Supervisory Circuits 6-SOT-23 -40 to 85 |
| MC14541BD | Programmable Timer |
| MC14541BCP | Programmable Timer |
| MC14541BD | Programmable Timer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC145407DW | 制造商:Motorola Inc 功能描述: 制造商:Motorola Inc 功能描述:Line Transceiver, 3-Driver, 3-Receiver, 20 Pin, Plastic, SOP |
| MC145407DWR2 | 制造商:Motorola Inc 功能描述:Line Transceiver, 3-Driver, 3-Receiver, 20 Pin, Plastic, SOP |
| MC145408DWR2 | 制造商:Freescale Semiconductor 功能描述:CMOS DRIVER/RECEIVER, 5 X 5 |
| MC145412P | 制造商:Motorola Inc 功能描述: |
| MC14541BCP | 功能描述:計時器和支持產(chǎn)品 LOG CMOS OSILATR TIMER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
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