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參數(shù)資料
| 型號： | MC33298DW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | OCTAL SERIAL SWITCH (SPI Input/Output) |
| 中文描述： | 1 A 8 CHANNEL, BUF OR INV BASED PRPHL DRVR, PDSO24 |
| 封裝： | PLASTIC, SOP-24 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 280K |
| 代理商： | MC33298DW |
MC33298
19
MOTOROLA ANALOG IC DEVICE DATA
Latch–Up Immunity
Device latch–up caused by substrate injection has been
characterized. Latch–up immunity has both a dc and a
transient immunity component. DC latch–up immunity results
indicate the device to be capable of withstanding in excess of
four amps of reverse current out of any of the output
transistors while the control logic continues to function
normally. The logic control current (IDD) was found to
increase by only 0.6 mA with four amps of current being
pulled out of an output. Additionally, the IPWR current was
found to increase by only 0.15 mA under the same condition.
These increases are a result of minority carriers being
injected into substrate and subsequently being collected.
The following procedure has been developed to test for
transient latch–up immunity and has been applied to this
automotive circuit design. Results of transient testing indicate
the device to operate properly at output currents greater than
1.5 A. The procedure tests for the device’s immunity to
intermittent load to battery current connection with the device
controlling an inductive load. Appropriately termed “the file
test,” the battery is connected to a shop file while the lead to
the inductive load is dragged across the files surface causing
intermittent load opens producing lots of arcs, sparks, and
smoke, plus severe transients (see Figure 24). It is during
these severe transients that latch–up most likely could occur.
The battery voltage used for this test was 18 V and the
inductive load was 2.0 mH. These values were found to
produce severe transient stresses of the device outputs. All
outputs must maintain operation and input control during
transient generation to pass “the file test.”
The device’s input control currents were found to remain
stable and were not affected by dc or transient latch–up
immunity testing.
Figure 24. Transient Latch–Up Immunity File Test
Battery
0.1
μ
F
Ilimit
Output 0
RS
Open
Load
Detect
Short
Circuit
Detect
Over
Temperature
Detect
SO
SI
SCLK
CSB
Reset
SFPD
VDD
Gate
Control
65 V
Outputs
1 – 7
Grounds
VPWR
APPLICATIONS INFORMATION
SIOP Communication
Two common communication protocols used in Motorola’s
microprocessors are the Serial Peripheral Interface (SPI) and
Synchronous Input Output Port (SIOP). SIOP is a subset of
the more flexible SPI and the simpler of the two protocols.
SIOP is used on many of the MC68HC05 family of
microcontrollers. Restrictions of the SIOP protocol include:
1) the SCLK frequency is fixed at one–fourth the internal
clock rate and 2) the polarity of the SCLK signal is fixed.
By way of example, the MC68HC05P9 utilizes SIOP
protocol and is not directly compatible with the serial input
requirements of the MC33298. Specifically, the MC33298
accepts data on the falling edge of SCLK whereas its rising
edge triggers data transfer in the SIOP protocol. SCLK is high
during SIOP transmissions, which is the opposite of what the
MC33298 requires.
Though designed specifically for SPI communication
protocol, the MC33298 can easily be adapted to
communicate with SIOP protocol through the use of
software. The amount of code required to implement SPI in
software is relatively small, so the only major drawback is a
slower transfer of data. The software routine shown in
Table 1 completes a transfer in about 100
μ
s.
Cost
The bottom line relates to cost. The MC33298 is a very
cost effective octal output serial switch for applications
typically encountered in the automotive and industrial market
segments. To accomplish only the most basic serial switch
function the MC33298 offers, using a discrete semiconductor
approach, would require the use of at least eight logic level
power MOSFETs for the outputs and two shift registers for
the I/O plus other miscellaneous “glue” components.
Additional circuitry would have to be incorporated to
accomplish the protection features offered by the MC33298.
Other noteworthy advantages the MC33298 offers are
conservation of power and board space, requirement of
fewer application components, and enhanced application
reliability. The MC33298 is available at a fraction of the cost
required for discrete component implementation and
represents true value.
The MC33298 represents a cost effective device having
advanced performance and features and worthy of
consideration.
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| MC33298DWR2 | 功能描述:IC OCTAL SERIAL SWITCH 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動器 - 內(nèi)部開關(guān) 系列:- 標(biāo)準包裝:1,000 系列:- 類型:高端/低端驅(qū)動器 輸入類型:SPI 輸出數(shù):8 導(dǎo)通狀態(tài)電阻:850 毫歐，1.6 歐姆 電流 - 輸出 / 通道:205mA，410mA 電流 - 峰值輸出:500mA，1A 電源電壓:9 V ~ 16 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:PG-DSO-20-45 包裝:帶卷 (TR) |
| MC33298P | 功能描述:IC SWITCH SERIAL OCTAL 20-DIP RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動器 - 內(nèi)部開關(guān) 系列:- 標(biāo)準包裝:1,000 系列:- 類型:高端/低端驅(qū)動器 輸入類型:SPI 輸出數(shù):8 導(dǎo)通狀態(tài)電阻:850 毫歐，1.6 歐姆 電流 - 輸出 / 通道:205mA，410mA 電流 - 峰值輸出:500mA，1A 電源電壓:9 V ~ 16 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:PG-DSO-20-45 包裝:帶卷 (TR) |
| MC33304P | 制造商:ON Semiconductor 功能描述: |
| MC3330P | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC33340D | 功能描述:電池管理 18V Max NiCD/NiMH RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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