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參數(shù)資料
| 型號： | TPS2206DB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL-SLOT PC CARD POWER-INTERFACE SWITCH WITH RESET FOR SERIAL PCMCIA CONTROLLER |
| 中文描述： | 雙插槽PC卡電源，串行接口，PCMCIA控制器復位開關 |
| 文件頁數(shù)： | 19/28頁 |
| 文件大?。?/td> | 458K |
| 代理商： | TPS2206DB |
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TPS2206
DUAL-SLOT PC CARD POWER-INTERFACE SWITCH
WITH RESET FOR SERIAL PCMCIA CONTROLLER
SLVS138B – MAY 1996 – REVISED JUNE 1998
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output ground switches
Several PCMCIA power-distribution switches on the market do not have an active-grounding FET switch. These
devices do not meet the PC Card specification requiring a discharge of V
CC
within 100 ms. PC Card resistance
can not be relied on to provide a discharge path for voltages stored on PC Card capacitance because of possible
high-impedance isolation by power-management schemes. A method commonly shown to alleviate this
problem is to add to the switch output an external 100-k
resistor in parallel with the PC Card. Considering that
this is the only discharge path to ground, a timing analysis shows that the RC time constant delays the required
discharge time to more than 2 seconds. The only way to ensure timing compatibility with PC Card standards
is to use a power-distribution switch that has an internal ground switch, like that of the TPS22xx family, or add
an external ground FET to each of the output lines with the control logic necessary to select it.
In summary, the TPS2206 is a complete single-chip dual-slot PC Card power interface. It meets all currently
defined PCMCIA specifications for power delivery in 5-V, 3.3-V, and mixed systems, and offers a serial control
interface. The TPS2206 offers functionality, power savings, overcurrent and thermal protection, and fault
reporting in one 30-pin SSOP surface-mount package for maximum value added to new portable designs.
power supply considerations
The TPS2206 has multiple pins for each of its 3.3-V, 5-V, and 12-V power inputs and for the switched V
CC
outputs. Any individual pin can conduct the rated input or output current. Unless all pins are connected in
parallel, the series resistance is significantly higher than that specified, resulting in increased voltage drops and
lost power. Both 12-V inputs must be connected for proper V
pp
switching; it is recommended that all input and
output power pins be paralleled for optimum operation.
Although the TPS2206 is fairly immune to power input fluctuations and noise, it is generally considered good
design practice to bypass power supplies typically with a 1-
μ
F electrolytic or tantalum capacitor paralleled by
a 0.047-
μ
F to 0.1-
μ
F ceramic capacitor. It is strongly recommended that the switched V
CC
and V
pp
outputs be
bypassed with a 0.1-
μ
F or larger capacitor; doing so improves the immunity of the TPS2206 to electrostatic
discharge (ESD). Care should be taken to minimize the inductance of PCB traces between the TPS2206 and
the load. High switching currents can produce large negative-voltage transients, which forward biases substrate
diodes, resulting in unpredictable performance. Similary, no pin should be taken below –0.3 V.
RESET or RESET inputs
To ensure that cards are in a known state after power brownouts or system initialization, the PC Cards should
be reset at the same time as the host by applying a low impedance to the V
CC
and V
pp
terminals. A
low-impedance output state allows discharging of residual voltage remaining on PC Card filter capacitance,
permitting the system (host and PC Cards) to be powered up concurrently. The RESET or RESET input closes
internal switches S1, S4, S7, and S10 with all other switches left open (see TPS2206 control-logic table). The
TPS2206 remains in the low-impedance output state until the signal is deasserted and further data is clocked
in and latched. RESET or RESET is provided for direct compatibility with systems that use either an active-low
or active-high reset voltage supervisor. The unused pin is internally pulled up or down and should be left
unconnected.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2206IDAP | 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2206IDAPG4 | 功能描述:熱插拔功率分布 1A Dual-Slot PC Card Pwr Sw RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2206IDAPR | 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2206IDAPRG4 | 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2206IDB | 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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