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參數(shù)資料
| 型號： | MIC2559BMTR |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | PCMCIA Dual Card Socket VPP Switching Matrix |
| 中文描述： | 雙卡插槽的PCMCIA交流在線切換矩陣 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大小： | 74K |
| 代理商： | MIC2559BMTR |
MIC2559
Applications Information
Micrel
2-20
April 1998
PCMCIA V
PP1
and V
PP2
control is easily accomplished
using the MIC2559 voltage selector/switch IC. Two control
bits per V
PP OUT
pin determine output voltage and standby/
operate mode condition. Output voltages of 0V (defined as
less than 0.4V), V
CC
(3.3V or 5V), V
PP
, or a high impedance
state, are available. When either the high impedance or low
voltage conditions are selected, the device switches into
"sleep" mode and draws only nanoamperes of leakage
current.
The MIC2559 is a dual low-resistance power MOSFET
switching matrix that operates from the computer system
main power supply. Device power is obtained from V
DD
,
which may be either 3.3V or 5V, and FET drive is obtained
from V
PP IN
(usually +12V). Internal break-before-make
switches determine the output voltage and device mode.
V
PP1
and V
PP2
are completely indepenent from each other.
Supply Bypassing
For best results, bypass V
CC
and V
PP IN
inputs with 1
μ
F
capacitors. Both V
PP OUT
pins should have a 0.01
μ
F to
0.1
μ
F capacitor for noise reduction and electrostatic dis-
charge (ESD) damage prevention. Larger values of output
capacitor will create large current spikes during transitions,
requiring larger bypass capacitors on the V
CC
and V
PP IN
pins.
Figure 3. MIC2559 Typical two slot PCMCIA applica-
tion with single 5.0V V
CC
.
System
Power
Supply
PCMCIA
Card Slot
Controller
MIC2558
MIC2559
PCMCIA
Card Slot
A
PCMCIA
Card Slot
B
MIC2559
5V
12V
EN01
EN11
EN12
EN02
EN11
EN01
EN12
EN02
VPP1
VPP2
VCC
VPP1
VPP2
VCC
VCC Switch
VPP IN
VCC
VPP IN
VCC
PCMCIA Implementation
The Personal Computer Memory Card International Asso-
ciation (PCMCIA) specification, version 2.0 (September,
1991), requires two V
PP
supply pins per PCMCIA slot. V
PP
is primarily used for programming Flash (EEPROM) memory
cards. The two V
PP
supply pins may be programmed to
different voltages. Fully implementing PCMCIA specifica-
tions requires a MIC2559 and a controller. Figure 2 shows
this full configuration, supporting both 5.0V and 3.3V V
CC
operation. Figure 3 is a simplified design with fixed V
CC
= 5V.
When a memory card is initially inserted, it should receive
V
CC
— usually 5.0V
±
5%. The card sends a handshaking
data stream to the controller, which then determines whether
or not this card requires V
PP
and if the card is designed for
5.0V or 3.3V V
CC
. If the card uses 3.3V V
CC
, the controller
commands this change, which is reflected on the V
CC
pins of
both the PCMCIA slot and the MIC2559.
During Flash memory programming, the PCMCIA controller
outputs a (1,0) to one or both halves of the MIC2559, which
connects V
PP IN
to V
PP OUT1
and/or V
PP OUT2
. The low ON
resistance of the MIC2559 switch requires only a small
bypass capacitor on the V
PP OUT
pins, with the main filtering
System
Power
Supply
PCMCIA
Card Slot
Controller
VCC Select and
Switch
MIC2558
MIC2559
PCMCIA
Card Slot
A
PCMCIA
Card Slot
B
VCC Select and
Switch
MIC2559
5V
3.3V
12V
EN01
EN11
EN12
EN02
EN11
EN01
EN12
EN02
VPP1
VPP2
VCC
VPP1
VPP2
VCC
VPP IN
VCC
VPP IN
VCC
Figure 2. MIC2559 Typical two slot PCMCIA applica-
tion with dual V
CC
(5.0V or 3.3V).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2561 | PCMCIA Card Socket VCC & VPP Switching Matrix |
| MIC2561-0BM | PCMCIA Card Socket VCC & VPP Switching Matrix |
| MIC2561-1BM | PCMCIA Card Socket VCC & VPP Switching Matrix |
| MIC2562A | PCMCIA/CardBus Socket Power Controller |
| MIC2562A-1BM | PCMCIA/CardBus Socket Power Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2560-0BWM | 功能描述:電源開關(guān) IC - 配電 PCMCIA Card Sw. Matrix RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MIC2560-0BWM TR | 功能描述:電源開關(guān) IC - 配電 PCMCIA Card Sw. Matrix RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MIC2560-0YWM | 功能描述:電源開關(guān) IC - 配電 PCMCIA Card Sw. Matrix - Lead Free RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MIC2560-0YWM TR | 功能描述:電源開關(guān) IC - 配電 PCMCIA Card Sw. Matrix - Lead Free RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MIC25601BWM | 制造商:MICREL 功能描述:* 制造商:Micrel Inc 功能描述: |
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