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參數(shù)資料
| 型號(hào)： | MIC2557 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | PCMCIA Card Socket VPP Switching Matrix |
| 中文描述： | PCMCIA卡插槽在線交流開關(guān)矩陣 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大小： | 51K |
| 代理商： | MIC2557 |
MIC2557
Applications Information
Micrel
2-8
1997
PCMCIA V
PP
control is easily accomplished using the
MIC2557 voltage selector/switch IC. Two control bits deter-
mine 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 MIC2557 is a 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 deter-
mine the output voltage and device mode.
Supply Bypassing
For best results, bypass V
CC
and V
PP IN
at their inputs with
1
μ
F capacitors. V
PP OUT
should have a 0.01
μ
F to 0.1
μ
F
capacitor for noise reduction and electrostatic discharge
(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 2. MIC2557 Typical two slot PCMCIA applica-
tion with dual V
CC
(5.0V or 3.3V).
Figure 3. MIC2557 Typical two slot PCMCIA applica-
tion with single 5.0V V
CC
.
PCMCIA Implementation
The Personal Computer Memory Card International Asso-
ciation (PCMCIA) specification 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 implement-
ing PCMCIA specifications requires two MIC2557, 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. Palmtop computers, where size
and battery life are tantamount, can sometimes use a com-
promise implementation, with V
PP1
tied to V
PP2
(see Figure
4).
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 MIC2557.
During Flash memory programming, the PCMCIA controller
outputs a (1,0) to the MIC2557, which connects V
PP IN
to
System
Power
Supply
PCMCIA
Card Slot
Controller
MIC2557
MIC2557
PCMCIA
Card Slot
A
PCMCIA
Card Slot
B
MIC2557
MIC2557
5V
12V
EN0
EN1
EN1
EN0
EN1
EN0
EN1
EN0
VPP1
VPP2
VCC
VPP1
VPP2
VCC
VCC Switch
VPP IN
VCC
VPP IN
VCC
VPP IN
VCC
VPP IN
VCC
System
Power
Supply
PCMCIA
Card Slot
Controller
VCC Select and
Switch
MIC2557
MIC2557
PCMCIA
Card Slot
A
PCMCIA
Card Slot
B
VCC Select and
Switch
MIC2557
MIC2557
5V
3.3V
12V
EN0
EN1
EN1
EN0
EN1
EN0
EN1
EN0
VPP1
VPP2
VCC
VPP1
VPP2
VCC
VPP IN
VCC
VPP IN
VCC
VPP IN
VCC
VPP IN
VCC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2557BM | Replaced by PT6501 : |
| MIC2557BMT&R | PCMCIA Card Socket VPP Switching Matrix |
| MIC2558 | PCMCIA Dual Card Socket VPP Switching Matrix |
| MIC2559 | Replaced by PT6502 : |
| MIC2559BM | Replaced by PT6502 : |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2557BM | 制造商:Micrel Inc 功能描述: 制造商:Micron Technology Inc 功能描述: 制造商:Micrel Inc 功能描述:IC PCMCIA SOCKET SWITCHING MATRIX, SOIC8, IC Interface Type:-, Interface Applica |
| MIC2558BM | 制造商:Micrel Inc 功能描述:PCMCIA Card Socket 14-Pin SOIC 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 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(shí)間（最大值）:400 us 關(guān)閉時(shí)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(shí)間（最大值）:400 us 關(guān)閉時(shí)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(shí)間（最大值）:400 us 關(guān)閉時(shí)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 |
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