參數(shù)資料
型號： MIC2558
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： 61K
代理商： MIC2558
MIC2558
Applications Information
Micrel
2-14
1997
PCMCIA V
PP1
and V
PP2
control is easily accomplished
using the MIC2558 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 MIC2558 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. MIC2558 Typical two slot PCMCIA applica-
tion with single 5.0V V
CC
.
System
Power
Supply
PCMCIA
Card Slot
Controller
MIC2558
PCMCIA
Card Slot
A
PCMCIA
Card Slot
B
MIC2558
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 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 a MIC2558 and a con-
troller. 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 MIC2558.
During Flash memory programming, the PCMCIA controller
outputs a (1,0) to one or both halves of the MIC2558, which
connects V
PP IN
to V
PP OUT1
and/or V
PP OUT2
. The low ON
resistance of the MIC2558 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
PCMCIA
Card Slot
A
PCMCIA
Card Slot
B
VCC Select and
Switch
MIC2558
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. MIC2558 Typical two slot PCMCIA applica-
tion with dual V
CC
(5.0V or 3.3V).
相關PDF資料
PDF描述
MIC2559 Replaced by PT6502 :
MIC2559BM Replaced by PT6502 :
MIC2559BMTR PCMCIA Dual Card Socket VPP Switching Matrix
MIC2561 PCMCIA Card Socket VCC & VPP Switching Matrix
MIC2561-0BM PCMCIA Card Socket VCC & VPP Switching Matrix
相關代理商/技術參數(shù)
參數(shù)描述
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 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 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5
MIC2560-0BWM TR 功能描述:電源開關 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 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5
MIC2560-0YWM 功能描述:電源開關 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 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5
MIC2560-0YWM TR 功能描述:電源開關 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 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5
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