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參數(shù)資料
| 型號(hào)： | MIC2558BM |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | PCMCIA Dual Card Socket VPP Switching Matrix |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 56K |
| 代理商： | MIC2558BM |
1997
5
MIC2558
Micrel
Applications Information
PCMCIA VPP1 and VPP2 control is easily accomplished
using the MIC2558 voltage selector/switch IC. Two control
bits per VPP OUT pin determine output voltage and standby/
operate mode condition. Output voltages of 0V (defined as
less than 0.4V), VCC (3.3V or 5V), VPP, 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 VDD,
which may be either 3.3V or 5V, and FET drive is obtained
from VPP IN (usually +12V). Internal break-before-make
switches determine the output voltage and device mode.
VPP1 and VPP2 are completely indepenent from each other.
Supply Bypassing
For best results, bypass VCC and VPP IN inputs with 1F
capacitors. Both VPP OUT pins should have a 0.01F to
0.1
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 VCC and VPP 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 VPP supply pins
per PCMCIA slot. VPP is primarily used for programming
Flash (EEPROM) memory cards. The two VPP 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 VCC operation. Figure 3 is a simplified design
with fixed VCC = 5V.
When a memory card is initially inserted, it should receive
VCC — usually 5.0V ±5%. The card sends a handshaking
data stream to the controller, which then determines whether
or not this card requires VPP and if the card is designed for
5.0V or 3.3V VCC. If the card uses 3.3V VCC, the controller
commands this change, which is reflected on the VCC 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 VPP IN to VPP OUT1 and/or VPP OUT2. The low ON
resistance of the MIC2558 switch requires only a small
bypass capacitor on the VPP 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).
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