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| 型号： | MIC2568-0YSM |
| 厂商： | Micrel Inc |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC PCMCIA/CARDBUS DUAL 28-SSOP |
| 标准包装： | 47 |
| 类型： | PCMCIA/Cardbus 开关 |
| 输出数： | 4 |
| Rds（开）： | 4 欧姆 |
| 内部开关： | 是 |
| 电流限制： | 300mA |
| 输入电压： | 3.3V，5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
| 产品目录页面： | 1111 (CN2011-ZH PDF) |
| 其它名称： | 576-2189 MIC2568-0YSM-ND |
MIC2568
Applications Information
PC Card power control for two sockets is easily accomplished
using the Micrel MIC2568 PC Card/CardBus Slot Power
Controller IC.
Output Voltage Selection
Four control bits per socket determine V CC and V PP output
voltages and standby- or operate-mode conditions. Input
logic threshold voltages are compatible with common PC
Card logic controllers using either 3.3V or 5V supplies.
The V CC outputs can be individually switched between 0V
(ground) or 3.3V and 5V at the maximum allowable PC Card
current. The V PP outputs can be individually switched be-
tween 0V (ground), 3.3V or 5V (V CC3 or V CC5 voltages), or
high impedance. When V CC = 0V (ground) is selected, the
MIC2568 goes into sleep mode and draws only nanoamperes
of leakage current.
Switching speeds are controlled to prevent damage to sensi-
tive loads and meet all PC Card Specification timing require-
ments. V CC switches are turned on and off slowly. If com-
manded to switch directly from one V CC to the other (without
first turning off and waiting 100ms), enhancement of the
second switch begins only after the first is off (break-before-
make protection).
Supply Input
The MIC2568 itself is powered from the V CC3 IN pin (3.3V-
nominal supply input). Bias its internal MOSFETs is gener-
ated by a charge pump quadrupler. Refer to “ 5V-Only V CC
Application ” and Figure 4 for information on using the MIC2568
without a 3.3V supply.
Output Current and Protection
The MIC2568 meets or exceeds all PCMCIA current specifi-
cations. Its switches are capable of passing the maximum
current needed by any PC Card. For system and card
Micrel
protection, output currents are internally limited. For full
system protection, long-term output short circuits (millisec-
ond or longer) invoke overtemperature shutdown, protecting
the MIC2568, system power supplies, card socket pins, and
PC Card.
Bypass Capacitors
Both V CC3 IN and V CC5 IN pins should be bypassed with 1 μ F
low-ESR surface-mount ceramic capacitors mounted near
the MIC2568 chip.
Both V CC OUT and V PP OUT pins may use 0.01 μ F to 0.1 μ F
capacitors for noise reduction and to reduce the chance of
(electrostatic discharge) ESD damage.
PC Card Slot Implementation
The MIC2568 is designed for PC Card applications, including
the CardBus option, that do not require a 12V supply.
When a memory card is initially inserted, it must receive a V CC
voltage (either 3.3V ± 0.3V or 5.0V ± 5%). The initial voltage is
determined by a combination of mechanical socket keys and
voltage-sense pins. Each card sends handshaking data to
the logic controller which determines whether that card
requires a V PP voltage and whether the card is designed for
dual V CC voltages. If the card is compatible with, and re-
quests, a different V CC level, the controller disables V CC ,
waits at least 100ms, and then enables the new V CC voltage.
If no card is inserted, or the system is in sleep mode, the logic
controller outputs a (V CC3 EN, V CC5 EN) = (0, 0) to the
MIC2568, which shuts down V CC . This also places the switch
into its high-impedance output sleep mode.
Basic V PP and V CC Switch Application
Refer to Figure 3. A single system power supply feeds both
slot-A and slot-B supply inputs. Although the PC Card speci-
fication defines two V PP outputs (V PP 1 and V PP 2) per card,
they are usually connected together.
System Power Supply
( OPTIONAL )
Address and data lines
between logic controller and
PCMCIA cards not shown.
3.3V
5V
Slot A
V PP 1
A ? B V CC3
IN
A ? B V CC5
IN
V PP 2
PC Card
A EN1
A EN0
A V PP OUT
A V CC OUT
V CC
V CC
A
Dual-Slot
PC Card
Logic Controller
A V CC5 EN
A V CC3 EN
B EN1
B EN0
MIC2568-0
Power
Controller
B V PP OUT
Slot B
V PP 1
B V CC5 EN
B V CC3 EN
GND
B V CC OUT
V PP 2
V CC
PC Card
B
V CC
Motherboard
Figure 3. Basic V PP and V CC Switch
MIC2568
8
May 2003
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2568-0YSM TR | 功能描述:电源开关 IC - 配电 Dual Slot PCMCIA/CardBus Socket Power Controller - For Low Voltages - Lead Free RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MIC2568-1BSM | 功能描述:电源开关 IC - 配电 Dual Slot PCMCIA/CardBus Socket Power Controller - For Low Voltages RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MIC2568-1BSM TR | 功能描述:电源开关 IC - 配电 Dual Slot PCMCIA/CardBus Socket Power Controller - For Low Voltages RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MIC2568-1BSMTR | 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| MIC2568-1BTS | 功能描述:IC PCMCIA/CARDBUS DUAL 28-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电源分配开关 系列:- 特色产品:XRP252 Switches 标准包装:1 系列:- 类型:高端开关 输出数:2 Rds（开）:140 毫欧 内部开关:是 电流限制:1.15A 输入电压:1.75 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN（3x3） 包装:Digi-Reel® 其它名称:1016-1691-6 |
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