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MIC2557

Micrel Semiconductor
Part Number MIC2557
Manufacturer Micrel Semiconductor
Description PCMCIA Card Socket VPP Switching Matrix
Published Mar 26, 2005
Detailed Description MIC2557 Micrel MIC2557 PCMCIA Card Socket VPP Switching Matrix General Description The MIC2557 switches the four volt...
Datasheet PDF File MIC2557 PDF File

MIC2557
MIC2557

Overview
MIC2557 Micrel MIC2557 PCMCIA Card Socket VPP Switching Matrix General Description The MIC2557 switches the four voltages required by PCMCIA (Personal Computer Memory Card International Association) card VPP Pins.
The MIC2557 provides selectable 0V, 3.
3V, 5.
0V, or 12.
0V (± 5%) from the system power supply to VPP1 or VPP2.
Output voltage is selected by two digital inputs.
Output current ranges up to 120mA.
Four control states, VPP, VCC, high impedance, and active logic low are available.
An auxiliary control input determines whether the high impedance (open) state or low logic state is asserted.
In either quiescent mode or full operation, the device draws very little current, typically less than 1µA.
The MIC2557 is available in an 8-pin SOIC and an 8-pin plastic DIP.
Features • • • • • • • • • • Complete PCMCIA V Switch Matrix in a Single IC PP No External Components Required Digital Selection of 0V, VCC, VPP, or High Imped– ance Output No VPP OUT Overshoot or Switching Transients Break-Before-Make Switching Low Power Consumption 120mA V (12V) Output Current PP Optional Active Source Clamp for Zero Volt Condition 3.
3V or 5V Supply Operation 8-Pin SOIC Package Applications • • • PCMCIA V PP Ordering Information Part Number MIC2557BM MIC2557BM T&R Temperature Range –40°C to +85°C –40°C to +85°C Package 8-pin SOIC 8-SOIC Tape & Reel* Pin Voltage Switch Power Supply Management Power Analog Switch * 2,500 Parts per reel.
Typical Application VCC +3.
3V or +5V VPP IN +12V VDD +5V Pin Configuration VPP IN VPP OUT +VCC 0.
1µF 8 8 2 7 MIC2557 3 6 4 5 VDD Hi-Z/Low EN0 EN1 GND Hi-Z/ Low Control EN0 EN1 VPP(n) OUT 0.
1µF 1µF 1µF 2 7 MIC2557 3 6 4 5 Simplified Block Diagram VDD VPP IN VCC EN1 0 0 0 1 1 EN0 Hi-Z/Low VPP OUT 0 0 1 0 1 0 1 x x x 0V, (Sink current) Hi-Z (No Connect) VCC (3.
3V or 5.
0V) VPP Hi-Z (No Connect) Hi-Z/Low EN0 EN1 Decoder, Driver & Bias Control High Impedance or Pull Down Select VPP OUT For a dual PCMCIA Card Socket VPP Switching Matrix, see...


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