MIC2557
Micrel
MIC2557
PCMCIA Card Socket V
PP
Switching Matrix
General Description
The MIC2557 switches the four voltages required by PCMCIA
(Personal Computer Memory Card International Association)
card V
PP
Pins. The MIC2557 provides selectable 0V, 3.3V,
5.0V, or 12.0V (鹵5%) from the system power supply to V
PP1
or V
PP2
. Output voltage is selected by two digital inputs.
Output current ranges up to 120mA. Four control states, V
PP
,
V
CC
, high impedance, and active logic low are available. An
auxiliary control input determines whether the high imped-
ance (open) state or low logic state is asserted.
In either quiescent mode or full operation, the device draws
very little current, typically less than 1碌A(chǔ).
The MIC2557 is available in an 8-pin SOIC and an 8-pin
plastic DIP.
Features
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Complete PCMCIA V Switch Matrix in a Single IC
PP
No External Components Required
Digital Selection of 0V, V
CC
, V
PP
, or High Imped鈥?/div>
ance Output
No V
PP 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
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PCMCIA V
PP
Ordering Information
Part Number
MIC2557BM
MIC2557BM T&R
Temperature Range
鈥?0擄C to +85擄C
鈥?0擄C to +85擄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
0.1碌F
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
0.1碌F
1碌F
1碌F
2
7
MIC2557
3
6
4
5
Simplified Block Diagram
VDD
VPP IN
VCC
EN1
0
0
0
1
1
EN0 Hi-Z/Low V
PP OUT
0
0
1
0
1
0
1
x
x
x
0V, (Sink current)
Hi-Z (No Connect)
V
CC
(3.3V or 5.0V)
V
PP
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 V
PP
Switching Matrix, see the MIC2558.
For a V
PP
and V
CC
Switching Matrix, see the MIC2560.
2-4
1997
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