MICREL MIC2557BM Datasheet
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 V
or V
. Output voltage is selected by two digital inputs.
PP2
PP1
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.
Applications
• PCMCIA VPP Pin Voltage Switch
• Power Supply Management
• Power Analog Switch
Features
• Complete PCMCIA VPP Switch Matrix in a Single IC
• No External Components Required
• Digital Selection of 0V, VCC, VPP, or High Imped–
ance Output
• No V
PP OUT
Overshoot or Switching Transients
• Break-Before-Make Switching
• Low Power Consumption
• 120mA VPP (12V) Output Current
• Optional Active Source Clamp for Zero Volt Condition
• 3.3V or 5V Supply Operation
• 8-Pin SOIC Package
Ordering Information
Part Number Temperature Range Package
MIC2557BM –40°C to +85°C 8-pin SOIC
MIC2557BM T&R –40°C to +85°C 8-SOIC Tape & Reel*
* 2,500 Parts per reel.
Typical Application
V
CC
+3.3V or +5V
V
PP(n) OUT
0.1µF
EN1 EN0 Hi-Z/Low V
0 0 0 0V, (Sink current)
0 0 1 Hi-Z (No Connect)
01 x VCC (3.3V or 5.0V)
10 x V
1 1 x Hi-Z (No Connect)
1µF 1µF
V
PP IN
+12V +5V
8
2
7
MIC2557
3
6
4
5
PP OUT
PP
Pin Configuration
V
DD
0.1µF
Hi-Z/ Low Control
EN0
EN1
V
IN
PP
V
OUT
PP
+V
CC
GND EN1
2
MIC2557
3
4
8
7
6
5
V
DD
Hi-Z/Low
EN0
Simplified Block Diagram
EN0
EN1
Hi-Z/Low
V
DD
Decoder,
Driver &
Bias Control
V
PP IN
V
CC
High
Impedance or
Pull Down
Select
V
PP OUT
For a dual PCMCIA Card Socket VPP Switching Matrix, see the MIC2558.
For a VPP and VCC Switching Matrix, see the MIC2560.
2-4 1997
MIC2557 Micrel
Absolute Maximum Ratings (Notes 1 and 2)
Power Dissipation, T
SOIC 800 mW
Derating Factors (To Ambient)
SOIC 4 mW/°C
Storage Temperature –65°C to +150°C
Operating Temperature (Die) 125°C
Operating Temperature (Ambient) –40°C to +85°C
Lead Temperature (5 sec) 260°C
Supply Voltage, V
V
CC
V
DD
Logic Input Voltages –0.3V to V
Output Current
V
PP OUT
V
PP OUT
= 12V 600mA
= V
AMBIENT
PP IN
CC
≤ 25°C
15V
7.5V
7.5V
DD
250mA
Logic Block Diagram
2
V
DD
EN1
EN0
V
8
1
PP IN
5
V
V
DD
V
DD
6
V
DD
V
DD
V
PP IN
3
CC
V
2
PP OUT
HiZ/
LOW
1997 2-5
7
GND
4
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