MIC2557_11 Datasheet, PDF (1/8 Pages) Micrel Semiconductor – PCMCIA Card Socket VPP Switching Matrix Final Information

MIC2557
Micrel
MIC2557
PCMCIA Card Socket V_PP Switching Matrix
Final Information
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 (±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 1µA.
The MIC2557 is available in an 8-pin SOIC and an 8-pin
plastic DIP.
Applications
• PCMCIA V_PP Pin Voltage Switch
• Power Supply Management
• Power Analog Switch
Features
• Complete PCMCIA V_PP Switch Matrix in a Single IC
• No External Components Required
• Digital Selection of 0V, V_CC, V_PP, or High Imped–
ance Output
• No V_{PP OUT} Overshoot or Switching Transients
• Break-Before-Make Switching
• Low Power Consumption
• 120mA V_PP (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
VCC
VPP _IN
+3.3V or +5V +12V
VPP(n) _OUT
0.1µF 1µF
1µF
VDD
+5V
8
2
7
MIC2557
3
6
4
5
Pin Configuration
0.1µF
VPP IN
VPP OUT
+VCC
GND
Hi-Z/ Low Control
EN0
EN1
8
2
7
MIC2557
3
6
4
5
VDD
Hi-Z/Low
EN0
EN1
Simplified Block Diagram
EN1 EN0 Hi-Z/Low V_{PP OUT}
00
0
0V, (Sink current)
00
1
Hi-Z (No Connect)
01
10
11
x
V_CC (3.3V or 5.0V)
x
V_PP
x
Hi-Z (No Connect)
VDD
VPP _IN
VCC
EN0
EN1
Hi-Z/Low
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.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
1997
1
MIC2557