MIC2558
Micrel
2-10
1997
Ordering Information
Part Number
Temperature Range
Package
MIC2558BM
40
C to +85
C
14-pin SOIC
MIC2558BM T&R
40
C to +85
C
14-SO Tape & Reel*
* 2,500 Parts per reel.
MIC2558
PCMCIA Dual Card Socket V
PP
Switching Matrix
Features
Complete PCMCIA V
PP
Switch Matrix in a Single IC
Dual Matrix allows independent V
PP1
and V
PP2
Digital Selection of 0V, V
CC
, V
PP
, or High
Impedance Output
No V
PPOUT
Overshoot or Switching Transients
Break-Before-Make Switching
Ultra Low Power Consumption
120mA V
PP
(12V) Output Current
Optional Active Source Clamp for Zero Volt Condition
3.3V or 5V Supply Operation
14-Pin SOIC Package
General Description
The MIC2558 Dual V
PP
Matrix switches the four voltages
required by PCMCIA (Personal Computer Memory Card
International Association) card V
PP1
and V
PP2
Pins. The
MIC2558 provides selectable 0V, 3.3V, 5.0V, or 12.0V (
5%)
from the system power supply to V
PP1
and V
PP2
. Output
voltage is selected by two digital inputs per V
PP
pin. Output
current ranges up to 120mA. Four output states, V
PP
, V
CC
,
high impedance, and active logic low are available, and V
PP1
is independent of V
PP2
. An auxiliary control input determines
whether the high impedance (open) state or low logic state is
asserted.
In standby mode or full operation, the device draws very little
quiescent current, typically less than 1
A.
The MIC2558 is available in a 14-pin SOIC and a 14-pin
plastic DIP.
Applications
PCMCIA V
PP
Pin Voltage Switch
Power Supply Management
NC
EN11
EN01
MIC2558
+VCC1
VDD
Hi-Z/Low1
VPP OUT1
VPP IN
EN12
EN02
Hi-Z/Low2
GND
+VCC2
VPP OUT2
7
6
5
4
3
2
8
9
10
11
12
13
14
EN1
EN0 Hi-Z/Low V
PP OUT
0
0
0
0V, (Sink current)
0
0
1
Hi-Z (No Connect)
0
1
x
V
CC
(3.3V or 5.0V)
1
0
x
V
PP
1
1
x
Hi-Z (No Connect)
+3.3V or +5V
VPP OUT 1
0.1F
EN01
EN11
1F
1F
+12V
VPP IN
+5V
Hi-Z/ Low 1 Control
VDD
VCC
EN02
EN12
Hi-Z/ Low 2 Control
VPP OUT 2
0.1F
MIC2558
7
6
5
4
3
2
8
9
10
11
12
13
14
0.1F
Typical Application
Pin Configuration
1997
2-11
MIC2558
Micrel
2
Absolute Maximum Ratings
(Notes 1 and 2)
Power Dissipation, T
AMBIENT
25
C
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
VDD
VDD
VPP IN
EN11
VPP OUT1
VCC1
VPP IN
HiZ/
LOW1
EN01
VDD
VDD
VDD
3
1
13
12
14
11
VDD
VPP IN
EN12
GND
VPP OUT2
VCC2
HiZ/
LOW2
EN02
VDD
VDD
VDD
5
6
10
9
8
VPP IN
VDD
4
7
Supply Voltage, V
PP IN
15V
V
CC
7.5V
V
DD
7.5V
Logic Input Voltages
0.3V toV
DD
Output Current (each Output)
V
PP OUT
= 12V
600mA
V
PP OUT
= V
CC
250mA
Logic Block Diagram
MIC2558
Micrel
2-12
1997
Electrical Characteristics:
(Over operating temperature range with V
DD
= V
CC
= 5V, V
PP IN
= 12 V unless otherwise specified.)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
INPUT
V
IH
Logic 1 Input Voltage
2.2
V
V
IL
Logic 0 Input Voltage
0.8
V
V
IN
(Max)
Input Voltage Range
5
V
DD
V
I
IN
Input Current
0 V < V
IN
< V
DD
1
A
EACH OUTPUT
V
OL
Clamp Low Output Voltage
EN0 = EN1 = HiZ = 0, I
SINK
= 1.6mA
0.4
V
I
OUT
, Hi-Z
High Impedance Output
EN0 = EN1 = 0, HiZ = 1.
1
10
A
Leakage Current
0
V
PP OUT
12V
R
OC
Clamp Low Output Resistance
Resistance to Ground. I
SINK
= 2mA
130
250
EN0 = EN1 = 0, HiZ = 0.
R
O
Switch Resistance,
I
PP OUT
= 10 mA (Sourcing)
2.5
5
V
PP OUT
= V
CC
R
O
Switch Resistance,
I
PP OUT
= 100 mA (Sourcing)
0.5
1
V
PP OUT
= V
PP IN
SWITCHING TIME (See Figure 1)
t
1
Delay + Rise Time
V
PP OUT
= 0V to 5V (Notes 3, 5)
15
50
s
t
2
Delay + Rise Time
V
PP OUT
= 5V to 12V (Notes 3, 5)
12
50
s
t
3
Delay + Fall Time
V
PP OUT
= 12V to 5V (Notes 3, 5)
25
75
s
t
4
Delay + Fall Time
V
PP OUT
= 5V to 0V (Notes 3, 5)
45
100
s
t
5
Output Turn-On Delay
V
PP OUT
= Hi-Z to 5V (Notes 4, 5)
10
50
s
t
6
Output Turn-Off Delay
V
PP OUT
= 5V to Hi-Z (Notes 4, 5)
75
200
ns
POWER SUPPLY
I
DD
V
DD
Supply Current
1
A
I
CC
V
CC
Supply Current
I
PP OUT
= 0
1
A
I
PP
I
PP
Supply Current
V
PP OUT1
= V
PPOUT2
= 0 V or V
PP
.
10
A
I
PPOUT
= 0.
V
PP OUT1
= V
PPOUT2
= V
CC
20
80
A
1997
2-13
MIC2558
Micrel
2
V
CC
Operating Input Voltage
6
V
V
DD
Operating Input Voltage
2.8
6
V
V
PP IN
Operating Input Voltage
8.0
14.5
V
NOTE 1:
Functional operation above the absolute maximum stress ratings is not implied.
NOTE 2:
Static-sensitive device. Store only in conductive containers. Handling personnel and equipment should be grounded to
prevent damage from static discharge.
NOTE 3:
With R
L
= 2.9k
and C
OUT
= 0.1
F on V
PP OUT
.
NOTE 4:
R
L
= 2.9k
. R
L
is connected to V
CC
during t
5
, and is connected to ground during t
6
.
NOTE 5:
Rise and fall times are measured to 90% of the difference of initial and final values.
Electrical Characteristics (continued)
Hi-Z/Low
EN0
EN1
12V
5V
VPP OUT
0
t1
t2
t3
3V
0
3V
0
3V
0
t5
t6
t4
Figure 1. Timing Diagram.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
POWER SUPPLY, continued
MIC2558
Micrel
2-14
1997
Applications Information
PCMCIA V
PP1
and V
PP2
control is easily accomplished
using the MIC2558 voltage selector/switch IC. Two control
bits per V
PP OUT
pin determine output voltage and standby/
operate mode condition. Output voltages of 0V (defined as
less than 0.4V), V
CC
(3.3V or 5V), V
PP
, or a high impedance
state, are available. When either the high impedance or low
voltage conditions are selected, the device switches into
"sleep" mode and draws only nanoamperes of leakage
current.
The MIC2558 is a dual low-resistance power MOSFET
switching matrix that operates from the computer system
main power supply. Device power is obtained from V
DD
,
which may be either 3.3V or 5V, and FET drive is obtained
from V
PP IN
(usually +12V). Internal break-before-make
switches determine the output voltage and device mode.
V
PP1
and V
PP2
are completely indepenent from each other.
Supply Bypassing
For best results, bypass V
CC
and V
PP IN
inputs with 1
F
capacitors. Both V
PP OUT
pins should have a 0.01
F to
0.1
F capacitor for noise reduction and electrostatic dis-
charge (ESD) damage prevention. Larger values of output
capacitor will create large current spikes during transitions,
requiring larger bypass capacitors on the V
CC
and V
PP IN
pins.
Figure 3. MIC2558 Typical two slot PCMCIA applica-
tion with single 5.0V V
CC
.
System
Power
Supply
PCMCIA
Card Slot
Controller
MIC2558
PCMCIA
Card Slot
A
PCMCIA
Card Slot
B
MIC2558
5V
12V
EN01
EN11
EN12
EN02
EN11
EN01
EN12
EN02
VPP1
VPP2
VCC
VPP1
VPP2
VCC
VCC Switch
VPP IN
VCC
VPP IN
VCC
PCMCIA Implementation
The Personal Computer Memory Card International Asso-
ciation (PCMCIA) specification requires two V
PP
supply pins
per PCMCIA slot. V
PP
is primarily used for programming
Flash (EEPROM) memory cards. The two V
PP
supply pins
may be programmed to different voltages. Fully implement-
ing PCMCIA specifications requires a MIC2558 and a con-
troller. Figure 2 shows this full configuration, supporting both
5.0V and 3.3V V
CC
operation. Figure 3 is a simplified design
with fixed V
CC
= 5V.
When a memory card is initially inserted, it should receive
V
CC
-- usually 5.0V
5%. The card sends a handshaking
data stream to the controller, which then determines whether
or not this card requires V
PP
and if the card is designed for
5.0V or 3.3V V
CC
. If the card uses 3.3V V
CC
, the controller
commands this change, which is reflected on the V
CC
pins of
both the PCMCIA slot and the MIC2558.
During Flash memory programming, the PCMCIA controller
outputs a (1,0) to one or both halves of the MIC2558, which
connects V
PP IN
to V
PP OUT1
and/or V
PP OUT2
. The low ON
resistance of the MIC2558 switch requires only a small
bypass capacitor on the V
PP OUT
pins, with the main filtering
System
Power
Supply
PCMCIA
Card Slot
Controller
VCC Select and
Switch
MIC2558
PCMCIA
Card Slot
A
PCMCIA
Card Slot
B
VCC Select and
Switch
MIC2558
5V
3.3V
12V
EN01
EN11
EN12
EN02
EN11
EN01
EN12
EN02
VPP1
VPP2
VCC
VPP1
VPP2
VCC
VPP IN
VCC
VPP IN
VCC
Figure 2. MIC2558 Typical two slot PCMCIA applica-
tion with dual V
CC
(5.0V or 3.3V).
1997
2-15
MIC2558
Micrel
2
action performed by a large filter capacitor on V
PP IN
. The
V
PP OUT
transition from V
CC
to 12.0V typically takes 25
S.
After programming is completed, the controller outputs a
(0,1) to the MIC2558, which then reduces V
PP OUT
to the
V
CC
level. Break-before-make switching action reduces
switching transients and lowers maximum current spikes
through the switch from the output capacitor.
If no card is inserted, or the system is in sleep mode, the
controller outputs either a (0,0) or a (1,1) to the MIC2558.
Either input places the switch into shutdown mode, where
current consumption drops even further.
The HiZ/Low input controls the optional logic low output
clamp. With HiZ/Low in the high state and EN0 = EN1 = 0,
V
PP OUT
enters a high impedance (open) state. With HiZ/
Low in the low state and EN0 = EN1 = 0, V
PP OUT
is clamped
to ground, providing a logic low signal. The clamp does not
require any DC bias current for operation.
Figure 3. Full PCMCIA Implementation of V
PP
and V
CC
switching using MIC2558 and MIC2951 voltage regulator.
VPP OUT 1
0.1F
EN01
EN11
1F
+12V
VPP IN
+5V
Hi-Z/ Low 1 Control
VDD
EN02
EN12
Hi-Z/ Low 2 Control
VPP OUT 2
0.1F
MIC2558
7
6
5
4
3
2
8
9
10
11
12
13
14
0.1F
MIC2951
SD
V
GND
4
7
8
OUT
+VIN
FB
1
3
SHUTDOWN
INPUT
100pF
2N2222
1%
300k
VIN = +5.3V to +15V
1%
180k
+
3.3F
470 k
OFF
ON
220k
1%
TTL Logic Level
High (V > 1.5V) VCC = 5.0V
Low (V < 0.5V) VCC = 3.3V
VCC Switching and Control Block
MOSFET drive and bias voltage is derived from V
PP IN
.
Internal device control logic is powered from V
DD
, which
should be connected to the same supply voltage as the
PCMCIA controller (normally either 3.3V or 5V).
Output Current
MIC2558 output switches are capable of far more current
than usually needed in PCMCIA applications. PCMCIA V
PP
output current is limited primarily by switch resistance voltage
drop (I x R) and the requirement that V
PP OUT
cannot drop
more than 5% below nominal. V
PP OUT
will survive output
short circuits to ground if V
PP IN
or V
CC
are current limited by
the regulator that supplies these voltages.
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