MICREL MIC2559

MIC2559
Micrel
MIC2559
PCMCIA Dual Card Socket VPP Switching Matrix
Not Recommended for New Designs
General Description
Features
The MIC2559 Dual VPP Matrix switches the four voltages
required by PCMCIA (Personal Computer Memory Card
International Association) card VPP1 and VPP2 Pins. The
MIC2559 provides selectable 0V, 3.3V, 5.0V, or 12.0V (±5%)
from the system power supply to VPP1 and VPP2. Output
voltage is selected by two digital inputs per VPP pin. Output
current ranges up to 120mA. Four output states, VPP, VCC,
high impedance, and active logic low are available, and VPP1
is independent of VPP2. An auxiliary control input determines
whether the high impedance (open) state or low logic state is
asserted.
•
Complete PCMCIA VPP Switch Matrix in a Single IC
•
Dual Matrix allows independent VPP1 and VPP2
•
Digital Selection of 0V, VCC, VPP, or High Imped–
ance Output
•
No VPPOUT Overshoot or Switching Transients
•
Break-Before-Make Switching
•
Ultra Low Power Consumption
•
120mA V
In standby mode or full operation, the device draws very little
quiescent current, typically less than 1µA.
•
Optional Active Source Clamp for Zero Volt Condition
•
3.3V or 5V Supply Operation
The MIC2559 is available in a 14-pin SOIC.
•
14-Pin SOIC Package
PP
(12V) Output Current
Ordering Information
Applications
•
PCMCIA VPP Pin Voltage Switch
•
Power Supply Management
Part Number
Temperature Range
Package
MIC2559BM
–40°C to +85°C
14-pin SOIC
MIC2559BM T&R
–40°C to +85°C
14-SO Tape & Reel*
* 2,500 Parts per reel.
Pin Configuration
Typical Application
VPP IN
VCC
+12V +3.3V or +5V
VDD
+5V
0.1µF
VPP OUT 1
14
2
13
3
12
MIC2559
4
11
0.1µF
1µF
1µF
5
10
6
9
7
8
Hi-Z/ Low 1 Control
EN01
EN11
Hi-Z/ Low 2 Control
EN02
EN12
VPP OUT1
NC
+VCC1
VPP IN
+VCC2
GND
VPP OUT2
14
2
13
3
12
MIC2559
4
11
5
10
6
9
7
8
VDD
Hi-Z/Low1
EN01
EN11
Hi-Z/Low2
EN02
EN12
VPP OUT 2
0.1µF
EN1
2-16
EN0 Hi-Z/Low VPP OUT
0
0
0
0V, (Sink current)
0
0
1
Hi-Z (No Connect)
0
1
x
V
1
0
x
V
1
1
x
Hi-Z (No Connect)
CC
(3.3V or 5.0V)
PP
April 1998
MIC2559
Micrel
Absolute Maximum Ratings
(Notes 1 and 2)
Power Dissipation, TAMBIENT ≤ 25°C
Derating Factors (To Ambient)
Storage Temperature
Operating Temperature (Die)
Operating Temperature (Ambient)
Lead Temperature (5 sec)
800 mW
4 mW/°C
–65°C to +150°C
125°C
–40°C to +85°C
260°C
Supply Voltage, VPP IN
VCC
VDD
Logic Input Voltages
Output Current (each Output)
VPP OUT = 12V
VPP OUT = VCC
15V
7.5V
7.5V
–5V toVDD
600mA
250mA
Logic Block Diagram
VPP IN
VDD
14
EN11
4
2
11
VDD
VPP IN
3
VCC1
VDD
EN01
12
VDD
VDD
HiZ/
LOW1
1
VPP OUT1
13
VDD
EN12
VPP IN
8
VDD
VPP IN
5
VCC2
VDD
EN02
9
VDD
VDD
HiZ/
LOW2
April 1998
7
10
6
2-17
GND
VPP OUT2
MIC2559
Micrel
Electrical Characteristics:
Symbol
(Over operating temperature range with VDD = VCC= 5V, VPP IN = 12 V unless otherwise specified.)
Parameter
Conditions
Min
Typ
Max
Units
INPUT
VIH
Logic 1 Input Voltage
VIL
Logic 0 Input Voltage
VIN (Max)
Input Voltage Range
IIN
Input Current
2.2
V
0.8
V
VDD
V
0 V < VIN < VDD
±1
µA
0.4
V
1
10
µA
–5
EACH OUTPUT
VOL
Clamp Low Output Voltage
EN0 = EN1 = HiZ = 0, ISINK = 1.6mA
IOUT, Hi-Z
High Impedance Output
Leakage Current
EN0 = EN1 = 0, HiZ = 1.
0 ≤ VPP OUT ≤ 12V
ROC
Clamp Low Output Resistance
Resistance to Ground. ISINK = 2mA
EN0 = EN1 = 0, HiZ = 0.
130
250
Ω
RO
Switch Resistance,
VPP OUT = VCC
IPP OUT = –100 mA (Sourcing)
TA = –40°C to +60°C
0.8
1.5
Ω
RO
Switch Resistance,
VPP OUT = VPP IN
IPP OUT = –100 mA (Sourcing)
0.5
1
Ω
SWITCHING TIME (See Figure 1)
t1
Delay + Rise Time
VPP OUT = 0V to 5V (Notes 3, 5)
15
50
µs
t2
Delay + Rise Time
VPP OUT = 5V to 12V (Notes 3, 5)
12
50
µs
t3
Delay + Fall Time
VPP OUT = 12V to 5V (Notes 3, 5)
25
75
µs
t4
Delay + Fall Time
VPP OUT = 5V to 0V (Notes 3, 5)
45
100
µs
t5
Output Turn-On Delay
VPP OUT = Hi-Z to 5V (Notes 4, 5)
10
50
µs
t6
Output Turn-Off Delay
VPP OUT = 5V to Hi-Z (Notes 4, 5)
75
200
ns
–
1
µA
POWER SUPPLY
IDD
VDD Supply Current
ICC
VCC Supply Current
IPP OUT = 0
–
1
µA
IPP
IPP Supply Current
VPP OUT1 = VPPOUT2 = 0 V or VPP .
IPPOUT = 0.
–
10
µA
VPP OUT1 = VPPOUT2 = VCC
20
80
µA
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MIC2559
Micrel
Electrical Characteristics (continued)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
6
V
POWER SUPPLY, continued
VCC
Operating Input Voltage
VDD
Operating Input Voltage
2.8
6
V
VPP IN
Operating Input Voltage
8.0
14.5
V
NOTE 1:
NOTE 2:
NOTE 3:
NOTE 4:
NOTE 5:
Functional operation above the absolute maximum stress ratings is not implied.
Static-sensitive device. Store only in conductive containers. Handling personnel and equipment should be grounded to
prevent damage from static discharge.
With RL = 2.9kΩ and COUT = 0.1µF on VPP OUT.
RL = 2.9kΩ. RL is connected to VCC during t5, and is connected to ground during t6.
Rise and fall times are measured to 90% of the difference of initial and final values.
3V
Hi-Z/Low
0
3V
EN0
0
3V
EN1
0
12V
VPP OUT
5V
0
t1
t2
t3
t4
Figure 1. Timing Diagram.
April 1998
2-19
t5
t6
2
MIC2559
Micrel
Applications Information
5V
PCMCIA VPP1 and VPP2 control is easily accomplished
using the MIC2559 voltage selector/switch IC. Two control
bits per VPP OUT pin determine output voltage and standby/
operate mode condition. Output voltages of 0V (defined as
less than 0.4V), VCC (3.3V or 5V), VPP, 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.
EN01
VCC
VPP1
PCMCIA
Card Slot
A
MIC2558
MIC2559
EN02
VPP2
EN12
PCMCIA
Card Slot
Controller
For best results, bypass VCC and VPP IN inputs with 1µF
capacitors. Both VPP OUT pins should have a 0.01µF to
0.1µF capacitor for noise reduction and electrostatic discharge (ESD) damage prevention. Larger values of output
capacitor will create large current spikes during transitions,
requiring larger bypass capacitors on the VCC and VPP IN pins.
VCC Select and
Switch
VPP IN
EN11
Supply Bypassing
5V
VCC
12V
The MIC2559 is a dual low-resistance power MOSFET
switching matrix that operates from the computer system
main power supply. Device power is obtained from VDD,
which may be either 3.3V or 5V, and FET drive is obtained
from VPP IN (usually +12V). Internal break-before-make
switches determine the output voltage and device mode.
VPP1 and VPP2 are completely indepenent from each other.
System
Power 3.3V
Supply
VCC Switch
System
Power
Supply
VCC
EN01
VPP IN
VCC
VPP1
EN11
PCMCIA
Card Slot
B
MIC2558
MIC2559
EN02
VCC
VPP2
EN12
12V
EN01
VPP IN
VCC
VPP1
Figure 3. MIC2559 Typical two slot PCMCIA application with single 5.0V VCC.
EN11
PCMCIA
Card Slot
A
MIC2558
MIC2559
EN02
The Personal Computer Memory Card International Association (PCMCIA) specification, version 2.0 (September,
1991), requires two VPP supply pins per PCMCIA slot. VPP
is primarily used for programming Flash (EEPROM) memory
cards. The two VPP supply pins may be programmed to
different voltages. Fully implementing PCMCIA specifications requires a MIC2559 and a controller. Figure 2 shows
this full configuration, supporting both 5.0V and 3.3V VCC
operation. Figure 3 is a simplified design with fixed VCC = 5V.
VPP2
EN12
PCMCIA
Card Slot
Controller
VCC Select and
Switch
EN01
VPP IN
VCC
VCC
VPP1
EN11
PCMCIA
Card Slot
B
MIC2558
MIC2559
EN02
PCMCIA Implementation
VPP2
EN12
Figure 2. MIC2559 Typical two slot PCMCIA application with dual VCC (5.0V or 3.3V).
When a memory card is initially inserted, it should receive
VCC — usually 5.0V ±5%. The card sends a handshaking
data stream to the controller, which then determines whether
or not this card requires VPP and if the card is designed for
5.0V or 3.3V VCC. If the card uses 3.3V VCC, the controller
commands this change, which is reflected on the VCC pins of
both the PCMCIA slot and the MIC2559.
During Flash memory programming, the PCMCIA controller
outputs a (1,0) to one or both halves of the MIC2559, which
connects VPP IN to VPP OUT1 and/or VPP OUT2. The low ON
resistance of the MIC2559 switch requires only a small
bypass capacitor on the VPP OUT pins, with the main filtering
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MIC2559
Micrel
action performed by a large filter capacitor on VPP IN. The
VPP OUT transition from VCC to 12.0V typically takes 25µS.
After programming is completed, the controller outputs a
(0,1) to the MIC2559, which then reduces VPP OUT to the
VCC 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 MIC2559.
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,
VPP OUT enters a high impedance (open) state. With HiZ/
Low in the low state and EN0 = EN1 = 0, VPP OUT is clamped
to ground, providing a logic low signal. The clamp does not
require any DC bias current for operation.
MOSFET drive and bias voltage is derived from VPP IN.
Internal device control logic is powered from VDD, which
should be connected to the same supply voltage as the
PCMCIA controller (normally either 3.3V or 5V).
Output Current
MIC2559 output switches are capable of far more current
than usually needed in PCMCIA applications. PCMCIA VPP
output current is limited primarily by switch resistance voltage
drop (I x R) and the requirement that VPP OUT cannot drop
more than 5% below nominal. VPP OUT will survive output
short circuits to ground if VPP IN or VCC are current limited by
the regulator that supplies these voltages.
2
VDD
+5V
VPP IN
+12V
0.1µF
VPP OUT 1
14
2
Hi-Z/ Low 1 Control
EN01
EN11
Hi-Z/ Low 2 Control
EN02
EN12
13
3
12
MIC2559
4
11
0.1µF
1µF
5
10
6
9
7
8
VPP OUT 2
0.1µF
8
+V IN
VOUT 1
SHUTDOWN 3
SD
INPUT
MIC2951
OFF
+
ON
100pF
TTL Logic Level
GND
4
FB
300kΩ
1%
3.3µF
7
High (V > 1.5V) VCC = 5.0V
470 kΩ
220kΩ
1%
180kΩ
1%
2N2222
Low (V < 0.5V) VCC = 3.3V
VCC Switching and Control Block
Figure 3. Full PCMCIA Implementation of VPP and VCC switching using MIC2559 and MIC2951 voltage regulator.
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