Datasheet MIC2558BM Datasheet (MICREL)

MIC2558 Micrel

MIC2558

PCMCIA Dual Card Socket VPP Switching Matrix

General Description

The MIC2558 Dual VPP Matrix switches the four voltages required by PCMCIA (Personal Computer Memory Card International Association) card V

PP1

and V

Pins. The

PP2

MIC2558 provides selectable 0V, 3.3V, 5.0V, or 12.0V (±5%) from the system power supply to V

PP1

and V

. Output

PP2

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 V is independent of V

. An auxiliary control input determines

PP2

PP1

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 1µA.

The MIC2558 is available in a 14-pin SOIC and a 14-pin plastic DIP.

Applications

• PCMCIA VPP Pin Voltage Switch

• Power Supply Management

Features

• Complete PCMCIA VPP Switch Matrix in a Single IC

• Dual Matrix allows independent V

PP1

and V

PP2

• Digital Selection of 0V, VCC, VPP, or High Impedance Output

• No V

PPOUT

Overshoot or Switching Transients

• Break-Before-Make Switching

• Ultra Low Power Consumption

• 120mA VPP (12V) Output Current

• Optional Active Source Clamp for Zero Volt Condition

• 3.3V or 5V Supply Operation

• 14-Pin SOIC Package

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.

Typical Application

V

PP IN

+12V

V

PP OUT 1

V

PP OUT 2

0.1µF

1µF 1µF

V

CC

+3.3V or +5V

2 3

MIC2558

4 5 6 7

Pin Configuration

V

DD

+5V

0.1µF

14 13 12 11 10

9 8

Hi-Z/ Low 1 Control EN0

1

EN1

1

Hi-Z/ Low 2 Control EN0

2

EN1

2

V

PP

OUT1

+V

CC1

V

PP

+V

CC2

GND

OUT2

NC

IN

2 3

MIC2558

4 5 6

7

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)

14 13

12 11 10

9 8

PP OUT

PP

V

DD Hi-Z/Low1 EN0

1

EN1

1

Hi-Z/Low2 EN0

2

EN1

2

2-10 1997

MIC2558 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

AMBIENT

≤ 25°C

Supply Voltage, V

V

CC

V

DD

Logic Input Voltages –0.3V toV Output Current (each Output)

V

PP OUT

V

PP OUT

PP IN

= 12V 600mA = V

CC

15V

7.5V

DD

250mA

Logic Block Diagram

V

DD

EN1

EN0

HiZ/ LOW

V

14

PP IN

4

2

1

11

V

CC1

V

DD

V

DD

1

12

V

DD

13

1

V

DD

V

DD

V

PP IN

3

V

PP OUT1

1

EN1

2

8

V

PP IN

EN0

V

DD

V

DD

2

9

V

DD

V

DD

HiZ/ LOW

1997 2-11

10

2

5

6

V

PP IN

V

CC2

GND

7

V

PP OUT2

MIC2558 Micrel

Electrical Characteristics:

(Over operating temperature range with V

DD

= VCC= 5V, V

= 12 V unless otherwise specified.)

PP IN

Symbol Parameter Conditions Min Typ Max Units

INPUT

V

IH

V

IL

VIN (Max) Input Voltage Range –5 V I

IN

Logic 1 Input Voltage 2.2 V Logic 0 Input Voltage 0.8 V

DD

Input Current 0 V < VIN < V

DD

±1 µA

EACH OUTPUT

V

OL

I

, Hi-Z High Impedance Output EN0 = EN1 = 0, HiZ = 1. 1 10 µA

OUT

R

OC

R

O

Clamp Low Output Voltage EN0 = EN1 = HiZ = 0, I

Leakage Current 0 ≤ V

PP OUT

≤ 12V

Clamp Low Output Resistance Resistance to Ground. I

EN0 = EN1 = 0, HiZ = 0.

Switch Resistance, I V

PP OUT

= V

CC

PP OUT

= –10 mA (Sourcing) 2.5 5 Ω

= 1.6mA 0.4 V

SINK

= 2mA 130 250 Ω

SINK

V

R

O

Switch Resistance, I V

PP OUT

= V

PP IN

SWITCHING TIME (See Figure 1) t

1

t

2

t

3

t

4

t

5

t

6

Delay + Rise Time V

Delay + Fall Time V

Output Turn-On Delay V

Output Turn-Off Delay V

POWER SUPPLY

I

DD

CC

VDD Supply Current – 1 µA

VCC Supply Current I

PP OUT

= –100 mA (Sourcing) 0.5 1 Ω

= 0V to 5V (Notes 3, 5) 15 50 µs

= 5V to 12V (Notes 3, 5) 12 50 µs

= 12V to 5V (Notes 3, 5) 25 75 µs

= 5V to 0V (Notes 3, 5) 45 100 µs

= Hi-Z to 5V (Notes 4, 5) 10 50 µs

= 5V to Hi-Z (Notes 4, 5) 75 200 ns

= 0 – 1 µA

I

PP

IPP Supply Current V

PP OUT1

I

PPOUT

V

PP OUT1

= V

PPOUT2

= 0 V or VPP . – 10 µA

= 0.

= V

PPOUT2

= V

CC

20 80 µA

2-12 1997

MIC2558 Micrel

Electrical Characteristics (continued)

Symbol Parameter Conditions Min Typ Max Units POWER SUPPLY, continued

V

CC

VDDOperating Input Voltage 2.8 6 V

V

PP IN

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

NOTE 3: With RL = 2.9kΩ and C NOTE 4: RL = 2.9kΩ. RL is connected to VCC during t5, and is connected to ground during t6. NOTE 5: Rise and fall times are measured to 90% of the difference of initial and final values.

Operating Input Voltage 6V

Operating Input Voltage 8.0 14.5 V

prevent damage from static discharge.

= 0.1µF on V

OUT

PP OUT

.

3V

Hi-Z/Low

0

2

EN0

EN1

PP OUT

3V

0

3V

0

12V

5VV

0

t

1

t

2

t

3

t

4

t

5

t

6

Figure 1. Timing Diagram.

1997 2-13

MIC2558 Micrel

Applications Information

12V

5V

EN0

EN1

1

VCC Switch

V

PP IN

MIC2558

V

CC

V

CC

V

PP1

PCMCIA

Card Slot

A

PCMCIA V using the MIC2558 voltage selector/switch IC. Two control bits per V

PP

1

PP OUT

and V

control is easily accomplished

PP2

pin determine output voltage and standby/ operate mode condition. Output voltages of 0V (defined as less than 0.4V), V

(3.3V or 5V), VPP, or a high impedance

CC

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.

System

Power

Supply

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 VDD, which may be either 3.3V or 5V, and FET drive is obtained from V

(usually +12V). Internal break-before-make

PP IN

switches determine the output voltage and device mode. V

PP1

and V

are completely indepenent from each other.

PP2

Supply Bypassing

For best results, bypass V capacitors. Both V

PP OUT

CC

and V

inputs with 1µF

PP IN

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 V

System

Power

Supply

5V

3.3V

12V

EN0

EN1

V

CC

1

Select and

Switch

V

PP IN

MIC2558

and V

CC

V

CC

V

CC

V

PP1

PP IN

PCMCIA

Card Slot

pins.

A

EN0

PCMCIA

Card Slot

Controller

EN1

EN0

EN1

EN0 EN1

2

V

1

2 2

PP IN

MIC2558

V

CC

V

PP2

V

CC

V

PP1

PCMCIA

Card Slot

V

PP2

Figure 3. MIC2558 Typical two slot PCMCIA applica-

tion with single 5.0V VCC.

PCMCIA Implementation

B

EN0

PCMCIA

Card Slot

Controller

2

EN1

2

VCC Select and

Switch

EN0

1

V

PP IN

EN1

1

EN0

2

EN1

2

MIC2558

V

CC

V

PP2

V

CC

V

PP1

PCMCIA

Card Slot

B

V

PP2

Figure 2. MIC2558 Typical two slot PCMCIA applica-

tion with dual VCC (5.0V or 3.3V).

The Personal Computer Memory Card International Association (PCMCIA) specification 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 MIC2558 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.

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 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

2-14 1997

MIC2558 Micrel

action performed by a large filter capacitor on V V

PP OUT

transition from VCC to 12.0V typically takes 25µS.

PP IN

. The

After programming is completed, the controller outputs a (0,1) to the MIC2558, which then reduces V

PP 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 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

Low in the low state and EN0 = EN1 = 0, V

enters a high impedance (open) state. With HiZ/

PP OUT

is clamped to ground, providing a logic low signal. The clamp does not require any DC bias current for operation.

V

PP IN

+12V

V

PP OUT 1

0.1µF 1µF

MOSFET drive and bias voltage is derived from V

PP 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

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 more than 5% below nominal. V short circuits to ground if V

PP IN

PP OUT

or VCC are current limited by

PP OUT

cannot drop

will survive output

the regulator that supplies these voltages.

V

DD

+5V

0.1µF

14 2 3

MIC2558

4 5 6 7

13

12

11

10

9 8

Hi-Z/ Low 1 Control EN0

1

EN1

1

Hi-Z/ Low 2 Control EN0

2

EN1

2

.

2

V

PP OUT 2

0.1µF

SHUTDOWN INPUT

ON

TTL Logic Level

High (V > 1.5V) VCC = 5.0V

Low (V < 0.5V) VCC = 3.3V

OFF

3

SD

GND

4

8

+V

IN

MIC2951

470 kΩ

V

7

OUT

FB

VIN = +5.3V to +15V

1

100pF

220kΩ

1%

2N2222

300kΩ

1%

180kΩ

1%

+

3.3µF

VCC Switching and Control Block

Figure 3. Full PCMCIA Implementation of VPP and VCC switching using MIC2558 and MIC2951 voltage regulator.

1997 2-15