View MIC2561_31570.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MIC2561
Micrel
MIC2561
PCMCIA Card Socket VCC & VPP Switching Matrix
General Description
The MIC2561 VCC & VPP Matrix controls PCMCIA (Personal Computer Memory Card International Association) memory card power supply pins, both VCC and VPP. The MIC2561 switches voltages from the system power supply to VCC and VPP. The MIC2561 switches between the three VCC voltages (OFF, 3.3V and 5.0V) and the VPP voltages (OFF, 0V, 3.3V, 5V, or 12.0V) required by PCMCIA cards. Output voltage is selected by two digital inputs for each output and output current ranges up to 750mA for VCC and 200mA for VPP. For higher VCC output current, please refer to the full-performance MIC2560. The MIC2561 provides power management capability under the control of the PC Card controller and features overcurrent and thermal protection of the power outputs, zero current "sleep" mode, suspend mode, low power dynamic mode, and ON/OFF control of the PCMCIA socket power. The MIC2561 is designed for efficient operation. In standby ("sleep") mode the device draws very little quiescent current, typically 0.01A. The device and PCMCIA port is protected by current limiting and overtemperature shutdown. Full crossconduction lockout protects the system power supply.
Applications
* * * * * * * * * PCMCIA Power Supply Pin Voltage Switch Data Collection Systems Machine Control Data Input Systems Wireless Communications Bar Code Data Collection Systems Instrumentation Configuration/Datalogging Docking Stations (portable and desktop) Power Supply Management Power Analog Switching
Features
* * * * * * * * * * * * * Complete PCMCIA V and V Switch Matrix in a CC PP Single IC No External Components Required Controlled Switching Times Logic Options for Compatible with Industry Standard PCMCIA Controllers No Voltage Overshoot or Switching Transients Break-Before-Make Switching Output Current Limit and Over-Temperature Shutdown Digital Flag for Error Condition Indication Ultra Low Power Consumption and V Voltages Digital Selection of V CC PP Over 750mA of V Output Current CC 200mA of V Output Current PP 14-Pin SOIC Package
Ordering Information
Part Number MIC2561-0BM MIC2561-1BM Temperature Range 0C to +70C 0C to +70C Package 14-pin SOIC 14-pin SOIC
Typical Application
5V System Power 3.3V Supply 12V
VPPIN VCC3IN VCC5IN
VPP1 VPP2 PCMCIA Card Slot
EN0 EN1 MIC2561 VCC VCC5_EN VCC3_EN
PCMCIA Card Slot Controller
2-30
1997
MIC2561
Micrel
(Notes 1 and 2) Supply Voltage, VPP IN ................................................... 15V VCC3 IN ....................................................... VCC5 IN VCC5 IN ............................................................. 7.5V Logic Input Voltages .................................. -0.3V to +15V Output Current (each Output) VPP OUT .............................................. Internally Limited VCC OUT ............................................ Internally Limited VCC OUT, Suspend Mode .............................. 600mA
Absolute Maximum Ratings
Power Dissipation, TAMBIENT 25C .... Internally Limited SOIC ............................................................ 800 mW Derating Factors (To Ambient) SOIC ........................................................... 4 mW/C Storage Temperature ............................ -65C to +150C Maximum Operating Temperature (Die) ................ 125C Operating Temperature (Ambient) .............. 0C to +70C Lead Temperature (5 sec) ...................................... 260C
Pin Configuration
VCC5_EN VCC3_EN EN0 EN1 FLAG VPP IN VPP OUT
14 2 3 4 5 6 7 13 12 11 10 9 8
GND VCC3 IN VCC OUT VCC3 IN VCC OUT VCC5 IN VCC OUT
2
14-Pin SO Package Note: Both VCC3 IN pins must be connected. All three VCC OUT pins must be connected.
Logic Block Diagram
VPP IN 550m EN1 VPP OUT
EN0
MIC2561 Control Logic
700m VCC OUT
VCC5_EN
210m 2
VCC3_EN VCC3 IN VCC5 IN Flag
ILimit / Thermal Shut Down
110m GND
1997
2-31
MIC2561
Micrel
(Over operating temperature range with VCC3 IN = 3.3V, VCC5 IN = 5.0V, VPP IN = 12V unless
Electrical Characteristics:
otherwise specified.) Symbol INPUT VIH VIL IIN Logic 1 Input Voltage Logic 0 Input Voltage Input Current Parameter
Conditions
Min
Typ
Max
Units
2.2 -0.3 0 V < VIN < 5.5V
15 0.8 1
V V A
VPP OUTPUT IPP OUT Hi-Z IPPSC RO High Impedance Output Leakage Current Short Circuit Current Limit Switch Resistance, IPP OUT = -1000mA (Sourcing) Shutdown Mode 0 VPP OUT 12V VPP OUT = 0 Select VPP OUT = 12V Select VPP OUT = 5V Select VPP OUT = 3.3V Select VPP OUT = Clamped to Ground 0.1 50 A
0.2 0.55 0.7 2 0.75 1 1 3 2
A
RO
Switch Resistance, IPP OUT = 50A (Sinking)
k
VPP SWITCHING TIME (See Figure 1) t1 t2 t3 t4 t5 t6 Output Turn-On Rise Time Output Turn-On Rise Time Output Turn-On Rise Time Output Rise Time Output Turn-Off Delay Output Turn-Off Delay VPP OUT = Hi-Z to 5V VPP OUT = Hi-Z to 3.3V VPP OUT = Hi-Z to 12V VPP OUT = 3.3V or 5V to 12V VPP OUT = 12V to 3.3V or 5V VPP OUT = 5V to Hi-Z 50 40 300 30 25 75 75 200 s s s s s ns
VCC OUTPUT ICC OUT Hi-Z ICCSC RO High Impedance Output Leakage Current Short Circuit Current Limit Switch Resistance, VCC OUT = 5.0V Switch Resistance, VCC OUT = 3.3V 1 VCC OUT 5V 0.1 10 A
VCC OUT = 0 ICC OUT = -650 mA (Sourcing)
1.5 210
2 300
A m
RO
ICC OUT = -650 mA (Sourcing)
110
185
m
2-32
1997
MIC2561
Micrel
Electrical Characteristics (continued)
Symbol Parameter Conditions Min Typ Max Units
VCC SWITCHING TIME t1 t2 t3 t4 Rise Time (10% to 90%) Rise Time (10% to 90%) Fall Time (note 3) Rise Time VCC OUT = 0V to 3.3V, IOUT = 750mA VCC OUT = 0V to 5.0V VCC OUT = 5.0V to 0V or 3.3V to 0V VCC OUT = Hi-Z to 5V 70 50 140 60 40 60 s s s s
POWER SUPPLY ICC5 VCC5 IN Supply Current ICC OUT = 0 0.01 10 A
2
ICC3
VCC3 IN Supply Current
VCC OUT = 5V or 3.3V, ICC OUT = 0 VCC OUT = Hi-Z (Sleep Mode)
30 0.01 15 0.01
100 10 30 10
A
IPP IN
VPP IN Supply Current IPP OUT =0
VCC Active, VPP OUT = 5V or 3.3V VPP OUT = HiZ, 0, or VPP
A
VCC5 IN VCC3 IN VPP IN
Operating Input Voltage Operating Input Voltage Operating Input Voltage
VCC5 IN VCC3 IN VCC3 IN VCC5 IN
VCC3 IN 2.8 8.0
5.0 3.3 12.0
6 VCC5 IN 14.5
V V V
SUSPEND MODE (NOTE 6) ICC3 Suspend Mode Active Current (from VCC3) VPP IN = 0V, VCC5 = VCC3 = 3.3V VCC5 = Enabled VPP = Disabled (Hi-Z or 0V) VPP IN = 0V, VCC5 = VCC3 = 3.3V VCC3 = Enabled VPP = Disabled (Hi-Z or 0V) 30 100 A
RON VCC
VCC OUT RON
4.5
6
NOTE 1: NOTE 2: NOTE 3: NOTE 6:
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. From 90% of VOUT to 10% of VOUT. RL = 2.1k Suspend mode is a pseudo power-down mode the MIC2561 automatically allows when VPP IN = 0V, VPP OUT is deselected, and VCC OUT = 3.3V is selected. Under these conditions, the MIC2561 functions in a reduced capacity mode where VCC output of 3.3V is allowed, but at lower current levels (higher switch ON resistance).
1997
2-33
MIC2561
Micrel
MIC2561-0 Control Logic Table Pin 1 VCC5_EN
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
Pin 2 VCC3_EN
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
Pin 4 EN1
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
Pin 3 EN0
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Pins 8 & 12 VCC OUT
High Z High Z High Z High Z 3.3 3.3 3.3 3.3 5 5 5 5 3.3 3.3 3.3 3.3
Pin 7 VPP OUT
High Z High Z High Z Clamped to Ground High Z 3.3 12 Clamped to Ground High Z 5 12 Clamped to Ground High Z 3.3 5 Clamped to Ground
MIC2561-1 Logic (Compatible with Cirrus Logic CL-PD6710 & CL-PD6720 Controllers) Pin 1 VCC5_EN
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
Pin 2 VCC3_EN
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
Pin 4 VPP_PGM
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
Pin 3 VPP_VCC
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Pins 8 & 12 VCC OUT
High Z High Z High Z High Z 5 5 5 5 3.3 3.3 3.3 3.3 High Z High Z High Z High Z
Pin 7 VPP OUT
Clamped to Ground High Z High Z High Z Clamped to Ground 5 12 High Z Clamped to Ground 3.3 12 High Z Clamped to Ground High Z High Z High Z
Note: other control logic patterns are available. Please contact Micrel for details.
2-34
1997
MIC2561
Micrel
Applications Information
PCMCIA VCC and V control is easily accomplished using PP the MIC2561 voltage selector/switch IC. Four control bits determine VCC OUT and VPP OUT voltage and standby/ operate mode condition. VPP OUT output voltages of VCC (3.3V or 5V), VPP, or a high impedance state are available. When the VCC high impedance condition is selected, the device switches into "sleep" mode and draws only nanoamperes of leakage current. An error flag falls low if the output is improper, because of overtemperature or overcurrent faults. Full protection from hot switching is provided which prevents feedback from the VPP OUT to the VCC inputs (from 12V to 5V, for example) by locking out the low voltage switch until VPP OUT drops below VCC. The VCC output is similarly protected against 5V to 3.3V shoot through. The MIC2561 is a low-resistance power MOSFET switching matrix that operates from the computer system main power supply. Device logic power is obtained from VCC3 and internal MOSFET drive is obtained from the VPP IN pin (usually +12V) during normal operation. If +12V is not available, the MIC2561 automatically switches into "suspend" mode, where VCC OUT can be switched to 3.3V, but at higher switch resistance. Internal break-before-make switches determine the output voltage and device mode.
Supply Bypassing
External capacitors are not required for operation. The MIC2561 is a switch and has no stability problems. For best results however, bypass VCC3 IN, VCC5 IN, and VPP IN inputs with filter capacitors to improve output ripple. As all internal device logic and voltage/current comparison functions are powered from the VCC3 IN line, supply bypass of this line is the most critical, and may be necessary in some cases. In the most stubborn layouts, up to 0.47F may be necessary. Both VCC OUT and VPP OUT pins may have 0.01F to 0.1F capacitors for noise reduction and electrostatic discharge (ESD) damage prevention. Larger values of output capacitor might create current spikes during transitions, requiring larger bypass capacitors on the VCC3 IN, VCC5 IN, and VPP IN pins.
PCMCIA Implementation
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 MIC2561, a MIC2557 PCMCIA VPP Switching Matrix, and a controller. Figure 3 shows this full configuration, supporting both 5.0V and 3.3V VCC operation.
2
5V System Power 3.3V Supply 12V
VPPIN VCC3IN VCC5IN
PCMCIA Card Slot VPP1 VPP2
EN0 EN1 MIC2561 VCC VCC5_EN VCC3_EN
PCMCIA Card Slot Controller
VPP IN VDD
VCC
EN0 EN1
VPP OUT MIC2557
Figure 3. MIC2561 Typical PCMCIA memory card application with dual VCC (5.0V or 3.3V) and separate VPP1 and VPP2. 1997 2-35
MIC2561
5V System Power 3.3V Supply 12V
VPPIN VCC3IN VCC5IN
Micrel
VPP1 VPP2 PCMCIA Card Slot
EN0 EN1 MIC2561 VCC VCC5_EN VCC3_EN
PCMCIA Card Slot Controller
Figure 4. MIC2561 Typical PCMCIA memory card application with dual VCC (5.0V or 3.3V). Note that VPP1 and VPP2 are driven together. However, many cost sensitive designs (especially notebook/ palmtop computers) connect VPP1 to VPP2 and the MIC2557 is not required. This circuit is shown in Figure 4. When a memory card is initially inserted, it should receive VCC -- either 3.3V 0.3V or 5.0V 5%. The initial voltage is determined by a combination of mechanical socket "keys" and voltage sense pins. 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 dual VCC. If the card is compatible with and desires a different VCC level, the controller commands this change by disabling VCC, waiting at least 100ms, and then re-enabling the other VCC voltage. If no card is inserted or the system is in sleep mode, the controller outputs a (VCC3 IN, VCC5 IN) = (0,0) to the MIC2561, which shuts down VCC. This also places the switch into a high impedance output shutdown (sleep) mode, where current consumption drops to nearly zero, with only tiny CMOS leakage currents flowing. During Flash memory programming with standard (+12V) Flash memories, the PCMCIA controller outputs a (1,0) to the EN0, EN1 control pins of the MIC2561, which connects VPP IN to VPP OUT. The low ON resistance of the MIC2561 switches allow using small bypass capacitors (in some cases, none at all) on the VCC OUT and VPP OUT pins, with the main filtering action performed by a large filter capacitor on the input supply voltage to VPP IN (usually the main power supply filter capacitor is sufficient). The VPP OUT transition from VCC to 12.0V typically takes 15s. After programming is completed, the controller outputs a (EN1, EN0) = (0,1) to the MIC2561, which then reduces VPP OUT to the VCC level for read verification. Break-before-make switching action reduces switching transients and lowers maximum current spikes through the switch from the output capacitor. The flag comparator prevents having high voltage on the VPP OUT capacitor from contaminating the VCC inputs, by disabling the low voltage VPP switches until VPP OUT drops below the VCC level selected. The lockout delay time varies with the load current and the capacitor on VPP OUT. With a 0.1F capacitor and nominal IPP OUT, the delay is approximately 250s. Internal drive and bias voltage is derived from VPP IN. Internal device control logic is powered from VCC3 IN. Input logic threshold voltages are compatible with common PCMCIA controllers using either 3.3V or 5V supplies. No pull-up resistors are required at the control inputs of the MIC2561.
Output Current and Protection
MIC2561 output switches are capable of more current than needed in PCMCIA applications and meet or exceed all PCMCIA specifications. For system and card protection, output currents are internally limited. For full system protection, long term (millisecond or longer) output short circuits invoke overtemperature shutdown, protecting the MIC2561, the system power supplies, the card socket pins, and the memory card. The MIC2561 overtemperature shutdown occurs at a die temperature of 110C.
Suspend Mode
An additional feature in the MIC2561 is a pseudo power-down mode, Suspend Mode, which allows operation without a V PP IN supply. In Suspend Mode, the MIC2561 supplies 3.3V to V OUT whenever a V output of 3.3V is enabled by the CC CC PCMCIA controller. This mode allows the system designer the ability to turn OFF the V supply generator to save PP power when it is not specifically required. The PCMCIA card receives V at reduced capacity during Suspend Mode, as CC the switch resistance rises to approximately 4.5.
High Current VCC Operation Without a +12V Supply
Figure 5 shows the MIC2561 with VCC switch bias provided by a simple charge pump. This enables the system designer to achieve full VCC performance without a +12V supply, which is often helpful in battery powered systems that only provide +12V when it is needed. These on-demand +12V 1997
2-36
MIC2561
Micrel
Switched VPP IN
0.1F Drive Enable
1N914
(Optional Schottky)
4.7k
0.02F
0.01F
1N914
+5V
14 2 3 4 5 6 7 13 12 11 10 9 8
2
Figure 5. Circuit for generating bias drive for the VCC switches when +12V is not readily available. supplies generally have a quiescent current draw of a few milliamperes, which is far more than the microamperes used by the MIC2561. The charge pump of Figure 5 provides this low current, using about 100A when enabled. When VPP OUT = 12V is selected, however, the on-demand VPP generator must be used, as this charge pump cannot deliver the current required for Flash memory programming. The Schottky diode may not be necessary, depending on the configuration of the on-demand +12V generator and whether any other loads are on this line.
1997
2-37

▲Up To Search▲

Price & Availability of MIC2561

	To Download MIC2561 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .