View MIC2558_31564.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 VPP1 and VPP2 Pins. The MIC2558 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. In standby mode or full operation, the device draws very little quiescent current, typically less than 1A. The MIC2558 is available in a 14-pin SOIC and a 14-pin plastic DIP.
Features
* * * * * * * * * * Complete PCMCIA VPP Switch Matrix in a Single IC Dual Matrix allows independent VPP1 and VPP2 Digital Selection of 0V, VCC, VPP, or High Impedance Output No VPPOUT 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
Part Number Temperature Range -40C to +85C -40C to +85C Package 14-pin SOIC 14-SO Tape & Reel*
Ordering Information
MIC2558BM MIC2558BM T&R
Applications
* * PCMCIA VPP Pin Voltage Switch Power Supply Management
* 2,500 Parts per reel.
Typical Application
VPP IN VCC +12V +3.3V or +5V VDD +5V
Pin Configuration
VPP OUT1 NC +VCC1 VPP IN +VCC2 GND VPP OUT2
14 2 13
VDD Hi-Z/Low1 EN01 EN11 Hi-Z/Low2 EN02 EN12
0.1F VPP OUT 1
2 14 13
3 12 MIC2558 4 11 5 6 7 10 9 8
0.1F 1F 1F
3 12 MIC2558 4 11 5 6 7 10 9 8
Hi-Z/ Low 1 Control EN01 EN11 Hi-Z/ Low 2 Control EN02 EN12
VPP OUT 2
0.1F
EN1
0 0 0 1 1
EN0 Hi-Z/Low VPP OUT
0 0 1 0 1 0 1 x x x 0V, (Sink current) Hi-Z (No Connect) V V
CC PP
(3.3V or 5.0V)
Hi-Z (No Connect)
2-10
1997
MIC2558
Micrel
(Notes 1 and 2) 800 mW 4 mW/C -65C to +150C 125C -40C to +85C 260C Supply Voltage, VPP IN VCC VDD Logic Input Voltages Output Current (each Output) VPP OUT = 12V VPP OUT = VCC 15V 7.5V 7.5V -0.3V toVDD 600mA 250mA
Absolute Maximum Ratings
Power Dissipation, TAMBIENT 25C SOIC Derating Factors (To Ambient) SOIC Storage Temperature Operating Temperature (Die) Operating Temperature (Ambient) Lead Temperature (5 sec)
Logic Block Diagram
VDD
14
VPP IN
4
EN11
2
11 VDD VDD VPP IN 3
VCC1
EN01
12 VDD
VDD 1
VPP OUT1
HiZ/ LOW1
13 VDD
EN12
VPP IN
8 VDD VDD VPP IN 5
VCC2
EN02
9 VDD
VDD 7
VPP OUT2
HiZ/ LOW2
10 6
GND
1997
2-11
MIC2558
Micrel
(Over operating temperature range with VDD = VCC= 5V, VPP IN = 12 V unless otherwise specified.) Conditions Min Typ Max Units
Electrical Characteristics:
Symbol INPUT VIH VIL VIN (Max) IIN Logic 1 Input Voltage Logic 0 Input Voltage Input Voltage Range Input Current Parameter
2.2 0.8 -5 0 V < VIN < VDD VDD 1
V V V A
EACH OUTPUT VOL IOUT, Hi-Z Clamp Low Output Voltage High Impedance Output Leakage Current Clamp Low Output Resistance EN0 = EN1 = HiZ = 0, ISINK = 1.6mA EN0 = EN1 = 0, HiZ = 1. 0 VPP OUT 12V Resistance to Ground. ISINK = 2mA EN0 = EN1 = 0, HiZ = 0. IPP OUT = -10 mA (Sourcing) 1 0.4 10 V A
ROC
130
250
RO
Switch Resistance, VPP OUT = VCC Switch Resistance, VPP OUT = VPP IN
2.5
5
RO
IPP OUT = -100 mA (Sourcing)
0.5
1
SWITCHING TIME (See Figure 1) t1 t2 t3 t4 t5 t6 Delay + Rise Time Delay + Rise Time Delay + Fall Time Delay + Fall Time Output Turn-On Delay Output Turn-Off Delay VPP OUT = 0V to 5V (Notes 3, 5) VPP OUT = 5V to 12V (Notes 3, 5) VPP OUT = 12V to 5V (Notes 3, 5) VPP OUT = 5V to 0V (Notes 3, 5) VPP OUT = Hi-Z to 5V (Notes 4, 5) VPP OUT = 5V to Hi-Z (Notes 4, 5) 15 12 25 45 10 75 50 50 75 100 50 200 s s s s s ns
POWER SUPPLY IDD ICC IPP VDD Supply Current VCC Supply Current IPP Supply Current IPP OUT = 0 VPP OUT1 = VPPOUT2 = 0 V or VPP . IPPOUT = 0. VPP OUT1 = VPPOUT2 = VCC - - - 1 1 10 A A A A
20
80
2-12
1997
MIC2558
Micrel
Electrical Characteristics (continued)
Symbol Parameter Conditions Min Typ Max Units
POWER SUPPLY, continued VCC VDD VPP IN Operating Input Voltage Operating Input Voltage Operating Input Voltage 2.8 8.0 6 6 14.5 V V 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 = 2.9k and COUT = 0.1F on VPP OUT. RL = 2.9k. 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.
2
3V Hi-Z/Low 0 3V EN0 0 3V EN1 0 12V
VPP OUT
5V
0 t1 t2 t3 t4 t5 t6
Figure 1. Timing Diagram.
1997
2-13
MIC2558
Micrel
Applications Information
PCMCIA VPP1 and VPP2 control is easily accomplished using the MIC2558 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. 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 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. Supply Bypassing For best results, bypass VCC and VPP IN inputs with 1F capacitors. Both VPP OUT pins should have a 0.01F to 0.1F 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.
5V System Power 3.3V Supply 12V EN01 EN11 PCMCIA Card Slot A MIC2558
VPP IN VCC
5V System Power Supply 12V EN01 EN11 PCMCIA Card Slot A MIC2558
VPP IN VCC
VCC Switch
VCC
VPP1
EN02 EN12
VPP2
PCMCIA Card Slot Controller
VCC
EN01 EN11
VPP IN
VCC
VPP1 PCMCIA Card Slot B
MIC2558
VCC Select and Switch
VCC
EN02 EN12
VPP2
VPP1
Figure 3. MIC2558 Typical two slot PCMCIA application with single 5.0V VCC. 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 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 VPP IN to VPP OUT1 and/or VPP OUT2. The low ON resistance of the MIC2558 switch requires only a small bypass capacitor on the VPP OUT pins, with the main filtering 2-14 1997
EN02 EN12
VPP2
PCMCIA Card Slot Controller
VCC Select and Switch
VCC
EN01 EN11
VPP IN
VCC
VPP1 PCMCIA Card Slot B
MIC2558
EN02 EN12
VPP2
Figure 2. MIC2558 Typical two slot PCMCIA application with dual VCC (5.0V or 3.3V).
MIC2558
action performed by a large filter capacitor on VPP IN. The VPP OUT transition from VCC to 12.0V typically takes 25S. After programming is completed, the controller outputs a (0,1) to the MIC2558, 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 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, 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.
VPP IN +12V
Micrel
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 MIC2558 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.
VDD +5V
2
0.1F VPP OUT 1
2 14 13
0.1F 1F
3 12 MIC2558 4 11 5 6 7 10 9 8
Hi-Z/ Low 1 Control EN01 EN11 Hi-Z/ Low 2 Control EN02 EN12
VPP OUT 2
0.1F
8 +V IN SHUTDOWN 3 SD INPUT
OFF
ON
VIN = +5.3V to +15V VOUT 1
MIC2951
+
100pF GND 4 7 220k 1% 2N2222 FB
TTL Logic Level
300k 1%
3.3F
High (V > 1.5V) VCC = 5.0V 470 k Low (V < 0.5V) VCC = 3.3V
180k
1%
VCC Switching and Control Block
Figure 3. Full PCMCIA Implementation of VPP and VCC switching using MIC2558 and MIC2951 voltage regulator. 1997 2-15

▲Up To Search▲

Price & Availability of MIC2558

	To Download MIC2558 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .