MIC2566-0BTS Micrel Inc, MIC2566-0BTS Datasheet - Page 8

• Manufacturer Part Number: MIC2566-0BTS
• Description: IC PCMCIA/CARDBUS SGL 14-TSSOP
• Manufacturer: Micrel Inc
• Type: PCMCIA/Cardbus Switchr

Specifications of MIC2566-0BTS

• Number Of Outputs: 2
• Rds (on): 4 Ohm
• Internal Switch(s): Yes
• Current Limit: 400mA
• Voltage - Input: 3.3V, 5V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MIC2566
Applications Information
PC Card V
the MIC2566 PC Card/CardBus Slot V
Controller IC. Four control bits determine V
V
outputs of 3.3V and 5V at the maximum allowable PC Card
current are supported. V
or 5V), 0V or a high impedance state are available. When the
V
switches into “sleep” mode and draws only nanoamperes of
leakage current. An error flag alerts the user if the output
voltage is too low because of overtemperature or overcurrent
faults. Protection from hot switching is provided which pre-
vents feedback from the V
example) by locking out the low voltage switch until the initial
switch’s gate voltage drops below the desired lower V
The MIC2566 operates from the computer system main
power supply. Device logic and internal MOSFET drive is
generated internally by charge pump voltage multipliers
powered from V
trolled to prevent damage to sensitive loads and meet all PC
Card Specification speed requirements.
Supply Bypassing
External capacitors are not required for operation. The
MIC2566 is a switch and has no stability problems. For best
results however, bypass V
capacitors to improve output ripple. As all internal device logic
and comparison functions are powered from the V
the power supply quality of this line is the most important, and
a bypass capacitor may be necessary for some layouts. Both
V
tors for noise reduction and electrostatic discharge (ESD)
damage prevention. Larger values of output capacitors are
not necessary.
PC Card Slot Implementation
The MIC2566 is designed for PC Card applications, including
the CardBus option, that do not require a 12V bias. One
MIC2566 is required for each PC Card slot.
When a memory card is initially inserted, it should receive
V
determined by a combination of mechanical socket “keys”
and voltage sense pins. The card sends a handshaking data
MIC2566
PP OUT
CC
CC OUT
CC
— either 3.3V 0.3V or 5.0V 5%. The initial voltage is
clamped to ground condition is selected, the device
voltage and standby/operate mode condition. V
and V
CC
and V
PP OUT
CC3
PP
IN. Switching speeds are carefully con-
pins may use 0.01 F to 0.1 F capaci-
control is easily accomplished using
PP OUT
CC3
CC OUT
IN and V
output voltages of V
(from 5V to 3.3V, for
CC5
CC
IN inputs with 1 F
and V
CC OUT
CC3
PP
CC
IN line,
Power
(3.3V
CC
and
.
CC
8
stream to the controller, which then determines whether or
not this card requires V
V
level, the controller commands this change by disabling V
waiting at least 100ms, and then re-enabling the other V
voltage.
V
to immediately switch from one V
turning OFF and waiting 100ms first), enhancement of the
second switch begins after the first is OFF, realizing break-
before-make protection. V
and OFF quickly, which also prevents cross conduction.
If no card is inserted or the system is in sleep mode, the slot
logic controller outputs a (V
MIC2566, which shuts down V
into a high impedance output shutdown (sleep) mode, where
current consumption drops to nearly zero, with only tiny
CMOS leakage currents flowing.
Internal device control logic and MOSFET drive and bias
voltage is powered from V
generated by an internal charge pump quadrupler. Systems
without 3.3V may connect V
voltages are compatible with common PC Card logic control-
lers using either 3.3V or 5V supplies.
Figure 3 shows MIC2566 configuration for situations where
only a single +5V V
Output Current and Protection
MIC2566 output switches are capable of passing the maxi-
mum current needed by any PC Card. 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 MIC2566, the system power supplies, the card socket
pins, and the PC Card. A final protective feature is the error
FLAG, which signals the PC Card slot logic controller when
a fault condition exists, allowing the controller to notify the
user that the card inserted has a problem. The open-drain
FLAG monitors the voltage level on both V
V
below its programmed level or an overtemperature fault
exists.
This FLAG signals output voltage transitions as well as fault
conditions. Refer to Figures 1 and 2 for details.
CC
CC
PP OUT
. If the card is compatible with and desires a different V
switches are turned ON and OFF slowly. If commanded
and activates (pulls low) when either output is 1V
CC
PP
is available.
and if the card is designed for dual
PP
CC3
CC3
CC3
switches are turned ON slowly
CC
IN to 5V. Input logic threshold
IN. The high voltage bias is
. This also places the switch
IN, V
CC
CC5
to the other (without
IN) = (0,0) to the
CC OUT
May 2003
Micrel
and
CC
CC
CC
,