MIC2562A-1YTS Micrel Inc, MIC2562A-1YTS Datasheet - Page 8

• Manufacturer Part Number: MIC2562A-1YTS
• Description: IC PCMCIA/CARDBUS CTRLR 16-TSSOP
• Manufacturer: Micrel Inc
• Type: PCMCIA/Cardbus Switchr

Specifications of MIC2562A-1YTS

• Lead Free Status: Lead free
• Number Of Outputs: 2
• Rds (on): 150 mOhm
• Internal Switch(s): Yes
• Current Limit: 1.5A
• Voltage - Input: 3.3V, 5V, 12V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Other names: 576-1742-5; MIC2562A-1YTS

MIC2562A
Applications Information
PC Card V
the MIC2562A 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), V
When the V
device switches into “sleep” mode and draws only nano-
amperes 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 prevents feedback from the V
for example), by locking out the low-voltage switch until the
initial switch’s gate voltage drops below the desired lower
V
The MIC2562A operates from the computer system’s 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
MIC2562A is a switch and has no stability problems. For best
results however, bypass V
with 1 F capacitors to improve output ripple. As all internal
device logic and comparison functions are powered from the
V
important, and a bypass capacitor may be necessary for
some layouts. Both V
0.01 F to 0.1 F capacitors for noise reduction and electro-
static discharge (ESD) damage prevention. Larger values of
output capacitors are not necessary.
PC Card Slot Implementation
The MIC2562A is designed for full compatibility with the
PCMCIA PC Card Specification (March 1995), including the
CardBus option. One MIC2562A 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
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.
June 2004
PP
CC
CC3
CC
CC
CC
.
. If the card is compatible with and desires a different V
OUT voltage and standby/operate mode condition. V
switches are turned ON and OFF slowly. If commanded
(either 3.3V
IN line, the power supply quality of this line is the most
PP
CC
CC
, 0V, or a high impedance state are available.
and V
clamped to ground condition is selected, the
CC3
0.3V or 5.0V 5%). The initial voltage is
PP
IN. Switching speeds are carefully con-
CC
PP
control is easily accomplished using
PP
OUT and V
and if the card is designed for dual
CC3
PP
OUT output voltages of V
switches are turned ON slowly
IN, V
CC5
CC
CC
PP
OUT (from 5V to 3.3V,
to the other (without
IN, and V
OUT pins may use
CC
and V
CC
PP
OUT and
PP
IN inputs
CC
power
(3.3V
CC
CC
CC
CC
,
8
If no card is inserted or the system is in sleep mode, the slot
logic controller outputs a (V
MIC2562A, which shuts down V
switch 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, MOSFET drive and bias voltage
is powered from V
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.
The PC Card specification defines two V
card slot. The two V
different voltages. V
Flash memory cards. Implementing two independent V
voltages is easily accomplished with the MIC2562A and a
MIC2557 PCMCIA V
full configuration, supporting independent V
and 3.3V V
support multiple V
and the MIC2557 is not required. This circuit is shown in
Figure 4.
During flash memory programming with standard (+12V)
flash memories, the PC Card slot logic controller outputs a
(0,1) to the EN0, EN1 control pins of the MIC2562A, which
connects V
resistance of the MIC2562A switch allows using a small
bypass capacitor on the V
action performed by a large filter capacitor on V
the main power supply filter capacitor is sufficient). Using a
small-value capacitor such as 0.1 F on the output causes
little or no timing delays. The V
12.0V typically takes 250 s. After programming is com-
pleted, the controller outputs a (EN1, EN0) = (0,1) to the
MIC2562A, which then reduces V
Break-before-make switching action and controlled rise times
reduces switching transients and lowers maximum current
spikes through the switch.
Figure 5 shows MIC2562A configuration for situations where
only a single +5V V
Output Current and Protection
MIC2562A output switches are capable of passing the maxi-
mum current needed by any PC Card. The MIC2562A meets or
exceeds 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 MIC2562A,
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
either output is 1V 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
PP
OUT and V
CC
IN (nominally +12V) to V
operation. However, few logic controllers
CC3
PP
CC
PP
PP
PP
— most systems connect V
IN. The high voltage bias is generated
CC3
is available.
PP
switching matrix. Figure 3 shows this
supply pins may be programmed to
is primarily used for programming
PP
OUT and activates (pulls low) when
IN to 5V. Input logic threshold
CC3
OUT pins, with the main filtering
PP
IN, V
OUT transition from V
CC
PP
. This also places the
OUT to the V
CC5
PP
PP
IN) = (0,0) to the
OUT. The low on
PP
supply pins per
and both 5.0V
PP
M9999-062204
PP1
IN (usually
CC
to V
Micrel
level.
CC
PP2
PP
to