Page 1
MIC2563A Micrel
MIC2563A
Dual Slot PCMCIA/CardBus Power Controller
Preliminary Information
General Description
The MIC2563A Dual Slot PCMCIA (Personal Computer
Memory Card International Association) and CardBus Power
Controller handles all PC Card slot power supply pins, both
VCC and VPP. The MIC2563A switches between the three V
voltages (0V, 3.3V and 5.0V) and the VPP voltages (OFF, 0V,
3.3V, 5V, or 12.0V) required by PC Cards. The MIC2563A
switches voltages from the system power supply to VCC and
VPP. Output voltage is selected by two digital inputs each and
output current ranges up to 1A for VCC and 250mA for VPP.
The MIC2563A provides power management capability controlled by the PC Card logic controller. Voltage rise and fall
times are well controlled. Medium current VPP and high
current VCC output switches are self-biasing:
no +12V supply
is required for 3.3V or 5V output.
The MIC2563A is designed for efficient operation. In standby
(sleep) mode the device draws very little quiescent current,
typically 0.3µA. The device and PCMCIA port is protected by
current limiting and overtemperature shutdown. Full crossconduction lockout protects the system power supplies.
The MIC2563A is an improved version of the MIC2563,
offering lower ON-resistances and a VCC pulldown clamp in
the OFF mode. It is available in a 28-pin SSOP.
CC
Applications
• Dual Slot PC Card Power Supply Pin Voltage Switch
• CardBus Slot Power Supply Control
• 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
• Single Package Controls Two PC Card Slots
• High Efficiency, Low Resistance Switches Require No
12V Bias Supply
• No External Components Required
• Output Current Limit and Overtemperature Shutdown
• Ultra Low Power Consumption
• Complete Dual Slot PC Card/CardBus VCC and V
Switch Matrix in a Single Package
• Logic Compatible with Industry Standard PC Card Logic
Controllers
• No Voltage Shoot-Through or Switching Transients
• Break-Before-Make Switching
• Digital Selection of VCC and VPP Voltages
• Over 1A VCC Output Current for Each Section
• Over 250mA VPP Output Current for Each Section
• 28-Pin SSOP Package
PP
2
Ordering Information
Part Number Temperature Range Package
MIC2563A-0BSM –40°C to +85°C 28-pin SSOP
MIC2563A-1BSM –40°C to +85°C 28-pin SSOP
Note: see the logic table inside for a description of the differences
between the logic options
1997 2-47
T ypical Application
5V
(opt)
System
3.3V
Power
Supply
12V
(opt)
PCMCIA
Card Slot
Controller
VPPIN
(opt)
EN0
EN1
V
CC5_EN
V
CC3_EN
MIC2563
EN0
EN1
V
CC5_EN
V
CC3_EN
V
IN
V
IN
CC3
CC5
V
V
V
V
V
V
PP1
PP2
CC
PP1
PP2
CC
PCMCIA
Card Slot
A
PCMCIA
PCMCIA
Card Slot
Card Slot
B
Page 2
MIC2563A Micrel
B V
CC5_EN
B V
CC3_EN
V
CC3
IN
B EN1
GND
B V
PP OUT
B V
CC OUT
B V
PP
IN
(optional)
B EN0
V
CC5
IN
MIC2563
Section B
Control
Logic
I
Limit
/ Thermal
Shut Down
Gate Drive
Generator
A V
CC5_EN
A V
CC3_EN
A V
CC3
IN
A EN1
A V
PP OUT
A V
CC OUT
A V
PP
IN
(optional)
A EN0
A V
CC5
IN
MIC2563
Section A
Control
Logic
I
Limit
/ Thermal
Shut Down
Gate Drive
Generator
Absolute Maximum Ratings (Notes 1 and 2)
Power Dissipation, T
AMBIENT
≤ 25°C ......
Internally Limited
SSOP.............................................................. 800 mW
Derating Factors (To Ambient)
SSOP............................................................. 4 mW/°C
Storage Temperature .............................. –65°C to +150°C
Operating Temperature (Die) ................................... 125°C
Lead Temperature (5 sec)........................................ 260°C
Supply Voltage, V
V
IN ................................................................ 7.5V
CC3
V
IN ................................................................ 7.5V
CC5
......................................................
PP IN
Logic Input Voltages.....................................–0.3V to +10V
Output Current (each Output)
V
PP OUT
V
CC OUT
............................
>200mA, Internally Limited
......................................
>1A, Internally Limited
15V
Pin Configuration
A V
A V
A V
A V
A V
B VPP OUT
B V
B V
B V
Connect all pins with the same name together for
IN
CC5
OUT
CC
IN
CC5
GND
CC5_EN
CC3_EN
A EN0
A EN1
B VPP IN
NC
OUT
CC
IN
CC3
OUT
CC
28
AV
2
3
4
5
6
7
8
9
10
11
12
13
14
27
26
25
24
23
22
21
20
19
18
17
16
15
A V
A V
NC
A VPP OUT
A VPP IN
B EN1
B EN0
B V
B V
GND
B V
B V
B V
28 Pin SSOP Package
proper operation.
CC
CC3
CC
CC3_EN
CC5_EN
CC5
CC
CC5
OUT
IN
OUT
IN
OUT
IN
Logic Block Diagram
MIC2563A-1 Redefined Pin Assignment
Function Pin Number
Slot A Slot B
VPP_VCC 7 21
VPP_PGM 8 22
Some pin names for the MIC2563A-1 are different from the
MIC2563A-0. This table shows the differences. All other pin
names are identical to the MIC2563A-0 as shown in the Pin
Configuration, above.
2-48 1997
Page 3
MIC2563A Micrel
Electrical Characteristics:
(Over operating temperature range with V
CC3 IN
= 3.3V, V
IN = 5.0V, VPP IN = 12V, unless
CC5
otherwise specified.)
Symbol Parameter Conditions Min Typ Max Units
DIGITAL INPUTS
V
IH
V
IL
I
IN
Logic 1 Input Voltage 2.2 7.5 V
Logic 0 Input Voltage –0.3 0.8 V
Input Current 0 V < VIN < 5.5V ±1 µA
VPP OUTPUT
I
PP OUT
Hi-Z Leakage Current 0 ≤ V
I
PPSC
R
O
High Impedance Output Shutdown Mode 1 10 µA
PP OUT
Short Circuit Current Limit V
PP OUT
Switch Resistance Select V
Select V
I
PP OUT
≤ 12V
= 0 0.2 0.3 A
PP OUT
PP OUT
= 5V 1.8 2.5 Ω
= 3.3V 3.3 5
= –100mA (Sourcing)
2
R
O
R
O
Switch Resistance, V
Select V
PP OUT
= 12V I
Switch Resistance, Select V
Select V
PP OUT
= 0V I
VPP SWITCHING TIME (See Figure 1)
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
14
t
15
t
16
Output Turn-ON Delay V
(Note 3) V
Output Rise Time V
(Note 3) V
Output Transition Timing V
(Note 3) V
Output Turn-Off Delay Time V
(Notes 3, 5) V
= 12V 0.6 1 Ω
PP IN
PP OUT
PP OUT
V
V
V
V
V
= –100 mA (Sourcing)
PP OUT
= 50µA (Sinking)
PP OUT
PP OUT
PP OUT
PP OUT
PP OUT
PP OUT
PP OUT
PP OUT
PP OUT
PP OUT
PP OUT
PP OUT
PP OUT
= clamped to ground 2500 3900 Ω
= Hi-Z to 10% of 3.3V 5 50 µs
= Hi-Z to 10% of 5V 10 50
= Hi-Z to 10% of 12V 70 250
= 10% to 90% of 3.3V 100 200 800 µs
= 10% to 90% of 5V 100 300 1000
= 10% to 90% of 12V 100 225 800
= 3.3V to 90% of 12V 100 250 1000 µs
= 5V to 90% of 12V 100 200 800
= 12V to 90% of 3.3V 100 200 800
= 12V to 90% of 5V 100 350 1200
= 3.3V to Hi-Z 200 1000 ns
= 5V to Hi-Z 200 1000
= 12V to Hi-Z 200 1000
t
11
t
12
t
13
Output Turn-OFF Fall Time V
(Note 3) V
PP OUT
PP OUT
V
PP OUT
= 90% to 10% of 3.3V 50 1000 ns
= 90% to 10% of 5V 50 1000
= 90% to 10% of 12V 300 2000
1997 2-49
Page 4
MIC2563A Micrel
Electrical Characteristics (continued)
Symbol Parameter Conditions Min Typ Max Units
VCC OUTPUT
I
CCSC
R
O
Short Circuit Current Limit V
Switch Resistance Select V
VCC SWITCHING TIME (See Figure 2)
t
1
t
2
t
3
Output Turn ON Delay Time V
(Note 4) V
Output Rise Time V
(Note 4)
t
4
t
7
Output Turn-Off Delay V
(Notes 4, 5)
t
8
CC OUT
I
CC OUT
Select V
I
CC OUT
Select V
I
CC OUT
CC OUT
CC OUT
CC OUT
V
CC OUT
CC OUT
V
CC OUT
= 0 1 1.5 A
CC OUT
= 3.3V 100 150 mΩ
= –1A (Sourcing)
CC OUT
= 5V 70 100 mΩ
= –1A (Sourcing)
CC OUT
= clamped to ground 500 3900 Ω
= 0.1mA (Sinking)
= 0V to 10% of 3.3V 300 1500 µs
= 0V to 10% of 5.0V 750 3000
= 10% to 90% of 3.3V 200 700 2500 µs
= 10% to 90% of 5V 200 1500 6000
= 3.3V 2.4 8 ms
= 5V 2.8 8
t
5
Output Fall Time V
(Note 4)
t
6
POWER SUPPLY
I
CC5
I
CC3
V
CC5 IN
V
CC3 IN
(Note 6) V
I
IN V
PP
PP IN
(Note 7) V
V
CC5
V
CC3
V
PP IN
Operating Input Voltage (5V) V
Operating Input Voltage (3.3V) (Note 6) 3.0 3.3 6 V
Operating Input Voltage (12V) V
Supply Current (5V) V
Supply Current (3.3V) V
Supply Current (12V) V
CC OUT
V
CC OUT
CC OUT
V
CC OUT
CC OUT
CC OUT
PP OUT
PP OUT
CC5 IN
PP IN
= 90% to 10% of 3.3V 100 240 1000 µs
= 90% to 10% of 5.0V 100 600 2000
= 5V or 3.3V, I
CC OUT
= 0 8 50 µA
= 0V (Sleep Mode) 0.2 10
= 5V or 3.3V, I
CC OUT
= 0 40 100 µA
= 0V (Sleep Mode) 0.1 10
= 3.3V or 5V. I
= Hi-Z, 0 or V
PP OUT
PP
= 0 0.3 4 µA
0.3 4
not required for operation — 5.0 6 V
not required for operation — 12.0 14.5 V
(Note 8)
2-50 1997
Page 5
MIC2563A Micrel
Electrical Characteristics (continued)
Symbol Parameter Conditions Min Typ Max Units
THERMAL SHUTDOWN
T
SD
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: RL = 100Ω connected to ground.
NOTE 4: RL = 10Ω connected to ground.
NOTE 5: Delay from commanding Hi Z or 0V to beginning slope. Does not apply to current limit or overtemperature shutdown
NOTE 6: The MIC2563A uses V
NOTE 7:V
NOTE 8: V
Thermal Shutdown Temperature 130 °C
prevent damage from static discharge.
conditions.
for operation. For single 5V supply systems, connect 5V to both V
tions Information for further details.
is not required for operation.
PP IN
must be either high impedance or greater than or approximately equal to the highest voltage VCC in the system. For
PP IN
example, if both 3.3V and 5V are connected to the MIC2563A, V
CC3 IN
must be either 5V, 12V, or high impedance.
PP IN
CC3 IN
and V
. See Applica-
CC5IN
2
AB CD
V
PP
Enable
0
12V
V
PP
Output
5V
3.3V
0
VPP to 3.3V
t
4
t
1
EF G JH
VPP to 5VVPP to 3.3VVPP to 12V
V
PP
OFF
t
7
t
9
t
14
t
2
t
11
t
5
VPP to 12V
t
8
VPP to 5V
t
10
VPP OFF
t
15
VPP to 12V VPP OFF
t
6
t
3
t
12
K
t
13
t
16
Figure 1. MIC2563A VPP Timing Diagram. VPP Enable is shown generically: refer to the timing tables (below). At
time “A” VPP = 3.3V is selected. At B, VPP is set to 12V. At C, VPP = 3.3V (from 12V). At D, VPP is disabled. At E, VPP is
programmed to 5V. At F, VPP is set to 12V. At G, VPP is programmed to 5V. At H, VPP is disabled. At J, VPP is set to
12V. And at K, VPP is again disabled. RL = 100Ω for all measurements. Load capacitance is negligible.
1997 2-51
Page 6
MIC2563A Micrel
ABC D
V
CC
Enable
0
VCC to 3.3V VCC to 5VVCC OFF VCC OFF
t
2
t
4
t
8
t
6
5V
3.3V
V
CC
Output
0
t
1
t
3
t
7
t
5
Figure 2. MIC2563A VCC Timing Diagram. VCC Enable is shown generically: refer to the timing tables (below) for
specific control logic input. At time A, VCC is programmed to 3.3V. At B, VCC is disabled. At C, VCC is programmed
to 5V. And at D, VCC is disabled. RL = 10Ω
MIC2563A-0 Control Logic Table
V
CC5_EN
0000Clamped to Ground High Z
0001Clamped to Ground High Z
0010Clamped to Ground High Z
0011Clamped to Ground Clamped to Ground
0100 3.3 High Z
0101 3.3 3.3
0110 3.3 12
0111 3.3Clamped to Ground
1000 5 High Z
1001 5 5
1010 5 12
1011 5Clamped to Ground
1100 3.3 High Z
1101 3.3 3.3
1110 3.3 5
1111 3.3Clamped to Ground
V
CC3_EN
EN1 EN0 V
CC OUT
V
PP OUT
2-52 1997
Page 7
MIC2563A Micrel
MIC2563A-1 Control Logic (compatible with Cirrus Logic CL-PD6710 & PD672x-series
Controllers)
V
CC5_EN
V
CC3_EN
0000Clamped to Ground Clamped to Ground
0001Clamped to Ground High Z
0010Clamped to Ground High Z
0011Clamped to Ground High Z
0100 5Clamped to Ground
0101 5 5
0110 5 12
0111 5 High Z
1000 3.3Clamped to Ground
1001 3.3 3.3
1010 3.3 12
1011 3.3 High Z
1100Clamped to Ground Clamped to Ground
1101Clamped to Ground High Z
1110Clamped to Ground High Z
1111Clamped to Ground High Z
V
PP_PGM
V
PP_VCC
V
CC OUT
V
PP OUT
2
MIC2563A-2 Logic (Compatible with Databook Controllers)
Pin 5 Pin 6 Pin 7 Pins 2 & 14 Pin 13
V
CCSEL0(1)VPPSEL0(1)VCCSEL2(3)
0 1 0 Clamped to Ground Clamped to Ground
1 1 0 3.3V 3.3V
0 0 0 3.3V 12V
1 0 0 3.3V Clamped to Ground
0 1 1 Clamped to Ground Clamped to Ground
1 1 1 5V 5V
001 5V 12V
1 0 1 5V Clamped to Ground
The Databook DB86184 PCMCIA controller requires two 100kΩ pull-down resistors from pins 5 and 7 to
ground and a 100kΩ pull-up resistor from pin 6 to +3.3V (or +5V). Connect MIC2560-2 pin 8 to ground.
V
CC OUT
V
PP OUT
1997 2-53
Page 8
MIC2563A Micrel
Applications Information
PC Card power control for two sockets is easily accomplished using the MIC2563A PC Card/CardBus Slot VCC &
VPP Power Controller IC. Four control bits per socket determine V
mode condition. VCC outputs of 3.3V and 5V at the maximum
CC OUT
allowable PC Card current are supported. V
voltages of V
state are available. When the VCC clamped to ground condi-
and V
PP OUT
(3.3V or 5V), VPP, 0V, or a high impedance
CC
voltage and standby/operate
PP OUT
output
tion is selected, the device switches into “sleep” mode and
draws only nanoamperes of leakage current. Full protection
from hot switching is provided which prevents feedback from
the V
CC OUT
low voltage switch until the initial switch’s gate voltage drops
(from 5V to 3.3V, for example) by locking out the
below the desired lower VCC.
The MIC2563A 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
CC3 IN
. Switching speeds are carefully con-
Card Specification timing requirements.
Supply Bypassing
External capacitors are not required for operation. The
MIC2563A is a switch and has no stability problems. For best
results however, bypass V
inputs with 1µF capacitors to improve output ripple. As all
CC3
IN, V
CC5
IN, and V
PP
internal device logic and comparison functions are powered
from the V
the most important, and a bypass capacitor may be necessary for some layouts. Both V
use 0.01µF to 0.1µF capacitors for noise reduction and
IN line, the power supply quality of this line is
CC3
CC OUT
and V
PP OUT
pins may
electrostatic discharge (ESD) damage prevention.
PC Card Slot Implementation
The MIC2563A is designed for full compatibility with the
Personal Computer Memory Card International Association’s (PCMCIA) PC Card Specification, (March 1995), including the CardBus option.
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 V
level, the controller commands this change by disabling VCC,
waiting at least 100ms, and then re-enabling the other V
voltage.
CC
CC
VCC switches are turned ON and OFF slowly. If commanded
to immediately switch from one VCC to the other (without
turning OFF and waiting 100ms first), enhancement of the
second switch begins after the first is OFF, realizing breakbefore-make protection. VPP switches are turned ON slowly
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
MIC2563A, which shuts down VCC. This also places the
CC3
IN, V
IN) = (0,0) to the
CC5
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 and MOSFET drive and bias
voltage is powered from V
generated by an internal charge pump quadrupler. Systems
without 3.3V may connect V
old voltages are compatible with common PC Card logic
IN. The high voltage bias is
CC3
IN to 5V. Input logic thresh-
CC3
controllers using either 3.3V or 5V supplies.
The PC Card Specification defines two VPP supply pins per
card slot. The two VPP supply pins may be programmed to
different voltages. VPP is primarily used for programming
FLASH memory cards. Implementing two independent V
voltages is easily accomplished with the MIC2563A and a
MIC2557 PCMCIA VPP Switching Matrix. Figure 3 shows this
full configuration, supporting independent VPP and both 5.0V
and 3.3V VCC operation. However, few logic controllers
support multiple VPP—most systems connect V
and the MIC2557 is not required. This circuit is shown in
Figure 4.
IN
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 MIC2563A, which
connects VPP IN (nominally +12V) to V
resistance of the MIC2563A switch allows using a small
bypass capacitor on the V
action performed by a large filter capacitor on VPP IN (usually
PP OUT
PP OUT
pins, with the main filtering
the main power supply filter capacitor is sufficient). Using a
small-value capacitor such as 0.1µF on the output causes
little or no timing delays. The V
12.0V typically takes 250µs. After programming is com-
PP OUT
transition from VCC to
pleted, the controller outputs a (EN1, EN0) = (0,1) to the
MIC2563A, which then reduces V
Break-before-make switching action and controlled rise times
PP OUT
to the VCC level.
reduces switching transients and lowers maximum current
spikes through the switch.
Figure 5 shows MIC2563A configuration for situations where
only a single +5V VCC is available.
Output Current and Protection
MIC2563A output switches are capable of passing the maximum current needed by any PC Card. The MIC2563A 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 MIC2563A, the system power supplies, the card socket
pins, and the PC Card.
PP
to V
PP1
PP2
. The low ON
2-54 1997
Page 9
MIC2563A Micrel
5V
(opt)
System
3.3V
Power
Supply
12V
(opt)
VPPIN
(opt)
EN0
EN1
V
CC5_EN
V
CC3_EN
V
IN
V
CC3
CC5
IN
V
PP1
PCMCIA
V
PP2
Card Slot
A
V
CC
MIC2563
PCMCIA
Card Slot
Controller
EN0
EN1
V
CC5_EN
V
CC3_EN
EN0
EN1
V
PP1
PCMCIA
V
PCMCIA
PP2
Card Slot
Card Slot
B
V
CC
MIC2558
EN0
EN1
Figure 3. PC Card slot power control application with
dual VCC (5.0V or 3.3V) and separate V
PP1
and V
PP2
.
5V
(opt)
System
3.3V
Power
Supply
12V
PCMCIA
Card Slot
Controller
(opt)
VPPIN
(opt)
A EN0
A EN1
A V
A V
B EN0
B EN1
B V
B V
V
CC3
CC5_EN
CC3_EN
MIC2563
CC5_EN
CC3_EN
IN
V
IN
V
CC5
(opt)
PP1
PCMCIA
V
PP2
Card Slot
A
V
CC
V
PP1
PCMCIA
V
PCMCIA
PP2
Card Slot
Card Slot
B
V
CC
Figure 4. Typical PC Card slot power control application
with dual VCC (5.0V or 3.3V). Note that V
PP1
and V
PP2
are
driven together.
2
5V
System
Power
Supply
12V
(opt)
PCMCIA
Card Slot
Controller
VPPIN
(opt)
A EN0
A EN1
A V
A V
B EN0
B EN1
B V
B V
V
IN
CC3
CC5_EN
CC3_EN
MIC2563
CC5_EN
CC3_EN
V
IN
CC5
V
V
V
V
V
V
PP1
PP2
CC
PP1
PP2
CC
PCMCIA
Card Slot
A
PCMCIA
PCMCIA
Card Slot
Card Slot
B
Figure 5. PC Card slot power control application without a 3.3V VCC supply. Note that V
together. The MIC2563A is powered from the V
line. In this configuration, V
CC3 IN
will be 5V when either V
CC OUT
is enabled.
CC3 IN
and V
lines are driven
CC5 IN
CC3
or V
CC5
1997 2-55
Page 10
MIC2563A Micrel
RST#
SER_DATA
SER_CLK
2
3
4
5
6
7
8
9
11
V
CC
20
DQ
D
Q
D
Q
DQ
D
Q
DQ
D
Q
DQ
74x574
74x175
1 CLR
19
18
17
16
15
14
13
12
10
1
4
57
12 10
13 15
4
57
12 10
13 15
1 CLR
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
74x175
9 CLK
2
2
9 CLK
A_VPP_PGM (Pin 8)
A_VPP_VCC (Pin 7)
A_VCC5_EN (Pin 5)
A_VCC3_EN (Pin 6)
B_VPP_PGM (Pin 22)
B_VPP_VCC (Pin 21)
B_VCC3_EN (Pin 19)
B_VCC5_EN (Pin 20)
SER_LATCH
Figure 6. Interfacing the MIC2563A with a serial-output data controller. Pinouts shown are for the MIC2563A-1
and a three-wire serial controller.
Serial Control
Serial Control Adapter P.C. Board Layout
Figure 6 shows conversion from a three-wire serial interface,
such as used by the Cirrus Logic CL-PD6730, to the standard
eight-line parallel interface used by the MIC2563A-1. This
interface requires three common, low cost 7400-series logic
ICs:
• 74x574 Octal D Flip-Flop
• 74x175 Quad Flip-Flop with Latches (two needed)
Either 3.3V or 5V logic devices may be used, depending upon
the control voltage employed by the slot logic controller. Pin
numbers in parenthesis refer to the MIC2563A-1BSM.
Gerber™ files for this P.C. board layout are available to Micrel
customers. Please contact Micrel directly.
Another serial-to-parallel solution for this application is the
74HC594, 8-bit shift register with output registers. This device contains the eight D flip-flops plus has latched outputs
suitable for this purpose.
Component Key
U1 ............. MIC2563
U2, U3 ...... 74x175
U4 ............. 74x574
2-56 1997
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