19-1085; Rev 1; 10/96
Dual-Channel CardBus and PCMCIA
Power Switches with SMBus™ Serial Interface
________________General Description
The MAX1601/MAX1604 DC power-switching ICs con-
tain a network of low-resistance MOSFET switches that
deliver selectable VCC and VPP voltages to two
CardBus or PC Card host sockets. Key features include
ultra-low-resistance switches, small packaging, soft-
switching action, and compliance with PCMCIA specifi-
cations for 3V/5V switching. 3.3V-only power switching
for fast, 32-bit CardBus applications is supported in two
ways: stiff, low-resistance 3.3V switches allow high 3.3V
load currents (up to 1A); and completely independent
internal charge pumps let the 3.3V switch operate nor-
mally, even if the +5V and +12V supplies are discon-
nected or turned off to conserve power. The internal
charge pumps are regulating types that draw reduced
input current when the VCC switches are static. Also,
power consumption is automatically reduced to 10µA
max when the switches are programmed to high-Z or
GND states over the serial interface, unlike other solu-
tions that may require a separate shutdown-control
input.
Other key features include guaranteed specifications for
output current limit level, and guaranteed specifications
for output rise/fall times (in compliance with PCMCIA
specifications). Reliability is enhanced by thermal-over-
load protection, accurate current limiting, an overcur-
rent-fault flag output, undervoltage lockout, and extra
ESD protection at the VCC/VPP outputs. The SMBus ser-
ial interface is flexible, and can tolerate logic input levels
in excess of the positive supply rail.
The MAX1604 and MAX1601 are identical, except
for the MAX1604’s VY switch, which has roughly three-
times the on-resistance (typically 140m
Ω).The
MAX1601/MAX1604 fit two complete CardBus/PCMCIA
switches into a space-saving, narrow (0.2in. or 5mm
wide) SSOP package.
____________________________Features
o
Supports Two CardBus Sockets
o
1A, 0.08Ω Max VY VCC Switch (MAX1601 only)
1A, 0.14Ω Max VX VCC Switch
o
Soft Switching for Low Inrush Surge Current
o
Overcurrent Protection
o
Overcurrent/Thermal-Fault Flag Output
o
Thermal Shutdown at T
j
= +150°C
o
Independent Internal Charge Pumps
o
Break-Before-Make Switching Action
o
10µA Max Standby Supply Current
o
5V and 12V Not Required for Low-R
DS(ON)
3.3V
Switching
o
Complies with PCMCIA 3V/5V Switching
Specifications
o
Super-Small, 28-Pin SSOP Package
(0.2in. or 5mm wide)
o
System Management Bus (SMBus) Serial
Interface
MAX1601/MAX1604
_______________Ordering Information
PART
MAX1601EAI
MAX1604EAI
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
__________Simplified Block Diagram
12IN
VY
VY
VX
VX
VL
VDD
SMBCLK
SMBDATA
SMBSUS
GND
12IN
DECODE
LOGIC
ADDRESS
SELECT
OVERCURRENT
AND
THERMAL
SHUTDOWN
SMBALERT
ADR
VPPB
VCCA
VCCA
VCCA
VPPA
________________________Applications
Desktop Computers
Notebook Computers
Docking Stations
Handy-Terminals
Data Loggers
Digital Cameras
Printers
PCMCIA Read/Write Drives
MAX1601/MAX1604
Pin Configuration appears on last page.
VY
VX
VCCB
VCCB
VCCB
SMBus is a trademark of Intel Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Dual-Channel CardBus and PCMCIA
Power Switches with SMBus™ Serial Interface
MAX1601/MAX1604
ABSOLUTE MAXIMUM RATINGS
Inputs/Outputs to GND
(VL, VX, VY, VCCA, VCCB) (Note 1)........................-0.3V, +6V
VPP Inputs/Outputs to GND
(12INA, 12INB, VPPA, VPPB) (Note 1) ..................-0.3V, +15V
Inputs and Outputs to GND (SMBCLK, SMBDATA,
SMBSUS,
SMBALERT)
(Note 1) ..............................-0.3V, +6V
ADR Input to GND ...........................................-0.3V, (VL + 0.3V)
VCCA, VCCB Output Current (Note 2).....................................4A
VPPA, VPPB Output Current (Note 2) ...............................250mA
VCCA, VCCB Short Circuit to GND ............................Continuous
VPPA, VPPB Short Circuit to GND..............................Continuous
Continuous Power Dissipation (T
A
= +70°C)
SSOP (derate 9.52mW/°C above +70°C) ....................762mW
Operating Temperature Range
MAX1601EAI/MAX1604EAI .............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1:
There are no parasitic diodes between any of these pins, so there are no power-up sequencing restrictions (for example,
logic input signals can be applied even if all of the supply voltage inputs are grounded).
Note 2:
VCC and VPP outputs are internally current-limited to safe values. See the
Electrical Characteristics
table.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VL = VY = 3.3V, VX = 5V, 12INA = 12INB = 12V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
POWER-SUPPLY SECTION
Input Voltage Range
VX, VY or VL
12INA, 12INB
VL falling edge
12IN falling edge
12IN rising edge
VX, VY falling edge
Standby Supply Current
VY Quiescent Supply Current
VX Quiescent Supply Current
12IN_ Standby Supply Current
12IN_ Quiescent Supply Current
VL Standby Supply Current
VL Quiescent Supply Current
VL Fall Rate
VCC SWITCHES
Operating Output Current Range
On-Resistance, VY Switches
VCCA or VCCB, VX = VY = 3V to 5.5V
12INA = 12INB = 0V to 13V,
VY = 3V, VX = 0V to 5.5V,
I
SWITCH
= 1A, T
A
= +25°C
MAX1601
MAX1604
0
0.06
0.14
0.10
1
0.08
0.24
0.14
Ω
A
Ω
VX or VY, all switches 0V or high-Z,
control inputs = 0V or VL, T
A
= +25°C
Any combination of VY switches on,
control inputs = 0V or VL, no VCC loads
Any combination of VX switches on,
control inputs = 0V or high-Z, no VCC loads
12INA tied to 12INB, all switches 0V or high-Z,
control inputs = 0V or VL, T
A
= +25°C
12INA tied to 12INB, VPPA and VPPB 12V switches on,
control inputs = 0V or VL, no VPP loads
All switches 0V or high-Z, control inputs = 0V or VL,
T
A
= +25°C
Any combination of switches on
When using VL as shutdown pin (Note 3)
15
4
25
20
20
3.0
11
2.4
1.8
5
1.4
5.5
13
2.8
10
2.8
1
100
100
1
100
10
150
0.05
µA
µA
µA
µA
µA
µA
µA
V/µs
V
CONDITIONS
MIN
TYP
MAX
UNITS
2.5
3.0
8
2.5
Undervoltage Lockout Threshold
V
On-Resistance, VX Switches
12INA = 12INB = 0V to 13V, VX = 4.5V, VY = 0V to 5.5V,
I
SWITCH
= 1A, T
A
= +25°C
2
_______________________________________________________________________________________
Dual-Channel CardBus and PCMCIA
Power Switches with SMBus™ Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(VL = VY = 3.3V, VX = 5V, 12INA = 12INB = 12V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Output Current Limit
Output Sink Current
Output Leakage Current
Output Propagation Delay
Plus Rise Time
Output Rise Time
Output Propagation Delay
Plus Fall Time
Output Fall Time
VPP SWITCHES
Operating Output Current Range
On-Resistance, 12V Switches
On-Resistance, VPP = VCC Switches
Output Current Limit
Output Sink Current
Output Leakage Current
Output Propagation Delay
Plus Rise Time
Output Rise Time
Output Propagation Delay
Plus Fall Time
Output Fall Time
INTERFACE AND LOGIC SECTION
SMBALERT
Signal Propagation
Delay
SMBALERT
Output Low Voltage
SMBALERT
Output Leakage Current
Thermal Shutdown Threshold
Logic Input Low Voltage
Logic Input High Voltage
Logic Output Low Voltage
VCC_ or VPP_, load step to
SMBALERT
output,
50% point to 50% point (Note 3)
I
SINK
= 1mA, low state
V
SMBALERT
= 5.5V, high state
Hysteresis = +20°C (Note 4)
SMBSUS,
SMBCLK, SMBDATA
SMBSUS,
SMBCLK, SMBDATA
SMBDATA, I
SINK
= 4mA
2.2
0.4
-0.1
150
0.8
3
0.4
0.1
µs
V
µA
°C
V
V
V
VPPA or VPPB
12IN = 11.6V, I
SWITCH
= 100mA, T
A
= +25°C
Programmed to VX (5V) or VY (3.3V), T
A
= +25°C
VPPA or VPPB, programmed to 12V
VPPA or VPPB < 0.4V, programmed to 0V state
VPPA or VPPB forced to 0V, high-Z state,
T
A
= +25°C
VPPA or VPPB, 0V to 12IN_, C
L
= 0.1µF,
50% of input to 90% of output, T
A
= +25°C
VPPA or VPPB, 0V to 12IN_, C
L
= 0.1µF,
10% to 90% points, T
A
= +25°C
VPPA or VPPB, 12IN_ to 0V, C
L
= 0.1µF,
50% of input to 10% of output, T
A
= +25°C
VPPA or VPPB, 12IN_ to 0V, C
L
= 0.1µF,
90% to 10% points
100
1.2
800
9
1
60
130
10
10
30
0
0.70
1
200
120
1
3
260
mA
Ω
Ω
mA
mA
µA
ms
µs
ms
ms
VCCA or VCCB
VCCA or VCCB < 0.4V, programmed to 0V state
VCCA or VCCB forced to 0V, high-Z state,
T
A
= +25°C
VCCA or VCCB, 0V to VX or VY, C
L
= 30µF,
R
L
= 25Ω, 50% of input to 90% of output, T
A
= +25°C
VCCA or VCCB, 0V to VX or VY, C
L
= 1µF,
R
L
= open circuit, 10% to 90% points, T
A
= +25°C
VCCA or VCCB, VX or VY to 0V, C
L
= 30µF,
R
L
= open circuit, 50% of input to 10% of output,
T
A
= +25°C
VCCA or VCCB, VX or VY to 0V, C
L
= 1µF,
R
L
= 25Ω, 90% to 10% points
100
2
1200
CONDITIONS
MIN
1.2
20
10
10
TYP
MAX
4.0
UNITS
A
mA
µA
ms
µs
MAX1601/MAX1604
60
100
ms
6
ms
_______________________________________________________________________________________
3
Dual-Channel CardBus and PCMCIA
Power Switches with SMBus™ Serial Interface
MAX1601/MAX1604
ELECTRICAL CHARACTERISTICS (continued)
(VL = VY = 3.3V, VX = 5V, 12INA = 12INB = 12V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SMB Input Capacitance
SMBCLK Clock Frequency
SMBCLK Clock Low Time
SMBCLK Clock High Time
SMB Repeated Start-Condition
Setup Time
SMB Start-Condition Hold Time
SMB Stop-Condition Setup Time
SMB Data Valid to SMBCLK Rising-
Edge Time
SMB Data Hold Time
Bus Free Time
ADR Input Low Voltage
ADR Input High Voltage
Logic Input Bias Current
SCL Fall to SDA Valid
(Master Clocking-In Data)
Start-Condition Setup
4.7
ADR,
SMBSUS,
SMBCLK, SMBDATA
1.5
-1
100
1
1000
CONDITIONS
SMBSUS,
SMBCLK, SMBDATA
SMBus spec = 10kHz min
t
LOW
10% to 10% points
t
HIGH
90% to 90% points
t
SU:STA
90% to 90% points
t
HD:STA
10% of SMBDATA to 90% of SMBCLK
t
SU:STO
90% of SMBCLK to 10% of SMBDATA
t
SU:DAT
10% or 90% of SMBDATA to
10% of SMBCLK
t
HD:DAT
(Note 5)
t
BUF
between start and stop conditions
DC
4.7
4
250
4
4
500
0
4.7
0.6
MIN
TYP
5
100
MAX
UNITS
pF
kHz
µs
µs
ns
µs
µs
ns
ns
µs
V
V
µA
ns
µs
Note 3:
Not production tested.
Note 4:
Thermal limit not active in standby state (all switches programmed to GND or high-Z state).
Note 5:
A transition must internally provide at least a hold time in order to bridge the undefined region (300ns max) of the falling
edge of SMBCLK.
4
_______________________________________________________________________________________
Dual-Channel CardBus and PCMCIA
Power Switches with SMBus™ Serial Interface
ELECTRICAL CHARACTERISTICS
(VL = VY = 3.3V, VX = 5V, 12INA = 12INB = 12V, T
A
= -40°C to +85°C, unless otherwise noted.)
PARAMETER
POWER-SUPPLY SECTION
Input Voltage Range
VX, VY or VL
12INA, 12INB
VL falling edge, hysteresis = 1%
12IN falling edge
12IN rising edge
VX, VY falling edge
Standby Supply Current
VY Quiescent Supply Current
VX Quiescent Supply Current
12IN_ Standby Supply Current
12IN_ Quiescent Supply Current
VL Standby Supply Current
VL Quiescent Supply Current
SMBALERT
Output Low Voltage
Logic Input Low Voltage
Logic Input High Voltage
Logic Output Low Voltage
ADR Input Low Voltage
ADR Input High Voltage
1.5
VX or VY, all switches 0V or high-Z,
control inputs = 0V or VL
Any combination of VY switches on,
control inputs = 0V or VL, no VCC loads
Any combination of VX switches on,
control inputs = 0V or high-Z, no VCC loads
12INA tied to 12INB, all switches 0V or high-Z,
control inputs = 0V or VL
12INA tied to 12INB, VPPA and VPPB 12V switches on,
control inputs = 0V or VL, no VPP loads
All switches 0V or high-Z, control inputs = 0V or VL
Any combination of switches on
I
SINK
= 1mA, low state
SMBCLK, SMBDATA,
SMBSUS
SMBCLK, SMBDATA,
SMBSUS
SMBDATA, I
SINK
= 4mA
2.2
0.4
0.6
3.0
11
2.3
1.8
5
1.4
10
2.9
15
100
100
15
100
15
150
0.4
0.8
µA
µA
µA
µA
µA
µA
µA
V
V
5.5
13
2.9
V
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1601/MAX1604
Undervoltage Lockout Threshold
V
INTERFACE AND LOGIC SECTION
V
V
V
V
_______________________________________________________________________________________
5
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