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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
____________________________Features
©
Supports Two CardBus Sockets
©
1A, 0.08
½
Max VY VCC Switch (MAX1601 only)
1A, 0.14
½
Max VX VCC Switch
©
Soft Switching for Low Inrush Surge Current
©
Overcurrent Protection
©
Overcurrent/Thermal-Fault Flag Output
©
Thermal Shutdown at T j = +150°C
©
Independent Internal Charge Pumps
©
Break-Before-Make Switching Action
©
10µA Max Standby Supply Current
©
5V and 12V Not Required for Low-R DS(ON) 3.3V
Switching
©
Complies with PCMCIA 3V/5V Switching
Specifications
©
Super-Small, 28-Pin SSOP Package
(0.2in. or 5mm wide)
©
System Management Bus (SMBus) Serial
Interface
_______________Ordering Information
PART
MAX1601 EAI
MAX1604 EAI
TEMP. RANGE
PIN-PACKAGE
28 SSOP
28 SSOP
-40°C to +85°C
-40°C to +85°C
__________Simplified Block Diagram
VPPA
12IN
).The
MAX1601/MAX1604 fit two complete CardBus/PCMCIA
switches into a space-saving, narrow (0.2in. or 5mm
wide) SSOP package.
½
VY
VCCA
VY
VX
VX
VCCA
________________________Applications
Desktop Computers
VCCA
VL
MAX1601/MAX1604
Data Loggers
VDD
OVERCURRENT
AND
THERMAL
SHUTDOWN
DECODE
LOGIC
Notebook Computers
Digital Cameras
SMBALERT
SMBCLK
SMBDATA
SMBSUS
Docking Stations
Printers
ADDRESS
SELECT
ADR
GND
Handy-Terminals
PCMCIA Read/Write Drives
VPPB
12IN
Pin Configuration appears on last page.
VCCB
VY
VCCB
VX
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
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Dual-Channel CardBus and PCMCIA
Power Switches with SMBus™ Serial Interface
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 Characteristicstable.
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
CONDITIONS
MIN
TYP
MAX
UNITS
POWER-SUPPLY SECTION
VX, VY or VL
12INA, 12INB
3.0
5.5
Input Voltage Range
V
11
13
VL falling edge
2.4
2.5
2.8
12IN falling edge
1.8
3.0
Undervoltage Lockout Threshold
V
12IN rising edge
VX, VY falling edge
5
8
10
1.4
2.5
2.8
VX or VY, all switches 0V or high-Z,
control inputs = 0V or VL, T A = +25°C
Standby Supply Current
1
µA
Any combination of VY switches on,
control inputs = 0V or VL, no VCC loads
VY Quiescent Supply Current
20
100
µA
Any combination of VX switches on,
control inputs = 0V or high-Z, no VCC loads
VX Quiescent Supply Current
20
100
µA
12INA tied to 12INB, all switches 0V or high-Z,
control inputs = 0V or VL, T A = +25°C
12IN_ Standby Supply Current
1
µA
12INA tied to 12INB, VPPA and VPPB 12V switches on,
control inputs = 0V or VL, no VPP loads
12IN_ Quiescent Supply Current
15
100
µA
All switches 0V or high-Z, control inputs = 0V or VL,
T A = +25°C
VL Standby Supply Current
4
10
µA
VL Quiescent Supply Current
Any combination of switches on
25
150
µA
VL Fall Rate
When using VL as shutdown pin (Note 3)
0.05
V/µs
VCC SWITCHES
Operating Output Current Range
VCCA or VCCB, VX = VY = 3V to 5.5V
0
1
A
12INA = 12INB = 0V to 13V,
VY = 3V, VX = 0V to 5.5V,
I SWITCH = 1A, T A = +25°C
MAX1601
0.06
0.08
On-Resistance, VY Switches
½
MAX1604
0.14
0.24
12INA = 12INB = 0V to 13V, VX = 4.5V, VY = 0V to 5.5V,
I SWITCH = 1A, T A = +25°C
On-Resistance, VX Switches
0.10
0.14
½
2
_______________________________________________________________________________________
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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
CONDITIONS
MIN
TYP
MAX
UNITS
Output Current Limit
VCCA or VCCB
1.2
4.0
A
Output Sink Current
VCCA or VCCB < 0.4V, programmed to 0V state
20
mA
VCCA or VCCB forced to 0V, high-Z state,
T A = +25°C
Output Leakage Current
10
µA
Output Propagation Delay
Plus Rise Time
VCCA or VCCB, 0V to VX or VY, C L = 30µF,
R L = 25
2
10
ms
½
, 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
Output Rise Time
100
1200
µs
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
Output Propagation Delay
Plus Fall Time
60
100
ms
VCCA or VCCB, VX or VY to 0V, C L = 1µF,
R L = 25
Output Fall Time
6
ms
, 90% to 10% points
½
VPP SWITCHES
Operating Output Current Range
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
0
120
mA
On-Resistance, 12V Switches
0.70
1
½
On-Resistance, VPP = VCC Switches
1
3
½
Output Current Limit
VPPA or VPPB, programmed to 12V
130
200
260
mA
Output Sink Current
VPPA or VPPB < 0.4V, programmed to 0V state
10
mA
VPPA or VPPB forced to 0V, high-Z state,
T A = +25°C
Output Leakage Current
10
µA
Output Propagation Delay
Plus Rise Time
VPPA or VPPB, 0V to 12IN_, C L = 0.1µF,
50% of input to 90% of output, T A = +25°C
1.2
30
ms
VPPA or VPPB, 0V to 12IN_, C L = 0.1µF,
10% to 90% points, T A = +25°C
Output Rise Time
100
800
m
s
Output Propagation Delay
Plus Fall Time
VPPA or VPPB, 12IN_ to 0V, C L = 0.1µF,
50% of input to 10% of output, T A = +25°C
9
60
ms
VPPA or VPPB, 12IN_ to 0V, C L = 0.1µF,
90% to 10% points
Output Fall Time
1
ms
INTERFACE AND LOGIC SECTION
SMBALERT Signal Propagation
Delay
VCC_ or VPP_, load step to SMBALERT output,
50% point to 50% point (Note 3)
3
µs
SMBALERT Output Low Voltage
I SINK = 1mA, low state
0.4
V
SMBALERT Output Leakage Current
V SMBALERT = 5.5V, high state
-0.1
0.1
µA
Thermal Shutdown Threshold
Hysteresis = +20°C (Note 4)
150
°C
Logic Input Low Voltage
SMBSUS, SMBCLK, SMBDATA
0.8
V
Logic Input High Voltage
SMBSUS, SMBCLK, SMBDATA
2.2
V
Logic Output Low Voltage
SMBDATA, I SINK = 4mA
0.4
V
_______________________________________________________________________________________
3
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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
CONDITIONS
MIN
TYP
MAX
UNITS
SMB Input Capacitance
5
pF
SMBSUS, SMBCLK, SMBDATA
SMBus spec = 10kHz min
SMBCLK Clock Frequency
DC
100
kHz
SMBCLK Clock Low Time
t LOW 10% to 10% points
4.7
µs
SMBCLK Clock High Time
t HIGH 90% to 90% points
4
µs
SMB Repeated Start-Condition
Setup Time
t SU:STA 90% to 90% points
250
ns
SMB Start-Condition Hold Time
t HD:STA 10% of SMBDATA to 90% of SMBCLK
4
µs
SMB Stop-Condition Setup Time
t SU:STO 90% of SMBCLK to 10% of SMBDATA
4
µs
SMB Data Valid to SMBCLK Rising-
Edge Time
t SU:DAT 10% or 90% of SMBDATA to
10% of SMBCLK
t HD:DAT (Note 5)
500
ns
SMB Data Hold Time
0
ns
Bus Free Time
t BUF between start and stop conditions
4.7
µs
ADR Input Low Voltage
0.6
V
ADR Input High Voltage
1.5
V
Logic Input Bias Current
ADR, SMBSUS, SMBCLK, SMBDATA
-1
1
µA
SCL Fall to SDA Valid
(Master Clocking-In Data)
100
1000
ns
Start-Condition Setup
4.7
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
_______________________________________________________________________________________
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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
CONDITIONS
MIN
TYP
MAX
UNITS
POWER-SUPPLY SECTION
VX, VY or VL
3.0
5.5
Input Voltage Range
V
12INA, 12INB
11
13
VL falling edge, hysteresis = 1%
2.3
2.9
12IN falling edge
1.8
Undervoltage Lockout Threshold
V
12IN rising edge
5
10
VX, VY falling edge
1.4
2.9
VX or VY, all switches 0V or high-Z,
control inputs = 0V or VL
Standby Supply Current
15
µA
Any combination of VY switches on,
control inputs = 0V or VL, no VCC loads
VY Quiescent Supply Current
100
µA
Any combination of VX switches on,
control inputs = 0V or high-Z, no VCC loads
VX Quiescent Supply Current
100
µA
12INA tied to 12INB, all switches 0V or high-Z,
control inputs = 0V or VL
12IN_ Standby Supply Current
15
µA
12INA tied to 12INB, VPPA and VPPB 12V switches on,
control inputs = 0V or VL, no VPP loads
12IN_ Quiescent Supply Current
100
µA
VL Standby Supply Current
All switches 0V or high-Z, control inputs = 0V or VL
15
µA
VL Quiescent Supply Current
Any combination of switches on
150
µA
INTERFACE AND LOGIC SECTION
SMBALERT Output Low Voltage
I SINK = 1mA, low state
0.4
V
Logic Input Low Voltage
SMBCLK, SMBDATA, SMBSUS
0.8
V
V
Logic Input High Voltage
SMBCLK, SMBDATA, SMBSUS
2.2
V
Logic Output Low Voltage
SMBDATA, I SINK = 4mA
0.4
V
ADR Input Low Voltage
0.6
ADR Input High Voltage
1.5
V
_______________________________________________________________________________________
5
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