MAX1601 Datasheet, PDF (9/16 Pages) Maxim Integrated Products – Dual-Channel CardBus and PCMCIA Power Switches with SMBus™ Serial Interface

Dual-Channel CardBus and PCMCIA
Power Switches with SMBus™ Serial Interface
______________________________________________________________Pin Description
PIN
1, 25
2, 3,
26, 27
4
5
6, 8, 10
7, 22, 24
9, 18, 20
11
12
13
14
15
16
17
19, 21, 23
28
NAME
GND
N.C.
12INA
VPPA
VX
VCCA
VCCB
VPPB
12INB
ADR
SMBSUS
SMBCLK
SMBDATA
SMBALERT
VY
VL
Ground
FUNCTION
No internal connection
+12V Supply Voltage Input, internally connects to channel A VPP switch. Tie to VPPA if not used.
Channel A VPP Output
VX Supply-Voltage Inputs. VX pins must be connected together. Input range is 3V to 5.5V. VX is
normally connected to 5V.
Channel A VCC Outputs
Channel B VCC Outputs
Channel B VPP Output
+12V Supply Voltage Input, internally connects to channel B VPP switch. Tie to VPPB if not used.
Address Input, sets SMBus address location. See Table 1 for address selection.
SMBus Suspend-Mode Control Input. The device will execute commands previously stored in
the normal-mode register if SMBSUS is high, or will execute commands previously stored in the
suspend-mode register if SMBSUS is low.
SMBus Clock Input
SMBus Data Input/Output, open drain
Fault-Detection Interrupt Output. SMBALERT goes low if either channel VCC or VPP switch is
current limiting or undervoltage lockout, or if the thermal protection circuit is activated.
SMBALERT is an open-drain output that requires an external pull-up resistor.
VY Supply-Voltage Inputs. VY pins must be connected together. Input range is 3V to 5.5V. VY is
normally connected to 3V.
Logic Supply-Voltage Inputs. Connect to the +3.3V or +5V host system supply. VL can be sup-
plied via the output of a CMOS-logic gate to produce an overriding shutdown. When used as a
shutdown input, VL should have a 1kΩ series resistor with a 0.1µF capacitor to ground (Figure 2).
Note that VL must be greater than undervoltage lockout for any switches to be turned on.
_______________________________________________________________________________________ 9