PDF MAX1604EAI Data sheet ( Hoja de datos )

Número de pieza	MAX1604EAI
Descripción	Dual-Channel CardBus and PCMCIA Power Switches with SMBus Serial Interface
Fabricantes	Maxim Integrated
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No Preview Available ! 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 140mΩ).The MAX1601/MAX1604 fit two complete CardBus/PCMCIA switches into a space-saving, narrow (0.2in. or 5mm wide) SSOP package. ________________________Applications Desktop Computers Data Loggers Notebook Computers Digital Cameras Docking Stations Printers Handy-Terminals PCMCIA Read/Write Drives Pin Configuration appears on last page. SMBus is a trademark of Intel Corp. ____________________________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 Tj = +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-RDS(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 _______________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 SMBCLK SMBDATA SMBSUS GND 12IN VY VX MAX1601/MAX1604 VDD DECODE LOGIC ADDRESS SELECT OVERCURRENT AND THERMAL SHUTDOWN VPPA VCCA VCCA VCCA SMBALERT ADR VPPB VCCB VCCB VCCB ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 1 page Dual-Channel CardBus and PCMCIA Power Switches with SMBus™ Serial Interface ELECTRICAL CHARACTERISTICS (VL = VY = 3.3V, VX = 5V, 12INA = 12INB = 12V, TA = -40°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS POWER-SUPPLY SECTION Input Voltage Range VX, VY or VL 12INA, 12INB VL falling edge, hysteresis = 1% 12IN falling edge Undervoltage Lockout Threshold 12IN rising edge VX, VY falling edge Standby Supply Current VX or VY, all switches 0V or high-Z, control inputs = 0V or VL MIN TYP MAX UNITS 3.0 5.5 V 11 13 2.3 2.9 1.8 V 5 10 1.4 2.9 15 µA VY Quiescent Supply Current Any combination of VY switches on, control inputs = 0V or VL, no VCC loads 100 µA VX Quiescent Supply Current Any combination of VX switches on, control inputs = 0V or high-Z, no VCC loads 100 µA 12IN_ Standby Supply Current 12INA tied to 12INB, all switches 0V or high-Z, control inputs = 0V or VL 15 µA 12IN_ Quiescent Supply Current 12INA tied to 12INB, VPPA and VPPB 12V switches on, control inputs = 0V or VL, no VPP loads 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 INTERFACE AND LOGIC SECTION SMBALERT Output Low Voltage ISINK = 1mA, low state Logic Input Low Voltage SMBCLK, SMBDATA, SMBSUS Logic Input High Voltage SMBCLK, SMBDATA, SMBSUS Logic Output Low Voltage SMBDATA, ISINK = 4mA ADR Input Low Voltage ADR Input High Voltage 150 µA 0.4 V 0.8 V 2.2 V 0.4 V 0.6 V 1.5 V _______________________________________________________________________________________ 5 5 Page Dual-Channel CardBus and PCMCIA Power Switches with SMBus™ Serial Interface _______________Detailed Description The MAX1601/MAX1604 power-switching ICs contain a network of low-resistance MOSFET switches that deliver selectable VCC and VPP voltages to two Cardbus or PC Card host sockets. The MAX1601/MAX1604 differ only in the VY switch on-resistance. Figure 1 is the detailed block diagram. The power-input pins (VY, VX, 12IN_) are completely independent. Low inrush current is guaranteed by con- trolled switch rise times. VCC’s 100µs minimum output rise time is 100% tested with a 1µF capacitive load, and VPP’s 1ms minimum rise time is guaranteed with a 0.1µF load. These respective capacitive loads are chosen as worst-case card-insertion parameters. The internal switching control allows VCC and VPP rise times to be controlled, and makes them nearly independent of resis- tive and capacitive loads (see rise-time photos in the Typical Operating Characteristics). Fall times are a function of loading, and are compensated by internal circuitry. Power savings is automatic: internal charge pumps draw very low current when the VCC switches are static. Standby mode reduces switch supply current to 1µA. Driving the VL pin low with an external logic gate (master shutdown) reduces total supply current to1µA (Figure 2). Operating Modes The MAX1601/MAX1604 have three operating modes: normal, standby, and shutdown. Normal mode supplies the selected outputs with their appropriate supply volt- ages. Standby mode places all switches at ground, high impedance, or a combination of the two. Shutdown mode turns all switches off, and puts the VCC and VPP outputs into a high-impedance state. Pull VL low to enter shutdown mode. To ensure a 0.05V/µs fall rate on VL, use a 1kΩ series resistor and a 0.1µF capacitor to ground (Figure 2). Overcurrent Protection Peak detecting circuitry protects both the VCC and VPP switches against overcurrent conditions. When current through any switch exceeds the internal current limit (4A for VCC switches and 200mA for VPP switch- es), the switch turns off briefly, then turns on again at the controlled rise rate. If the overcurrent condition lasts more than 2µs, the SMBALERT output latches MASTER SHUTDOWN 74HC04 1k 0.1µF 3.3V VY VPPA VL VCCA MAX1601 MAX1604 VPPB VCCB TO SOCKETS A AND B Figure 2. Master Shutdown Circuit low. A continuous short-circuit condition results in a pulsed output current until thermal shutdown is reached. SMBALERT is open-drain and requires an external pull-up resistor. Thermal Shutdown If the IC junction temperature rises above +150°C, the thermal shutdown circuitry opens all switches, including the GND switches, and SMBALERT is pulled low. When the temperature falls below +130°C, the switches turn on again at the controlled rise rate. If the overcurrent condition remains, the part cycles between thermal shutdown and overcurrent. Undervoltage Lockout If the VX or VY switch input voltage drops below 1.5V, the associated switch turns off and SMBALERT goes low. For example, if VY is 3.3V and VX is 0V, and if the interface controller selects VY, the VCCA output will be 3.3V. If VX is selected, VCCA changes to a high-imped- ance output and SMBALERT goes low. When a voltage is initially applied to 12IN_, it must be greater than 8V to allow the switch to operate. Operation continues until the voltage falls below 2V (the VPP output is high impedance). When VL drops to less than 2.3V, all switches are turned off and the VCC and VPP outputs are high impedance. ______________________________________________________________________________________ 11 11 Page

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