G570 GMT | Alldatasheet
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Technical content
Features
Fully Integrated V CC and V pp Switching for Dual Slot PC CardTM Interface 3-Lead Serial Interface Compatible With CardBus TM Controllers 3.3V Low Voltage Mode Meets PC Card Standards RESET for System Initialization of PC Cards 12V Supply Can Be Disabled Except During 12V Flash Programming Short Circuit and Thermal Protection 28 Pin and 30 Pin SSOP Compatible With 3.3V, 5V and 12V PC Cards Low RDS(on) (225-mΩΩΩΩ 5V V CC Switch; 200 mΩΩΩΩ 3.3V VCC Switch) Break-Before-Make Switching Internal power-On Reset Application Notebook PC Electronic Dictionary Personal Digital Assistance Digital still Camera
Description
The G570 PC Card power-interface switch provides an integrated power-management solution for two PC Cards. All of the discrete power MOSFETs, a logic section, current limiting, and thermal protection for PC Card control are combined on a single integrated cir- cuit (IC). The circuit allows the distribution of 3.3V, 5V, and/or 12V card power by means of the Serial inter- face. The current-limiting feature eliminates the need for fuses, which reduces component count and im- proves reliability. The G570 features a 3.3V low voltage mode that allows for 3.3V switching without the need for 5V supply. This facilitates low power system designs such as sleep mode and pager mode where only 3.3V is available. The G570 incorporates a reset function, selectable by one of two inputs, to help alleviate system errors. The reset function enables PC card initialization concurrent with host platform initialization, allowing a system reset. Reset is accomplished by grounding the V CC and V PP (flash-memory programming voltage) outputs, which discharges residual card voltage. End equipment for the G570 includes notebook com- puters, desktop computers, personal digital assistants (PDAs), digital cameras and bar-code scanners
Ordering Information
PART NUMBER TEMP. RANGE PACKAGE G570S4 -40°C to +85°C 28 SSOP G570SA -40°C to +85°C 30 SSOP Pin Information NC NC NC 12V BVPP BVCC BVCC BVCC NC OC 3.3V 3.3V DATA CLOCK LATCH RESET 12V AVPP AVCC AVCC AVCC GND NC RESET 3.3V G570 28Pin SSOP 2 NC NC NC 12V BVPP BVCC BVCC BVCC NC OC 3.3V 3.3V DATA CLOCK LATCH RESET 12V AVPP AVCC AVCC AVCC GND NC RESET 3.3V G570 30Pin SSOP 1615 25V NC NC
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. Absolute maximum ratings over operating free-air temperature (unless otherwise noted)* Input voltage range for card power: Output current (each card): Operating virtual junction temperature range, TJ Operating free-air temperature range, TA Storage temperature range, T STG….…...-55°C to 150°C *Stresses beyond those listed under "absolute maximum ratings”may cause permanent damage to the device. These are stress rating only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operati ng conditions”is not implied. Exposure to absolute–maximum-rated conditions for extended periods may affect device reliability. Recommended Operating Conditions Min Max Unit VI (5V) 0 5.25 V VI (3.3V) 0 5.25 V Input voltage range, VI VI (12V) 0 13.5 V IO (xVCC) at 25°C 1 A Output current IO (xVPP) at 25°C 150 mA Clock frequency 0 2.5 MHz Operating virtual junction temperature, TJ -40 125 °C Typical PC Card Power-Distribution Application Supervisor PCMCIA Controller 12V 3.3V G570 12V 3.3V RESET RESET Serial Interface OC AVPP VPP1 VPP2 VCC VCC PC Card A VPP1 VPP2 VCC VCC PC Card B AVCC AVCC AVCC BVPP BVCC BVCC BVCC Power Supply
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. Terminal Functions
28 Pin
NAME NO. I/O DESCRIPTION 3.3V 14,15,16 I 3.3V V CC input for card power 5V 1,27,28 I 5V V CC input for card power and/or chip power 12V 6,23 I 12V V PP input for card power AVCC 8,9,10 O Switched output that delivers 0V,3.3V,5V or high impedance to card AVPP 7 O Switched output that delivers 0V,3.3V,5V,12V or high impedance to card BVCC 19,20,21 O Switched output that delivers 0V, 3.3V, 5V or high impedance BVPP 22 O Switch output that delivers 0V, 3.3V, 5V, 12V or high impedance CLOCK 3 I Logic-level clock for serial data word DATA 2 I Logic-level serial data word GND 11 Ground LATCH 4 I Logic level latch for serial data word NC 12,18,24,25,26 No internal connection OC 17 O Logic-level overcurrent. OC reports output that goes low when an overcurrent condition exists RESET 5 I Logic-level RESET input active high. Do not connect if terminal 13 is used. RESET 13 I Logic-level RESET input active low. Do not connect if terminal 5 is used.
30 Pin
NAME NO. I/O DESCRIPTION 3.3V 15,16,17 I 3.3V V CC input for card power 5V 1,2,30 I 5V V CC input for card power and/or chip power 12V 7,24 I 12V V PP input for card power AVCC 9,10,11 O Switched output that delivers 0V,3.3V,5V or high impedance to card AVPP 8 O Switched output that delivers 0V,3.3V,5V,12V or high impedance to card BVCC 20,21,22 O Switched output that delivers 0V, 3.3V, 5V or high impedance BVPP 23 O Switch output that delivers 0V, 3.3V, 5V, 12V or high impedance CLOCK 4 I Logic level clock for serial data word DATA 3 I Logic level serial data word GND 12 Ground LATCH 5 I Logic level latch for serial data word NC 13,19,25,26, 27,28,29 No internal connection OC 18 O Logic-level overcurrent. OC reports output that goes low when an overcurrent condition exists RESET 6 I Logic-level RESET input active high. Do not connect if terminal 14 is used. RESET 14 I Logic-level RESET input active low. Do not connect if terminal 6 is used.
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. Electrical Characteristics (TA = 25°C, VI(5V) = 5V; unless otherwise noted) DC Characteristics PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 5V to x VCC 170 225 3.3V to x VCC V I(5V) = 5V, VI(3.3V) =3.3V 140 200 3.3V to x VCC V I(5V) = 0V, VI(3.3V) =3.3V 150 200 mΩ 5V to x VPP 6 3.3V to x VPP 6 Switch resistance* 12V to x VPP 6 Ω VO(xVPP) Clamp low voltage I PP at 10mA 0.8 V VO(xVCC) Clamp low voltage I CC at 10mA 0.8 V IPP high impedance State T A = 25°C 1 10 IIKG Leakage current ICC high-impedance State T A = 25°C 1 10 µA VI(5V) = 5V V O(AVCC) = VO(BVCC) = 5V VO(AVPP) = VO(BVPP) = 12V 115 150 VI(5V) = 0V VI(3.3V) = 3.3V VO(AVCC) = VO(BVCC) = 3.3V VO(AVPP) = VO(BVPP) = 0V 131 150 II Input current Shutdown mode V O(BVCC) = VO(AVCC) =VO(AVPP) = VO(BVPP) = Hi-Z 2 µA IO(xVCC) 0.8 2.2 A IOS Short-circuit Output current Limit IO(xVPP) Output powered up into a short to GND 120 400 mA *Pulse-testing techniques are used to maintain junction temperature close to ambient temperatures; thermal effects must be taken into account separately. Logic Section PARAMETER TEST CONDITION MIN MAX UNIT Logic input current 1 µA Logic input high level 2 V Logic input low level 0.8 V VI(5V) = 5V, IO = 1mA VI(5V)－0.4 Logic output high level VI(5V) = 0V, IO = 1mA VI(3.3V)= 3.3V VI(3.3V)－0.4 V Logic output low level I O = 1mA 0.4 V Switching Characteristics *, ** PARAMETER TEST CONDITION MIN TYP MAX UNIT VO (xVCC) 2 tr Output rise time VO (xVPP) 10 VO (xVCC) 16 tf Output fall time VO (xVPP) 45 ms ton 7 ms LATCH↑to VO(xVPP) toff 30 ms ton 5 ms LATCH↑to VO(xVCC) (3.3V), VI(5V) = 5V toff 16 ms ton 3.2 ms LATCH↑to VO(xVCC) (5V) toff 25 ms ton 6 ms tpd Propagation delay (see Figure 1) LATCH↑to VO(xVCC) (3.3V), VI(5V) = 0V toff 21 ms * Refer to Parameter Measurement Information **Switching Characteristics are with CL = 147µF
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. Switching Characteristics Switching Characteristics
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. Switching Characteristics
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc.
Application Information
PC Cards were initially introduced as a means to add EEPROM (flash memory) to portable computers with limited on-board memory. The idea of add-in cards quickly took hold; modems, wireless LANs, Global Positioning Satellite (GPS), multimedia, and hard-disk versions were soon available. As the number of PC Card applications grew, the engineering community quickly recognized the need for a standard to ensure compatibility across platforms. To this end, the PCMCIA was established, comprised of members from leading computer, software, PC Card, and semiconductor manufactures. One key goal was to realize the “plug-and play” concept. Cards and hosts from different vendors should be compatible —able to communicate with one another transparently. PC Card Power Specification System compatibility also means power compatibility. The most current set of specifications (PC Card Stan- dard) set forth by the PCMCIA committee states that power is to be transferred between the host and the card through eight of the 68 terminals of the PC Card connector. This power interface consists of two V CC, two V PP, and four ground terminals. Multiple V CC and ground terminals minimize connector-terminal and line resistance. The two V PP terminals were originally specified as separate signals but are commonly tied together in the host to form a single node to minimize voltage losses. Card primary power is supplied through the V CC terminals; flash-memory programming and erase voltage is supplied through the V PP termi- nals. Overcurrent and Over-Temperature Protection PC Cards are inherently subject to damage that can result from mishandling. Host systems require protec- tion against short-circuited cards that could lead to power supply or PCB-trace damage. Even systems robust enough to withstand a short circuit would still undergo rapid battery discharge into the damaged PC Card, resulting in the rather sudden and unacceptable loss of system power. Most hosts include fuses for protection. However, the reliability of fused systems is poor, as blown fuses require troubleshooting and re- pair, usually by the manufacturer. The G570 takes a two-pronged approach to overcur- rent protection. First, instead of fuses, sense FETs monitor each of the power outputs. Excessive current generates an error signal that linearly limits the output current, preventing host damage or failure. Sense FETs, unlike sense resistors or polyfuses, have an added advantage in that they do not add to the series resistance of the switch and thus produce no addi- tional voltage losses. Second, when an overcurrent condition is detected, the G570 asserts a signal at OC that can be monitored by the microprocessor to initiate diagnostics and/or send the user a warning message. In the event that an overcurrent condition persists, causing the IC to exceed its maximum junction temperature, thermal-protection circuitry activates, shutting down all power outputs until the device cools to within a safe operating region. 12V Supply Not Required Most PC Card switches use the externally supplied 12V V PP power for switch-gate drive and other chip functions, which requires that power be present at all times. The G570 offers considerable power savings by using an internal charge pump to generate the re- quired higher voltages from 5V or 3.3V input; therefore, the external 12V supply can be disable except when needed for flash-memory functions, thereby extending battery lifetime. Do not ground the 12V input if the 12V input is not used. Additional power savings are real- ized by the G570 during a software shutdown in which quiescent current drops to a typical of 2µA. 3.3V Low Voltage Mode The G570 operates in 3.3V low voltage mode when 3.3V is the only available input voltage (V I(5V)=0).This allows host and PC Cards to be operated in low power 3.3V only modes such as sleep modes or pager modes. Note that in this operation mode, the G570 derives its bias current from the 3.3V input pin and only 3.3V can be delivered to the Card. The 3.3V switch resistance increases, but the added switch re- sistance should not be critical, because only a small amount of current is delivered in this mode. Voltage Transitioning Requirement PC Cards, like portables, are migrating from 5V to 3.3V to minimize power consumption, optimize board space, and increase logic speeds. The G570 is de- signed to meet all combinations of power delivery as currently defined in the PCMCIA standard. The latest protocol accommodates mixed 3.3V/5V systems by first powering the card with 5V, then polling it to de- termine its 3.3V compatibility. The PCMCIA specifica- tion requires that the capacitors on 3.3V compatible cards be discharged to below 0.8 V before applying 3.3V power. This ensures that sensitive 3.3V circuitry is not subjected to any residual 5V charge and func- tions as a power reset. The G570 offer a selectable V CC and VPP ground state, in accordance with PCMCIA 3.3V/5V switching specifications, to fully discharge the card capacitors while switching between V CC voltage.
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. Output Ground Switches Several PCMCIA power distribution switches on the market do not have an active grounding FET switch. These devices do not meet the PC Card specification requiring a discharge of V CC within 100ms. PC Card resistance can not be relied on to provide a discharge path for voltages stored on PC Card capacitance be- cause of possible high impedance isolation by power management schemes. A method commonly shown to alleviate this problem is to add to the switch output an external 100kΩ resistor in parallel with the PC Card. Considering that this is the only discharge path to ground, a timing analysis show that the RC time con- stant delays the required discharge time to more than 2 seconds. The only way to ensure timing compatibility with PC Card standards is to use a power-distribution switch that has an internal ground switch, like that of the G570, or add an external ground FET to each of the output lines with the control logic necessary to se- lect it. In summary, the G570 is a complete single-chip dual-slot PC Card power interface. It meets all cur- rently defined PCMCIA specifications for power deliv- ery in 5V, 3.3V, and mixed systems, and offers a serial control interface. The G570 offers functionality, power savings, overcurrent and thermal protection, and fault reporting in one 30 pin SSOP surface-mount package for maximum value added to new portable designs. Power Supply Considerations The G570 has multiple pins for each of its 3.3V, 5V, and 12V power inputs and for switched V CC outputs. Any individual pin can conduct the rated input or out- put current. Unless all pins are connected in parallel, the series resistance is significantly higher than that specified, resulting in increased voltage drops and lost power. Both 12V inputs must be connected for proper V PP switching; it is recommended that all input and output power pins be paralleled for optimum operation. Although the G570 is fairly immune to power input fluctuations and noise, it is generally considered good design practice to bypass power supplies typically with a 1µF electrolytic or tantalum capacitor paralleled by a 0.047µF to 0.1µF ceramic capacitor. It is strongly re- commended that the switched V CC and VPP outputs be bypassed with a 0.1µF or larger capacitor; doing so improves the immunity of the G570 to electrostatic discharge (ESD). Care should be taken to minimize the inductance of PCB traces between the G570 and the load. High switching currents can produce large negative-voltage transients, which forward biases substrate diodes, resulting in unpredictable perform- ance. Similarly, no pin should be taken below –0.3V. RESET or RESET Inputs To ensure that cards are in a known state after power brownouts or system initialization, the PC Cards should be reset at the same time as the host by ap- plying a low impedance to the V CC and V PP terminals. A low impedance output state allows discharging of residual voltage remaining on PC Card filter capaci- tance, permitting the system (host and PC Cards) to be powered up concurrently. The RESET or RESET input closes internal switches S1, S4, S7, and S10 with all other switches left open (see G570 control logic table). The G570 remains in the low impedance output state until the signal is deasserted and further data is clocked in and latched. RESET or RESET is provided for direct compatibility with systems that use either an active-low or active-high reset voltage super- visor. The unused pin is internally pulled up or down and should be left unconnected. Overcurrent and Thermal Protection The G570 uses sense FETs to check for overcurrent conditions in each of the V CC and V PP outputs. Unlike sense resistors or polyfuses, these FETs do not add to the series resistance of the switch; therefore, voltage and power losses are reduced. Overcurrent sensing is applied to each output separately. When an overcur- rent condition is detected, only the power output af- fected is limited; all other power outputs continue to function normally. The OC indicator, normally a logic high, is a logic low when any overcurrent condition is detected, providing for initiation of system diagnostics and/or sending a warning message to the user. During power up, the G570 controls the rise time of the V CC and V PP outputs and limits the current into a faulty card or connector. If a short circuit is applied after power is established (e.g., hot insertion of a bad card), current is initially limited only by the impedance between the short and the power supply. In extreme cases, as much as 10A to 15A may flow into the short before the current limiting of the G570 engages. If the V CC or V PP outputs are driven below ground, the G570 may latch nondestructively in an off state. Cycling power will reestablish normal operation. Overcurrent limiting for the V CC outputs is designed to activate, if powered up, into a short in the range of 0.8A to 2.2A. The V PP outputs limit from 120mA to 400mA. The protection circuitry acts by linearly limiting the current passing through the switch rather than ini- tiating a full shutdown of the supply. Shutdown occurs only during thermal limiting. Thermal limiting prevents destruction of the IC from overheating if the package power-dissipation ratings are exceeded. Thermal limiting disables all power outputs (both A and B slots) until the device has cooled.
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. Logic Input and Outputs The serial interface consists of DATA, CLOCK, and LATCH leads. The data is clocked in on the positive leading edge of the clock (see Figure 2). The 9-bit (D0 through D8) serial data word is loaded during the positive edge of the latch signal. The latch signal should occur before the next positive leading edge of the block. The shutdown bit of the data word places all V CC and VPP outputs in a high-impedance state and reduces chip qui- escent current to 2µA to conserve battery power. The G570 serial interface is designed to be compatible with serial-interface PCMCIA controllers and current PCMCIA and Japan Electronic Industry Development Association (JEIDA) standards. An overcurrent output ( OC ) is provided to indicate an overcurrent condition in any of the VCC or VPP outputs as previously discussed. NOTE:MOSFET switches S9 and S12 have a back-gate diode from the source to the drain. Unused switch inputs should never be grounded. Figure 3 Internal Switching Matrix Thermal cs cs cs cs Card A VPP1 VPP2 VCC VCC Card B VCC VCC VPP2 VPP1 See Note A S10 S11 S12 See Note A Internal Current Monitor RESET RESET DATA CLOCK LATCH } Serial Interface OC GND Supervisor Controller CPU 3.3V 3.3V 3.3V 12V 12V G570
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. G570 control logic AVPP CONTROL SIGNALS INTERNAL SWITCH SETTING OUTPUT D8 SHDN D0 A_VPP_PGM D1 A_VPP_VCC S7 S8 S9 VAVPP 1 0 0 CLOSED OPEN OPEN 0V 1 0 1 OPEN CLOSED OPEN VCC* 1 1 0 OPEN OPEN CLOSED VPP(12 V) 1 1 1 OPEN OPEN OPEN Hi-Z 0 × × OPEN OPEN OPEN Hi-Z BVPP CONTROL SIGNALS INTERNAL SWITCH SETTING OUTPUT D8 SHDN D4 B_VPP_PGM D5 B_VPP_VCC S10 S11 S12 VBVPP 1 0 0 CLOSED OPEN OPEN 0V 1 0 1 OPEN CLOSED OPEN VCC** 1 1 0 OPEN OPEN CLOSED VPP(12V) 1 1 1 OPEN OPEN OPEN Hi-Z 0 × × OPEN OPEN OPEN Hi-Z AVCC CONTROL SIGNALS INTERNAL SWITCH SETTING OUTPUT D8 SHDN D3 3BCC_A D 2 5VCC_A S1 S2 S3 VAVCC 1 0 0 CLOSED OPEN OPEN 0V 1 0 1 OPEN CLOSED OPEN 3.3V 1 1 0 OPEN OPEN CLOSED 5V 1 1 1 CLOSED OPEN OPEN 0V 0 × × OPEN OPEN OPEN Hi-Z BVCC CONTROL SIGNALS INTERNAL SWITCH SETTING OUTPUT D8 SHDN D6 3VCC_B D 7 5VCC_B S4 S5 S6 VBVCC 1 0 0 CLOSED OPEN OPEN 0V 1 0 1 OPEN CLOSED OPEN 3.3V 1 1 0 OPEN OPEN CLOSED 5V 1 1 1 CLOSED OPEN OPEN 0V 0 × × OPEN OPEN OPEN Hi-Z *Output depends on AVCC **Output depends on BVCC
Global Mixed-mode Technology Inc. tors protects the devices from discharges up to 10 kV. Figure 4. Detailed Interconnections and Capacitor Recommendations
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. G570 28Pin Package A 2.0 0.079 A1 0.05 0.002 e 0.65 BASIC 0.026 BASIC θ 0 4 8 0 4 8 JEDEC MO-150 (AH) h x 45° C L θ E1 E SEATING PLANE 0.004 C D be A
Ver 1.0 Nov 09, 2000 TEL: 886-3-5788833 http://www.gmt.com.tw G570 Global Mixed-mode Technology Inc. G570 30Pin Package Note: 1. Dimensional tolerance ±0.10mm 2. Plating thickness 5~15 µm 3. Dimensions “D” does not include burrs, however dimension including protrusions or gate burrs Shall be MAX. 0.20mm 4. Dimension “E1” does not include inter-lead flash or protrusion. Inter-lead flash or protrusion small not exceeds 0.25 per side. e 0.65 BSC 0.026BSC θ 1° 4 ° 7 ° 1º 4° 7º D E 3.6 1.15 e b AA1 c θ L