MAX1602EEE

19-1125; Rev 0; 9/96 Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network _______________General Description The MAX1602 DC power-switching IC contains a network of low-resistance MOSFET switches that deliver selectable VCC and VPP voltages to a single CardBus or PC Card host socket. Key features include lowresistance switches, small packaging, soft-switching action, and compliance with PCMCIA specifications for 3V/5V switching. 3.3V-only power switching for fast, 32-bit CardBus applications is supported in two ways: 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 normally, even if the +5V and +12V supplies are disconnected or turned off to conserve power. The internal charge pumps are regulating types that draw reduced input current when the VCC switches are static. Power consumption is automatically reduced to 11µA max when the outputs are high-Z or GND. 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-overload protection, accurate current limiting, an overcurrent-fault flag output, and undervoltage lockouts. The CMOS/TTL-logic interface is flexible, and can tolerate logic input levels in excess of the positive supply rail. The MAX1602 fits a complete CardBus/PCMCIA switch into a space-saving, 16-pin QSOP package. ____________________________Features o Supports a Single PC Card/CardBus Socket o 1A, 0.25Ω Max 3.3V VCC Switch 1A, 0.25Ω Max 5V 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 11µA 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 16-Pin QSOP Package o Code Compatible with: Cirrus CL-PD67XX Family Databook DB86184 Intel 82365SL (industry-standard coding) MAX1602 __________Simplified Block Diagram 12IN VPP ________________________Applications Data Loggers Handy-Terminals Docking Stations PCMCIA Read/Write Drives CONTROL INPUTS VX VY VY MAX1602 VCC VCC VCC VCC VDD DECODE LOGIC CODE SELECT OVERCURRENT AND THERMAL SHUTDOWN FAULT CODE ______________Ordering Information PART MAX1602EEE TEMP. RANGE -40°C to +85°C PIN-PACKAGE 16 QSOP GND Pin Configuration appears on last page. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network MAX1602 ABSOLUTE MAXIMUM RATINGS Inputs/Outputs to GND (VX, VY, VCC) (Note 1) ..........................................-0.3V, +6V VPP Input/Output to GND (12IN, VPP) (Note 1) ............................................-0.3V, +15V Logic Inputs to GND (A0VCC, A1VCC, A0VPP, A1VPP) (Note 1)........................................-0.3V, +6V CODE Input to GND ........................................-0.3V, (VY + 0.3V) VCC Output Current (Note 2)...................................................4A VPP Output Current (Note 2).............................................260mA VCC Short Circuit to GND ..........................................Continuous VPP Short Circuit to GND ...........................................Continuous Continuous Power Dissipation (TA = +70°C) QSOP (derate 8.3mW/°C above +70°C) ....................667mW Operating Temperature Range MAX1602EEE .................................................-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. See the Electrical Characteristics. 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 (VY = 3.3V, VX = 5V, 12IN = 12V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER POWER-SUPPLY SECTION Input Voltage Range VX, VY 12IN VY falling edge 12IN falling edge 12IN rising edge VX falling edge VY Standby Supply Current VX Standby Supply Current 12IN Standby Supply Current VY Quiescent Supply Current VX Quiescent Supply Current 12IN Quiescent Supply Current VCC SWITCHES Operating Output Current Range On-Resistance, VY Switches On-Resistance, VX Switches Output Current Limit VCC, VX = VY = 3V to 5.5V 12IN = 0V to 13V, VY = 3V, VX = 0V to 5.5V, ISWITCH = 1A, TA = +25°C 12IN = 0V to 13V, VX = 4.5V, VY = 0V to 5.5V, ISWITCH = 1A, TA = +25°C VCC 1.2 0 0.09 0.09 1 0.25 0.25 4 A Ω Ω A All switches 0V or high-Z, control inputs = 0V or VY, TA = +25°C VX all switches 0V or high-Z, control inputs = 0V or VY, TA = +25°C All switches 0V or high-Z, control inputs = 0V or VY, TA = +25°C Any combination of VY switches on, control inputs = 0V or VY, no VCC loads Control inputs = 0V or VY, no VCC loads VPP 12V switches on, control inputs = 0V or VY, no VPP loads 20 10 5 3.0 11 2.4 1.8 5.0 1.4 5.5 13 2.8 10.0 2.8 11 1 1 200 50 100 µA µA µA µA µA µA V CONDITIONS MIN TYP MAX UNITS 2.6 3.0 8.0 1.9 3 Undervoltage Lockout Threshold V 2 _______________________________________________________________________________________ Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network ELECTRICAL CHARACTERISTICS (continued) (VY = 3.3V, VX = 5V, 12IN = 12V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER 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 FAULT Signal Propagation Delay FAULT Output Low Voltage FAULT Output Leakage Current Thermal Shutdown Threshold Logic Input Low Voltage Logic Input High Voltage Code Input Low Voltage Code Input High Voltage Code Input Mid-Level Voltage Logic Input Bias Current VCC or VPP, load step to FAULT output, 50% point to 50% point (Note 3) ISINK = 1mA, low state V FAULT = 5.5V, high state Hysteresis = 20°C (Note 4) __VCC, __VPP __VCC, __VPP “Intel” code “Cirrus” code “Databook” code __VCC, __VPP, code 1.5 0 VY - 0.4 1.2 -1 0.4 VY VY - 1.2 1 -0.5 150 0.6 1 0.4 0.5 µs V µA °C V V V V V µA VPP 12IN = 11.6V, ISWITCH = 100mA, TA = +25°C Programmed to VX (5V) or VY (3.3V), TA = +25°C VPP programmed to 12V VPP < 0.4V, programmed to 0V state VPP forced to 0V, high-Z state, TA = +25°C VPP, 0V to 12IN, CL = 0.1µF, 50% of input to 90% of output, TA = +25°C VPP, 0V to 12IN, CL = 0.1µF, 10% to 90% points, TA = +25°C VPP, 12IN to 0V, CL = 0.1µF, 50% of input to 10% of output, TA = +25°C VPP, 12IN to 0V, CL = 0.1µF, RL = 100Ω 90% to 10% points 100 130 10 0.1 1.2 600 9 6 60 10 30 0 0.70 3 200 120 1 6 260 mA Ω Ω mA mA µA ms µs ms ms CONDITIONS VCC < 0.4V, programmed to 0V state VCC forced to 0V, high-Z state, TA = +25°C VCC, 0V to VX or VY, CL = 30µF, RL = 25Ω, 50% of input to 90% of output, TA = +25°C VCC, 0V to VX or VY, CL = 1µF, RL = open circuit, 10% to 90% points, TA = +25°C VCC, VX or VY to 0V, CL = 30µF, RL = open circuit, 50% of input to 10% of output, TA = +25°C VCC, VX or VY to 0V, CL = 1µF, RL = 25Ω, 90% to 10% points 100 MIN 10 1 2 1200 90 6 150 10 10 TYP MAX UNITS mA µA ms µs ms ms MAX1602 3 _______________________________________________________________________________________ Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network MAX1602 ELECTRICAL CHARACTERISTICS (VY = 3.3V, VX = 5V, 12IN = 12V, TA = -40°C to +85°C, unless otherwise noted.) PARAMETER POWER-SUPPLY SECTION Input Voltage Range VX, VY 12IN VY falling edge, hysteresis = 1% 12IN falling edge 12IN rising edge VX, VY falling edge VY Standby Supply Current VX Standby Supply Current 12IN Standby Supply Current VY Quiescent Supply Current VX Quiescent Supply Current 12IN Quiescent Supply Current FAULT Output Low Voltage Logic Input Low Voltage Logic Input High Voltage All switches 0V or high-Z, control inputs = 0V or VY VX, all switches 0V or high-Z, control inputs = 0V or VY, TA = TMIN to TMAX All switches 0V or high-Z, control inputs = 0V or VY Any combination of VY switches on, control inputs = 0V or VY, no VCC loads Any combination of VX switches on, control inputs = 0V or high-Z, no VCC loads 12V switches on, control inputs = 0V or VY, no VPP loads ISINK = 1mA, low state __VCC, __VPP __VCC, __VPP 1.6 3.0 11 2.3 1.8 5 1.4 10 2.9 30 15 15 200 50 100 0.4 0.6 µA µA µA µA µA µA V V V 5.5 13 2.9 V CONDITIONS MIN TYP MAX UNITS Undervoltage Lockout Threshold V Note 3: Not production tested. Note 4: Thermal limit not active in standby state (all switches programmed to GND or high-Z state). 4 _______________________________________________________________________________________ Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network __________________________________________Typical Operating Characteristics (VY = 3.3V, VX = 5V, 12IN = 12V, TA = +25°C, unless otherwise noted.) VCC SWITCHING (RISE) MAX1602 TOC-01 MAX1602 VCC SWITCHING (RISE) 3 VCC (V) 2 1 0 CONTROL 5 INPUT 0 (V) MAX1602 TOC-02 6 VCC (V) 4 2 0 CONTROL INPUT 5 (V) 0 500µs/div CL = 30µF, RL = 25Ω CL = 1µF, RL = ∞ 500µs/div VCC SWITCHING (FALL) MAX1602 TOC-03 VCC SWITCHING (FALL) 6 VCC (V) 4 2 0 CONTROL 5 INPUT 0 (V) MAX1602 TOC-04 6 VCC (V) 4 2 0 CONTROL 5 INPUT 0 (V) CL = 33µF, RL = ∞ 10ms/div CL = 1µF, RL = 25Ω 20ms/div VPP SWITCHING (RISE) MAX1602 TOC-05 VPP SWITCHING (FALL) 15 10 VPP (V) 5 0 CONTROL 5 INPUT 0 (V) MAX1602 TOC-06 15 10 VPP (V) 5 0 CONTROL 5 INPUT 0 (V) CL = 0.1µF, RL = ∞ 200µs/div CL = 0.1µF, RL = ∞ 2ms/div _______________________________________________________________________________________ 5 Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network MAX1602 _____________________________Typical Operating Characteristics (continued) (VY = 3.3V, VX = 5V, 12IN = 12V, TA = +25°C, unless otherwise noted.) VCC CURRENT LIMITING MAX1602 TOC-07 INPUT CURRENT (VCC OUTPUT SHORTED) 2.0 1.5 IVY (A) 1.0 0.5 0 MAX1602 TOC-08 4 VCC (V) 2 0 2ms/div CL = 1µF, RESISTIVE OVERLOAD, RL = 1Ω 1ms/div VPP CURRENT LIMITING MAX1602 TOC-14 INPUT CURRENT (VPP OUTPUT SHORTED) 10 5 VPP (V) 0 300 I12IN (mA) 200 100 0 100µs/div RL = 0.1Ω MAX1600/3 TOC-15 10 VPP (V) 5 0 2ms/div CL = 1µF, RL = 50Ω 6 _______________________________________________________________________________________ Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network _____________________________Typical Operating Characteristics (continued) (VY = 3.3V, VX = 5V, 12IN = 12V, TA = +25°C, unless otherwise noted.) 12IN ON-RESISTANCE vs. CURRENT MAX1602-09 MAX1602 12IN ON-RESISTANCE vs. TEMPERATURE MAX1602-10 VX SUPPLY CURRENT vs. INPUT VOLTAGE 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 MAX1602 TOC-11 680 675 670 12IN RON (mΩ) 665 660 655 650 645 640 0 20 40 60 80 100 850 800 750 700 650 600 550 500 ILOAD = 100mA 0.9 VX, VY SUPPLY CURRENT (µA) 120 12IN RON (mΩ) -40 -20 0 20 40 60 80 100 0 1 2 3 4 5 6 CURRENT (mA) TEMPERATURE (°C) INPUT VOLTAGE (V) 12IN SUPPLY CURRENT vs. INPUT VOLTAGE MAX1602 TOC-17 VY SUPPLY CURRENT vs. INPUT VOLTAGE 45 VY SUPPLY CURRENT (µA) 40 35 30 25 20 15 10 5 0 SHUTDOWN NORMAL OPERATION MAX1602-018 7 12IN SUPPLY CURRENT (µA) 6 5 4 3 2 1 0 0 2 4 6 8 10 50 12 0 1 2 3 4 5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) VX ON-RESISTANCE vs. VCC LOAD CURRENT MAX1602-12 VY ON-RESISTANCE vs. VCC LOAD CURRENT 120 110 VX RON (mΩ) TA = +85°C MAX1602-13 130 120 110 VX RON (mΩ) 100 90 80 TA = -40°C 70 60 0 200 400 600 800 TA = +25°C TA = +85°C 130 100 90 80 70 60 TA = +25°C TA = -40°C 1000 0 200 400 600 800 1000 VCC LOAD CURRENT (mA) VCC LOAD CURRENT (mA) _______________________________________________________________________________________ 7 Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network MAX1602 ______________________________________________________________Pin Description PIN 1 2 3 4, 6, 7, 9 5 8, 10 11 12 13 14 15 16 NAME GND 12IN VPP VCC VX VY A0VPP A1VPP A0VCC A1VCC CODE FAULT Ground +12V Supply Voltage Input VPP Output VCC Output. Connect all four VCC pins together. VX Supply Voltage Input. Input range is +3.0V to +5.5V. VX is normally connected to 5V. VY and Logic Supply Voltage Inputs. VY pins must be connected together. Input range is +3V to +5.5V. VY is normally connected to 3.3V. VPP Control Input (see Logic Truth Tables). VPP Control Input (see Logic Truth Tables). VCC Control Input (see Logic Truth Tables). VCC Control Input (see Logic Truth Tables). Three-Level Code-Select Input (see Logic Truth Tables): Low = Standard “Intel” code, High = “Cirrus” code, Mid-Supply = “Databook” code (Figure 4). Fault-Detection Output. FAULT goes low during current limit, undervoltage lockout, or thermal limit. FAULT is an open-drain output that requires an external pull-up resistor. FUNCTION __________________________________________________________Logic Truth Tables Table 1. Standard “Intel” Code (82365SL), CODE = GND A1VCC A0VCC A1VPP A0VPP 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 VCC GND GND GND GND VY VY VY VY VX VX VX VX VY VY VY VY VPP GND GND GND GND GND VCC 12IN High-Z GND VCC 12IN High-Z GND VCC 12IN High-Z MODE STBY STBY STBY STBY Active Active Active Active Active Active Active Active Active Active Active Active Table 2. “Cirrus” Code, CODE = High (VY) A1VCC A0VCC A1VPP A0VPP 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 VCC High-Z High-Z High-Z High-Z VX VX VX VX VY VY VY VY GND GND GND GND VPP High-Z High-Z High-Z High-Z GND VCC 12IN High-Z GND VCC 12IN High-Z GND GND GND GND MODE STBY STBY STBY STBY Active Active Active Active Active Active Active Active STBY STBY STBY STBY STBY = Standby Mode STBY = Standby Mode 8 _______________________________________________________________________________________ Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network _________Logic Truth Tables (cont.) Table 3. “Databook” Code, CODE = Mid-Supply (VY/2) A1VCC A0VCC 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 AVPP 0 1 0 1 0 1 0 1 A0VPP X X X X X X X X VCC GND VY GND VX VY VY VX VX VPP High-Z 12IN GND 12IN VCC GND VCC GND MODE STBY Active STBY Active Active Active Active Active _______________Detailed Description The MAX1602 power-switching IC contains a network of low-resistance MOSFET switches that deliver selectable VCC and VPP voltages to two CardBus or PC Card host socket. Figure 1 is the detailed block diagram. The power-input pins (VY, VX, 12IN) are completely independent, however, power must always be applied to VY for proper operation. Low inrush current is guaranteed by controlled 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 MAX1602 STBY = Standby Mode, X = Don’t Care VB12 1Ω 12IN VPP MAX1602 CHARGE PUMP CURRENT LIMIT 6Ω 40Ω VY VY VB3 0.25Ω VCC VCC VCC VCC 40Ω CHARGE PUMP CURRENT LIMIT VX VB5 0.25Ω CHARGE PUMP CURRENT LIMIT FAULT VDD CONTROL INPUTS DECODE LOGIC AND UVLO SHDN THERMAL SHUTDOWN GND Figure 1. Detailed Block Diagram _______________________________________________________________________________________ 9 Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network MAX1602 independent of resistive and capacitive loads (see risetime 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 11µA. 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 switches) the switch turns off briefly, then turns on again at the controlled rise rate. If the overcurrent condition lasts more than 2µs, the FAULT output goes low. FAULT is not latched. A continuous short-circuit condition results in a pulsed output current and a pulsed FAULT output until thermal shutdown is reached. FAULT is open-drain and requires an external pull-up resistor. Operating Modes The MAX1602 is compatible with the Cirrus CL-PD67XX, Databook DB86184, and Intel 82365SL PC Card Interface Controllers (PCIC). Four control inputs select the internal switches’ positions and the operating modes according to the input code. Select the proper code format for the chosen controller with the CODE input pin (see Pin Description and Tables 1, 2, and 3). CODE reconfigures the logic decoder to one of three interface controllers: Low = Standard “Intel” code (Figure 3) High = “Cirrus” code (Figure 2) Mid-supply = “Databook” code (Figure 4) An additional 1µA (3µA max) of VY supply current will flow if CODE = mid-supply (VY/2). The MAX1602 has two operating modes: normal and standby. Normal mode supplies the selected outputs with their appropriate supply voltages. Standby mode places all switches at ground, high impedance, or a combination of the two. Thermal Shutdown If the IC junction temperature rises above +150°C, the thermal shutdown circuitry opens all switches, including the GND switches, and FAULT 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 switch input voltage drops below 1.9V, the associated switch turns off and FAULT goes low. For example, if VY is 3.3V and VX is 0V, and if the interface controller selects VY, the VCC output will be 3.3V. If VX is selected, VCC changes to a high-impedance output and FAULT 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 VY drops to less than 2.6V, all switches are turned off and the VCC and VPP outputs are high impedance. TO PC CARD SOCKET VCC SOCKET INTERFACE CIRRUS LOGIC CL-PD6720 CL-PD6722 CL-PD6729 VCC VPP +3.3V VY VY MAX1602 TO PC CARD SOCKET __________Applications Information Supply Bypassing Bypass the VY, VX, and 12IN inputs with ceramic 0.1µF capacitors. Bypass the VCC and VPP outputs with a 0.1µF capacitor for noise reduction and ESD protection. +5V +12V VX 12IN CODE GND A0VPP A1VPP A0VCC A1VCC A:VPP_VCC A:VPP_PGM A:VCC_5 A:VCC_3 GND Figure 2. Application with Cirrus Logic Interface 10 ______________________________________________________________________________________ Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network MAX1602 TO SOCKETS TO PC CARD SOCKET VCC VCC VPP VCC VPP SOCKET INTERFACE SOCKET INTERFACE VCC +3.3V VY VY MAX1602 A0VPP A1VPP 82365SL DF A:VPP_EN0 A:VPP_EN1 TO PC CARD SOCKET +3.3V VY VY MAX1602 DB87144 TO PC CARD SOCKET A1VPP +5V 1M A0VCC +12V 12IN CODE GND A1VCC A:VCC_EN0 A:VCC_EN1 ISA BUS +12V 12IN CODE GND VX A0VCC A1VCC +5V VX A:_VCTL1 A:_VCTL2 A:_VCTL0 1M NOTE: A0VPP, PIN 11 ON THE MAX1602, IS TIED TO GND. Figure 3. Application with Intel Interface Figure 4. Block Diagram of the Databook DB87144 PCI to CardBus Controller Interface to the MAX1602 ______________________________________________________________________________________ 11 Single-Channel CardBus and PCMCIA VCC/VPP Power-Switching Network MAX1602 __________________Pin Configuration TOP VIEW GND 1 12IN 2 VPP 3 VCC 4 VX 5 VCC 6 VCC 7 VY 8 16 FAULT 15 CODE 14 A1VCC ___________________Chip Information TRANSISTOR COUNT: 1452 MAX1602 13 A0VCC 12 A1VPP 11 A0VPP 10 VY 9 VCC QSOP ________________________________________________________Package Information DIM INCHES MILLIMETERS MAX MIN MIN MAX 0.068 0.061 1.55 1.73 0.004 0.0098 0.127 0.25 0.061 0.055 1.40 1.55 0.012 0.008 0.20 0.31 0.0075 0.0098 0.19 0.25 SEE VARIATIONS 0.157 0.150 3.81 3.99 0.25 BSC 0.635 BSC 0.244 0.230 5.84 6.20 0.016 0.010 0.25 0.41 0.035 0.016 0.41 0.89 SEE VARIATIONS SEE VARIATIONS 8° 0° 0° 8° DIM PINS D S D S D S D S 16 16 20 20 24 24 28 28 INCHES MILLIMETERS MIN MAX MIN MAX 0.189 0.196 4.80 4.98 0.0020 0.0070 0.05 0.18 0.337 0.344 8.56 8.74 0.0500 0.0550 1.27 1.40 0.337 0.344 8.56 8.74 0.0250 0.0300 0.64 0.76 0.386 0.393 9.80 9.98 0.0250 0.0300 0.64 0.76 21-0055A D A e B A1 S A A1 A2 B C D E e H h L N S α E H h x 45° A2 α N E C L QSOP QUARTER SMALL-OUTLINE PACKAGE Maxim Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.