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| a FEATURES 250 MHz Operation Driver/Comparator and Active Load Included On-Chip Schottky Diode Bridge 52-Lead LQFP Package with Built-In Heat Sink High-Performance Driver/Comparator Active Load on a Single Chip AD53509 FUNCTIONAL BLOCK DIAGRAM VCC VH 47 VTERM 45 DATA 37 DATA 38 IOD 43 IOD 42 RLD 49 RLD 50 VL 31 HCOMP LEH LEH QH QH COMPARATOR QL QL LEL LEL LCOMP ACTIVE LOAD VCOMI IOLC IOLRTN V/I +1 VCOMS DRIVER 46 VOUT VLDCPL VCC VCC VCC 51 52 34 VEE 39 VEE VEE VEE 40 41 32 39nF CHDCPL APPLICATIONS Automatic Test Equipment Semiconductor Test Systems Board Test Systems Instrumentation and Characterization Equipment AD53509 VHDCPL 39nF CLDCPL PRODUCT DESCRIPTION The AD53509 is a single chip that performs the pin electronics functions of driver, comparator and active load in ATE VLSI and memory testers. In addition, a Schottky diode bridge for the active load and a VCOM buffer are included internally. The driver is a proprietary design that features three active states: Data High Mode, Data Low Mode and Term Mode as well as an Inhibit State. This facilitates the implementation of high speed active termination. The output voltage range is -2 V to +7 V to accommodate a wide variety of test devices. The output leakage is typically less than 250 nA over the entire signal range. The dual comparator, with an input range equal to the driver output range, features built-in latches and ECL-compatible outputs. The outputs are capable of driving 50 signal lines terminated to -2 V. Signal tracking capability is upwards of 5 V/ns. The active load can be set for up to 40 mA load current with less than a 10 A linearity error through the entire set range. IOH, IOL and the buffered VCOM are independently adjustable. On-board Schottky diodes provide high speed switching and low capacitance. Also included on the chip is an on-board temperature sensor whose purpose is to give an indication of the surface temperature of the DCL. This information can be used to measure JC and JA or flag an alarm if proper cooling is lost. Output from the sensor is a current sink that is proportional to absolute temperature. The gain is trimmed to a nominal value of 1.0 A/K. As an example, the output current can be sensed by using a 10 k resistor connected from 10 V to the THERM (IOUT) pin. A voltage drop across the resistor will be developed that equals: 10K x 1 A/K = 10 mV/K = 2.98 V at room temperature. OUT_L IOHRTN INHL 36 INHL 35 IOHC V/I 9,33,44,46,48 2,5,8 THERM 1.0 A/K 14, 26 NC PWRGND VCCO HQGND2 HQGND NC = NO CONNECT REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 (c) Analog Devices, Inc., 2000 AD53509-SPECIFICATIONS DRIVER SPECIFICATIONS (All specifications are at TJ = 85 C measured at TJ = 75 C to 95 C.) Parameter 5 C, VS = 11 V Min 3%, -VS = -6 V = Typ Max 3% unless otherwise noted. All temperature coefficients are Unit Test Conditions DIFFERENTIAL INPUT CHARACTERISTICS (DATA to DATA, IOD to IOD, RLD to RLD) Input Voltage -2 Differential Input Range Bias Current -250 REFERENCE INPUTS Bias Currents OUTPUT CHARACTERISTICS Logic High Range Logic Low Range Amplitude (VH and VL) Absolute Accuracy VH Offset VH Gain + Linearity Error VL Offset VL Gain + Linearity Error Offset TC Output Resistance VH = -2 V VH = +7 V VL = -2 V VL = +6 V VH = +3 V Dynamic Current Limit Static Current Limit -50 -2 -2 0.1 -50 0.3 - 5 -50 -0.3 - 5 0.5 +3 2 +250 +50 +7 +6 9 +50 +0.3 + 5 +50 +0.3 + 5 V V A A V V V mV % of VH + mV mV % of VL + mV mV/C All Digital Inputs Within a 2 V Range VIN = -2 V, +3 V V L , VH , V T = 5 V DATA = H, VH = -2 V to +7 V, VL = -2 V, VT = 0 V DATA = L, VL = -2 V to +6 V, VH = 7 V, VT = 0 V VL = 0.0 V, VH = 0.1 V, VT = 0 V VL = -2 V, VH = +7 V, VT = 0 V DATA = H, VH = 0 V, VL = -2 V, VT = -1 V DATA = H, VH = -1 V to +7 V, VL = -2 V, VT = -2 V DATA = L, VL = 0 V, VH = 5 V, VT = 3 V DATA = L, VL = -2 V to +6 V, VH = 7 V, VT = 7 V VL = -2 V, VH = 0 V, VT = -1 V (VH Offset) VL = 0 V, VH = 5 V, VT = 3 V (VL Offset) VL = -2 V, VT = 0 V, IOUT = 0, +1, +30 mA VL = -1 V, VT = 0 V, IOUT = 0, -1, -30 mA VH = 6 V, VT = 0 V, IOUT = 0, 1, 30 mA VH = 7 V, VT = 0 V, IOUT = 0, -1, -30 mA VL = 0 V, VT = 0 V, IOUT = -30 mA (Trim Point) CBYP = 39 nF, VH = 6 V, VL = -2 V, VT = 0 V Output to -2 V, VH = 7 V, VL = -1 V, VT = 0 V DATA = H and Output to 7 V, VH = 6 V, VL = -2 V, VT = 0 V, DATA = L TERM MODE, VT = -2 V to +7 V, VL = 0 V, VH = 3 V TERM MODE, VT = 0 V, VL = 0 V, VH = 3 V TERM MODE, VT = -2 V to +7 V, VL = 0 V, VH = 3 V VT = 0 V, VL = 0 V, VH = 3 V IOUT = +30 mA, +1.0 mA, VT = -2.0 V, VH = 3 V, VL = 0 V IOUT = -30 mA, -1.0 mA, VT = +7.0 V, VH = 3 V, VL = 0 V IOUT = 30 mA, 1.0 mA, VT = 0 V, VH = 3 V, VL = 0 V Measured at 50%, VH = +400 mV, VL = -400 mV, VT = 0 V Measured at 50%, VH = +400 mV, VL = -400 mV, VT = 0 V Measured at 50%, VH = +400 mV, VL = -400 mV, VT = 0 V Measured 20%-80%, VL = 0 V, VH = 1 V, VT = 0 V Measured 20%-80%, VL = 0 V, VH = 3 V, VT = 0 V Measured 10%-90%, VL = 0 V, VH = 5 V, VT = 0 V Measured 10%-90%, VL = -2 V, VH = 7 V, VT = 0 V Measured 20%-80%, VL = 0 V, VH = 1 V Measured 20%-80%, VL = 0 V, VH = 3 V Measured 10%-90%, VL = 0 V, VH = 5 V VL, VH = -0.1 V, 0.1 V, VL, VH = 0.0 V, 1.0 V VL, VH = 0.0 V, 3.0 V, VL, VH = 0.0 V, 5.0 V VL, VH = -2.0 V, 7.0 V VL = 0 V, VH = 0.5 V, VT = -2 V VL = 0 V, VH = 0.5 V, VT = -2 V 44 44 44 44 46 46 46 46 46 >100 48 48 48 48 -85 +85 mA mA VTERM Voltage Range VTERM Offset VTERM Gain + Linearity Error Offset TC Output Resistance -2 -50 -0.3 +10 44 0.5 46 +7 V +50 mV +0.3 +10 % of VSET + mV mV/C 49 DYNAMIC PERFORMANCE, (VH AND VL) Propagation Delay Time Propagation Delay TC Delay Matching, Edge to Edge Rise and Fall Times 1 V Swing 3 V Swing 5 V Swing 9 V Swing Rise and Fall Time Temperature Coefficient 1 V Swing 3 V Swing 5 V Swing Overshoot and Preshoot 1.5 2 <100 ns ps/C ps 0.42 0.75 1.65 3.0 1 2 4 <3 + 50 ns ns ns ns ps/C ps/C ps/C % of Step + mV Settling Time to 15 mV to 4 mV <50 <10 ns s -2- REV. A AD53509 Parameter Delay Change vs. Pulsewidth Minimum Pulsewidth 3 V Swing 5 V Swing Toggle Rate DYNAMIC PERFORMANCE, INHIBIT Delay Time, Active to Inhibit Delay Time, Inhibit to Active Delay Time Matching (Z) Min Typ 50 1.4 2.0 250 3.3 2.9 <2 Max Unit ps ns ns MHz ns ns ns Test Conditions VL = 0 V, VH = 2 V, Pulsewidth = 2.5 ns/7.5 ns, 30 ns/90 ns VL = 0 V, VH = 3 V, 90% (2.7 V) Reached, Measure @ 50% VL = 0 V, VH = 5 V, 90% (4.5 V) Reached, Measure @ 50% VL = 0 V, VH = 5 V, VDUT > 3.0 V p-p Measured at 50%, VH = +2 V, VL = -2 V, VT = 0 V Measured at 50%, VH = +2 V, VL = -2 V, VT = 0 V Z = Delay Time Active to Inhibit Test (Above)-- Delay Time Inhibit to Active Test (Above) (Of Worst Two Edges) VH = 0 V, VL = 0 V, VT = 0 V VH = +2 V, VL = -2 V (Measured 20%/80% of 1 V Output) VH = +2 V, VL = -2 V (Measured 20%/80% of 1 V Output) Measured at 50%, VL = -1 V, VH = +1 V, VTERM = 0 V Measured at 50%, VL = VH = +0.4 V, VTERM = -0.4 V VH/VL, VTERM = (0 V, -1 V), (0 V, -2.0 V), (0 V, 6.0 V) VL = -2 V, VH = +2 V, VTERM = 0 V, 20%-80% VL = -2 V, VH = +2 V, VTERM = 0 V, 20%-80% VS = VS 3% I/O Spike Rise, Fall Time, Active to Inhibit Rise, Fall Time, Inhibit to Active DYNAMIC PERFORMANCE , VTERM Delay Time, VH to VTERM, VL to VTERM Delay Time, VTERM to VH and VTERM to VL Overshoot and Preshoot VTERM Mode Rise Time VTERM Mode Fall Time PSRR, DRIVE or TERM Mode Specifications subject to change without notice. 150 1.6 1.4 2.5 2.5 <3.0 + 75 2.2 2.2 35 mV, p-p ns ns ns ns % of Step + mV ns ns dB COMPARATOR SPECIFICATIONS (All specifications are at TJ = 85 C 5 C. [Outputs terminated in 150 to GND, +VS = 11 V otherwise specified.] All temperatures coefficients are measured at TJ = 75 C to 95 C.) Parameter DC INPUT CHARACTERISTICS Offset Voltage (VOS) Offset Voltage (Drift) HCOMP, LCOMP Bias Current Voltage Range (VCM) Differential Voltage (VDIFF) Gain and Linearity LATCH ENABLE INPUTS Logic "1" Current (IIH) Logic "0" Current (IIL) Logic Input Range DIGITAL OUTPUTS Logic "1" Voltage (VOH) Logic "0" Voltage (VOL) Slew Rate VCCO Range SWITCHING PERFORMANCE Propagation Delay Input to Output Latch Enable to Output Propagation Delay Temperature Coefficient Propagation Delay Change with Respect to Slew Rate: 0.5 V, 1.0 V, 3.0 V/ns Slew Rate: 5.0 V/ns Amplitude: 1.0 V, 3.0 V, 5.0 V Equivalent Input Rise Time Pulsewidth Linearity Settling Time Latch Timing Input Pulsewidth Setup Time Hold Time Hysteresis Specifications subject to change without notice. 3% -VS = 6 V 3%, VCCO = 3.3 V unless Min -25 Typ Max +25 Unit mV V/C A V V % FSR A A V V V V/ns V Test Conditions CMV = 0 V CMV = 0 V VIN = 0 V 50 -50 -2 -0.05 +50 +7.0 9.0 +0.05 250 -250 -2 VCCO - 0.98 VCCO - 1.5 1 0 8 +3 VIN = -2 V to +7 V (9 V FSR) LEA, LEA, LEB, LEB = +3 V LEA, LEA, LEB, LEB = -2 V Q or Q, 16.7 mA Load Q or Q, 10 mA Load 1.8 2 2 < 100 < 350 < 200 450 < 200 25 1.68 1.0 1.1 6 ns ns ps/C ps ps ps ps ps ns ns ns ns mV VIN = 2 V p-p, HCOMP = 1 V, LCOMP = 1 V VIN = 0 V to 5 V VIN = 0 V to 5 V VIN = 1.0 V/ns VIN = 0 V to 3 V, 3 V/ns VIN = 0 V to 3 V, 3 V/ns, PW = 3 ns-8 ns Settling to 8 mV, VIN = 1 V to 0 V Latch Inputs Programmed for Hysteresis REV. A -3- AD53509-SPECIFICATIONS ACTIVE LOAD SPECIFICATIONS (All specifications are at TJ = 85 C measured at TJ = 75 C to 95 C.) Parameter INPUT CHARACTERISTICS INHL, INHL Input Voltage Bias Current IOHC Current Program Range IOH = 0 mA to -40 mA IOLC Current Program Range IOL = 0 mA to +40 mA IOHC, IOLC Input Bias Current IOLRTN, IOHRTN Range VDUT Range VDUT Range, IOH = 0 mA to -40 mA VDUT Range, IOL = 0 mA to +40 mA VCOMI Input Range OUTPUT CHARACTERISTICS Accuracy Absolute Accuracy Error, Load Current 5 C, +VS = 11 V Min 3%, -VS = -6 V = Typ Max 3% unless otherwise noted. All temperature coefficients are Unit Test Conditions -2 -250 0 0 -300 -2 -2 -0.7 -2 -2 +3 250 4 4 +300 +7 +7 +7 +5.7 +7 V A V V A V V V V V IOHC = 1 V, IOLC = 1 V, VCOM = 2 V, OUT_L = 0 V INHL, INHL = -2 V, +3 V OUT_L = -0.7 V, +7 V OUT_L = -2 V, +5.7 V IOLC = 0 V, 4.0 V and IOHC = 0 V, 4.0 V IOL = +40 mA, IOH = -40 mA, OUT_L = -2 V, +7 V IOL = +40 mA, IOH = -40 mA, IOUT_L-VCOMI >1.3 V OUT_L -VCOM > 1.3 V VCOM-VDUT > 1.3 V IOL = +40 mA, IOH = -40 mA -0.3 - 100 +0.3 + 100 % ISET + A IOL, IOH = 25 A-40 mA, VCOM = 0 V, OUT_L = 2 V and IOL = 25 A-40 mA, VCOM = +7 V, OUT_L = +5.7 V and IOH = 25 A-40 mA, VCOM = -2 V, OUT_L = -0.7 V IOL, IOH = 40 mA, VCOMI = 0 V, OUT_L = VCOM VCOMI = 0 V, OUT_L = VCOM IOL, IOH = 40 mA, VCOMI = -1 V to +6 V, VOUT = VCOM IOL, IOH = 40 mA, VCOMI = -1 V to +6 V, VOUT = VCOM Measured at IOH, IOL = 200 A VCOM Buffer Offset Error Bias Current Gain Error Linearity Error Output Current TC DYNAMIC PERFORMANCE Propagation Delay IOUT to Inhibit Inhibit to IOUT Propagation Delay Matching I/O Spike Settling Time to 15 mV Settling Time to 4 mV Specifications subject to change without notice. -50 -10 -0.2 -10 +1 +50 +10 +0.2 +10 mV A % mV A/C < 2 1.9 2.8 <1.8 240 <50 <10 ns ns ns mV ns s VCOM = 2 V, IOL = +20 mA, IOH = -20 mA VCOM = 2 V, IOL = +20 mA, IOH = 20 mA VCOM = 0 V, IOL = +20 mA, IOH = -20 mA IOL = +20 mA, IOH = -20 mA, 50 Load, to IOL = +20 mA, IOH = -20 mA, 50 Load, to 15 mV 4 mV -4- REV. A AD53509 TOTAL FUNCTION SPECIFICATIONS (All specifications are at TJ = 85 C measured at TJ = 75 C to 95 C.) Parameter OUTPUT CHARACTERISTICS Output Leakage Current, VOUT = -1 V to +5 V Output Leakage Current, VOUT = -2 V to +7 V Output Capacitance POWER SUPPLIES Total Supply Range Positive Supply Negative Supply Positive Supply Current Negative Supply Current VCCO Current Total Power Dissipation Temperature Sensor Gain Factor 5 C, VS = 11 V Min 3%, -VS = -6 V = Typ Max +250 +500 8 17 11 -6 280 290 65 4.8 1 3% unless otherwise noted. All temperature coefficients are Unit nA A pF V V V mA mA mA W A/K Test Conditions -250 -500 Driver and Load INHIBITED Driver = INH, ILOAD Program = 40 mA, Load = Active Driver = INH, ILOAD Program = 40 mA, Load = Active VCCO = 3.3 V, Comparator Output 150 to GND Driver = INH, ILOAD Program = 40 mA, Load = Active RLOAD = 10 k, VSOURCE = 11 V NOTES Connecting or shorting the decoupling pins to ground will result in the destruction of the device. Specifications subject to change without notice. Table I. Driver Truth Table DATA 0 1 X X DATA 1 0 X X IOD 1 1 0 0 IOD 0 0 1 1 RLD X X 0 1 RLD X X 1 0 OUTPUT STATE VL VH INH VTERM Table II. Comparator Truth Table VOUT >HCOMP >HCOMP LEH 0 0 0 0 1 LEL 1 1 1 1 0 LEL 0 0 0 0 1 QH OUTPUT STATES QH QL 0 0 1 1 QH (t - 1) 1 0 1 0 QL (t - 1) QL 0 1 0 1 QL (t - 1) 1 1 0 0 QH (t - 1) Table III. Active Load Truth Table OUT_L INHL 0 0 1 INHL 1 1 0 IOH OUTPUT STATES (Including Diode Bridge) IOL I(OUT_L) V(IOLC) x 10 mA V(IOLC) x 10 mA 0 IOL IOH 0 V(IOHC) x 10 mA V(IOHC) x 10 mA 0 REV. A -5- AD53509 ABSOLUTE MAXIMUM RATINGS 1 Power Supply Voltage VCC to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 V VEE to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8 V VCC to VEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V VCCO to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V PWR GND HQ GND . . . . . . . . . . . . . . . . . . . . . . . 0.4 V Inputs DATA, DATA, IOD, IOD, RLD, RLD . . . . . . +5 V, -2 V DATA to DATA, IOD to IOD, RLD to RLD . . . . . . . 3 V LEL, LEL, LEH, LEH . . . . . . . . . . . . . . . . . . . +5 V, -2 V LEL to LEL, LEH to LEH . . . . . . . . . . . . . . . . . . . . . 3 V INHL, INHL . . . . . . . . . . . . . . . . . . . . . . . . . . . +5 V, -2 V INHL to INHL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 V VH, VL, VTERM, VCOM_I to GND . . . . . . . . +8 V, -3 V VH to VL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V (VH-VTERM) and (VTERM - VL) . . . . . . . . . . . . . 10 V IOHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V IOLC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V HCOMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +8 V, -3 V LCOMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +8 V, -3 V HCOMP, LCOMP to VOUT . . . . . . . . . . . . . . . . . . . 10 V Outputs VOUT Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite2 VOUT Inhibit Mode . . . . . . . . . . . . . . . . . . . . . . . +8 V, -3 V VHDCPL . . . . . . . . Do Not Connect Except for Cap to VCC VLDCPL . . . . . . . . Do Not Connect Except for Cap to VEE QH, QH, QL, QL Maximum IOUT Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Surge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA THERM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 V, 0 V IOHRTN, IOLRTN . . . . . . . . . . . . . . . . . . +8.5 V, -3.5 V VCOM_S Short Circuit Duration . . . . . . . . . . . . . . . 3 sec2 Environmental Operating Temperature (Junction) . . . . . . . . . . . . . . . 175C Storage Temperature . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 10 sec)3 . . . . . . . . . . . 260C NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Absolute maximum limits apply individually, not in combination. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2 Output short circuit protection is guaranteed as long as proper heat sinking is employed to ensure compliance with the operating temperature limits. 3 To ensure lead coplanarity ( 0.002 inches) and solderability, handling with bare hands should be avoided and the device should be stored in environments at 24 C 5C (75F 10F) with relative humidity not to exceed 65%. Table IV. Package Thermal Characteristics Air Flow, FM 0 200 400 JA, C/W 33 25 22 ORDERING GUIDE Model AD53509JSQ Package Description 52-Lead LQFP-EDQUAD Shipment Method Quantity per Shipping Container 90 Package Option SQ-52 CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD53509 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. WARNING! ESD SENSITIVE DEVICE -6- REV. A AD53509 PIN CONFIGURATION PWRGND VH PWRGND VCC VCC RLD RLD VTERM PWRGND IOD IOD VEE 52 51 50 49 48 47 46 45 44 43 42 41 40 VEE 39 VCC 1 VCCO 2 QL 3 QL 4 VCCO 5 QH 6 QH 7 VCCO 8 PWRGND 9 LEL 10 LEL 11 LEH 12 LEH 13 PIN 1 IDENTIFIER VEE DATA DATA 36 INHL 38 37 AD53509 HEAT SINK UP (Not to Scale) INHL VCC 33 PWRGND 35 34 32 31 30 29 28 27 VEE VL IOLC IOHC HQGND IOHRTN 14 15 16 17 18 19 20 21 22 23 24 25 26 HCOMP LCOMP THERM NC VHDCPL HQGND2 NC = NO CONNECT REV. A -7- VLDCPL IOLRTN VCOMS VCOMI NC VOUT OUT_L AD53509 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 52-Lead LQFP-EDQUAD with Integral Heat Slug (SQ-52) 0.063 (1.60) MAX 0.030 (0.75) 0.024 (0.60) 0.018 (0.45) SEATING PLANE 0.630 (16.00) SQ 0.551 (14.00) SQ 52 1 40 39 TOP VIEW (PINS DOWN) 0.270 (6.86) DIA STANDOFF 0.004 (0.10) MAX 0.006 (0.15) 0.002 (0.05) 13 14 26 27 0.057 (1.45) 0.055 (1.40) 0.053 (1.35) 7 3.5 0 0.020 (0.50) 0.017 (0.42) 0.014 (0.35) CENTER FIGURES ARE TYPICAL UNLESS OTHERWISE NOTED 0.008 (0.20) 0.004 (0.09) 0.039 (1.00) BSC -8- REV. A PRINTED IN U.S.A. C01539-0-12/00 (rev. A) |
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