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| (R) T nt DUC PRO placeme TE Re OLE d September 1998 OBS mende com Re No HA4244 File Number 4078.2 480MHz, 1 x 1 Video Crosspoint Switch with Synchronous Enable The HA4244 is a very wide bandwidth 1 x 1 crosspoint switch ideal for professional video switching, HDTV, computer monitor routing, and other high performance applications. The circuit features very low power dissipation, excellent differential gain and phase, high off isolation, symmetric slew rates, fast switching, and a latched enable signal. When disabled, the output is switched to a high impedance state, making the HA4244 ideal for routing matrix equipment. The latched enable input allows for synchronized channel switching. When CLK is low the master control latch loads the next EN, while the closed slave control latch maintains the crosspoint in its current state. CLK switching high closes the master latch, loads the now open slave latch, and enables or disables the HA4244 according to the current state of the EN input. This crosspoint's design ensures that it powers up in the disabled state to eliminate bus contention concerns, and to minimize supply current draw at power up. For applications requiring an asynchronous crosspoint switch, please refer to the HA4201 and HA4600 data sheets. Features * Low Power Dissipation. . . . . . . . . . . . . . . . . . . . . 105mW * Symmetrical Slew Rates . . . . . . . . . . . . . . . . . . 1700V/s * 0.1dB Gain Flatness. . . . . . . . . . . . . . . . . . . . . . . 250MHz * -3dB Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . 480MHz * Off Isolation (100MHz) . . . . . . . . . . . . . . . . . . . . . . . 85dB * Differential Gain and Phase . . . . . . . 0.01%/0.01 Degrees * High ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . >1800V * TTL Compatible Control Signals * Latched Enable Input for Synchronous Switching * Powers-Up in Disabled State; Avoids Bus Contention Applications * Professional Video Switching and Routing * Video Multiplexers * Computer Graphics * RF Switching and Routing * PCM Data Routing Functional Diagram IN EN DL Q C DL Q C OUT Part Number Information PART NUMBER (BRAND) HA4244CB (H4244C) TEMP. RANGE ( oC) 0 to 70 PACKAGE 8 Ld SOIC PKG. NO. M8.15 Pinout CLK Timing Diagram CLK EN VEN V+ DIS ENABLED DIS OUT 1 2 3 4 HA4244 (SOIC) TOP VIEW 8 GND 7 IN 6 NC 5 CLK OUT 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2002. All Rights Reserved HA4244 Absolute Maximum Ratings Voltage Between V+ and V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSUPPLY Digital Input Current (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . 25mA Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Thermal Information Thermal Resistance (Typical, Note 1) JA (oC/W) Operating Conditions Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only) CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTES: 1. JA is measured with the component mounted on an evaluation PC board in free air. 2. If an input signal is applied before the supplies are powered up, the input current must be limited to this maximum value. Electrical Specifications VSUPPLY = 5V, RL = 10k, VEN = 2.0V, Unless Otherwise Specified HA4244 PARAMETER DC SUPPLY CHARACTERISTICS Supply Voltage Supply Current (VOUT = 0V) VEN = 2.0V VEN = 2.0V VEN = 0.8V VEN = 0.8V ANALOG DC CHARACTERISTICS Output Voltage Swing without Clipping VOUT = VIN VIO 20mV 25, 70 0 Output Current Input Bias Current Output Offset Voltage Output Offset Voltage Drift (Note 3) SWITCHING CHARACTERISTICS Turn-On Time Turn-Off Time DIGITAL DC CHARACTERISTICS Input Logic High Voltage Input Logic Low Voltage EN Input Current CLK Input Current EN Setup Time to CLK Rising Edge EN Hold Time after CLKRising Edge VEN = 0 to 4V VCLK = 0 to 4V Full Full Full Full Full Full 2 -2 -10 25 10 0.8 2 10 V V A A ns ns 25 25 160 320 ns ns Full Full 25 Full 2.7 2.4 15 -10 2.8 2.5 20 30 25 50 10 50 V V mA A mV V/oC Full 25, 70 0 25, 70 0 4.5 5.0 10.5 5.5 13 14.5 275 325 V mA mA A A TEST CONDITIONS TEMP. (oC) MIN TYP MAX UNITS 2 HA4244 Electrical Specifications VSUPPLY = 5V, RL = 10k, VEN = 2.0V, Unless Otherwise Specified (Continued) HA4244 PARAMETER AC CHARACTERISTICS Insertion Loss -3dB Bandwidth 1V P-P RS = 82, CL = 10pF RS = 43, CL = 15pF RS = 36, CL = 21pF 0.1dB Flat Bandwidth RS = 82, CL = 10pF RS = 43, CL = 15pF RS = 36, CL = 21pF Input Resistance Input Capacitance Enabled Output Resistance Disabled Output Capacitance Differential Gain Differential Phase Off Isolation Slew Rate (1.5VP-P, +SR/-SR) VEN = 0.8V 4.43MHz, Note 3 4.43MHz, Note 3 1V P-P, 100MHz, VEN = 0.8V, RL = 10 RS = 82, CL = 10pF RS = 43, CL = 15pF RS = 36, CL = 21pF Total Harmonic Distortion Disabled Output Resistance NOTE: 3. This parameter is not tested. The limits are guaranteed based on lab characterization, and reflect lot-to-lot variation. Note 3 Full 25 25 25 25 25 25 Full Full Full Full 25 25 Full 25 25 25 Full Full 200 0.04 480 380 370 250 175 170 400 1.0 15 2.0 0.01 0.01 85 1750/1770 1460/1360 1410/1360 0.01 12 0.05 0.02 0.02 0.1 dB MHz MHz MHz MHz MHz MHz k pF pF % Degrees dB V/s V/s V/s % M TEST CONDITIONS TEMP. (oC) MIN TYP MAX UNITS AC Test Circuit PC Board Layout The frequency response of this circuit depends greatly on the care taken in designing the PC board. The use of low inductance components such as chip resistors and chip capacitors is strongly recommended, while a solid ground plane is a must! Attention should be given to decoupling the power supplies. A large value (10F) tantalum in parallel with a small value (0.1F) chip capacitor works well in most cases. Keep input and output traces as short as possible, because trace inductance and capacitance can easily become the performance limiting items. HA4244 VIN 75 500 RS 400 510 + - 75 HFA1100 VOUT CX 10k NOTE: CL = CX + Test Fixture Capacitance. 3 HA4244 Application Information General The HA4244 is a synchronous 1 x 1 crosspoint switch that is ideal for the matrix element in small, high input-to-output isolation switchers and routers. The HA4244's low input capacitance and high input resistance provide excellent video terminations when used with an external 75 resistor. This crosspoint contains no feedback or gain setting resistors, so the output is a true high impedance load when the IC is disabled (EN = 0). CLK - An active high, TTL/CMOS compatible input that controls the synchronizing latches. When CLK transistions low, the current state of the EN input is latched in the IC. This allows the EN input to be changed to the value correspending to the next channel switch, without affecting the HA4244's current state. The HA4244 assumes the new state on the next rising edge of CLK. Power Up Considerations No signals should be applied to the digital inputs before the power supplies are activated. Latch-up may occur if the inputs are driven at the time of power up. To prevent latchup, the input currents during power up must not exceed the values listed in the Absolute Maximum Ratings. Synchronizing Latches The HA4244 contains two latches which gate the EN input, thereby allowing all the crosspoints in a matrix to switch states synchronously. The latches also allow the EN input to be changed without affecting the current state of the HA4244. Thus, the next channel switch can be set up, and isn't acted upon until the next rising CLK edge. As long as the EN signals meet a setup and hold time relative to the rising CLK edge, all of the HA4244s will assume their new state at the same time. Harris' Crosspoint Family Harris offers a variety of 1 x 1 and 4 x 1 crosspoint switches. In addition to the HA4244, the 1 x 1 family includes the HA4600, which is an essentially similar device but without the synchronizing latches, and the HA4201 asynchronous crosspoint with a Tally output (enable indicator). The 4 x 1 family is comprised of the HA4314, HA4404, and HA4344. The HA4314 is a 14 lead basic 4 x 1 crosspoint. The HA4404 is a 16 lead device with Tally outputs to indicate the selected channel. The HA4344 is a 16 lead crosspoint with synchronized control lines (A0, A1, CS). With synchronization, the control information for the next channel switch can be loaded into the crosspoint without affecting the current state. On a subsequent clock edge the stored control state effects the desired channel switch. Power-Up Disable Function The double latched EN signal, and single CLK input prevent the user from controlling the crosspoint state at power-up. To rectify this situation, the HA4244 incorporates power-up circuitry to ensure that the crosspoint powers up in the disabled state. Disabling the HA4244 prevents bus contention between multiplexed outputs, and minimizes the switching matrix supply current during power-up. Consider, for example, a matrix of 625 crosspoints that power-up randomly. If 50% of them power-up enabled, the required matrix supply current is 3.3A (313 x 10.5mA), neglecting output current. If HA4244s are utilized the power-up current is reduced to 0.125A (625 x 200A). Frequency Response Most applications utilizing the HA4244 require a series output resistor, R S, to tune the response for the specific load capacitance, C L, driven. Bandwidth and slew rate degrade as CL increases (as shown in the Electrical Specification table), so give careful consideration to component placement to minimize trace length. As an example, -3dB bandwidth decreases to 160MHz for CL = 100pF, RS = 0. In big matrix configurations where CL is large, better frequency response is obtained by cascading two levels of crosspoints in the case of multiplexed outputs, or distributing the load between two drivers if CL is due to bussing and subsequent stage input capacitance. Control Signals EN - The ENABLE input is a TTL/CMOS compatible, active high input. When driven low this input forces the output to a true high impedance state and reduces the power dissipation by two orders of magnitude. 4 HA4244 Typical Performance Curves 1.0 0.75 0.5 0.25 0 -0.25 -0.5 -0.75 -1.0 TIME (5ns/DIV.) INPUT CAPACITANCE (pF) OUTPUT VOLTAGE (V) VSUPPLY = 5V, TA = 25oC, RL = 10k, Unless Otherwise Specified 1.25 1.20 1.15 1.10 1.05 1.0 0.95 0.90 0.85 0.80 0.75 1 10 FREQUENCY (MHz) 100 500 FIGURE 1. LARGE SIGNAL PULSE RESPONSE FIGURE 2. INPUT CAPACITANCE vs FREQUENCY 12 9 6 GAIN (dB) 3 0 -3 -6 -9 -12 1 10 100 FREQUENCY (MHz) 750 RS = 36 CL = 21pF RS = 82 R = 43 CL = 10pF S CL = 15pF 0.4 0.3 0.2 GAIN (dB) 0.1 0 -0.1 -0.2 -0.3 -0.4 1 10 FREQUENCY (MHz) 100 500 RS = 82 CL = 10pF RS = 36 CL = 21pF RS = 43 CL = 15pF FIGURE 3. FREQUENCY RESPONSE FIGURE 4. GAIN FLATNESS -50 -60 OFF ISOLATION (dB) -70 -80 -90 -100 -110 -120 -130 1 VIN = 1VP-P RL = 10 10 100 FREQUENCY (MHz) 500 FIGURE 5. OFF ISOLATION 5 HA4244 Die Characteristics DIE DIMENSIONS: 51 mils x 36 mils x 19 mils 1290m x 910m x 483m METALLIZATION: Type: Metal 1: AlCu (1%)/TiW Thickness: Metal 1: 6kA 0.8kA Type: Metal 2: AlCu (1%) Thickness: Metal 2: 16kA 1.1kA PASSIVATION: Type: Nitride Thickness: 4kA 0.5kA TRANSISTOR COUNT: 53 SUBSTRATE POTENTIAL (Powered Up): V- Metallization Mask Layout HA4244 EN GND VIN V+ OUT CLK 6 |
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