CT ODU cement R P TE Repla OLE d September 1998 OBS mende m o c e No R ® HA4244 File Number 4078.2 480MHz, 1 x 1 Video Crosspoint Switch with Synchronous Enable Features 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. • Symmetrical Slew Rates . . . . . . . . . . . . . . . . . . 1700V/µs • Low Power Dissipation. . . . . . . . . . . . . . . . . . . . . 105mW • 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 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. • TTL Compatible Control Signals 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. • Video Multiplexers For applications requiring an asynchronous crosspoint switch, please refer to the HA4201 and HA4600 data sheets. • Powers-Up in Disabled State; Avoids Bus Contention Applications • Professional Video Switching and Routing • Computer Graphics • RF Switching and Routing • PCM Data Routing Part Number Information Functional Diagram IN OUT EN • Latched Enable Input for Synchronous Switching DL Q DL Q C C PART NUMBER (BRAND) TEMP. RANGE ( oC) HA4244CB (H4244C) 0 to 70 PACKAGE 8 Ld SOIC PKG. NO. M8.15 Pinout CLK HA4244 (SOIC) TOP VIEW Timing Diagram CLK EN OUT DIS ENABLED 1 DIS EN 1 8 GND V- 2 7 IN V+ 3 6 NC OUT 4 5 CLK 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 © Intersil Americas Inc. 2002. All Rights Reserved HA4244 Absolute Maximum Ratings Thermal Information Voltage Between V+ and V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSUPPLY Digital Input Current (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . ±25mA Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Thermal Resistance (Typical, Note 1) Operating Conditions θJA (oC/W) 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) Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC 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. θJA 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 = 10kΩ, VEN = 2.0V, Unless Otherwise Specified HA4244 TEMP. (oC) MIN TYP MAX UNITS Full ±4.5 ±5.0 ±5.5 V VEN = 2.0V 25, 70 - 10.5 13 mA VEN = 2.0V 0 - - 14.5 mA VEN = 0.8V 25, 70 - - 275 µA VEN = 0.8V 0 - - 325 µA 25, 70 ±2.7 ±2.8 - V 0 ±2.4 ±2.5 - V Output Current Full 15 20 - mA Input Bias Current Full - 30 50 µA Output Offset Voltage 25 -10 - 10 mV Output Offset Voltage Drift (Note 3) Full - 25 50 µV/oC Turn-On Time 25 - 160 - ns Turn-Off Time 25 - 320 - ns Input Logic High Voltage Full 2 - - V Input Logic Low Voltage Full - - 0.8 V PARAMETER TEST CONDITIONS DC SUPPLY CHARACTERISTICS Supply Voltage Supply Current (VOUT = 0V) ANALOG DC CHARACTERISTICS Output Voltage Swing without Clipping VOUT = VIN ± VIO ± 20mV SWITCHING CHARACTERISTICS DIGITAL DC CHARACTERISTICS EN Input Current VEN = 0 to 4V Full -2 - 2 µA CLK Input Current VCLK = 0 to 4V Full -10 - 10 µA EN Setup Time to CLK Rising Edge Full - 25 - ns EN Hold Time after CLKRising Edge Full - 10 - ns 2 HA4244 Electrical Specifications VSUPPLY = ±5V, RL = 10kΩ, VEN = 2.0V, Unless Otherwise Specified (Continued) HA4244 PARAMETER TEST CONDITIONS TEMP. (oC) MIN TYP MAX UNITS AC CHARACTERISTICS Insertion Loss 1V P-P Full - 0.04 0.05 dB -3dB Bandwidth RS = 82Ω, CL = 10pF 25 - 480 - MHz RS = 43Ω, CL = 15pF 25 - 380 - MHz RS = 36Ω, CL = 21pF 25 - 370 - MHz RS = 82Ω, CL = 10pF 25 - 250 - MHz RS = 43Ω, CL = 15pF 25 - 175 - MHz RS = 36Ω, CL = 21pF 25 - 170 - MHz Input Resistance Full 200 400 - kΩ Input Capacitance Full - 1.0 - pF Enabled Output Resistance Full - 15 - Ω ±0.1dB Flat Bandwidth Disabled Output Capacitance VEN = 0.8V Full - 2.0 - pF Differential Gain 4.43MHz, Note 3 25 - 0.01 0.02 % Differential Phase 4.43MHz, Note 3 25 - 0.01 0.02 Degrees Off Isolation 1V P-P, 100MHz, VEN = 0.8V, RL = 10Ω Full - 85 - dB Slew Rate (1.5VP-P, +SR/-SR) RS = 82Ω, CL = 10pF 25 - 1750/1770 - V/µs RS = 43Ω, CL = 15pF 25 - 1460/1360 - V/µs RS = 36Ω, CL = 21pF 25 - 1410/1360 - V/µs Note 3 Full - 0.01 0.1 % Full - 12 - MΩ 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. AC Test Circuit HA4244 500Ω RS PC Board Layout 510Ω 400Ω - VIN 75Ω + CX 10kΩ NOTE: CL = CX + Test Fixture Capacitance. 75Ω HFA1100 VOUT 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 (10µF) tantalum in parallel with a small value (0.1µF) 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. 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 75Ω 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). 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. 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 200µA). 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 = 0Ω. 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 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. 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. HA4244 VSUPPLY = ±5V, TA = 25oC, RL = 10kΩ, Unless Otherwise Specified 1.0 1.25 0.75 1.20 INPUT CAPACITANCE (pF) OUTPUT VOLTAGE (V) Typical Performance Curves 0.5 0.25 0 -0.25 -0.5 -0.75 1.15 1.10 1.05 1.0 0.95 0.90 0.85 0.80 0.75 -1.0 1 TIME (5ns/DIV.) FIGURE 1. LARGE SIGNAL PULSE RESPONSE 0.4 9 0.3 RS = 36Ω CL = 21pF -6 -0.3 -12 -0.4 750 RS = 82Ω CL = 10pF 10 1 FIGURE 4. GAIN FLATNESS VIN = 1VP-P RL = 10Ω -60 -70 -80 -90 -100 -110 -120 -130 1 10 100 FREQUENCY (MHz) FIGURE 5. OFF ISOLATION 5 100 FREQUENCY (MHz) FIGURE 3. FREQUENCY RESPONSE -50 RS = 43Ω CL = 15pF 0 -0.1 -0.2 10 100 FREQUENCY (MHz) 500 0.1 -9 1 RS = 36Ω CL = 21pF 0.2 GAIN (dB) 0 -3 OFF ISOLATION (dB) GAIN (dB) RS = 82Ω R = 43Ω CL = 10pF S CL = 15pF 3 100 FIGURE 2. INPUT CAPACITANCE vs FREQUENCY 12 6 10 FREQUENCY (MHz) 500 500 HA4244 Die Characteristics DIE DIMENSIONS: PASSIVATION: 51 mils x 36 mils x 19 mils 1290µm x 910µm x 483µm Type: Nitride Thickness: 4kÅ ±0.5kÅ METALLIZATION: TRANSISTOR COUNT: Type: Metal 1: AlCu (1%)/TiW Thickness: Metal 1: 6kÅ ±0.8kÅ 53 SUBSTRATE POTENTIAL (Powered Up): Type: Metal 2: AlCu (1%) Thickness: Metal 2: 16kÅ ±1.1kÅ V- Metallization Mask Layout HA4244 EN GND VIN V+ CLK OUT 6