MAX498

Supply Voltage (V_CC to V_EE)................................................+12V
Voltage on IN__ to GND ..................(V_EE - 0.3V) to (V_CC + 0.3V)
Voltage on Digital Inputs
LE, EN, A₀, CS) ..........................................-0.3V to (V_CC + 0.3V)
Voltage on OUT_ (disabled) ................................................±4V
Output Short-Circuit Duration
to -4V OUT_ +4V ...............................................Continuous
Continuous Power Dissipation (TA = +70°C)
24-Pin SO (derate 11.76mW/°C above +70°C)............941mW
28-Pin SO (derate 12.5mW/°C above +70°C).....................1W
Operating Temperature Range ..........................0°C to +70°C
Storage Temperature Range ........................-65°C to +150°C
Lead Temperature (soldering, 10sec) ..........................+300°C
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.

The MAX498/MAX499 are high-speed, quad/triple, single- pole/double-throw video switches with on-board closed-loop buffer amplifiers. The buffer amplifiers feature +6dB gain (AVCL = 2V/V), 250MHz -3dB bandwidth, 70MHz 0.1dB gain flatness, and 1250V/ms slew rate. Fast switching time (3ns) and fast settling time (12ns for a 4V step) make these devices excellent choices for a wide variety of video applications. The low differential gain/phase errors (0.03%/0.06°) and wide bandwidth make them ideal for both composite-video and RGB applications. The amplifiers are capable of delivering ±2.5V into back-terminated 50½ or 75½ cables, and they deliver ±2V to a 75 load, allowing multiple cables to be driven from a single output.

For implementation of large switch arrays, MAX498 is a low-power disable mode places the amplifier outputs in a highimpedance state. Channel selection and output enable/disable are controlled by four TTL/CMOScompatible logic inputs. Each video input is isolated by an AC-ground pin, which minimizes channel-to-channel capacitance and reduces crosstalk to 90dB at 10MHz.

The four-channel MAX498 dissipates 390mW (typical) from ±5VDC power supplies with all output buffers enabled. Power consumption is reduced to 130mW with all buffers disabled. The corresponding dissipation for the three-channel MAX499 is 300mW enabled and 100mW disabled.