Features: Routes Any Input Channel to Any Output Channel
Switches Standard Video Signals
Serial or Parallel Digital Interface
Expandable for Larger Switch Matrices
80dB All-Channel Off Isolation at 5MHz
8 Internal Buffers with:
250V/µs Slew Rate, Three-State Output Capability,
Power-Saving Disable Feature, 35MHz BandwidthApplicationVideo Test Equipment
Video Security Systems
Video EditingPinout
SpecificationsTotal Supply Voltage (V+ to V-).............................................+12V
Positive Supply Voltage V+ Referred to AGND.........-0.3V to +12V
Negative Supply Voltage V- Referred to AGND........-12V to +0.3V
DGND Voltage............................................................AGND ±0.3V
Buffer Short Circuit to Ground when
Not Exceeding Package Power Dissipation....................Indefinite
Analog Input Voltage.............................(V+ + 0.3V) to (V- - 0.3V)
Digital Input Voltage..............................(V+ + 0.3V) to (V- - 0.3V)
Input Current, Power On or Off
Digital Inputs....................................................................±20mA
Analog Inputs...................................................................±50mA
Continuous Power Dissipation (TA= +70°C)
40-Pin Plastic DIP (derate 11.3mW/°C above +70°C)....889mW
40-Pin CERDIP (derate 20.0mW/°C above +70°C).......1600mW
44-Pin PLCC (derate 13.3mW/°C above +70°C)..........1066mW
Operating Temperature Ranges:
MAX456C _ _........................................................0°C to +70°C
MAX456E _ _.....................................................-40°C to +85°C
Storage Temperature Range...........................-65°C to +160°C
Lead Temperature (soldering, 10 sec)...........................+300°C
DescriptionThe MAX456 is the first monolithic CMOS 8 x 8 video crosspoint switch that significantly reduces component count, board space, and cost. The crosspoint switch contains a digitally controlled matrix of 64 T-switches that connect eight video input signals to any, or all, out- put channels. Each matrix output connects to eight internal, high-speed (250V/µs), unity-gain-stable buffers capable of driving 400 Ω and 20pF to ±1.3V. For appli- cations requiring increased drive capability, the MAX456 outputs can be connected directly to two MAX470 quad, gain-of-two video buffers, which are Ωloads.
Three-state output capability and internal, programma- ble active loads make it feasible to parallel multiple MAX456s and form larger switch matrices. In the 40-pin DIP package, crosstalk (70dB at 5MHz) is minimized, and board area and complexity are simpli- fied by using a straight-through pinout. The analog inputs and outputs are on opposite sides, and each channel is separated by a power-supply line or quiet digital logic line.
MAX456 Data Sheet
