MAX456CPL ,8 x 8 Video Crosspoint SwitchFeaturesThe MAX456 is the first monolithic CMOS 8 x 8 video ' Routes Any Input Channel to Any Outpu ..
MAX456CPL ,8 x 8 Video Crosspoint SwitchMAX45619-2858; Rev 2; 2/948 x 8 Video Crosspoint Switch_______________
MAX456CPL+ ,8x8 Crosspoint Video SwitchFeaturesThe MAX456 is the first monolithic CMOS 8 x 8 video ♦ Routes Any Input Channel to Any Outpu ..
MAX456CQH ,8 x 8 Video Crosspoint SwitchApplicationsD1/SER OUT V+ 140Video Test EquipmentD0/SER IN2 OUT039Video Security SystemsA23 D238Vid ..
MAX456EPL ,8 x 8 Video Crosspoint SwitchELECTRICAL CHARACTERISTICS(V+ = 5.0V, V- = -5.0V, -1.3V ≤ V ≤ +1.3V; LOAD = +5V; internal load resi ..
MAX456EPL+ ,8x8 Crosspoint Video SwitchApplicationsD1/ SER OUT V+ 140Video Test EquipmentD0/ SER IN2 OUT039Video Security SystemsA23 D238V ..
MAX866EUA+ ,3.3V/5V or Adjustable-Output / Single-Cell DC-DC ConvertersApplicationsPART TEMP. RANGE PIN-PACKAGEPagers MAX866C/D 0°C to +70°C Dice*Remote Controls MA ..
MAX8677AETG+ ,1.5A Dual-Input, USB/AC Adapter Charger and Smart Power SelectorFeaturesThe MAX8677A is an integrated 1-cell Li+ charger and♦ Complete Charger and Smart Power Sele ..
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MAX8677CETG , 1.5A Dual-Input USB/AC Adapter Charger and Smart Power Selector
MAX8677CETG+ ,1.5A Dual-Input USB/AC Adapter Charger and Smart Power SelectorApplications+Denotes a lead-free package.PDAs, Palmtops, and Wireless Handhelds**EP = Exposed paddl ..
MAX8677CETG+T ,1.5A Dual-Input USB/AC Adapter Charger and Smart Power SelectorFeaturesThe MAX8677C is an integrated 1-cell Li+ charger and♦ Complete Charger and Smart Power Sele ..
MAX456CPL-MAX456CQH-MAX456EPL
8 x 8 Video Crosspoint Switch
_______________General 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 400Ωand 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
capable of driving 75Ωloads.
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.
________________________ApplicationsVideo Test Equipment
Video Security Systems
Video Editing
____________________________FeaturesRoutes Any Input Channel to Any Output ChannelSwitches Standard Video SignalsSerial or Parallel Digital InterfaceExpandable for Larger Switch Matrices80dB All-Channel Off Isolation at 5MHz8 Internal Buffers with:
250V/µs Slew Rate, Three-State Output Capability,
Power-Saving Disable Feature, 35MHz Bandwidth
______________Ordering Information
Ordering Information continued on last page.* Dice are specified at TA= +25°C, DC parameters only.
MAX456
8 x 8 Video Crosspoint Switch
________________________________________________________________Maxim Integrated Products1
_________________Pin Configurations
________Typical Application Circuit
Call toll free 1-800-998-8800 for free samples or literature.19-2858; Rev 2; 2/94
MAX456
8 x 8 Video Crosspoint Switch_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGSTotal 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
ELECTRICAL CHARACTERISTICS(V+ = 5.0V, V- = -5.0V, -1.3V ≤VIN≤+1.3V; LOAD = +5V; internal load resistors on; AGND = DGND = 0V; TA= +25°C,unless otherwise noted.)
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.
Note 1:Guaranteed by design.
Note 2:See Dynamic Test Circuitson page 11.
Note 3:3dB typical crosstalk improvement when RS = 0Ω.
Note 4:Input test signal: 3.58MHz sine wave of amplitude 40IRE superimposed on a linear ramp (0 to 100IRE). IRE is a unit of
video-signal amplitude developed by the International Radio Engineers. 140IRE = 1.0V.
MAX456
8 x 8 Video Crosspoint Switch
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS(V+ = 5.0V, V- = -5.0V, -1.3V ≤VIN≤+1.3V, LOAD = +5V, internal load resistors on, AGND = DGND = 0V, TA= +25°C,
unless otherwise noted.)
SWITCHING CHARACTERISTICS (Note 1)(Figure 4, V+ = 5.0V, V- = -5.0V, -1.3V ≤VIN≤+1.3V, LOAD = +5V, internal load resistors on, AGND = DGND = 0V,
TA = TMINto TMAX, unless otherwise noted.)
MAX456
8 x 8 Video Crosspoint Switch_______________________________________________________________________________________
______________________________________________________________Pin Description
Note 1:Buffer inputs are internally grounded with a 1000 or 1001 command from the D3-D0 lines. AGND must be at 0.0V since the
gain setting resistors of the buffers are internally tied to AGND.
MAX456
8 x 8 Video Crosspoint Switch
_______________________________________________________________________________________5
_______________Detailed Description
Output BuffersThe MAX456 video crosspoint switch consists of 64
T-switches in an 8 x 8 grid (Figure 1). The 8 matrix out-
puts are followed by 8 wideband buffers optimized for
driving 400Ωand 20pF loads. Each buffer has an
internal active load on the output that can be readily
shut off via the LOAD input (off when LOAD = 0V). The
shut-off is useful when two or more MAX456 circuits are
connected in parallel to create more input channels.
With more input channels, only one set of buffers can
be active and only one set of loads can be driven.
And, when active, the buffer must have either
1) an internal load, 2) the internal load of another buffer
in another MAX456, or 3) an external load.
Each MAX456 output can be disabled under logic con-
trol. When a buffer is disabled, its output enters a high-
impedance state. In multichip parallel applications, the
disable function prevents inactive outputs from loading
lines driven by other devices. Disabling the inactive
buffers reduces power consumption.
The MAX456 outputs connect easily to MAX470 quad,
gain-of-two buffers when 75Ωloads must be driven.
Power-On RESETThe MAX456 has an internal power-on reset (POR) cir-
cuit that remains low for 5µs when power is applied.
POR also remains low if the total supply voltage is less
than 4V. The POR disables all buffer outputs at
power-up, but the switch matrix is not preset to any ini-tial condition. The desired switch state should be pro-
grammed before the buffer outputs are enabled.
___________________Digital InterfaceThe desired switch state can be loaded in a 7-bit paral-
lel-interface mode or 32-bit serial-interface mode (see
Table 3 and Figures 4-6). All action associated with the
WR line occurs on its rising edge. The same is true for
the LATCH line if EDGE/–L—E—V—E—L–is high. Otherwise, the
second-rank registers update while LATCH is low
(when EDGE/–L—E—V—E—L–is low). WR is logically ANDed with
CE and –C—E–to allow active-high or active-low chip
enable.
7-Bit Parallel ModeIn the parallel-interface mode, the 7 data bits A2-A0
and D3-D0 specify an output channel (A2-A0) and the
input channel to which it connects (D3-D0). The data is
loaded on the rising edge of WR. The 8 input channels
are selected by 0000 through 0111 (D3-D0). The
remaining 8 codes (1000-1111) control other MAX456
functions, as listed in Table 1.
32-Bit Serial-Interface ModeIn serial mode (SER/–P—A—R–= high), all first-rank registers
are loaded with data, making it unnecessary to specify
an output address (A2, A1, A0). The input data format
is D3-D0, starting with OUT0 and ending with OUT7 for
32 total bits. Only codes 0000 through 1010 are valid.
Code 1010 disables a buffer, while code 1001 enables
it. After data is shifted into the 32-bit first-rank register,
it is transferred to the second rank by the LATCH line
(see Table 2).
8 x 8 Video Crosspoint Switch
MAX456_______________________________________________________________________________________
Table 1. Parallel-Interface Mode Functions
Table 2. Serial-Interface Mode Functions
