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Part: MAX456C/D
Category:
Multimedia
-> Audio/Video
Description: MAX456 8x8 Crosspoint Video Switch
Company: Maxim Integrated Products
Datasheet: Download MAX456C/D datasheet File size : 309 kB
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Datasheet text preview:
19-2858; Rev 2; 2/94
8 x 8 Video Crosspoint Switch
_______________General Description
The 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, output channels. Each matrix output connects to eight internal, high-speed (250V/µs), unity-gain-stable buffers capable of driving 400 and 20pF to ±1.3V. For applic a t i o n s requiring increased drive capability, the M A X 4 5 6 outputs can be connected directly to two MAX470 quad, gain-of-two video buffers, which are capable of driving 75 loads. Three-state output capability and internal, programmable 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 simplified 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.
____________________________Features
o o o o o o 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 Bandwidth
MAX456
______________Ordering Information
PART MAX456CPL MAX456CQH MAX456C/D TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C PIN-PACKAGE 40 Plastic DIP 44 PLCC Dice*
Ordering Information continued on last page. * Dice are specified at TA = +25°C, DC parameters only.
_________________Pin Configurations
T O P VIEW
D 1 / S E R OUT 1 D 0 / S E R IN 2 A2 3 A1 4 IN0 5 A0 6 40 V+ 3 9 OUT0 38 D2
________________________Applications
Video Test Equipment Video Security Systems Video Editing
MAX456
37 OUT1 36 D3 35 OUT2 34 V33 OUT3 32 AGND 31 OUT4 30 AGND 2 9 OUT5 28 AGND 27 OUT6 26 V+ 25 OUT7 24 CE 23 CE 22 LATCH 21 WR
________Typical Application Circuit
8 INPUT CHANNELS
IN1 7
MAX470 AV = 2
WR LATCH
LOAD 8
75
IN2 9 DGND 10
75
IN3 11 DGND 12 IN4 13
AX456
OUTPUT S ELECT A2 A1 A0 8X8 T-SWITCH M ATRIX D3 D2 D1/SER OUT D0/SER IN M AV = 2
EDGE/LEVEL 14 IN5 15 V+ 16 IN6 17 SER/PAR 1 8 IN7 19 V- 20
S INPUT ELEO T C S R ERIIAL /O
MAX470
P L C C on last page
DIP 1
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
8 x 8 Video Crosspoint Switch MAX456
ABSOLUTE MAXIMUM RATINGS
Total 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
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.
ELECTRICAL CHARACTERISTICS
PARAMETER Input Voltage Range Voltage Gain
( V + = 5.0V, V- = -5.0V, -1.3V V I N + 1 . 3 V ; LOAD = +5V; internal load resistors on; AGND = DGND = 0V; T A = +25°C, unless otherwise noted.) CONDITIONS Internal load resistors on, no external load, VIN = 0V to 1V TA = +25°C TA = TMIN to TMAX TA = TMIN to TMAX ±4.5 TA = +25°C TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX ±4.5V to ±5.5V, DC measurement TA = TMIN to TMAX Internal load resistors off, all buffers off, TA = TMIN to TMAX TA = +25°C TA = TMIN to TMAX Internal load resistors on, no external load TA = TMIN to TMAX 10 0.8 2.4 Serial mode, -- -- SER/PAR = 5V IOL = 1.6mA IOH = -0.4mA 4 0.4 50 64 ±0.1 ±10 ±100 250 200 ±1.3 ±1 400 600 765 1.5 39 20 ±5.5 45 60 3.0 4 MIN -1.3 0.99 0.98 TYP MAX 1.3 1.01 V/V TA = TMIN to TMAX 1.0 1.02 ±7 ±12 mV µV/°C V mA mA dB nA nA V µA V V V UNITS V
TA = +25°C
1.0
Buffer Offset Voltage Offset Voltage Drift Operating Supply Voltage Supply Current, All Buffers On (No External Load) Supply Current, All Buffers Off Power-Supply Rejection Ratio Analog Input Current Output Leakage Current Internal Amplifier Load Resistor (LOAD Pin = 5V) Buffer Output Voltage Swing Digital Input Current Output Impedance at DC Input Logic Low Threshold Input Logic High Threshold SER OUT Output Logic Low SER OUT Output Logic High
2
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8 x 8 Video Crosspoint Switch
ELECTRICAL CHARACTERISTICS
( V + = 5.0V, V- = -5.0V, -1.3V V I N + 1 . 3 V , LOAD = +5V, internal load resistors on, AGND = DGND = 0V, T A = +25°C, unless otherwise noted.) PARAMETER D X YNAMIC SPECIFICATIONS (Note 1) Output-Buffer Slew Rate Single-Channel Crosstalk All-Channel Crosstalk All-Channel Off Isolation -3dB Bandwidth Differential Phase Error Differential Gain Error Input Noise Input Capacitance Buffer Input Capacitance Output Capacitance CONDITIONS Internal load resistors on, 10pF load 5MHz, VIN = 2VP-P (Note 2) 5MHz, VIN = 2VP-P (Notes 2, 3) 5MHz, VIN = 2VP-P (Note 2) 10pF load, VIN = 2VP-P (Note 2) (Note 4) (Note 4) DC to 40MHz All buffer inputs grounded Additional capacitance for each output buffer connected to channel input Output buffer off 25 60 MIN TYP 250 70 57 80 35 1.0 0.5 0.3 6 2 7 1.0 MAX UNITS V/µs dB dB dB MHz deg % mVRMS pF pF pF
MAX456
SWITCHING CHARACTERISTICS (Note 1)
( F i g u r e 4, V+ = 5.0V, V- = -5.0V, -1.3V V I N + 1 . 3 V , LOAD = +5V, internal load resistors on, AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER Chip-Enable to Write Setup Write Pulse Width High Write Pulse Width Low Data Setup Data Hold Latch Pulse Width Latch Delay Switch Break-Before-Make Delay LATCH Edge to Switch Off LATCH Edge to Switch On Note 1: Note 2: Note 3: Note 4: SYMBOL tCE tW H tWL tDS tDH tL tD tON - tOFF tOFF tON LATCH on Parallel mode 32-bit serial mode CONDITIONS MIN 0 80 80 240 160 0 80 80 15 35 50 TYP MAX UNITS ns ns ns ns ns ns ns ns ns ns
Guaranteed by design. See Dynamic Test Circuits on page 11. 3dB typical crosstalk improvement when RS = 0. 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.
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