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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/s), unity-gain-stable buffers capable of driving 400 and 20pF to 1.3V. For applications 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 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/s Slew Rate, Three-State Output Capability, Power-Saving Disable Feature, 35MHz Bandwidth
MAX456
______________Ordering Information
PART MAX456CPL MAX456CQH MAX456C/D TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C PIN-PACKAGE 40 Plastic DIP 44 PLCC Dice*
Ordering Information continued on last page. * Dice are specified at TA = +25C, DC parameters only.
_________________Pin Configurations
TOP VIEW
D1/SER OUT 1 D0/SER IN 2 A2 3 A1 4 IN0 5 A0 6 40 V+ 39 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 29 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
MAX456
OUTPUT SELECT A2 A1 A0 8X8 T-SWITCH MATRIX D3 D2 D1/SER OUT D0/SER IN AV = 2
EDGE/LEVEL 14 IN5 15 V+ 16 IN6 17 SER/PAR 18 IN7 19 V- 20
INPUT SELECT OR SERIAL I/O
MAX470
PLCC 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 = +70C) 40-Pin Plastic DIP (derate 11.3mW/C above +70C)....889mW 40-Pin CERDIP (derate 20.0mW/C above +70C)....1600mW 44-Pin PLCC (derate 13.3mW/C above +70C) .......1066mW Operating Temperature Ranges: MAX456C _ _ ......................................................0C to +70C MAX456E _ _ ...................................................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10 sec) ............................+300C
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 IN +1.3V; LOAD = +5V; internal load resistors on; AGND = DGND = 0V; T A = +25C, unless otherwise noted.) CONDITIONS Internal load resistors on, no external load, VIN = 0V to 1V TA = +25C TA = TMIN to TMAX TA = TMIN to TMAX 4.5 TA = +25C TA = TMIN to TMAX TA = +25C 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 = +25C 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 V/C V mA mA dB nA nA V A V V V UNITS V
TA = +25C
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 IN +1.3V, LOAD = +5V, internal load resistors on, AGND = DGND = 0V, T A = +25C, unless otherwise noted.) PARAMETER DYNAMIC SPECIFICATIONS (Note 1) X 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/s dB dB dB MHz deg % mVRMS pF pF pF
MAX456
SWITCHING CHARACTERISTICS (Note 1)
(Figure 4, V+ = 5.0V, V- = -5.0V, -1.3V V IN +1.3V, 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 tWH 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.
_______________________________________________________________________________________
3
8 x 8 Video Crosspoint Switch MAX456
______________________________________________________________Pin Description
PIN DIP -- 1 2 3, 4, 6 5, 7, 9, 11, 13, 15, 17, 19 8 PLCC 1, 12, 23, 34 2 3 4, 5, 7 6, 8, 10, 13, 15, 17, 19, 21 9 NAME N.C. D1/SER OUT D0/SER IN A2, A1, A0 IN0-IN7 FUNCTION No connect. Not internally connected. --- -- Parallel Data Bit D1 when SER/PAR = 0V. Serial Output for cascading --- -- multiple parts when SER/PAR = 5V. --- -- Parallel Data Bit D0 when SER/PAR = 0V. A Serial Input when --- -- SER/PAR = 5V. Output Buffer Address Lines Video lnput Lines Asynchronous control line. When LOAD = 1, all the 400 internal active loads are on. When LOAD = 0, external 400 loads must be used. The buffers MUST have a resistive load to maintain stability. Digital Ground Pins. Both DGND pins must have the same potential and be bypassed to AGND. DGND should be within 0.3V of AGND. When this control line is high, the 2nd-rank registers are loaded with the rising edge of the LATCH line. If this control line is low, the 2nd-rank registers are transparant when LATCH is low, passing data directly from the 1st-rank registers to the decoders. All V+ pins must be tied to each other and bypassed to AGND separately (Figure 2). 5V = 32-Bit Serial, 0V = 7-Bit Parallel Both V- pins must be tied to each other and bypassed to AGND separately (Figure 2). WRITE in the serial mode, shifts data in. In the parallel mode, WR loads data into the 1st-rank registers. Data is latched on the rising edge. --- -- -- --- If EDGE/LEVEL = 5V, data is loaded from the 1st-rank registers to the 2nd--- -- -- --- rank registers on the rising edge of LATCH. If EDGE/LEVEL = 0V, data is loaded while LATCH = 0V. In addition, data is loaded during the execution of parallel-mode functions 1011 through 1110, or if LATCH = 5V during the execution of the parallel-mode "software-LATCH" command (1111). - ------ ---- -- ------ -- - -- -- Chip Enable. When CE = 0V and CE = 5V, the WR line is enabled. -- -- Chip Enable. When CE = 0V and CE = 5V, the WR line is enabled. Output Buffers 7-0 (Note 1) Analog Ground must be at 0.0V since the gain resistors of the buffers are tied to these 3 pins. --- --- Parallel Data Bit D3 when SER/ PAR = 0V. When D3 = 0V, D0-D2 specifies the input channel to be connected to buffer. When D3 = 5V, then D0-D2 --- --- specify control codes. D3 is not used when SER/ PAR = 5V. --- --- Parallel Data Bit D2 when SER/ PAR = 0V. Not used when --- --- SER/ PAR = 5V.
LOAD
10, 12
11, 14
DGND
14
16
--- -- -- --- EDGE/LEVEL
16, 26, 40 18 20, 34 21
18, 29, 44 20 22, 38 24
V+ --- -- SER/PAR VWR
22
25
LATCH
23 24 25, 27, 29, 31, 33, 35, 37, 39 28, 30, 32
26 27 28, 30, 32, 35, 37, 39, 41, 43 31, 33, 36
-- - CE CE OUT7-OUT0 AGND
36
40
D3
38
42
D2
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. 4 _______________________________________________________________________________________
8 x 8 Video Crosspoint Switch
_______________Detailed Description
Output Buffers
The MAX456 video crosspoint switch consists of 64 T-switches in an 8 x 8 grid (Figure 1). The 8 matrix outputs are followed by 8 wideband buffers optimized for driving 400 and 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 control. When a buffer is disabled, its output enters a highimpedance 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 75 loads must be driven.
___________________Digital Interface
The desired switch state can be loaded in a 7-bit parallel-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/LEVEL is high. Otherwise, the second-rank- registers update while LATCH is low -- --- ---- (when EDGE/LEVEL is low). WR is logically ANDed with --- - CE and C E to allow active-high or active-low chip enable.
MAX456
7-Bit Parallel Mode
In 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.
Power-On RESET
The MAX456 has an internal power-on reset (POR) circuit that remains low for 5s 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 initial condition. The desired switch state should be programmed before the buffer outputs are enabled.
32-Bit Serial-Interface Mode --- --- In serial mode (SER/PAR = 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).
_______________________________________________________________________________________
5
8 x 8 Video Crosspoint Switch MAX456
Table 1. Parallel-Interface Mode Functions
A2-A0 D3-D0 0000 to 0111 1000 1011 Selects Output Buffer, OUT0 to OUT7 1100 1101 1110 FUNCTION Connect the buffer selected by A2-A0 to the input channel selected by D3-D0. Connect the buffer selected by A2-A0 to DGND. Note, if the buffer output is on, its output is its offset voltage. Shut off the buffer selected by A2-A0, and retain 2nd-rank contents. Turn on the buffer selected by A2-A0, or restore the previously connected channel. Turn off all buffers, or leave 2nd-rank registers unchanged. Turn on all buffers, or restore the previously connected channels. Send a pulse to the 2nd-rank registers to load them with the contents of the 1st-rank registers. When latch is held high, this "software-LATCH" command performs the same function as pulsing LATCH low. Do not use these codes in the parallel-interface mode. These codes are for the serialinterface mode only.
1111
1001 and 1010
Table 2. Serial-Interface Mode Functions
D3-D0 0000 to 0111 FUNCTION Connect the selected buffer to the input channel selected by D3-D0. Connect the input of the selected buffer to GND. Note, if the buffer output remains on, its input is its offset voltage. Turn on the selected buffer and connect its input to GND. Use this code to turn on buffers after power is applied. The default power-up state is all buffers disabled. Shut off the selected buffer at the specified channel, and erase data stored in the 2nd rank of registers. The 2nd rank now holds the command word 1010. Do not use these codes in the serial-interface mode. They inhibit the latching of the 2nd-rank registers, which prevents proper data loading.
1000
1001
1010
1011 to 1111
6
_______________________________________________________________________________________
8 x 8 Video Crosspoint Switch MAX456
IN0 IN1 IN2 IN3 IN4 IN5 IN6 IN7 OUTPUT BUFFERS A=1 OUT0
400
MAX456 8x8 SWITCH MATRIX
LOAD
A=1
OUT7
2nd-RANK REGISTERS
LATCH EDGE/LEVEL
400
SER/PAR
1st-RANK REGISTERS V+ A0 A1 A2 D0/SER IN D2 D1/SER OUT D3
WR CE CE V- AGND DGND
Figure 1. MAX456 Functional Diagram
Table 3. Input/Output Line Configurations
SERIAL/ PARALLEL H D3 X D2 X D1 Serial Output Parallel Input Parallel Input D0 Serial Input A2-A0 X Output Buffer Address Output Buffer Address COMMENT 32-Bit Serial Mode
L
H
Parallel Input Parallel Input
Parallel Input Parallel Input
Parallel Mode, D0-D2 = Control Code Parallel Mode, D0-D2 = Input Address
L
L
Note : X = Don't Care, H = 5V, L = 0V _______________________________________________________________________________________ 7
8 x 8 Video Crosspoint Switch MAX456
________________Typical Application
Figure 2 shows a typical application of the MAX456 with MAX470 quad, gain-of-two buffers at the outputs to drive 75 loads. This application shows the MAX456 digital-switch control interface set up in the 7-bit parallel mode. The MAX456 uses 7 data lines and 2 control lines (WR and LATCH). Two additional lines may be needed to control CE and LOAD when using multiple MAX456s. The input/output information is presented to the chip at A2-A0 and D3-D0 by a parallel printer port. The data is stored in the 1st-rank registers on the rising edge of WR. When the LATCH line goes high, the switch configuration is loaded into the 2nd-rank registers, and all 8 outputs enter the new configuration at the same time. Each 7-bit word updates only one output buffer at a time. If several buffers are to be updated, the data is individually loaded into the 1st-rank registers. Then, a single LATCH pulse is used to reconfigure all channels simultaneously. The short Basic program in Figure 3 loads programming data into the MAX456 from any IBM PC or compatible. It uses the computer's "LPT1" output to interface to the circuit, then automatically finds the address for LPT1 and displays a table of valid input values to be used. The program does not keep track of previous commands, but it does display the last data sent to LPT1, which is written and latched with each transmission.
MAX470
5 IN0 7 9 11 13 15 17 19 IN1 IN2 IN3 IN4 IN5 IN6 IN7 OUT0 39 37 35 33 31 29 27 25 24 14 8 40 26 28, 30, 32 10, 12 20 34 23 18 16 +5V 1 IN0 3 IN1 6 IN2 8 IN3 V+ 10 GND OUT0 16 AV = 2 OUT1 14 OUT2 11 OUT3 9 V75
8-INPUT VIDEO CHANNELS
DB-25 14 1 2 3 4 5 6 7 8
22 21
OUT1 OUT2 OUT3 OUT4 MAX456 OUT5 OUT6 OUT7 CE EDGE/LEVEL LOAD LATCH V+ WR V+ AGND DGND VVCE SER/PAR V+
75
2,7,15 4,5,12,13 -5V
+5V
18 19 20 21 22 23 24 25
2 1 38 36 6 4 3
D0/SER IN D1/SER OUT D2 D3 A0 A1 A2
-5V
ALL BYPASS CAPACITORS 0.1F CERAMIC
Figure 2. Typical Application Circuit
8
_______________________________________________________________________________________
8 x 8 Video Crosspoint Switch MAX456
Figure 3. BASIC Program for Loading Data into the MAX456 from a PC Using Figure 2's Circuit
____________________________________________________________Timing Diagrams
A0-A2 VALID DATA N-1 D0-D3 tDS tWL WR tD LATCH tL tWH tDH VALID DATA N
Figure 4. Write Timing for Serial- and Parallel-Interface Modes
_______________________________________________________________________________________ 9
8 x 8 Video Crosspoint Switch MAX456
_______________________________________________Timing Diagrams (continued)
SEE FIGURE 4 FOR WR AND LATCH TIMING
DATA (N) DATA (N + 1) DATA (N + 2)
WR LATCH
FIRST-RANK REGISTER DATA SECOND-RANK REGISTER DATA (EDGE/LEVEL = Low) SECOND-RANK REGISTER DATA (EDGE/LEVEL = High)
DATA (N)
DATA (N + 1)
DATA (N + 2)
DATA (N)
DATA (N + 1)
DATA (N)
DATA (N + 1)
--- --- Figure 5. Parallel-Interface Mode Format (SER/ PAR = Low)
SEE TABLE 2 FOR INPUT DATA INPUT DATA FOR OUT0
INPUT DATA FOR OUT1 TO OUT6
INPUT DATA FOR OUT7
SEE FIGURE 4 FOR WR AND LATCH TIMING
0D3
0D2
0D1
0D0
1D3
1D2
7D3
7D2
7D1
7D0
WR
LATCH
SECOND-RANK REGISTER DATA (EDGE/LEVEL = Low) SECOND-RANK REGISTER DATA (EDGE/LEVEL = High)
DATA VALID
DATA VALID
--- --- Figure 6. 32-Bit Serial-Mode Interface Format (SER/PAR = High)
10
______________________________________________________________________________________
8 x 8 Video Crosspoint Switch
_______________________________________________________Dynamic Test Circuits
IN0 IN1 IN2 OUT0 OUT1 OUT2 VOUT IN0 IN1 IN2 OUT0 OUT1 OUT2 VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT +5V
MAX456
IN3 MAX456 OUT3 IN4 IN5 IN6 IN7 OUT4 OUT5 OUT6 OUT7 LOAD VIN = 2Vp-p, SWEEP FREQUENCY RS = 75 +5V
IN3 MAX456 OUT3 IN4 IN5 IN6 IN7 OUT4 OUT5 OUT6 OUT7 LOAD VIN = 2Vp-p @ 5MHz RS = 75
-3dB Bandwidth (Notes 1-4)
All-Channel Off Isolation (Notes 1, 5-8)
IN0 IN1 IN2
OUT0 OUT1 OUT2
VOUT VOUT VOUT VOUT VOUT VOUT VOUT 75
IN0 IN1 IN2
OUT0 OUT1 OUT2
VOUT
7x
75
IN3 MAX456 OUT3 IN4 IN5 IN6 IN7 OUT4 OUT5 OUT6 OUT7 LOAD VIN = 2Vp-p @ 5MHz RS = 75
IN3 MAX456 OUT3 IN4 IN5 IN6 IN7 OUT4 OUT5 OUT6 OUT7 LOAD VIN = 2Vp-p @ 5MHz RS = 75 +5V
+5V
Single-Channel Crosstalk (Notes 1, 5, 9-11)
Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: Note 10: Note 11: Note 12:
All-Channel Crosstalk (Notes 1, 5, 9, 11, 12)
Connect LOAD (pin 8) to +5V (internal 400 loads on at all outputs). Program any one input to connect to any one output (see Table 1 or 2 for programming codes). Turn on buffer at the selected output (see Table 1 or 2). Drive the selected input with VIN, and measure VOUT at the -3dB frequency at the selected output. Program each numbered input to connect to the same numbered output (IN0 to OUT0, IN1 to OUT1, etc.). See Table 1 or 2 for programming codes. Turn off all output buffers (see Table 1 or 2). Drive all inputs with VIN and measure VOUT at any output. Isolation (in dB) = 20log10 (VOUT/VIN). Turn on all output buffers (see Table 1 or 2). Drive any one input with VIN and measure VOUT at any undriven output. Crosstalk (in dB) = 20log10 (VOUT/VIN). Drive all but one input with VIN and measure VOUT at the undriven output.
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11
8 x 8 Video Crosspoint Switch MAX456
____Pin Configurations (continued)
D1/SER OUT D0/SER IN
__Ordering Information (continued)
PART MAX456EPL MAX456EQH MAX456EJL TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 40 Plastic DIP 44 PLCC 40 CERDIP
TOP VIEW
IN0 A1 A2
OUT0
OUT1
N.C.
D2
6
5
4
3
2
1
44 43 42 41 40
A0 IN1 LOAD
D3
V+
7 8 9
39 38 37 36
OUT2 VOUT3 AGND N.C. AGND OUT5 AGND OUT6 V+ OUT4
___________________Chip Topography
IN2 10 DGND 11 N.C. 12 IN3 13 DGND 14 IN4 15 EDGE/LEVEL 16 IN5 17
18 19 20 21 22 23 24 25 26 27 28
34 33 32 31 30 29
IN5 EDGE/LEVEL IN4 DGND IN3 DGND IN2 LOAD IN1 V+ IN6 SER/PAR IN7 VWR LATCH CE CE OUT7
MAX456
35
AO IN0 A1 A2 D0/SER IN D1/SER OUT V+ 0.167" OUT0 (4.242mm) D2 OUT1 D3
IN6
IN7
V-
CE
SER/PAR
N.C.
WR
LATCH
CE
V+
PLCC
OUT7
TRANSISTOR COUNT: 3820; SUBSTRATE CONNECTED TO V+.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1994 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
OUT6 AGND OUT5 AGND OUT4 AGND OUT3 VOUT2 0.184" (4.674mm)
V+

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