19-1389; Rev 2; 2/07
Low-Cost 4x4, 8x4, 8x8
Video Crosspoint Switches
General Description
The MAX4359/MAX4360/MAX4456 low-cost video cross-
point switches are designed to reduce component count,
board space, design time, and system cost. Each con-
tains a matrix of T-switches that connect any of their four
(MAX4359) or eight (MAX4360/MAX4456) video inputs to
any of their buffered outputs, in any combination. Each
matrix output is buffered by an internal, high-speed
(250V/µs), unity-gain amplifier that is capable of driving
400Ω and 20pF at 2.6V
P-P
. For applications requiring
increased drive capability, buffer the MAX4359/
MAX4360/MAX4456 outputs with the MAX4395 quad,
operational amplifier.
The MAX4456 has a digitally controlled 8x8 switch matrix
and is a low-cost pin-for-pin compatible alternative to the
popular MAX456. The MAX4359/MAX4360 are similar to
the MAX4456, with the 8x8 switch matrix replaced by a
4x4 (MAX4359) or an 8x4 (MAX4360) switch matrix.
Three-state output capability and internal, programmable
active loads make it feasible to parallel multiple devices
to form larger switch arrays. The inputs and outputs are
on opposite sides, and a quiet power supply or digital
input line separates each channel, which reduces
crosstalk to -70dB at 5MHz. For applications demanding
better DC specifications, see the MAX456 8x8 video
crosspoint switch.
Features
♦
Eight (MAX4456) or Four (MAX4359/MAX4360)
Internal Buffers
250V/µs Slew Rate
Three-State Output Capability
Power-Saving Disable Feature
65MHz -3dB Bandwidth
♦
Routes Any Input Channel to Any Output Channel
♦
Serial or Parallel Digital Interface
♦
Expandable for Larger Switch Matrices
♦
80dB All-Channel Off-Isolation at 5MHz
♦
70dB Single-Channel Crosstalk
♦
Straight-Through Pinouts Simplify Layout
♦
Low-Cost Pin-Compatible Alternative to
MAX456 (MAX4456)
MAX4359/MAX4360/MAX4456
Ordering Information
PART
MAX4359EAX
MAX4359EWG
MAX4360EAX
MAX4456CPL
MAX4456CQH
MAX4456EPL
MAX4456EQH
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
36 SSOP
24 SO
36 SSOP
40 Plastic DIP
44 PLCC
40 Plastic DIP
44 PLCC
PKG
CODE
A36-2
W24-2
A36-2
P40-1
Q44-1
P40-1
Q44-1
________________________
Applications
High-Speed Signal
Routing
Video-On-Demand
Systems
Video Test Equipment
Video Conferencing
Security Systems
Pin Configurations appear at end of data sheet.
_________________________________________________
Typical Application Circuits
8 INPUT CHANNELS
A
V
= +2
MAX4395
WR
LATCH
Z
0
= 75Ω
4 INPUT CHANNELS
(8 INPUT CHANNELS)
(MAX4360)
A
V
= +2
MAX4395
75Ω
WR
LATCH
75Ω
Z
0
= 75Ω
75Ω
MAX4456
A2
A1
A0
8x8
T-SWITCH
MATRIX
D3
D2
D1/SER OUT
D0/SER IN
MAX4395
A
V
= +2
OUTPUT
SELECT
MAX4359
(MAX4360)
OUTPUT
SELECT
A1
A0
4x4
(8x4)
T-SWITCH
MATRIX
75Ω
INPUT
SELECT
OR
SERIAL
I/O
INPUT
SELECT
OR
SERIAL
I/O
D3
D2
D1/SER OUT
D0/SER IN
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Cost 4x4, 8x4, 8x8
Video Crosspoint Switches
MAX4359/MAX4360/MAX4456
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 to 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 (T
A
= +70°C)
36-Pin SSOP (derate 11.8mW/°C above +70°C) ...........941mW
24-Pin SO (derate 11.8mW/°C above +70°C)................941mW
40-Pin Plastic DIP (derate 11.3mW/°C above +70°C)....889mW
44-Pin PLCC (derate 13.3mW/°C above +70°C) .......1066mW
Operating Temperature Ranges
MAX4456C _ _ ....................................................0°C to +70°C
MAX4_ _ _E_ _ .................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+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.
DC ELECTRICAL CHARACTERISTICS
(V+ = +5V, V- = -5V, V
LOAD
= +5V (internal load resistors on), V
IN_
= V
AGND
= V
DGND
= 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.)
PARAMETER
Operating Supply Voltage
Input Voltage Range
Voltage Gain
Buffer Offset Voltage
Offset Voltage Drift
MAX4359/MAX4360
Supply Current, All Buffers On
(no external load)
MAX4456
Supply Current, All Buffers Off
Power-Supply Rejection Ratio
Analog Input Current
Output Leakage Current
Internal Amplifier Load Resistor
Buffer Output Voltage Swing
Digital Input Current
Output Impedance at DC
Input-Logic Low Threshold
Input-Logic High Threshold
SER OUT Output-Logic Low/High
Serial mode,
V
SER/PAR
= 5V
I
OL
= 0.4mA
I
OH
= -0.4mA
4
2.4
0.4
10
0.8
Internal load resistors off, all buffers off
V
LOAD
= 5V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
250
200
±1.3
±1
400
±4.5V to ±5.5V
50
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
1.6
64
±0.1
±100
±100
600
765
39
CONDITIONS
Inferred from PSRR test
Inferred from swing test
Internal load resistors on,
no external load, V
IN
= 0 to 1V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
20
20
32
37
50
65
5
mA
dB
nA
nA
Ω
V
µA
Ω
V
V
V
mA
T
A
= +25°C
T
A
= T
MIN
to T
MAX
MIN
±4.5
-1.3
0.99
0.98
1.0
1.0
±1
TYP
MAX
±5.5
1.3
1.01
1.02
±15
±20
UNITS
V
V
V/V
mV
µV/°C
Internal load resistors on, no external load
2
_______________________________________________________________________________________
Low-Cost 4x4, 8x4, 8x8
Video Crosspoint Switches
AC ELECTRICAL CHARACTERISTICS
(V+ = +5V, V- = -5V, V
LOAD
= +5V (internal load resistors on), V
AGND
= V
DGND
= 0V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
DYNAMIC SPECIFICATIONS
X
Output-Buffer Slew Rate
Single-Channel Crosstalk
All-Hostile Crosstalk
All-Channel Off-Isolation
-3dB Bandwidth
Small-Signal -3dB Bandwidth
0.1dB Bandwidth
Differential Phase Error
Differential Gain Error
Input Noise
Input Capacitance
Buffer Input Capacitance
Output Capacitance
Internal load resistors on, 10pF load
5MHz, V
IN
= 2V
P-P
(Note 1)
5MHz, V
IN
= 2V
P-P
(Notes 1, 2)
5MHz, V
IN
= 2V
P-P
(Note 1)
10pF load, V
IN
= 2V
P-P
(Note 1)
10pF load, V
IN
= 100mV
P-P
(Note 1)
10pF load, V
IN
= 100mV
P-P
(Note 1)
(Note 3)
(Note 3)
DC to 40MHz
All buffer inputs grounded
Additional capacitance for each output buffer
connected to channel input
Output buffer off
250
70
57
80
35
65
4
1.0
0.5
0.3
6
2
7
V/µs
dB
dB
dB
MHz
MHz
MHz
degrees
%
mV
RMS
pF
pF
pF
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4359/MAX4360/MAX4456
SWITCHING CHARACTERISTICS
(Figure 4, V+ = +5V, V- = -5V, V
LOAD
= +5V (internal load resistors on), V
IN_
= V
AGND
= V
DGND
= 0V, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at T
A
= +25°C.) (Note 4)
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
SYMBOL
t
CE
t
WH
t
WL
t
DS
t
DH
t
L
t
D
t
ON -
t
OFF
t
OFF
t
ON
LATCH on
Parallel mode
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
Note 1:
See
Dynamic Test Circuits
section.
Note 2:
3dB typical crosstalk improvement when R
S
= 0.
Note 3:
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.
Note 4:
Guaranteed by design.
_______________________________________________________________________________________
3
Low-Cost 4x4, 8x4, 8x8
Video Crosspoint Switches
MAX4359/MAX4360/MAX4456
Pin Description
PIN
MAX4359
SO
1
2
3, 5
4, 6, 8, 10
SSOP
1
2
3, 5
4, 6, 8, 10
MAX4360
SSOP
1
2
3, 5
4, 6, 8, 10,
12, 14, 16,
18
MAX4456
DIP
1
2
3, 4, 6
PLCC
2
3
4, 5, 7
D1/
SER OUT
D0/SER IN
A_
IN_
Parallel Data Bit D1 when SER/PAR = GND. Serial out-
put for cascading multiple parts when SER/PAR = V
CC
.
Parallel Data Bit D0 when SER/PAR = GND. Serial
input when SER/PAR = V
CC
.
Output Buffer Address Lines
Video Input Lines
Asynchronous Control Line. When LOAD = V
CC
, all the
400Ω internal active loads are on. When LOAD = GND,
external 400Ω loads must be used. The buffers
must
have a resistive load to maintain stability.
Digital Ground. 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 LATCH. If this con-
trol line is low, the 2nd-rank registers are transparent
when LATCH is low, passing data directly from the
1st-rank registers to the decoders.
No connection. Not internally connected.
Connect to V
CC
for serial mode; connect to GND for
parallel mode.
Negative Supply. All V- pins must be connected to each
other and bypassed to GND separately (Figure 2).
In serial mode, WR (write) shifts data into the input regis-
ter. In parallel mode, WR loads data into the 1st-rank
registers. Data is latched on the rising edge.
If EDGE/LEVEL = V
CC
, data is loaded from the 1st-
rank registers to the 2nd-rank registers on the rising
edge of LATCH. If EDGE/LEVEL = GND, data is
loaded while LATCH = GND. In addition, data is
loaded during the execution of parallel-mode func-
tions 1011 through 1110, or if LATCH = V
CC
during
the execution of the parallel-mode “software-latch”
command (1111).
NAME
FUNCTION
5, 7, 9, 11, 6, 8, 10, 13,
13, 15, 17, 15, 17, 19,
19
21
7
7
7
8
9
LOAD
9
9
9
10, 12
11, 14
DGND
11
11
11
14
16
EDGE/
LEVEL
—
12
13
12–16, 18,
22–26
17
19, 30
22–26
17
19, 30
—
18
20, 34
1, 12, 23,
34
20
22, 38
N.C.
SER/PAR
V-
14
20
20
21
24
WR
15
21
21
22
25
LATCH
4
_______________________________________________________________________________________
Low-Cost 4x4, 8x4, 8x8
Video Crosspoint Switches
Pin Description (continued)
PIN
MAX4359
SO
—
SSOP
—
MAX4360
SSOP
—
MAX4456
DIP
23
PLCC
26
CE
Active-Low Chip Enable. WR is enabled when
CE
= GND and CE = V
CC
. WR is disabled when
CE
= V
CC
and CE = GND.
Active-High Chip Enable. WR is enabled when
CE
= GND and CE = V
CC
. WR is disabled when
CE
= V
CC
and CE = GND.
Buffer Outputs. Buffer inputs are internally grounded with
a 1000 or 1001 command from the D3–D0 lines.
Analog Ground. AGND must be at 0.0V, since the gain-
setting resistors of the buffers are connected to these
pins.
Parallel Data Bit when SER/PAR = GND. When
D3 = GND, D0–D2 specify the input channel to be con-
nected to specified buffer. When D3 = V
CC
, D0–D2
specify control codes. D3 is not used in serial mode
(SER/PAR = V
CC
).
Parallel Data Bit D2 when SER/PAR = GND. Not used
when SER/PAR = V
CC
.
Positive Supply. All V+ pins must be connected to each
other and bypassed to AGND separately (Figure 2).
NAME
FUNCTION
MAX4359/MAX4360/MAX4456
16
27
27
24
25, 27, 29,
31, 33, 35,
37, 39
28, 30, 32
27
28, 30, 32,
35, 37, 39,
41, 43
31, 33, 36
CE
17, 19, 21,
23
28, 31, 33,
35
28, 31, 33,
35
OUT_
18
29
15, 29
AGND
20
32
32
36
40
D3
22
24
34
36
34
13, 36
38
16, 26, 40
42
18, 29, 44
D2
V+
_______________________________________________________________________________________
5
测评中心专版
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
