MAX4121CSA MAXIM [Maxim Integrated Products], MAX4121CSA Datasheet - Page 7

• Manufacturer Part Number: MAX4121CSA
• Description: 330MHz Buffered Video Switches/ Crosspoint Building Blocks
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX4111/MAX4121/MAX4221 video switches are
manufactured with Maxim’s proprietary, ultra-high fre-
quency, complementary bipolar process that yields
high bandwidth and low capacitance. Make-before-
break switching is used to reduce noise and glitches,
even when switching from part to part in large arrays.
The input buffers provide a constant high input imped-
ance, and prevent the make-before-break action from
feeding back to the input.
_______________Detailed Description
______________________________________________________________Pin Description
MAX4111
1, 3
—
—
—
—
—
—
2
4
5
6
7
8
MAX4121
PIN
2, 4
—
—
—
—
—
—
3
1
5
6
7
8
_______________________________________________________________________________________
MAX4221
2, 4, 5, 7
11, 13
15, 16
9, 10
1, 3
6, 8
12
14
—
—
—
—
—
330MHz Buffered Video Switches/
IN0, IN1
IN2, IN3
OUT1,
NAME
SEL3,
OUT0
SEL1,
SEL2
SEL0
GND
OUT
N.C.
V
V
EN
A0
IN
CC
EE
Analog (signal) ground. Since inputs are isolated by these grounds, GND
should be as noise-free as possible.
Logic Input. Channel Selection Bit for the 2x1. See Table 2.
Signal Input
Signal Input
No Connect—not internally connected
Negative Power-Supply Voltage. Connect to -5V. Decouple to power ground.
Signal Output
Signal Inputs for the dual 2x1 switch
Positive Power-Supply Voltage. Connect to +5V. Decouple to power ground.
Logic Input. Output Enable for the 1x1, 2x1 switches. A logic high on this
pin enables the output. A logic low causes the output to assume a high-
impedance state, and reduces supply current.
Logic Inputs. Channel Selection Bits for OUT1 of the dual 2x1 (MAX4221).
See Table 3.
Signal Outputs
Logic Inputs. Channel Selection Bits for OUT0 of the dual 2x1 (MAX4221). See
Table 3.
Crosspoint Building Blocks
The design of the switching mechanism limits the
inevitable glitch to less than 13mVp-p. In addition, the
glitch pulse is positive to avoid confusion with negative
sync pulses.
Unity-gain buffers isolate other inputs from the switch-
ing action of large multiplex arrays. These buffers can
drive 5kΩ resistive loads. In addition, these devices
drive capacitive loads without oscillation. Load capaci-
tance is limited only by system bandwidth require-
ments.
The MAX4111/MAX4121/MAX4221 do not contain
buffer latches. The digital inputs are transparent.
FUNCTION
7