MAX4221CSE View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX4221CSE

330MHz Buffered Video Switches/Crosspoint Building Blocks

Maxim Integrated 

330MHz Buffered Video Switches/

Crosspoint Building Blocks

______________________________________________________________Pin Description

PIN

MAX4111 MAX4121 MAX4221

NAME

1, 3

3

2, 4, 5, 7

GND

—

1

—

A0

2

—

—

IN

—

2, 4

1, 3

IN0, IN1

4

—

—

N.C.

5

5

12

VEE

6

6

—

OUT

—

—

6, 8

IN2, IN3

7

7

14

VCC

8

8

—

EN

—

—

9, 10

SEL3,

SEL2

—

—

11, 13

OUT1,

OUT0

—

—

15, 16

SEL1,

SEL0

FUNCTION

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.

_______________Detailed Description

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.

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.

_______________________________________________________________________________________ 7

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