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INDUSTRIALTEMPERATURERANGE

IDT74FST6800

10-BIT BUS SWITCH WITH PRECHARGED OUTPUTS

APRIL 2015

INDUSTRIAL TEMPERATURE RANGE

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

© 2015 Integrated Device Technology, Inc.

DSC-5519/5

FEATURES:

• Bus switches provide zero delay paths

• Low switch on-resistance: 7

Ω

Ω

Ω

Ω

Ω

• TTL-compatible input and output levels

• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using

machine model (C = 200pF, R = 0)

• Available in QSOP and TSSOP packages

FUNCTIONAL BLOCK DIAGRAM

QSOP / TSSOP

TOP VIEW

PIN CONFIGURATION

IDT74FST6800

10-BIT BUS SWITCH

WITH PRECHARGED

OUTPUTS

DESCRIPTION:

TheFST6800belongstoIDT'sfamilyofBusswitches. Busswitchdevices

perform the function of connecting or isolating two ports without providing

any inherent current sink or source capability. Thus they generate little or

no noise of their own while providing a low resistance path for an external

driver. These devices connect input and output ports through an n-channel

FET. When the gate-to-source junction of this FET is adequately forward-

biased the device conducts and the resistance between input and output

ports is small. Without adequate bias on the gate-to-source junction of the

FET, the FET is turned off, therefore with no VCC applied, the device has

hot insertion capability.

The low on-resistance and simplicity of the connection between input and

output ports reduces the delay in this path to close to zero.

The FST6800 provides a 10-Bit TTL-compatible interface. The ON pin

serves as the enable pin. When ON is high, A and B ports are isolated and

B outputs are precharged to the BIASV voltage, through the equivalent of

a 10K

Ω resistor.

A1

A10

B10

B1

BIASV

ON

A1

A3

A4

A6

A9

A2

A5

A7

A8

A10

GND

VCC

B1

B2

B3

B4

B5

B6

B8

B9

B10

BIASV

B7

15

13

14

24

23

17

18

19

20

21

22

16

1

2

3

4

5

6

7

8

9

10

12

11

ON