Integrated Device Technology Inc IDT74FST163383PV, IDT74FST163383PF, IDT74FST163383PA, IDT74FST1632383PV, IDT74FST1632383PF Datasheet

20-BIT BUS EXCHANGE
SWITCH

IDT74FST163383

IDT74FST1632383

ADVANCE INFORMATION

FEATURES:

• Bus switches provide zero delay paths

• Extended commercial range of –40°C to +85°C

• Low switch on-resistance:
FST163xxx – 5Ω
FST1632xxx — 28Ω

• TTL-compatible input and output levels

• ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)

• Available in SSOP, TSSOP and TVSOP

DESCRIPTION:

The FST163383/1632383 belong to IDT's family of Bus
switches. Bus switch devices perform the function of connect­ing or isolating two ports without providing any inherent
current sink or source capability. Thus they generate little or

FUNCTIONAL BLOCK DIAGRAM

A0

C0

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 FST1632xxx integrates terminating resistors in the
device, thus eliminating the need for external 25Ω series
resistors.

The FST163383 and FST1632383 each provide four 4-bit
TTL- compatible ports that support 2 way bus exchange. The
BX pin controls the bus exchange and the BE pin serves as the
enable pin.

A5

C5

B0

A4

B4

BX1

BE1

PIN DESCRIPTION

Pin Names I/O Description

A

0-9

, B

0-9

C

0-9

, D

0-9

BE

1,2

BX

1,2

I/O Buses A, B
I/O Buses C, D

I Bus Switch Enable (Active LOW)
I Bus Exchange

D0

C4

D4

3474 tbl 01

B5

A9

B9

BX2

BE2

D5

C9

D9

3474 drw 01

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

COMMERCIAL TEMPERATURE RANGE MAY 1996

1997 Integrated Device Technology, Inc. DSC-3474/4

1

IDT74FST163383, IDT74FST1632383
20-BIT BUS EXCHANGE SWITCH COMMERCIAL TEMPERATURE RANGE

PIN CONFIGURATION

BE1

GND

BE2

1
2

C

0

A

0

3
4

B

0

5

0

D
C

1

6
7

A

1

8

B

1

9

D

1

10

C

2

A

2

11

SO48-1

12

SO48-2
SO48-3

13
14

C

5

A

5

15

48
47
46

45
44

43
42
41

40
39

38
37
36
35
34

Vcc
D

4

B

4

A

4

C

4

D

3

B

3

A

3

C

3

D

2

B

2

BX1
Vcc
D

9

B

9

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Description Max. Unit

(2)

VTERM

Terminal Voltage with Respect

–0.5 to +7.0 V

to GND

TSTG Storage Temperature –65 to +150 °C
IOUT Maximum Continuous Channel

128 mA

Current

(2)

Typ. Unit

3474 tbl 02

NOTES:

1. Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-

INGS may cause permanent damage to the device. This is a stress rating

only and functional operation of the device at these or any other conditions

above those indicated in the operational sections of this specification is not

implied. Exposure to absolute maximum rating condiitions for extended

periods may affect reliability.

2. VCC, Control and Switch terminals.

CAPACITANCE

(1)

Symbol Parameter Conditions

CIN Control Input Capacitance 4 pF
CI/O

Switch Input/Output

Switch Off

pF

Capacitance

NOTES:

1. Capacitance is characterized but not tested.

2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V

3474 tbl 03

B
D

C

A
B
D
C

A

GND

16

5

5

17

6

18
19

6

33
32

31
30

A

9

FUNCTION TABLE

C

9

D

8

B

8

BE

1 BX1 A0-4 B0-4 Description

BE

H X Hi-Z Hi-Z Disconnect
LLC0-4 D0-4 Connect
LHD0-4 C0-4 Exchange

20

6

21

6

22

7

7

23
24

SSOP/

TSSOP/TVSOP

TOP VIEW

29

28
27

26
25

A

8

C

8

D

7

B

7

BX2

3474 drw 02

BE

2 BX2 A5-9 B5-9 Description

BE

H X Hi-Z Hi-Z Disconnect
LLC5-9 D5-9 Connect
LHD5-9 C5-9 Exchange

3474 tbl 04

2