Datasheet IDT74FST163384PF, IDT74FST163384PA, IDT74FST1632384PV, IDT74FST1632384PF, IDT74FST1632384PA Datasheet (Integrated Device Technology)

Integrated Device Technology, Inc.

20-BIT BUS SWITCH

IDT74FST163384

IDT74FST1632384

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 FST163384/1632384 belong to IDT's family of Bus
switches. Bus switch devices perform the function of connect­ing or isolating two ports without providing any inherent

FUNCTIONAL BLOCK DIAGRAM

A

0

B

0

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

The FST163384 and FST1632384 are 20-bit TTL-compat­ible bus switches. The BEx pins provide enable control.

A

10

B

10

A

4

A

5

A

9

BEA

BEB

PIN DESCRIPTION

Pin Names I/O Description

A

0-19

B

0-19

BEA, BEB
BEC, BED

,

,

I/O Bus A
I/O Bus B

I Bus Switch Enable (Active LOW)

A

A

A

BEC

BED

14

15

19

B

14

B

15

B

19

3473 drw 01

B

4

B

5

B

9

3473 tbl 01

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

COMMERCIAL TEMPERATURE RANGE FEBRUARY 1997

1997 Integrated Device Technology, Inc. DSC-3473/4

1

IDT74FST163384, IDT74FST1632384
20-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE

PIN CONFIGURATION

BEA

GND

BEC

GND

1
2

B

0

A

0

3
4

A

1

5

B

1

B

2

6
7

A

2

8

A

3

9

B

3

10

4

B

A

4

11

SO48-1

12

SO48-2
SO48-3

13
14

B

5

A

5

15
16

A

6

17

B

6

B

7

18
19

A

7

20

A

8

21

B

8

22

9

B

9

A

23
24

48
47

46

45
44

43
42
41

40
39

38

37

36
35
34

33
32

31
30
29

28
27

26
25

Vcc

19

B

A

19

A

18

B

18

B

17

A

17

A

16

B

16

B

15

A

15

BEB
Vcc

14

A
B

14

A

13

B

13

B

12

A

12

A

11

B

11

B

10

A

10

BED

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

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.

3473 tbl 02

FUNCTION TABLE

BEA

BEA

H H Hi-Z Hi-Z Disconnect
LHA
H L Hi-Z A
LLA

BEC

BEC

H H Hi-Z Hi-Z Disconnect
LHA
H L Hi-Z A
LLA

CAPACITANCE

Symbol Parameter Conditions

CIN Control Input Capacitance 4 pF
CI/O

NOTES:

1. Capacitance is characterized but not tested

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

BEB

BEB

BED

BED

B

B

0-4

0-4

0-4

10-14

10-14

10-14

(1)

Switch Input/Output
Capacitance

B

5-9

Description

Hi-Z Connect

B

5-9

A

5-9

15-19

Connect
Connect

Description

Hi-Z Connect

A

15-19
15-19

Connect
Connect

Switch Off

(2)

Typ. Unit

3473 tbl 03

pF

3473 tbl 04

SSOP/

TSSOP/TVSOP

TOP VIEW

3473 drw 02

2

IDT74FST163384, IDT74FST1632384
20-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:
Commercial: TA = –40°C to +85°C, VCC = 5.0V ±10%

Symbol Parameter Test Conditions

(1)

Min. Typ.

VIH Input HIGH Voltage Guaranteed Logic HIGH for Control Inputs 2.0 — — V
VIL Input LOW Voltage Guaranteed Logic LOW for Control Inputs — — 0.8 V
II H Input HIGH Current VCC = Max. VI = VCC ——±1µA
II L Input LOW Voltage VI = GND — — ±1
IOZH High Impedance Output Current VCC = Max. VO = VCC ——±1µA
IOZL (3-State Output pins) VO = GND — — ±1
IOS Short Circuit Current VCC = Max., VO = GND

(3)

— 300 — mA
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V
RON Switch On Resistance

(4)

VCC = Min. VIN = 0.0V 163xxx — 5 7 Ω
ION = 30mA 1632xxx 20 28 40
VCC = Min. VIN = 2.4V 163xxx — 10 15 Ω

ION = 15mA 1632xxx 20 35 48
IOFF Input/Output Power Off Leakage VCC = 0V, VIN or VO ≤ 4.5V — — 1 µA
ICC Quiescent Power Supply Current VCC = Max., VIN = GND or VCC — 0.1 3 µA

NOTES:

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at VCC = 5.0V, +25°C ambient.

3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.

4. Measured by voltage drop between ports at indicated current through the switch.

(2)

Max. Unit

3473 tbl 05

3

IDT74FST163384, IDT74FST1632384
20-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE

POWER SUPPLY CHARACTERISTICS

Symbol Parameter Test Conditions

∆I

I

CCD

CC

Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply

(4)

Current

VCC = Max.

= 3.4V

(3)

V

IN

VCC = Max.
Outputs Open

(1)

VIN = V

CC

VIN = GND

Min. Typ.

— 0.5 1.5 mA

—3040

Enable Pin Toggling
50% Duty Cycle

I

C

Total Power Supply Current

(6)

VCC = Max.
Outputs Open

VIN = V

CC

VIN = GND

— 6.0 8.0 mA

Enable Pins Toggling
(20 Switches Toggling)
fi = 10MHz

VIN = 3.4
V

IN

= GND

— 7.0 11.0

50% Duty Cycle

NOTES:

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at VCC = 5.0V, +25°C ambient.

3. Per TTL driven input (VIN = 3.4V). All other inputs at VCC or GND.

4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.

5. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested.

6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fiN)
ICC = Quiescent Current
∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
fi = Input Frequency
N = Number of Switches Toggling at fi
All currents are in milliamps and all frequencies are in megahertz.

(2)

Max. Unit

µ

A/

MHz/

Switch

3473 tbl 06

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:
Commercial: TA =–40°C to +85°C, VCC = 5.0V ±10%

163384 1632384

Symbol Description Condition

tPLH
tPHL
tPZH
tPZL

tPHZ
tPLZ
|QCI| Charge Injection

NOTES:

1. See test circuit and waveforms.

2. Minimum limits guaranteed but not tested.

3. This parameter is guaranteed by design but not tested.

4. The bus switch contributes no propagation delay other than the RC delay of the on resistance of the switch and the load capacitance. The time constant
for the switch alone is of the order of 2.5ns for 50pF load. Since this time is constant and much smaller than the rise/fall times of typical driving signals,
it adds very little propagation delay to the system. Propagation delay on the bus switch when used in a system is determined by the driving circuit on the
driving side of the switch and its interaction with the load on the driven side.

5. Measured at switch turn off, load = 50 pF in parallel with 10MΩ scope probe, VIN = 0.0 volts.

6. Characterized parameter. Not 100% tested.

Data Propagation Delay
Ai to Bi, Bi to Ai

(3,4)

Switch Turn on Delay
BEx to Ai, Bi

Switch Turn off Delay
BEx to Ai, Bi

(3)

(5,6)

CL = 50pF

R

L = 500Ω

(1)

Min.

(2)

Typ.

Max. Unit

— — 0.25 1.25 ns

1.5 — 6.5 7.5 ns

1.5 — 5.5 5.5 ns

— 1.5 — — pC

3473 tbl 07

4

IDT74FST163384, IDT74FST1632384
20-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE

TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS

SWITCH POSITION

V

CC

V

OUT

Pulse

Generator

V

IN

D.U.T.

50pF

T

R

C L

SET-UP, HOLD AND RELEASE TIMES

DATA

INPUT

TIMING

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

PRESET

CLEAR

CLOCK ENABLE

ETC.

tSU

tSU

tH

tREM

tH

500Ω

500Ω

7.0V

3473 lnk 03

3V

1.5V
0V

3V

1.5V
0V

3V

1.5V
0V

3V

1.5V
0V

3473 lnk 04

Test

Switch

Open Drain
Disable Low

Closed

Enable Low

All Other Tests

DEFINITIONS:

CL= Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse

Generator.

Open

PULSE WIDTH

LOW-HIGH-LOW

HIGH-LOW-HIGH

PULSE

tW

PULSE

3473 lnk 08

1.5V

1.5V

3473 lnk 05

PROPAGATION DELAY

SAME PHASE

INPUT TRANSITION

tPLH

OUTPUT

tPLH tPHL

OPPOSITE PHASE

INPUT TRANSITION

tPHL

3V

1.5V
0V

V

OH

1.5V

VOL

3V

1.5V
0V

3473 lnk 06

ENABLE AND DISABLE TIMES

ENABLE DISABLE

3V

CONTROL

INPUT

t

PLZtPZL

OUTPUT

NORMALLY

LOW

SWITCH
CLOSED

3.5V

1.5V

tPZH t PHZ

OUTPUT

NORMALLY

HIGH

NOTES:

1. Diagram shown for input Control Enable-LOW and input Control Disable­HIGH

2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns

SWITCH
OPEN

1.5V
0V

0.3V

0.3V

1.5V
0V

3.5V

VOL

VOH

0V

3473 lnk 07

5

IDT74FST163384, IDT74FST1632384
20-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE

ORDERING INFORMATION

IDT XX

Temp. Range

FST

Device Type

16 XX

X

Package

PV
PA
PF

163384

Shrink Small Outline Package (SO48-1)
Thin Shrink Small Outline Package (SO48-2)
Thin Very Small Outline Package (SO48-3)

20-Bit Bus Switch

1632384

74 –40°C to +85°C

3473 drw 08

6