IDT74FST1632861PVG datasheet(4/6 Pages) IDT

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INDUSTRIALTEMPERATURERANGE

IDT74FST1632861

20-BIT, TWO PORT BUS SWITCH WITH RESISTOR

Symbol

Parameter

Test Conditions(1)

Min.

Typ.(2)

Max.

Unit

ΔICC

Quiescent Power Supply Current

VCC = Max.

—

0.5

1.5

TTL Inputs HIGH

VIN = 3.4V(3)

ICCD

Dynamic Power Supply

VCC = Max.

VIN = VCC

—

400

µA/

Current(4,5)

Outputs Open

VIN = GND

MHz/

Select Input Togging

Select

50% Duty Cycle

Total Power Supply Current(6)

VCC = Max.

VIN = VCC

—

0.6

Outputs Open

VIN = GND

Two Enable Pins Toggling

VIN = 3.4V

—

0.7

9.5

fi = 10MHz

VIN = GND

50% Duty Cycle

POWER SUPPLY CHARACTERISTICS

NOTES:

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. TA = –40°C to +85°C

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. Switch inputs do not contribute to

ΔICC.

4. This parameter represents the current required to switch the internal capacitance of the control inputs at the specified frequency.

Switch inputs generate no significant power supply currents as they transition. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.

5. CPD = ICCD/VCC

CPD = Power Dissipation Capacitance

6. IC = IQUIESCENT + IINPUTS + IDYNAMIC

IC = ICC +

ΔICC DHNT + ICCD (fiN)

ICC = Quiescent Current

ΔICC = 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 = Control Input Frequency

N = Number of Control Inputs Toggling at fi

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 10%

VCC = 5V ± 10%

VCC = 4V

Symbol

Description(1)

Min.

Typ.

Max.

Unit

tPLH

Data Propagation Delay

—

0.25

tPHL

A to B, Y to B(2)

tPZH

Switch CONNECT Delay

1.5

—

6.5

tPZL

OE to A or B

tPHZ

Switch DISCONNECT Delay

1.5

—

tPLZ

OE to A or B

|QCI|

Charge Injection During Switch DISCONNECT,

—

1.5

—

OE to A or B(3)

NOTES:

1. See test circuits and waveforms.

2. The bus switch contributes no Propagation Delay other than the RC Delay of the load interacting with the RC of the switch.

3. |QCI| is the charge injection for a single switch DISCONNECT and applies to either single switches or multiplexers. |QDCI| is the charge injection for a multiplexer as the multiplexed

port switches from one path to another. Charge injection is reduced because the injection from the DISCONNECT of the first path is compensated by the CONNECT of the

second path.

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