IDT74FCT138ATEB datasheet(4/6 Pages) IDT

Part #	IDT74FCT138ATEB

Description	FAST CMOS 1-OF-8 DECODER WITH ENABLE

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Manufacturer	IDT [Integrated Device Technology]

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4 / 6 page

6.3

4

IDT54/74FCT138T/AT/CT

FAST CMOS 1-OF-8 DECODER-WITH ENABLE

MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

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 (foNo)

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)

fo = Output Frequency

No = Number of Outputs at fo

All currents are in milliamps and all frequencies are in megahertz.

2570 tbl 06

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

NOTES:

2570 tbl 07

1. See test circuit and waveforms.

2. Minimum limits are guaranteed but not tested on Propagation Delays.

Symbol

Parameter

Test Conditions(1)

Min.

Typ.(2)

Max.

Unit

∆ICC

Quiescent Power Supply Current

TTL Inputs HIGH

VCC = Max.

VIN = 3.4V(3)

—

0.5

2.0

mA

ICCD

Dynamic Power Supply Current(4)

VCC = Max.

Outputs Open

One Bit Toggling

50% Duty Cycle

VIN = VCC

VIN = GND

—

0.15

0.3

mA/

MHz

IC

Total Power Supply Current(6)

VCC = Max.

Outputs Open

Toggle

E1, E2 or E3

VIN = VCC

VIN = GND

—

1.5

4.0

mA

50% Duty Cycle

fo = 10MHz

One Input and

One Output Toggling

VIN = 3.4V

VIN = GND

—

1.8

5.0

FCT138T

FCT138AT

FCT138CT

Com'l.

Mil.

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Condition(1)

Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max. Min.

(2)

Max.

Unit

tPLH

tPHL

Propagation Delay

An to

On

CL = 50pF

RL = 500

Ω

1.5

9.0

1.5 12.0

1.5

5.8

1.5

7.8

1.5

5.1

1.5

6.0

ns

tPLH

tPHL

Propagation Delay

E1 or E2 to On

1.5

9.0

1.5 12.5

1.5

5.9

1.5

8.0

1.5

5.2

1.5

6.1

ns

tPLH

tPHL

Propagation Delay

E3 to

On

1.5

9.0

1.5 12.5

1.5

5.9

1.5

8.0

1.5

5.2

1.5

6.1

ns

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