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IDT54FCT139

FAST CMOS DUAL 1-OF-4 DECODER WITH ENABLE

Integrated Device Technology 

IDT54/74FCT139/A/C

FAST CMOS DUAL 1-0F-4 DECODER WITH ENABLE

MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS VLC = 0.2V; VHC = VCC – 0.2V

Symbol

ICC

∆ICC

ICCD

IC

Parameter

Quiescent Power Supply Current

Quiescent Power Supply Current

TTL Inputs HIGH

Dynamic Power Supply

Current(4)

Total Power Supply Current(6)

Test Conditions(1)

VCC = Max.

VIN ≥ VHC; VIN ≤ VLC

VCC = Max.

VIN = 3.4V(3)

VCC = Max.

Outputs Open

One Bit Toggling

VIN ≥ VHC

VIN ≤ VLC

50% Duty Cycle

VCC = Max.

VIN ≥ VHC

Outputs Open

VIN ≤ VLC

fo = 10MHz

(FCT)

50% Duty Cycle

VIN = 3.4V

One Output Toggling VIN = GND

Min. Typ.(2) Max.

— 0.2 1.5

Unit

mA

— 0.5 2.0 mA

— 0.15 0.3 mA/

MHz

— 1.7 4.5 mA

— 2.0 5.5

VCC = Max.

Outputs Open

fo = 10MHz

50% Duty Cycle

One Output Toggling

on Each Decoder

VIN ≥ VHC

VIN ≤ VLC

(FCT)

VIN = 3.4V

VIN = GND

—

3.2 7.5(5)

—

3.7 9.5(5)

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 (fCP/2 + 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 Output Transition Pair (HLH or LHL)

fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)

fo = Output Frequency

NO = Number of Outputs at fo

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

2605 tbl 04

SWITCHING CHARACTERISTICS OVER OPERATING RANGE

IDT54/74FCT139

Com'l.

Mil.

IDT54/74FCT139A

Com'l.

Mil.

IDT54/74FCT139C

Com'l.

Mil.

Parameter

Description

Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit

tPLH Propagation Delay

tPHL A0 or A1 to On

CL = 50pF

RL = 500Ω

1.5 9.0 1.5 12.0 1.5 5.9 1.5 7.8 1.5 5.0 1.5 6.2 ns

tPLH Propagation Delay

tPHL E to On

1.5 8.0 1.5 9.0 1.5 5.5 1.5 7.2 1.5 4.8 1.5 5.8 ns

NOTES:

2605 tbl 07

1. See test circuit and waveforms.

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

7.4

4

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