74FCT138 datasheet(3/6 Pages) IDT

3 / 6 page

IDT54/74FCT138/A/C

FAST CMOS 1-OF-8 DECODER-WITH ENABLE

MILITARY AND COMMERCIAL TEMPERATURE RANGES

7.3

POWER SUPPLY CHARACTERISTICS

VLC = 0.2V; VHC = VCC – 0.2V

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

Unit

ICC

Quiescent Power Supply Current

Vcc = Max.

—

0.2

1.5

VIN

≥ VHC; VIN ≤ VLC

∆ICC

Quiescent Power Supply Current

Vcc = Max.

—

0.5

2.0

TTL Inputs HIGH

VIN = 3.4V

(3)

ICCD

Dynamic Power Supply Current

(4)

Vcc = Max.

VIN

≥ VHC

—

0.15

0.3

mA/MHz

Outputs Open

VIN

≤ VLC

One Output Toggling

50% Duty Cycle

Total Power Supply Current

(5)

Vcc = Max.

VIN

≥ VHC

—

1.7

4.5

Outputs Open

VIN

≤ VLC

Toggle

E1, E2 or E3

(FCT)

50% Duty Cycle

VIN = 3.4V

—

2.0

5.5

fO = 10MHz

VIN = GND

One Output Toggling

NOTES:

2581 tbl 04

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. 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.

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified: VLC = 0.2V; VHC = VCC – 0.2V

Commercial: TA = 0

°C to +70°C, VCC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

Unit

VIH

Input HIGH Level

Guaranteed Logic HIGH Level

2.0

—

VIL

Input LOW Level

Guaranteed Logic LOW Level

—

0.8

IIH

Input HIGH Current

VCC = Max.

VI = VCC

——

µA

VI= 2.7V

—

(4)

IIL

Input LOW Current

VI= 0.5V

—

–5

(4)

VI = GND

—

–5

VIK

Clamp Diode Voltage

VCC = Min., IN = –18mA

—

–0.7

–1.2

IOS

Short Circuit Current

VCC = Max.

(3), VO = GND

–60

–120

—

VOH

Output HIGH Voltage

VCC = 3V, VIN = VLC or VHC, IOH = –32

µAVHC

VCC

—V

VCC = Min.

IOH = –300

µAVHC

VCC

—

VIN = VIH or VIL

IOH = –12mA MIL.

2.4

4.3

—

IOH = –15mA COM’L.

2.4

4.3

—

VOL

Output LOW Voltage

VCC = 3V, VIN = VLC or VHC, IOL = 300

µA

—

GND

VLC

VCC = Min.

IOL = 300

µA

—

GND

VLC

(4)

VIN = VIH or VIL

IOL = 32mA MIL.

—

0.3

0.5

IOL = 48mA COM’L.

—

0.3

0.5

NOTES:

2581 tbl 03

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 and maximum loading.

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

4. This parameter is guaranteed but not tested.

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