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PI74FCT138TS

Fast CMOS 1-of-8 Decoder

Pericom Semiconductor Corporation 

PI74FCT138/238T

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Power Supply Characteristics

Parameters Description

ICC

Quiescent Power

Supply Current

∆ICC

Supply Current per

Input @ TTL HIGH

ICCD

Supply Current per

Input per MHz(4)

IC

Total Power Supply

Current(6)

Test Conditions(1)

VCC = Max.

VCC = Max.

VIN = GND

or VCC

VIN = 3.4V(3)

Min.

Typ(2) Max.

0.1 500

0.5 2.0

Units

µA

mA

VCC = Max., Outputs Open

One Input Toggling

50% Duty Cycle

VCC = Max., Outputs Open

fCP = 10 MHZ, 50% Duty Cycle

Toggle E1, E2, or E3

One Bit toggling

VIN = VCC

VIN = GND

VIN = VCC

VIN = GND

VIN = 3.4V

VIN = GND

0.15 0.3 mA/

MHz

1.5 4.0(5) mA

1.8 5.0(5)

Notes:

1. Fo Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.

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 + fINI)

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)

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.

5

PS2004A 03/09/96

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