CY54FCT138T, CY74FCT138T

1-OF-8 DECODERS

SCCS013B – MAY 1994 – REVISED OCTOBER 2001

5

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted) (continued)

PARAMETER

TEST CONDITIONS

CY54FCT138T

CY74FCT138T

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

#

VCC = 5.5 V,

Outputs open,

Switch E1 E2 or

One output

switching

at f1 = 10 MHz

VIN ≤ 0.2 V or

VIN ≥ VCC – 0.2 V

0.7

1.4

IC#

Switch E1, E2, or

E3

1

at 50% duty

cycle

VIN = 3.4 V or GND

1

2.4

mA

IC#

VCC = 5.25 V,

Outputs open,

Switch E1 E2 or

One output

switching

at f1 = 10 MHz

VIN ≤ 0.2 V or

VIN ≥ VCC – 0.2 V

0.7

1.4||

mA

Switch E1, E2, or

E3

1

at 50% duty

cycle

VIN = 3.4 V or GND

1

2.4||

Ci

5

10

5

10

pF

Co

9

12

9

12

pF

† Typical values are at VCC = 5 V, TA = 25°C.

# IC

= ICC + ∆ICC × DH × NT + ICCD (f0/2 + f1 × N1)

Where:

IC

= Total supply current

ICC

= Power-supply current with CMOS input levels

∆ICC = Power-supply current for a TTL high input (VIN = 3.4 V)

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)

f0

= Clock frequency for registered devices, otherwise zero

f1

= Input signal frequency

N1

= Number of inputs changing at f1

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

|| Values for these conditions are examples of the ICC formula.

switching characteristics over operating free-air temperature range (see Figure 1)

PARAMETER

FROM

TO

CY54FCT138T

CY54FCT138CT

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

MAX

MIN

MAX

UNIT

tPLH

A

O

1.5

12

1.5

6

ns

tPHL

A

O

1.5

12

1.5

6

ns

tPLH

E

E

O

1.5

12.5

1.5

6.1

ns

tPHL

E1 or E2

O

1.5

12.5

1.5

6.1

ns

tPLH

E3

O

1.5

12.5

1.5

6.1

ns

tPHL

E3

O

1.5

12.5

1.5

6.1

ns

switching characteristics over operating free-air temperature range (see Figure 1)

PARAMETER

FROM

TO

CY74FCT138T

CY74FCT138AT

CY74FCT138CT

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

tPLH

A

O

1.5

9

1.5

5.8

1.5

5

ns

tPHL

A

O

1.5

9

1.5

5.8

1.5

5

ns

tPLH

E

E

O

1.5

9

1.5

5.9

1.5

5

ns

tPHL

E1 or E2

O

1.5

9

1.5

5.9

1.5

5

ns

tPLH

E3

O

1.5

9

1.5

5.9

1.5

5

ns

tPHL

E3

O

1.5

9

1.5

5.9

1.5

5

ns