CY54FCT480T, CY74FCT480T

DUAL 8-BIT PARITY GENERATORS/CHECKERS

SCCS025B – MAY 1993 – REVISED OCTOBER 2001

5

POST OFFICE BOX 655303

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

otherwise noted) (continued)

PARAMETER

TEST CONDITIONS

CY54FCT480T

CY74FCT480T

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

ICCD¶

VCC = 5.5 V, Outputs open,

One bit switching at 50% duty cycle,

VIN ≤ 0.2 V or VIN ≥ VCC – 0.2 V

0.06

0.12

mA/

ICCD¶

VCC = 5.25 V, Outputs open,

One bit switching at 50% duty cycle,

VIN ≤ 0.2 V or VIN ≥ VCC – 0.2 V

0.06

0.12

MHz

#

One bit

switching

at f1 = 2.5 MHz

VIN ≤ 0.2 V or

VIN ≥ VCC – 0.2 V

0.7

1.4

#

VCC = 5.5 V,

f0 0 MHz

1

at 50% duty

cycle

VIN = 3.4 V or GND

1

2.4

#

f0 = 0 MHz,

Outputs open

16 bits

switching

at f1 = 2.5 MHz

VIN ≤ 0.2 V or

VIN ≥ VCC – 0.2 V

2.5

5||

IC#

1

at 50% duty

cycle

VIN = 3.4 V or GND

6.5

21||

mA

IC#

One bit

switching

at f1 = 2.5 MHz

VIN ≤ 0.2 V or

VIN ≥ VCC – 0.2 V

0.7

1.4

mA

VCC = 5.25 V,

f0 0 MHz

1

at 50% duty

cycle

VIN = 3.4 V or GND

1

2.4

f0 = 0 MHz,

Outputs open

16 bits

switching

at f1 = 2.5 MHz

VIN ≤ 0.2 V or

VIN ≥ VCC – 0.2 V

2.5

5||

1

at 50% duty

cycle

VIN = 3.4 V or GND

6.5

21||

Ci

5

10

5

10

pF

Co

9

12

9

12

pF

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

¶ This parameter is derived for use in total power-supply calculations.

# 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.