CY54FCT244T, CY74FCT244T

8-BIT BUFFERS/LINE DRIVERS

WITH 3-STATE OUTPUTS

SCCS071 – OCTOBER 2001

6

POST OFFICE BOX 655303

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

otherwise noted) (continued)

PARAMETER

TEST CONDITIONS

CY54FCT244T

CY74FCT244T

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

#

One bit switching

at f1 = 10 MHz

VIN ≤ 0.2 V or

VIN ≥ VCC – 0.2 V

0.7

1.4

#

VCC = 5.5 V,

1

at 50% duty cycle VIN = 3.4 V or GND

1

2.4

#

CC

Outputs open,

OEA = OEB = GND

Eight bits

switching

at f1 =2 5MHz

VIN = 0.2 V or

VIN ≥ VCC – 0.2 V

1.3

2.6||

IC#

at f1 = 2.5 MHz

at 50% duty cycle VIN = 3.4 V or GND

3.3

10.6||

mA

IC#

One bit switching

at f1 = 10 MHz

VIN ≤ 0.2 V or

VIN ≥ VCC – 0.2 V

0.7

1.4

mA

VCC = 5.25 V,

1

at 50% duty cycle VIN = 3.4 V or GND

1

2.4

CC

Outputs open,

OEA = OEB = GND

Eight bits

switching

at f1 =2 5MHz

VIN = 0.2 V or

VIN ≥ VCC – 0.2 V

1.3

2.6||

at f1 = 2.5 MHz

at 50% duty cycle VIN = 3.4 V or GND

3.3

10.6||

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.