CY74FCT191T

4-BIT UP/DOWN BINARY COUNTER

SCCS016A – MAY 1994 – REVISED SEPTEMBER 2001

5

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

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

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.75 V,

IIN = –18 mA

–0.7

–1.2

V

VOH

VCC = 4.75 V,

IOH = –32 mA

2

V

VOH

VCC = 4.75 V,

IOH = –15 mA

2.4

3.3

V

VOL

VCC = 4.75 V,

IOL = 64 mA

0.3

0.55

V

VH

All inputs

0.2

V

II

VCC = 5.25 V,

VIN = VCC

5

µA

IIH

VCC = 5.25 V,

VIN = 2.7 V

±1

µA

IIL

VCC = 5.25 V,

VIN = 0.5 V

±1

µA

IOS‡

VCC = 5.25 V,

VOUT = 0 V

–60

–120

–225

mA

Ioff

VCC = 0 V,

VOUT = 4.5 V

±1

µA

ICC

VCC = 5.25 V, VIN < 0.2 V, VIN > VCC – 0.2 V

0.1

0.2

mA

∆ICC

VCC = 5.25 V, VIN = 3.4 V§, f1 = 0, Outputs open

0.5

2

mA

ICCD¶

VCC = 5.25 V, One bit switching at 50% duty cycle, Preset mode, Outputs open,

MR = VCC = SR, PL = CE = U/D = CP = GND, VIN < 0.2 V or VIN > VCC – 0.2 V

0.06

0.12

mA/

MHz

#

One bit switching

at f1 5 MHz

VIN = VCC or GND

0.4

0.8

mA

IC#

VCC = 5.25 V,

Preset mode,

at f1 = 5 MHz

at 50% duty cycle

VIN = 3.4 V or GND

0.7

1.8

mA

IC#

,

Outputs open,

PL =CE =U/D=CP=GND

Four bits switching

at f1 5 MHz

VIN = VCC or GND

1.3

2.6||

mA

PL = CE = U/D = CP = GND

at f1 = 5 MHz

at 50% duty cycle

VIN = 3.4 V or GND

2.3

6.6||

mA

Ci

5

10

pF

Co

9

12

pF

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

‡ Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or

sample-and-hold techniques are preferable to minimize internal chip heating and more accurately reflect operational values. Otherwise, prolonged

shorting of a high output can raise the chip temperature well above normal and cause invalid readings in other parametric tests. In any sequence

of parameter tests, IOS tests should be performed last.

§ Per TTL-driven input (VIN = 3.4 V); all other inputs at VCC or GND

¶ 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.