CD74FCT821AM datasheet(4/7 Pages) TI

4 / 7 page

8-4

Switching Speciﬁcations Over Operating Range FCT Series tr, tf = 2.5ns, CL = 50pF, RL (See Figures)

PARAMETER

SYMBOL

VCC (V)

25oC0oC TO 70oC

UNITS

TYP

MIN

MAX

Propagation Delays (Note 6)

Clock to Q

CD74FCT821A

tPLH, tPHL

7.5

1.5

Clock to Q

CD74FCT822A

tPLH, tPHL

7.5

1.5

Output Enable to Q

CD74FCT821A

tPZL, tPZH

1.5

Output Disable to Q

CD74FCT821A

tPLZ, tPHZ

1.5

Output Enable to Q

CD74FCT822A

tPZL, tPZH

1.5

Output Disable to Q

CD74FCT822A

tPLZ, tPHZ

1.5

Power Dissipation Capacitance (Note 7)

CPD

−

Minimum (Valley) VOH During Switching of Other Outputs

(Output Under Test Not Switching)

VOHV

0.5 Typical at 25oCV

Maximum (Peak) VOL During Switching of Other Outputs

(Output Under Test Not Switching)

VOLP

1 Typical at 25oCV

Input Capacitance

---

Three-State Output Capacitance

---

NOTES:

6. 5V: Minimum is at 5.25V for 0oC to 70oC, Maximum is at 4.75 for 0oc t0 70oC, Typical is at 5V.

7. CPD, measured per flip-flop, is used to determine the dynamic power consumption.

PD (per package) = VCC ICC + Σ (VCC

2 f

I CPD + VO

2 f

OCL + VCC ∆ICC D) where:

VCC = supply voltage

∆ICC = flow through current x unit load

CL = output load capacitance

D = duty cycle of input high

fO = output frequency

fI = input frequency

Prerequisite for Switching

PARAMETER

SYMBOL

VCC (V)

25oC0oC TO 70oC

UNITS

TYP

MIN

MAX

Maximum Frequency (Note 8)

fMAX

MHz

Data to Clock Setup Time

tSU

5-4-

Data to Clock Hold Time

5-2-

Clock Pulse Width

5-7-

NOTE:

8. 5V: Minimum is at 4.75V for 0oC to 70oC, Typical is at 5V.

CD74FCT821A, CD74FCT822A

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