CD74FCT646M datasheet(5/8 Pages) TI

5 / 8 page

8-71

CD74FCT646

Switching Speciﬁcations Over Operating Range FCT Series tr, tf = 2.5ns, CL = 50pF, RL (Figure 1) (Note 7)

PARAMETER

SYMBOL

VCC (V)

25oC0oC TO 70oC

UNITS

TYP

MIN

MAX

Propagation Delays

(Note 8)

Store An

→ Bn, Store Bn → An, An → Bn, Bn → An

tPLH, tPHL

6.8

Select to Data

tPLH, tPHL

8.3

Output Enable to Output

tPZL, tPZH

10.5

Output Disable to Output

tPLZ, tPHZ

6.8

Power Dissipation Capacitance

CPD

(Note 8)

----

Minimum (Valley) VOHV During Switching of

Other Outputs (Output Under Test Not Switching)

VOHV

0.5

Maximum (Peak) VOLP During Switching of

Other Outputs (Output Under Test Not Switching)

VOLP

Input Capacitance

---

Input/Output Capacitance

CI/O

---

NOTES:

7. 5V: Minimum is at 5.25V for 0oC to 70oC, Maximum is at 4.75V for 0oC to 70oC, Typical is at 5V.

8. 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

fMAX

(Note 9)

-85-

Data to Clock Setup Time

tSU

Data to Clock Hold Time

Clock Pulse Width

NOTE:

9. 5V: Minimum is at 4.75V for 0oC to 70oC, Typical is at 5V.

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