CD74FCT843AM datasheet(5/6 Pages) TI

5 / 6 page

8-5

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

PARAMETER

SYMBOL

VCC (V)

25oC0oC TO 70oC

UNITS

TYP

MIN

MAX

Propagation Delays

Data to Outputs

CD74FCT843A

tPLH, tPHL

(Note 6)

6.8

1.5

CD74FCT844A

tPLH, tPHL

7.5

1.5

LE to Outputs

tPLH, tPHL

1.5

PRE to Outputs

tPLH

1.5

CLR to Outputs

tPHL

9.8

1.5

Output Enable Times

tPZL, tPZH

10.5

1.5

Output Disable Times

tPLZ, tPHZ

1.5

Power Dissipation Capacitance

CPD

(Note 7)

----

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

---

Three-State Output Capacitance

---

NOTES:

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

Setup Time, Data to LE

tSU

(Note 8)

2.5

Hold Time, Data to LE

2.5

LE Pulse Width

5-4-

PRE, CLR Pulse Width

5-8-

PRE, CLR Recovery Time

tREC

NOTE:

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

Test Circuits and Waveforms

NOTE:

9. Pulse Generator for All Pulses: Rate

≤ 1.0MHz; ZOUT ≤ 50Ω;

DUT

PULSE ZO

GEN

500

Ω

50pF

500

Ω

VCC

RT = ZO

tr, tf = 2.5ns

(NOTE 9)

SWITCH POSITION

TEST

SWITCH

tPLZ, tPZL, Open Drain

Closed

tPHZ, tPZH, tPLH, tPHL

Open

DEFINITIONS:

CL = Load capacitance, includes jig and probe

capacitance.

RT = Termination resistance, should be equal to ZOUT of

the Pulse Generator.

0V to 3V

CD74FCT843A, CD74FCT844A

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