SN74LS197 查看數據表（PDF） - Motorola => Freescale

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SN74LS197

4-STAGE PRESETTABLE RIPPLE COUNTERS

Motorola => Freescale 

SN54/74LS196 • SN54/74LS197

AC WAVEFORMS

CP

1.3 V

Q

1.3 V

tW(H)

tPHL

tPLH

1.3 V

1.3 V

Figure 1

Pn

tPHL

Qn

1.3 V

1.3 V

1.3 V

tPLH

NOTE: PL = LOW

Figure 2

Pn

tW

PL 1.3 V

tPLH

tPHL

Qn

1.3 V

Figure 3

PL OR MR

CP

Q

tW

tPHL

1.3 V

trec

1.3 V

1.3 V

Figure 4

Pn*

1.3 V

1.3 V

ts(H)

PL

th(H)

ts(L)

1.3 V

th(L)

1.3 V

Qn*

Q=P

Q=P

* The shaded areas indicate when the input is permitted

* to change for predictable output performance

Figure 5

FAST AND LS TTL DATA

5-6

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