SN74LS161AM datasheet(6/8 Pages) ONSEMI

6 / 8 page

SN74LS161A, SN74LS163A

http://onsemi.com

Figure 3.

The positive TC pulse occurs when the outputs are in the (Q0

• Q1 • Q2 • Q3) state for the LS161 and LS163.

OTHER CONDITIONS: CP = PE = CEP = MR = H

1.3 V

tPHL

tPLH

1.3 V

CET

AC WAVEFORMS (continued)

The positive TC pulse is coincident with the output state

(Q0 • Q1 • Q2 • Q3) for the LS161 and LS163.

Figure 4.

OTHER CONDITIONS: PE = CEP = CET = MR = H

1.3 V

tPLH

tPHL

The shaded areas indicate when the input is permitted to

change for predictable output performance.

Figure 5.

1.3 V

OTHER CONDITIONS: PE = L, MR = H

1.3 V

ts(H)

ts(L)

th(H) = 0

th(L) = 0

Q0 w Q1 w Q2 w Q3

P0 w P1 w P2 w P3

OTHER CONDITIONS: PE = H, MR = H

1.3 V

ts(H)

ts(L)

th(H) = 0

th(L) = 0

ts(H)

th(H) = 0

ts(L)

th(L) = 0

COUNT

HOLD

CEP

CET

SR or PE

Q RESPONSE TO PE

RESET

COUNT OR LOAD

Q RESPONSE TO SR

PARALLEL LOAD

(See Fig. 5)

COUNT MODE

(See Fig. 7)

ts(L)

ts(H)

(L) = 0

th(H) = 0

1.3 V

Figure 6.

COUNT ENABLE TRICKLE INPUT

TO TERMINAL COUNT OUTPUT DELAYS

CLOCK TO TERMINAL COUNT DELAYS

SETUP TIME (ts) AND HOLD TIME (th)

FOR PARALLEL DATA INPUTS

SETUP TIME (ts) AND HOLD TIME (th) FOR

COUNT ENABLE (CEP) AND (CET) AND

PARALLEL ENABLE (PE) INPUTS

Figure 7.

The shaded areas indicate when the input is permitted to

change for predictable output performance.

1.3 V

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