74LS74 参数 Datasheet PDF下载

SN74LS74A

AC WAVEFORMS

D*

1.3 V

t

h(L)

t

s(L)

1.3 V

t

W(H)

1.3 V

t

h(H)

t

s(H)

t

W(L)

1.3 V

1

f

MAX

CP

t

PHL

Q

1.3 V

t

PHL

t

PLH

1.3 V

t

PLH

1.3 V

Q

1.3 V

*The shaded areas indicate when the input is permitted to change for predictable output performance.

Figure 1. Clock to Output Delays, Data

Set-Up and Hold Times, Clock Pulse Width

t

W

SET

1.3 V

1.3 V

t

W

CLEAR

t

PLH

1.3 V

t

PHL

Q

1.3 V

t

PHL

1.3 V

t

PLH

1.3 V

Q

1.3 V

1.3 V

Figure 2. Set and Clear to Output Delays,

Set and Clear Pulse Widths

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