HD74LS161A Datasheet, PDF(8/11 Page) Hitachi Semiconductor – Synchronous 4-bit Binary Counters(direct clear)

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HD74LS161A Datasheet, PDF (8/11 Pages) Hitachi Semiconductor – Synchronous 4-bit Binary Counters(direct clear)

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HD74LS161A

Waveforms 2

tPLH, tPHL, (ClockâQ)

tTLH

tTHL

90% 90%

Clock

10% 10%

1.3V

tTLH

tTHL

Data Inputs

A, B, C or D

90%

10%

90%

tPLH

10%

tPHL

Outputs

QA, QB, QC or QD

1.3V

VOH

1.3V

VOL

Note: Input pulse: tTLH â¤ 15 ns, tTHL â¤ 6 ns, Clock input: PRR = 1 MHz, duty cycle 50%,

Data input: PRR = 500 kHz, duty cycle 50%

Waveforms 3

tPLH, tPHL, (Enable TâRipple Carry)

tTLH

Enable T

10 %

90 %

1.3 V

tPLH

tTHL

90 %

1.3 V

10 %

tPHL

Carry

Output

1.3 V

Note: Input pulse: tTLH â¤ 15 ns, tTHL â¤ 6 ns, PRR = 1 MHz

1.3 V

Waveforms 4

tPHL, (ClearâQ)

Clear

tTHL

tTLH

90%

1.3V

10% 10%

90%

1.3V

tw (CLR) â¥ 20ns

QA to QD

1.3V

tPHL

Note: Input pulse: tTLH â¤ 15 ns, tTHL â¤ 6 ns

VOH

VOL

Rev.2.00, Feb.18.2005, page 8 of 10

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