HD74LS669 Datasheet, PDF(7/9 Page) Hitachi Semiconductor – Synchronous Up/Down 4-bit Binary Counters

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HD74LS669 Datasheet, PDF (7/9 Pages) Hitachi Semiconductor – Synchronous Up/Down 4-bit Binary Counters

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HD74LS669

Waveforms 2

tTLH

tTHL

Clock

90%

10% 1.3V 1.3V 10%

1.3V

(Measure at tw (CK) tPHL

tPLH

tn + 1)

(Measure at tn + 2)

VOH

1.3V

tPHL

tPLH (Measure at tn + 2)

VOL

(Measure at tn + 4)

VOH

1.3V

VOL

tPHL

tPLH (Measure at tn + 4)

(Measure at tn + 8)

VOH

1.3V

VOL

tPHL

tPLH (Measure at tn + 8)

(Measure at

tn + 16)

VOH

1.3V

VOL

tPLH (Measure before tPHL (Measure at tn + 16)

1 clock of tn + 16)

VOH

Ripple

Carry

1.3V

Output

VOL

Notes:

1. Input pulse; tTLH â¤ 15 ns, tTHL â¤ 6 ns, PRR = 1 MHz, duty cycle 50%.

2. For Æmax tTLH = tTHL â¤ 2.5 ns.

3. tn is the bit-time when all outputs are low.

Rev.2.00, Feb.18.2005, page 7 of 8

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