HD74HC670FPEL 查看數據表（PDF） - Renesas Electronics

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HD74HC670FPEL

4-by-4 Register File (with 3-state outputs)

Renesas Electronics 

HD74HC670

• Waveform – 2

tr

tf

Data

D1 to D4

50%

GW

Q1 to Q4

tPLH

50%

50%

tPHL

50%

VCC

0V

VCC

0V

VOH

VOL

VCC

Data

50%

D1 to D4

0V

GW

Q1 to Q4

tPHL

90%

50%

10%

tTHL

50%

tPLH

90%

50%

tTLH

VCC

0V

VOH

VOL

Note : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, tr ≤ 6 ns, tf ≤ 6 ns

• Waveform – 3

tf

tr

Read

90 %

50 %

90 %

VCC

50 %

Enable

10 %

10 %

0V

tZL

tLZ

Waveform - A

50 %

tZH

10 %

tHZ

VOH

VOL

Waveform - B

50 %

90 %

VOH

VOL

Notes : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, tr ≤ 6 ns, tf ≤ 6 ns

2. Waveform - A is for an output with internal conditions such that the

output is low except when disabled by the output control.

3. Waveform - B is for an output with internal conditions such that the

output is high except when disabled by the output control.

4. The output are measured one at a time with one transition per measurement.

Rev.2.00 Mar 30, 2006 page 7 of 8

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