74AHC594_08 datasheet(11/22 Pages) NXP

11 / 22 page

74AHC_AHCT594_2

Product data sheet

Rev. 02 — 9 June 2008

11 of 22

NXP Semiconductors

74AHC594; 74AHCT594

8-bit shift register with output register

[1]

Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).

[2]

CPD is used to determine the dynamic power dissipation (PD in µW).

PD =CPD × VCC2 × fi × N+ Σ(CL × VCC2 × fo) where:

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

VCC = supply voltage in V;

N = number of inputs switching;

Σ(C

L × VCC

× f

o) = sum of the outputs.

tPHL

HIGH to LOW

propagation

delay

SHCP to Q7S; see Figure 9

CL = 15 pF

4.1

6.7

1.8

7.6

1.8

8.3

CL = 50 pF

5.4

8.8

2.4

10.1

2.4

11.0

STCP to Qn; see Figure 10

CL = 15 pF

3.7

6.1

1.9

6.9

1.9

7.2

CL = 50 pF

5.2

8.5

2.6

9.7

2.6

10.5

SHR to Q7S; see Figure 13

CL = 15 pF

4.3

7.0

2.4

8.0

2.4

8.7

CL = 50 pF

5.4

8.8

2.7

10.1

2.7

11.0

STR to Qn; see Figure 14

CL = 15 pF

4.5

7.4

2.3

8.4

2.3

9.2

CL = 50 pF

5.7

9.4

3.1

10.7

3.1

11.7

fmax

maximum

frequency

SHCP or STCP;

see Figure 9 and 10

160

MHz

pulse width

SHCP and STCP HIGH or

LOW; see Figure 9 and 10

5.5

6.0

6.5

SHR and STR HIGH or LOW;

see Figure 13 and 14

5.2

5.5

6.0

tsu

set-up time

DS to SHCP; see Figure 11

3.0

3.5

SHR to STCP; see Figure 12

5.0

5.5

SHCP to STCP; see Figure 10

5.0

5.5

hold time

DS to SHCP; see Figure 11

2.0

2.5

trec

recovery time

SHR to SHCP; see Figure 13

2.9

3.3

3.8

STR to STCP; see Figure 14

3.4

3.8

4.3

CPD

power

dissipation

capacitance

fi = 1 MHz; VI = GND to VCC

[2]

-55

Table 7.

Dynamic characteristics …continued

Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 15.

Symbol Parameter

Conditions

°C

−40 °C to +85 °C −40 °C to +125 °C Unit

Min

Typ[1] Max

Min

Max

Min

Max

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