SN54AHC594, SN74AHC594

8BIT SHIFT REGISTERS

WITH OUTPUT REGISTERS

SCLS423F − JUNE 1998 − REVISED SEPTEMBER 2003

7

POST OFFICE BOX 655303

(unless otherwise noted) (see Figure 1)

TA = 25°C

SN54AHC594

SN74AHC594

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

tw

Pulse duration

RCLK or SRCLK high or low

5

5

5

ns

tw

Pulse duration

RCLR or SRCLR low

5.2

5.2

5.2

ns

SER before SRCLK

↑

3

3

3

SRCLK

↑ before RCLK↑†

5

5

5

tsu

Setup time

SRCLR low before RCLK

↑

5

5

5

ns

tsu

Setup time

SRCLR high (inactive) before SRCLK

↑

2.9

3.3

3.3

ns

RCLR high (inactive) before RCLK

↑

3.2

3.7

3.7

th

Hold time

SER after SRCLK

↑

2

2

2

ns

† This setup time allows the storage register to receive stable data from the shift register. The clocks can be tied together, in which case the shift

register is one clock pulse ahead of the storage register.

switching characteristics over recommended operating free-air temperature range,

PARAMETER

FROM

TO

LOAD

TA = 25°C

SN54AHC594

SN74AHC594

UNIT

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

LOAD

CAPACITANCE

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

fmax

CL = 15 pF

80*

120*

70*

70

MHz

fmax

CL = 50 pF

55

105

50

50

MHz

tPLH

RCLK

QA−QH

CL = 15 pF

4.6*

8*

1*

8.5*

1

8.5

ns

tPHL

RCLK

QA−QH

CL = 15 pF

4.9*

8.2*

1*

8.8*

1

8.8

ns

tPLH

SRCLK

QH

CL = 15 pF

5.4*

9.1*

1*

9.7*

1

9.7

ns

tPHL

SRCLK

QH′

CL = 15 pF

5.5*

9.2*

1*

9.9*

1

9.9

ns

tPHL

RCLR

QA−QH

CL = 15 pF

6*

9.8*

1*

10.6*

1

10.6

ns

tPHL

SRCLR

QH′

CL = 15 pF

5.6*

9.2*

1*

10*

1

10

ns

tPLH

RCLK

QA−QH

CL = 50 pF

6.9

10.5

1

11.1

1

11.1

ns

tPHL

RCLK

QA−QH

CL = 50 pF

8.1

11.9

1

13.1

1

13.1

ns

tPLH

SRCLK

QH

CL = 50 pF

7.7

11.7

1

12.4

1

12.4

ns

tPHL

SRCLK

QH′

CL = 50 pF

8.4

12.5

1

13.9

1

13.9

ns

tPHL

RCLR

QA−QH

CL = 50 pF

9.1

13.1

1

14.4

1

14.4

ns

tPHL

SRCLR

QH′

CL = 50 pF

8.5

12.4

1

14

1

14

ns

* On products compliant to MIL-PRF-38535, this parameter is not production tested.

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.