ST 74VHC594 User Manual

74VHC594

8 BIT SHIFT REGISTER

WITH OUTPUT REGISTER

■ HIGH SPEED: t

■ LOW POWER DISSIPATION:

I

= 4 µA (MAX.) at TA=25°C

CC

■ HIGH NOISE IMMUNITY:

V

= V

NIH

■ POWER DOWN PROTECTION ON INPUTS

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

OH

■ BALANCED PROPAGATION DELAYS:

t

PLH

■ OPERATING VOLTAGE RANGE:

V

CC

■ PIN AND FUNCTION COMPATIBLE WITH

NIL

| = IOL = 8 mA (MIN)

≅ t

PHL

(OPR) = 2V to 5.5V

= 4.2ns (TYP.) at VCC = 5V

PD

= 28% VCC (MIN.)

74 SERIES 594

■ IMPROVED LATCH-UP IMMUN ITY

■ LOW NOISE: V

= 0.8V (MAX.)

OLP

DESCRIPTION

The 74VHC594 is an high speed CMOS 8-BIT
SHIFT REGISTERS fabricated with sub-micron
silicon gate C

2

MOS technology.

This device contains an 8-bit serial-in, parallel-out
shift register that feeds an 8-bit D-type storage
register. Separate clocks and direct overriding
clear (SCLR,

RCLR) are provided for both the shift

register and the storage register.

TSSOPSOP

Table 1: Order Codes

PACKAGE T & R

SOP M74VHC594RMTR

TSSOP M74VHC594TTR

A serial (QH’) output is provided for cascading
purposes.

Both the shift register and storage

register use positive-edge triggered clocks. If the
clocks are connected together, the shift register
state will always be one c lock pulse a head of the
storage register.
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage. This device can be
used to interface 5V to 3V.
All inputs are equipped with protection circuits
against static discharge, giving them 2KV ESD
immunity and transient excess voltage.

Figure 1: Pin Connection An d I E C Logic Symbols

Rev. 5

1/14November 2004

74VHC594

Figure 2: Input Equivalent Circuit Table 2: Pin Description

PIN N° SYMBOL NAME AND FUNCTION

1, 2, 3, 4, 5,

6, 7, 15

9 QH’ Serial Data Output
10 SCLR
11 SCK Shift Register Clock Input
13 RCLR

14 SI Serial Data Input
12 RCK Storage Register Clock

8 GND Ground (0V)
16 V

Table 3: Truth Table

QA to QH Data Outputs

Shift Register Clear Input

Storage Register Clear
Input

Input

CC

Positive Supply Voltage

INPUTS

SI SCK SCLR

X X L X X SHIFT REGISTER IS CLEAR

LHXX

HHXX

L H X X SHIFT REGISTER STATE IS NOT CHANGED
X X X X L STORAGE REGISTER IS CLEARED

XXX H
X X X H STORAGE REGISTER STATE IS NOT CHANGED

X: Don’t Care

RCK RCLR

FIRST STAGE OF SHIFT REGISTER GOES LOW

OTHER STAGES STORE THE DATA OF PREVI-

OUS STAGE, RESPECTIVELY

FIRST STAGE OF SHIFT REGISTER GOES HIGH

OTHER STAGES STORE THE DATA OF PREVI-

OUS STAGE, RESPECTIVELY

SHIFT REGISTER DATA IS STORED IN THE

OUTPUTS

STORAGE REGISTER

2/14

Figure 3: Logic Diagram

74VHC594

This logi c di agram has not be used to est i m ate propaga tion delays

3/14

74VHC594

Figure 4: Timing Chart

Table 4: Absolute Maximum Ratings

Symbol Parameter Value Unit

V

V

V

I

I

OK

I

or I

I

CC

T

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied

4/14

Supply Voltage

CC

DC Input Voltage

I

DC Output Voltage -0.5 to VCC + 0.5

O

DC Input Diode Current

IK

DC Output Diode Current
DC Output Current

O

DC VCC or Ground Current

GND

Storage Temperature

stg

Lead Temperature (10 sec)

L

-0.5 to +7.0 V

-0.5 to +7.0 V
V

- 20 mA

± 20 mA
± 25 mA
± 50 mA

-65 to +150 °C

300 °C

74VHC594

Table 5: Recommended Operating Conditions

Symbol Parameter Value Unit

V

V
V
T

dt/dv

Supply Voltage

CC

Input Voltage

I

Output Voltage 0 to V

O

Operating Temperature

op

Input Rise and Fall Time (note 1) (V
(V

= 3.3 ± 0.3V)

CC

= 5.0 ± 0.5V)

CC

2 to 5.5 V
0 to 5.5 V

CC

-55 to 125 °C
0 to 100

0 to 20

V

ns/V

1) VI from 30 % t o 70% of V

CC

Table 6: DC Specifications

Symbol Parameter

V

V

V

High Level Input

IH

Voltage

V

Low Level Input

IL

Voltage

High Level Output

OH

Voltage

Low Level Output

OL

Voltage

Input Leakage

I

I

Current
Power Off Leakage

I

off

Current

I

Quiescent Supply

CC

Current

3.0 to

3.0 to

Test Condition Value

V

(V)

CC

T

A

Min. Typ. Max. Min. Max. Min. Max.

-40 to 85°C -55 to 125°C

= 25°C

2.0 1.5 1.5 1.5

5.5

0.7V

CC

0.7V

CC

0.7V

CC

2.0 0.5 0.5 0.5

5.5

2.0

3.0

4.5

3.0

4.5

2.0

3.0

4.5

3.0

4.5

0 to

5.5
0

5.5

IO=-50 µA

=-50 µA

I

O

I

=-50 µA

O

=-4 mA

I

O

=-8 mA

I

O

IO=50 µA
I

=50 µA

O

=50 µA

I

O

=4 mA

I

O

=8 mA

I

O

V

= 5.5V or GND

I

= 0 to 5V

V

I

= VCC or GND

V

I

0.3V

CC

1.9 2.0 1.9 1.9

2.9 3.0 2.9 2.9

4.4 4.5 4.4 4.4

2.58 2.48 2.4

3.94 3.8 3.7

0.0 0.1 0.1 0.1

0.0 0.1 0.1 0.1

0.0 0.1 0.1 0.1

0.36 0.44 0.55

0.36 0.44 0.55

± 0.1 ± 1 ± 1 µA

± 0.1 ± 5 ± 5 µA

44040µA

0.3V

CC

0.3V

CC

Unit

V

V

V

V

5/14