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SN74AHCT594
SCLS417I – JUNE 1998 – REVISED DECEMBER 2014
SN74AHCT594 8-Bit Shift Registers With Output Registers
1 Features
2 Applications
•
•
•
•
•
•
•
1
•
•
•
•
Inputs Are TTL-Voltage Compatible
8-Bit Serial-In, Parallel-Out Shift Registers With
Storage
Independent Direct Overriding Clears on Shift and
Storage Registers
Independent Clocks for Both Shift and Storage
Registers
Latch-Up Performance Exceeds 100 mA Per
JESD, 78 Class II
ESD Protection Exceeds JESD 22
– 3500-V Human-Body Model
– 200-V Machine Model
– 2000-V Charged-Device Model
Network Switches
Power Infrastructure
PCs, Notebooks
Health and Fitness, Wearables
Tests and Measurements
3 Description
The SN74AHCT594 device contains an 8-bit serial-in,
parallel-out shift register that feeds an 8-bit D-type
storage register.
Device Information(1)
PART NUMBER
SN74AHCT594
PACKAGE
BODY SIZE (NOM)
PDIP (16)
19.30 mm × 6.35 mm
SSOP (16)
6.50 mm × 5.30 mm
TSSOP (16)
5.00 mm × 4.40 mm
SOP (16)
10.20 mm × 5.30 mm
SOIC (16)
9.00 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematic
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
SN74AHCT594
SCLS417I – JUNE 1998 – REVISED DECEMBER 2014
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Simplified Schematic.............................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
8
1
1
1
1
2
3
4
Absolute Maximum Ratings ...................................... 4
ESD Ratings ............................................................ 4
Recommended Operating Conditions....................... 4
Thermal Information .................................................. 5
Electrical Characteristics........................................... 5
Timing Requirements, VCC = 5 V ± 0.5 V.................. 5
Switching Characteristics, VCC = 5 V ± 0.5 V............ 6
Noise Characteristics ................................................ 6
Operating Characteristics.......................................... 6
Typical Characteristics ............................................ 6
Parameter Measurement Information .................. 7
9
Detailed Description .............................................. 8
9.1
9.2
9.3
9.4
Overview ...................................................................
Functional Block Diagram .........................................
Feature Description...................................................
Device Functional Modes..........................................
8
8
9
9
10 Application and Implementation........................ 10
10.1 Application Information.......................................... 10
10.2 Typical Application ............................................... 10
11 Power Supply Recommendations ..................... 11
12 Layout................................................................... 12
12.1 Layout Guidelines ................................................. 12
12.2 Layout Example .................................................... 12
13 Device and Documentation Support ................. 12
13.1
13.2
13.3
13.4
Related Links ........................................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
12
12
12
12
14 Mechanical, Packaging, and Orderable
Information ........................................................... 12
5 Revision History
Changes from Revision H (June 1998) to Revision I
Page
•
Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table,
Typical Characteristics, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
•
Deleted Ordering Information table. ....................................................................................................................................... 1
2
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6 Pin Configuration and Functions
Pin Functions
PIN
NO.
NAME
TYPE
DESCRIPTION
1
QB
O
Output B
2
QC
O
Output C
3
QD
O
Output D
4
QE
O
Output E
5
QF
O
Output F
6
QG
O
Output G
7
QH
O
Output H
8
GND
—
Ground Pin
9
QH'
I
QH inverted
10
SRCLR
I
Serial Clear
11
SRCLK
I
Serial Clock
12
RCLK
I
Storage Clock
13
RCLR
I
Storage Clear
14
SER
I
Serial Input
15
QA
O
Output A
16
VCC
—
Power pin
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7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
VCC
MIN
MAX
Supply voltage range
–0.5
7
UNIT
V
(2)
–0.5
7
V
–0.5
VCC + 0.5
VI
Input voltage range
VO
Output voltage range (2)
IIK
Input clamp current
VI < 0
–20
mA
IOK
Output clamp current
VO < 0 or VO > VCC
±20
mA
IO
Continuous output current
VO = 0 to VCC
±25
mA
±75
mA
150
°C
Continuous current through VCC or GND
Tstg
(1)
(2)
Storage Temperature Range
–65
V
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
7.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
3500
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
2000
Machine Model (MM)
200
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. Manufacturing with
less than 500-V HBM is possible with the necessary precautions.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. Manufacturing with
less than 250-V CDM is possible with the necessary precautions.
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) (1)
SN74AHCT594
VCC
Supply voltage
VIH
High-level input voltage
VIL
Low-level input voltage
VI
Input voltage
VO
Output voltage
IOH
High-level output current
IOL
Low-level output current
∆t/∆v
Input transition rise and fall time
TA
Operating free-air temperature
(1)
4
MIN
MAX
4.5
5.5
UNIT
V
2
V
0.8
V
0
5.5
V
0
VCC
–8
–40
V
mA
8
mA
20
ns/V
125
°C
All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, (SCBA004).
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7.4 Thermal Information
SN74AHCT594
THERMAL METRIC (1)
D
DB
N
NS
PW
UNIT
16 PINS
RθJA
Junction-to-ambient thermal resistance
80.2
97.5
47.5
79.1
105.7
RθJC(top)
Junction-to-case (top) thermal resistance
39.1
47.7
34.9
35.4
40.4
RθJB
Junction-to-board thermal resistance
27.7
48.1
27.5
39.9
50.7
ψJT
Junction-to-top characterization parameter
9.9
9.8
19.8
5.4
3.7
ψJB
Junction-to-board characterization parameter
37.4
47.6
27.4
39.5
50.1
(1)
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
7.5 Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
VOH
VOL
II
ICC
ΔICC
(2)
Ci
(1)
(2)
TEST CONDITIONS
IOH = –50 µA
VCC
4.5 V
IOH = –8 mA
IOL = 50 µA
TA = 25°C
MIN
TYP
4.4
4.5
–40°C to 85°C
MAX
3.94
4.5V
IOL = 8 mA
MIN
–40°C to 125°C
MAX
MIN
4.4
4.4
3.8
3.8
MAX
UNIT
V
0.1
0.1
0.1
0.36
0.44
0.44
V
VI = 5.5 V or GND
0 V to
5.5 V
±0.1
±1 (1)
±1 (1)
µA
VI = VCC or GND, IO = 0
5.5 V
2
20
20
µA
One input at 3.5 V,
Other inputs at VCC or GND
5.5 V
2
2.2
2.2
mA
10
10
10
pF
VI = VCC or GND
5V
2
On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V.
This is the increase in supply current for each input at one of the specified TTL voltage levels, rather than 0 V or VCC.
7.6 Timing Requirements, VCC = 5 V ± 0.5 V
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 2)
TA = 25°C
PARAMETER
tw
tsu
th
(1)
Pulse duration
Setup time
Hold time
MIN
RCLK or SRCLK high or low
–40°C to 85°C
MAX
MIN
MAX
–40°C to 125°C
MIN
5
5.5
6.5
RCLR or SRCLR low
5.2
5.5
6
SER before SRCLK↑
3
3
3.5
SRCLK↑ before RCLK↑ (1)
5
5
5.5
SRCLR low before RCLK↑
5
5
5.5
SRCLR high (inactive) before
SRCLK↑
2.9
3.3
4
RCLR high (inactive) before
RCLK↑
3.4
3.8
4.5
2
2
2.5
SER after SRCLK↑
MAX
UNIT
ns
ns
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.
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7.7 Switching Characteristics, VCC = 5 V ± 0.5 V
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 2)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
LOAD
CAPACITANCE
fmax
tPLH
–40°C to 85°C
MAX
CL = 15 pF
135 (1)
170 (1)
115
115
CL = 50 pF
120
140
95
95
MAX
MIN
MAX
1
6.5
1
7.5
3.7 (1)
6.5 (1)
1
6.9
1
7.8
3.7 (1)
6.8 (1)
1
7.2
1
8
4.1 (1)
7.2 (1)
1
7.6
1
8.5
6.2
UNIT
MHz
(1)
3.3
(1)
MIN
–40°C to 125°C
TYP
RCLK
QA – QH
CL = 15 pF
SRCLK
QH'
CL = 15 pF
tPHL
RCLR
QA – QH
CL = 15 pF
4.5 (1)
7.6 (1)
1
8.2
1
9.5
tPHL
SRCLR
QH'
CL = 15 pF
4.1 (1)
7.1 (1)
1
7.6
1
8.5
RCLK
QA – QH
CL = 50 pF
4.9
7.8
1
8.3
1
9.5
5.8
8.9
1
9.7
1
10.5
SRCLK
QH'
CL = 50 pF
5.5
8.6
1
9.7
1
10
6
9.2
1
10.1
1
11
tPHL
RCLR
QA – QH
CL = 50 pF
6.6
10
1
10.7
1
11.5
ns
tPHL
SRCLR
QH'
CL = 50 pF
6
9.2
1
10.1
1
11
ns
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
(1)
TA = 25°C
MIN
ns
ns
ns
ns
ns
On products compliant to MIL-PRF-38535, this parameter is not production tested.
7.8 Noise Characteristics (1)
VCC = 5 V, CL = 50 pF, TA = 25°C
SN74AHCT594
PARAMETER
MIN
TYP
MAX
UNIT
VOL(P)
Quiet output, maximum dynamic VOL
1
V
VOL(V)
Quiet output, minimum dynamic VOL
–0.6
V
VOH(V)
Quiet output, minimum dynamic VOH
3.8
V
VIH(D)
High-level dynamic input voltage
VIL(D)
Low-level dynamic input voltage
(1)
2
V
0.8
V
TYP
UNIT
112
pF
Characteristics are for surface-mount packages only.
7.9 Operating Characteristics
VCC = 5 V, TA = 25°C
PARAMETER
Cpd
TEST CONDITIONS
Power dissipation capacitance
No load, f = 1 MHz
7.10 Typical Characteristics
6
5
TPD (ns)
4
3
2
1
TPD in ns
0
-100
-50
0
50
Temperature (qC)
100
150
D001
Figure 1. TPD vs Temperature
6
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8 Parameter Measurement Information
A.
CL includes probe and jig capacitance.
B.
Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output
control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the
output control.
C.
All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 3 ns, tf
≤ 3 ns.
D.
The outputs are measured one at a time with one input transition per measurement.
E.
All parameters and waveforms are not applicable to all devices.
Figure 2. Load Circuit and Voltage Waveforms
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9 Detailed Description
9.1 Overview
The ’AHCT594 devices contain an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage
register. Separate clocks and direct overriding clear (SRCLR, RCLR) inputs are provided on both the shift and
storage registers. A serial (QH′) output is provided for cascading purposes.
Both the shift register (SRCLK) and storage register (RCLK) clocks are positive edge triggered. If both clocks are
connected together, the shift register always is one count pulse ahead of the storage register.
9.2 Functional Block Diagram
8
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9.3 Feature Description
•
•
•
•
VCC is optimized at 5 V
Allow Up voltage translation from 3.3 V to 5 V
– Inputs accept VIH levels of 2 V
Slow edge rates minimize output ringing
Inputs are TTL-Voltage compatible
9.4 Device Functional Modes
Table 1. Function Table
INPUTS
FUNCTION
SER
SRCLK
SRCLR
RCLK
RCLR
X
X
L
X
X
Shift register is cleared.
L
↑
H
X
X
First stage of shift register goes low.
Other stages store the data of previous stage,
respectively.
H
↑
H
X
X
First stage of shift register goes high.
Other stages store the data of previous stage,
respectively.
L
↓
H
X
X
Shift-register state is not changed.
X
X
X
X
L
Storage register is cleared.
X
X
X
↑
H
Shift-register data is stored in the storage register.
X
X
X
↓
H
Storage-register state is not changed.
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10 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
SN74AHCT594 is a low drive CMOS device that can be used for a multitude of bus interface type applications
where output ringing is a concern. The low drive and slow edge rates will minimize overshoot and undershoot on
the outputs. The input switching levels have been lowered to accommodate TTL inputs of 0.8 V VIL and 2 V VIH.
This feature makes it Ideal for translating up from 3.3 V to 5 V. Figure 4 shows this type of translation.
10.2 Typical Application
Digital signals from control unit
+5 V Power
QB
QC
QD
QE
QF
QG
QH
GND
+
LED
LED
Resistor
500 Ω
+
LED
+
Resistor
500 Ω
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
LED
Resistor
500 Ω
+
LED
Resistor
500 Ω
VCC
QA
SER
RCLR
RCLK
SRCLK
SRCLR
QH’
+
LED
Resistor
500 Ω
+
+
LED
Resistor
500 Ω
LED
Resistor
500 Ω
+
LED
Resistor
500 Ω
Figure 3. Application Schematic
10.2.1 Design Requirements
This device uses CMOS technology and has balanced output drive. Care should be taken to avoid bus
contention because it can drive currents that would exceed maximum limits. The high drive will also create fast
edges into light loads so routing and load conditions should be considered to prevent ringing.
10
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Typical Application (continued)
10.2.2 Detailed Design Procedure
1. Recommended Input conditions
– Rise time and fall time specs see (Δt/ΔV) in Recommended Operating Conditions table.
– Specified High and low levels. See (VIH and VIL) in Recommended Operating Conditions table.
– Inputs are overvoltage tolerant allowing them to go as high as 5.5 V at any valid Vcc
2. Recommend output conditions
– Load currents should not exceed 25 mA per output and 75 mA total for the part
– Outputs should not be pulled above VCC
Voltage
10.2.3 Application Curves
Time
Figure 4. Typical Application Curve
11 Power Supply Recommendations
The power supply can be any voltage between the MIN and MAX supply voltage rating located in the
Recommended Operating Conditions table.
Each VCC pin should have a good bypass capacitor to prevent power disturbance. For devices with a single
supply, 0.1 μF is recommended. If there are multiple VCC pins, 0.01 μF or 0.022 μF is recommended for each
power pin. It is acceptable to parallel multiple bypass caps to reject different frequencies of noise. A 0.1 μF and
1 μF are commonly used in parallel. The bypass capacitor should be installed as close to the power pin as
possible for best results.
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12 Layout
12.1 Layout Guidelines
When using multiple bit logic devices, inputs should not float. In many cases, functions or parts of functions of
digital logic devices are unused. Some examples are when only two inputs of a triple-input AND gate are used,
or when only 3 of the 4-buffer gates are used. Such input pins should not be left unconnected because the
undefined voltages at the outside connections result in undefined operational states.
Specified in Figure 5 are rules that must be observed under all circumstances. All unused inputs of digital logic
devices must be connected to a high or low bias to prevent them from floating. The logic level that should be
applied to any particular unused input depends on the function of the device. Generally they will be tied to GND
or VCC, whichever makes more sense or is more convenient. It is acceptable to float outputs unless the part is a
transceiver. If the transceiver has an output enable pin, it will disable the outputs section of the part when
asserted. This will not disable the input section of the I/Os so they also cannot float when disabled.
12.2 Layout Example
Vcc
Input
Unused Input
Output
Output
Unused Input
Input
Figure 5. Layout Diagram
13 Device and Documentation Support
13.1 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 2. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
SN74AHCT594
Click here
Click here
Click here
Click here
Click here
13.2 Trademarks
All trademarks are the property of their respective owners.
13.3 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
13.4 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
14 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
12
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PACKAGE OPTION ADDENDUM
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13-Aug-2021
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
SN74AHCT594D
ACTIVE
SOIC
D
16
40
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
AHCT594
SN74AHCT594DBR
ACTIVE
SSOP
DB
16
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
HB594
SN74AHCT594DG4
ACTIVE
SOIC
D
16
40
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
AHCT594
SN74AHCT594DR
ACTIVE
SOIC
D
16
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
AHCT594
SN74AHCT594N
ACTIVE
PDIP
N
16
25
RoHS &
Non-Green
NIPDAU
N / A for Pkg Type
-40 to 125
SN74AHCT594N
SN74AHCT594NSR
ACTIVE
SO
NS
16
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
AHCT594
SN74AHCT594PW
ACTIVE
TSSOP
PW
16
90
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
HB594
SN74AHCT594PWR
ACTIVE
TSSOP
PW
16
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
HB594
SN74AHCT594PWRG4
ACTIVE
TSSOP
PW
16
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
HB594
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of