1. General description
The 74HC7540; 74HCT7540 is an 8-bit inverting buffer/line driver with Schmitt-trigger
inputs and 3-state outputs. The device features two output enables (OE1 and OE2). A
HIGH on OEn causes the output s to assu me a high -imped ance OFF-st ate. In put s inclu de
clamp diodes. This enables the use of current limiting resistors to interface inputs to
voltages in excess of VCC. Schmitt trigger inputs transform slowly changing input signals
into sharply defined jitter-free ou tput signals.
2. Features and benefits
Input levels:
For 74HC7540: CMOS leve l
For 74HCT7540: TTL level
Inverting outputs
Low-power dissipation
Complies with JEDEC standard no. 7 A
Multiple package options
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115 -A ex ce ed s 20 0 V
Specified from 40 C to +85 C and from 40 C to +125 C
3. Ordering information
74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
Rev. 5 — 26 May 2016 Product data sheet
Table 1. Ordering information
Type number Package
Temp erature range Name Description Version
74HC7540D 40 C to +125 C SO20 plastic small outline package; 20 leads;
body width 7.5 mm SOT163-1
74HCT7540D
74HC7540DB 40 C to +125 C SSOP20 plastic shrink small outline package; 20 leads;
body width 5.3 mm SOT339-1
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 2 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
4. Functional diagram
5. Pinning information
5.1 Pinning
Fig 1. Logic symbol Fig 2. IEC logic symbol
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Fig 3. Pin configuration SO20 Fig 4. Pin configuration SSOP20
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 3 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
5.2 Pin description
6. Functional description
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
7. Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] For SO20 package: above 70 C the value of Ptot derates linearly with 8 mW/K.
For SSOP20 package: above 60 C the value of Ptot derates linearly with 5.5 mW/K.
Table 2. Pin de scription
Symbol Pin Description
OE1 1 output enable input (active LOW)
A0 to A7 2, 3, 4, 5, 6, 7, 8, 9 data input
GND 10 ground (0 V)
Y0 to Y7 18, 17, 16, 15, 14, 13, 12, 11 data output
OE2 19 output enable input (active LOW)
VCC 20 supply voltage
Table 3. Functional table[1]
Control Input Output
OE1OE2An Yn
LL L H
LL H L
XH X Z
HX X Z
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Min Max Unit
VCC supply voltage 0.5 +7 V
IIK input clamping current VI < 0.5 V or VI>V
CC +0.5 V [1] -20 mA
IOK output clamping current VO<0.5 V or VO>V
CC +0.5V [1] -20 mA
IOoutput curren t 0.5 V < VO < VCC +0.5V - 35 mA
ICC supply current - 70 mA
IGND ground current 70 - mA
Tstg storage temperature 65 +150 C
Ptot total power dissipa tion SO20, SSOP20 [2] -500mW
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 4 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
8. Recommended operating conditions
9. Static characteristics
Table 5. Re commended operating conditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter Conditions 74HC7540 74HCT7540 Unit
Min Typ Max Min Typ Max
VCC supply voltage 2.0 5.0 6.0 4.5 5.0 5.5 V
VIinput voltage 0 - VCC 0-V
CC V
VOoutput voltage 0 - VCC 0-V
CC V
Tamb ambient temperature 40 +25 +125 40 +25 +125 C
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C
to +85 CTamb = 40 C
to +125 CUnit
Min Typ Max Min Max Min Max
74HC7540
VOH HIGH-level
output voltage VI= VT+ or VT
IO = 20 A; VCC = 2.0 V 1.9 2.0 - 1.9 - 1.9 - V
IO = 20 A; VCC = 4.5 V 4.4 4.5 - 4.4 - 4.4 - V
IO = 20 A; VCC = 6.0 V 5.9 6.0 - 5.9 - 5.9 - V
IO = 6.0 mA; VCC = 4.5 V 3.98 4.32 - 3.84 - 3.7 - V
IO = 7.8 mA; VCC = 6.0 V 5.48 5.81 - 5.34 - 5.2 - V
VOL LOW-level
output voltage VI= VT+ or VT
IO = 20 A; VCC = 2.0 V - 0 0.1 - 0.1 - 0.1 V
IO = 20 A; VCC = 4.5 V - 0 0.1 - 0.1 - 0.1 V
IO = 20 A; VCC = 6.0 V - 0 0.1 - 0.1 - 0.1 V
IO = 6.0 mA; VCC = 4.5 V - 0.15 0.26 - 0.33 - 0.4 V
IO = 7.8 mA; VCC = 6.0 V - 0.16 0.26 - 0.33 - 0.4 V
IIinput leakage
current VI = VCC or GND; VCC =6.0V - - 0.1 - 1.0 - 1.0 A
IOZ OFF-state
output current VI=V
T+ or VT; VCC =6.0V;
VO=V
CC or GND --0.5 - 5.0 - 10 A
ICC supply current VI = VCC or GND; IO=0A;
VCC =6.0V - - 8.0 - 80 - 160 A
CIinput
capacitance -3.5- - - - - pF
74HCT7540
VOH HIGH-level
output voltage VI= VT+ or VT; VCC = 4.5 V
IO = 20 A 4.4 4.5 - 4.4 - 4.4 - V
IO = 6.0 mA 3.98 4.32 - 3.84 - 3.7 - V
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 5 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
10. Dynamic characteristics
VOL LOW-level
output voltage VI= VT+ or VT; VCC = 4.5 V
IO = 20 A; - 0 0.1 - 0.1 - 0.1 V
IO = 6.0 mA; - 0.15 0.26 - 0.33 - 0.4 V
IIinput leakage
current VI = VCC or GND; VCC =5.5V - - 0.1 - 1.0 - 1.0 A
IOZ OFF-state
output current VI=V
T+ or VT; VCC =5.5V;
VO=V
CC or GND --0.5 - 5.0 - 10 A
ICC supply current VI=V
CC or GND; IO = 0 A;
VCC =5.5V - - 8.0 - 80 - 160 A
ICC additional
supply current per input pin; IO=0A;
VI=V
CC 2.1 V;
other inputs at VCC or GND;
VCC = 4.5 V to 5.5 V
An input - 20 72 - 90 - 98 A
OEn input - 130 468 - 585 - 637 A
CIinput
capacitance -3.5- - - - - pF
Table 6. Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C
to +85 CTamb = 40 C
to +125 CUnit
Min Typ Max Min Max Min Max
Table 7. Dynamic characteristics
GND = 0 V; CL= 50 pF; for test circuit see Figure 7.
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C to +125 CUnit
Min Typ Max Max (85 C) Max (125 C)
74HC7540
tpd propagation delay An to Yn; see Figure 5 [1]
VCC = 2.0 V - 39 120 150 180 ns
VCC = 4.5 V - 14 24 30 36 ns
VCC = 5.0 V; CL=15pF - 11 - - - ns
VCC = 6.0 V - 11 20 26 31 ns
ten enable time OEntoYn; see Figure 6 [1]
VCC = 2.0 V - 41 150 190 225 ns
VCC = 4.5 V - 15 30 38 45 ns
VCC = 6.0 V - 12 26 33 38 ns
tdis disable time OEntoYn; see Figure 6 [1]
VCC = 2.0 V - 52 150 190 225 ns
VCC = 4.5 V - 19 30 38 45 ns
VCC = 6.0 V - 15 26 33 38 ns
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 6 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
[1] tpd is the same as tPLH and tPHL.
ten is the same as tPZL and tPZH.
tdis is the same as tPLZ and tPHZ.
[2] tt is the same as tTHL and tTLH.
[3] CPD is used to determine the dynamic power dissipation (PD in W):
PD=C
PD VCC2fiN+ (CLVCC2fo) 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;
(CLVCC2fo) = sum of outputs.
tttransition time see Figure 5 [2]
VCC = 2.0 V - 14 60 75 90 ns
VCC = 4.5 V - 5 12 15 18 ns
VCC = 6.0 V - 4 10 1 3 15 ns
CPD power dissipation
capacitance per package;
VI=GNDtoV
CC
[3] -29- - - pF
74HCT7540
tpd propagation delay An to Yn; see Figure 5 [1]
VCC = 4.5 V - 19 32 40 48 ns
VCC = 5.0 V; CL=15pF - 16 - - - ns
ten enable time OEntoYn; see Figure 6 [1]
VCC = 4.5 V - 19 32 40 48 ns
tdis disable time OEntoYn; see Figure 6 [1]
VCC = 4.5 V - 20 32 40 48 ns
tttransition time VCC = 4.5 V; see Figure 5 [2] - 5 12 15 18 ns
CPD power dissipation
capacitance per package;
VI=GNDtoV
CC 1.5 V [3] -31- - - pF
Table 7. Dynamic characteristics
GND = 0 V; CL= 50 pF; for test circuit see Figure 7.
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C to +125 CUnit
Min Typ Max Max (85 C) Max (125 C)
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 7 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
11. Waveforms
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 5. Input to output propagation delays
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W7+/ W7/+
W3/+
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9090
90
W3+/
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6. 3-state enable and disab l e tim es
DDD
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/2:
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HQDEOHG
RXWSXWV
GLVDEOHG
90
W3=+
90
W3=/
Table 8. Measur ement points
Type Input Output
VMVMVXVY
74HC7540 0.5VCC 0.5VCC 0.1VCC 0.9VCC
74HCT75401.3V1.3V0.1V
CC 0.9VCC
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 8 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
Test data is given in Table 9.
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator
CL = Load capacitance including jig and probe capacitance
RL = Load resistance
S1 = Test selection switch
Fig 7. Test circuit for measuring switching times
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9
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Table 9. Test data
Type Input Load S1 position
VItr, tfCLRLtPHL, tPLH tPZH, tPHZ tPZL, tPLZ
74HC7540 VCC 6ns 15pF, 50 pF 1kopen GND VCC
74HCT7540 3 V 6 ns 15 pF, 50 pF 1 kopen GND VCC
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 9 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
12. Transfer characteristics
13. Transfer characteristics waveforms
Table 10. Transfer characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V); see Figure 8 and Figure 9.
Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C
to +85 CTamb = 40 C
to +125 CUnit
Min Typ Max Min Max Min Max
74HC7540
VT+ positive-going
threshold
voltage
VCC = 2.0 V - - 1.5 - 1.5 - 1 .5 V
VCC = 4.5 V - - 3.15 - 3.15 - 3.15 V
VCC = 6.0 V - - 4.2 - 4.2 - 4.2 V
VTnegative-going
threshold
voltage
VCC = 2.0 V 0.3 - - 0.3 - 0.3 - V
VCC = 4.5 V 1.35 - - 1.35 - 1.35 - V
VCC = 6.0 V 1.8 - - 1.8 - 1.8 - V
VHhysteresis
voltage VCC = 2.0 V 0.1 0.20 - 0.1 - 0.1 - V
VCC = 4.5 V 0.25 0.40 - 0.25 - 0.25 - V
VCC = 6.0 V 0.3 0.5 - 0.3 - 0.3 - V
74HCT7540
VT+ positive-going
threshold
voltage
VCC = 4.5 V - - 2.0 - 2.0 - 2 .0 V
VCC = 5.5 V - - 2.1 - 2.1 - 2 .1 V
VTnegative-going
threshold
voltage
VCC = 4.5 V 0.7 - - 0.64 - 0.6 - V
VCC = 5.5 V 0.8 - - 0.74 - 0.7 - V
VHhysteresis
voltage VCC = 4.5 V 0.17 0.23 - - - - - V
VCC = 5.5 V 0.17 0.23 - - - - - V
Fig 8. Transfer characteristics Fig 9. Transfer characteristics definitions
PQD
92
9,
9+
97
97
PQD
92
9,9+
97
97
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 10 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
14. Package outline
Fig 10. Package outline SOT163-1 (SO20)
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 11 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
Fig 11. Package outline SOT339-1 (SSOP20)
81,7 $
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© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 12 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
15. Abbreviations
16. Revision history
Table 11. Ab br eviations
Acronym Description
CMOS Complementary Metal-Oxide Semiconductor
DUT Device Under Test
ESD ElectroStatic Discharge
HBM Human Body Model
LSTTL Low-power Schottky Transistor-Transistor Logic
MM Machine Model
Table 12. Revision history
Document ID Release date Data sheet statu s Change notice Supersedes
74HC_HCT7540 v.5 20160526 Product data sheet - 74HC_HCT7540 v.4
Modifications: •Type numbers 74HC7540N and 74HCT7540N (SOT146-1) removed.
•Table 6: con ditions for OFF-state output current have changed.
74HC_HCT7540 v.4 20121231 Product data sheet - 74HC_HCT7540 v.3
Modifications: •IOZ added to static characteristics table.
74HC_HCT7540 v.3 20120827 Product data sheet - 74HC_HCT7540_CNV v.2
Modifications: •The format of this data sheet has been redesigned to comply with the new identity
guidelines of NXP Semiconductors.
•Legal texts have been adapted to the new company name where appropriate .
74HC_HCT7540_CNV v .2 19970917 Product specification - -
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 13 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
17. Legal information
17.1 Data sheet status
[1] Please consult the most recently issued document before initiating or completing a design.
[2] The term ‘short data sheet’ is explained in section “Definitions”.
[3] The product status of de vice(s) descr ibed in th is document m ay have cha nged since thi s document w as publish ed and may di ffe r in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nexperia.com.
17.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. Nexperia does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liab ility for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and tit le. A short data sh eet is intended
for quick reference only and shou ld not b e relied u pon to cont ain det ailed and
full information. For detailed and full informatio n see the relevant full dat a
sheet, which is available on request via the local Nexperia sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall pre va il.
Product specificat ion — The information and data provided in a Product
data sheet shall define the specification of the product as agr eed between
Nexperia and its customer, unless Nexperia and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the Nexperia product is
deemed to off er functions and qualities beyond those described in the
Product data sheet.
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Limited warr a nty and liability — Information in this document is believed to
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Notwithstanding any damages that customer might incur for any reason
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Applications — Applications that are described herein for any of these
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representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and ope ration of their applications
and products using Nexperia products, and Nexperia
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Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — Nexperia
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Document status[1][2] Product status[3] Definition
Objective [short] data sheet Development This document contain s data from the objective specification for product development.
Preliminary [short] dat a sheet Qualification This document contains data from the preliminary specification.
Product [short] data sheet Production This document contains the product specification.
© Nexperia B.V. 2017. All rights reserved
74HC_HCT7540 All information provided in this document is subject to legal disclaimers.
Product data sheet Rev. 5 — 26 May 2016 14 of 15
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
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may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Non-automotive qualified products — Unless this data sheet expressly
states that this specific Nexperia product is automotive qualified,
the product is not suitable for automotive use. It i s neit her qualif ied nor test ed
in accordance with automotive testing or application requirements. Nexperia
accepts no liability for inclusion and/or use of
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automot ive specifications and standards, custome r
(a) shall use the product without Nexperia’s warranty of the
product for such au tomotive applications, use and specifications, and (b)
whenever customer uses the product for automotive applications beyond
Nexperia’s specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies Nexperia for any
liability, damages or failed product claims resulting from custome r design and
use of the product for automotive applications beyond Nexperia’s
standard warranty and Nexperia’s product specifications.
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
17.4 Trademarks
Notice: All referenced b rands, produc t names, service names and trademarks
are the property of their respective ow ners.
18. Contact information
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Nexperia 74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
19. Contents
1 General description. . . . . . . . . . . . . . . . . . . . . . 1
2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1
3 Ordering information. . . . . . . . . . . . . . . . . . . . . 1
4 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2
5 Pinning information. . . . . . . . . . . . . . . . . . . . . . 2
5.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
5.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
6 Functional description . . . . . . . . . . . . . . . . . . . 3
7 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 3
8 Recommended operating conditions. . . . . . . . 4
9 Static characteristics. . . . . . . . . . . . . . . . . . . . . 4
10 Dynamic characteristics . . . . . . . . . . . . . . . . . . 5
11 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
12 Transfer characteristics . . . . . . . . . . . . . . . . . . 9
13 Transfer characteristics waveforms. . . . . . . . . 9
14 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 10
15 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 12
16 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 12
17 Legal information. . . . . . . . . . . . . . . . . . . . . . . 13
17.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 13
17.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
17.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
17.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
18 Contact information. . . . . . . . . . . . . . . . . . . . . 14
19 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
© Nexperia B.V. 2017. All rights reserved
For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release:
26 May 2016
