The 74HC245; 74HCT245 is a high-speed Si-gate CMOS device and is pin compatible
with Low-Power Schottky TTL (LSTTL).
The 74HC245; 74HCT245 is an octal transceiver featuring non-inverting 3-state bus
compatible outputs in both send and receive directions. The 74HC245; 74HCT245
features an output enable input (OE) for easy cascading and a send/receive input (DIR)
for direction control. OE controls the outputs so that the buses are effectively isolated.
The 74HC245; 74HCT245 is similar to the 74HC640; 74HCT640 but has true
(non-inverting) outputs.
2.Features
■ Octal bidirectional bus interface
■ Non-inverting 3-state outputs
■ Multiple package options
■ Complies with JEDEC standard no. 7A
■ ESD protection:
◆ HBM EIA/JESD22-A114-B exceeds 2000 V
◆ MM EIA/JESD22-A115-A exceeds 200 V
■ Specified from −40 °Cto+85°C and from −40 °C to +125 °C
3.Quick reference data
Table 1:Quick reference data
GND = 0 V; T
SymbolParameterConditionsMinTypMaxUnit
Type 74HC245
, t
t
PHL
C
I
C
I/O
C
PD
Type 74HCT245
, t
t
PHL
amb
propagation delay
PLH
An to Bn or Bn to An
input capacitance-3.5-pF
input/output capacitance-10-pF
power dissipation
capacitance per
transceiver
propagation delay
PLH
An to Bn or Bn to An
=25°C; tr=tf= 6 ns.
CL=15pF;
V
=5V
CC
VI= GND to V
CL=15pF;
V
=5V
CC
CC
-7-ns
[1]
-30-pF
-10-ns
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
Table 1:Quick reference data
GND = 0 V; T
=25°C; tr=tf= 6 ns.
amb
…continued
SymbolParameterConditionsMinTypMaxUnit
C
I
C
I/O
C
PD
input capacitance-3.5-pF
input/output capacitance-10-pF
power dissipation
capacitance per
VI= GND to
V
− 1.5 V
CC
[1]
-30-pF
transceiver
[1] CPDis used to determine the dynamic power dissipation (PD in µW):
PD=CPD× V
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;
∑ (CL× V
2
× fi× N+∑ (CL× V
CC
2
× fo) = sum of outputs.
CC
2
× fo) where:
CC
4.Ordering information
Table 2:Ordering information
Type numberPackage
Temperature range NameDescriptionVersion
74HC245N−40 °C to +125 °CDIP20plastic dual in-line package; 20 leads (300 mil)SOT146-1
74HC245D−40 °C to +125 °CSO20plastic small outline package; 20 leads;
body width 7.5 mm
74HC245PW−40 °C to +125 °CTSSOP20plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
74HC245DB−40 °C to +125 °CSSOP20plastic shrink small outline package; 20 leads;
body width 5.3 mm
74HC245BQ−40 °C to +125 °CDHVQFN20 plastic dual-in-line compatible thermal enhanced
very thin quad flat packageno leads; 20 terminals;
body 2.5 × 4.5 × 0.85 mm
74HCT245N−40 °C to +125 °CDIP20plastic dual in-line package; 20 leads (300 mil)SOT146-1
74HCT245D−40 °C to +125 °CSO20plastic small outline package; 20 leads;
body width 7.5 mm
74HCT245PW−40 °C to +125 °CTSSOP20plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
74HCT245DB−40 °C to +125 °CSSOP20plastic shrink small outline package; 20 leads;
body width 5.3 mm
74HCT245BQ−40 °C to +125 °CDHVQFN20 plastic dual-in-line compatible thermal enhanced
very thin quad flat package no leads; 20 terminals;
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
SymbolParameterConditionsMinTypMaxUnit
=25°C
T
amb
V
IH
V
IL
V
OH
V
OL
I
LI
I
OZ
I
CC
HIGH-level input voltageVCC= 4.5 V to 5.5 V2.01.6-V
LOW-level input voltageVCC= 4.5 V to 5.5 V-1.20.8V
HIGH-level output voltageVI=VIHor VIL; VCC= 4.5 V
Product data sheetRev. 03 — 31 January 200510 of 22
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
Table 9:Dynamic characteristics type 74HC245
…continued
GND = 0 V; test circuit see Figure 7.
SymbolParameterConditionsMinTypMaxUnit
t
, t
PZH
, t
t
PHZ
, t
t
THL
= −40 °C to +125 °C
T
amb
, t
t
PHL
, t
t
PZH
, t
t
PHZ
, t
t
THL
3-state output enable time OE to
PZL
An or
OE to Bn
3-state output disable time OE to
PLZ
An or
OE to Bn
output transition timesee Figure 5
TLH
propagation delay An to Bn or Bn
PLH
to An
3-state output enable time OE to
PZL
An or
OE to Bn
3-state output disable time OE to
PLZ
An or
OE to Bn
output transition timesee Figure 5
TLH
Figure 6
see
= 2.0 V--190ns
V
CC
= 4.5 V--38ns
V
CC
= 6.0 V--33ns
V
CC
Figure 6
see
= 2.0 V--190ns
V
CC
= 4.5 V--38ns
V
CC
= 6.0 V--33ns
V
CC
= 2.0 V--75ns
V
CC
= 4.5 V--15ns
V
CC
= 6.0 V--13ns
V
CC
see Figure 5
= 2.0 V--135ns
V
CC
= 4.5 V--27ns
V
CC
= 6.0 V--23ns
V
CC
Figure 6
see
= 2.0 V--225ns
V
CC
= 4.5 V--45ns
V
CC
= 6.0 V--38ns
V
CC
Figure 6
see
= 2.0 V--225ns
V
CC
= 4.5 V--45ns
V
CC
= 6.0 V--38ns
V
CC
= 2.0 V--90ns
V
CC
= 4.5 V--18ns
V
CC
= 6.0 V--15ns
V
CC
[1] CPDis used to determine the dynamic power dissipation (PD in µW):
PD=CPD× V
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;
∑ (CL× V
Product data sheetRev. 03 — 31 January 200511 of 22
2
× fi× N+∑ (CL× V
CC
2
× fo) = sum of outputs.
CC
2
× fo) where:
CC
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
Table 10: Dynamic characteristics type 74HCT245
GND = 0 V; test circuit see Figure 7.
SymbolParameterConditionsMinTypMaxUnit
= 25 °C
T
amb
, t
t
PHL
, t
t
PZH
, t
t
PHZ
, t
t
THL
C
PD
= −40 °C to +85 °C
T
amb
, t
t
PHL
, t
t
PZH
, t
t
PHZ
, t
t
THL
= −40 °C to +125 °C
T
amb
, t
t
PHL
, t
t
PZH
, t
t
PHZ
, t
t
THL
propagation delay An to Bn or Bn
PLH
to An
3-state output enable time OE to
PZL
An or
OE to Bn
3-state output disable time OE to
PLZ
An or
OE to Bn
output transition timeVCC = 4.5 V; see Figure 5-512ns
TLH
power dissipation capacitance
see Figure 5
= 4.5 V-1222ns
V
CC
= 5.0 V; CL=15pF-10-ns
V
CC
= 4.5 V; see Figure 6- 1630ns
V
CC
= 4.5 V; see Figure 6- 1630ns
V
CC
VI= GND to VCC− 1.5 V
[1]
-30-pF
per transceiver
propagation delay An to Bn or Bn
PLH
VCC = 4.5 V; see Figure 5--28ns
to An
3-state output enable time OE to
PZL
An or
OE to Bn
3-state output disable time OE to
PLZ
An or
OE to Bn
output transition timeVCC = 4.5 V; see Figure 5--15ns
TLH
propagation delay An to Bn or Bn
PLH
= 4.5 V; see Figure 6--38ns
V
CC
= 4.5 V; see Figure 6--38ns
V
CC
VCC = 4.5 V; see Figure 5--33ns
to An
3-state output enable time OE to
PZL
An or
OE to Bn
3-state output disable time OE to
PLZ
An or
OE to Bn
output transition timeVCC = 4.5 V; see Figure 5--18ns
TLH
= 4.5 V; see Figure 6--45ns
V
CC
= 4.5 V; see Figure 6--45ns
V
CC
[1] CPDis used to determine the dynamic power dissipation (PD in µW):
PD=CPD× V
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;
∑ (CL× V
Product data sheetRev. 03 — 31 January 200513 of 22
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
V
mgk563
CC
open
PULSE
GENERATOR
V
CC
V
I
D.U.T
R
T
V
RL = 1 kΩ
O
C
50 pF
L
Test data is given in Table 12.
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 resistor.
Product data sheetRev. 03 — 31 January 200520 of 22
Philips Semiconductors
15. Data sheet status
74HC245; 74HCT245
Octal bus tranceiver; 3-state
Level Data sheet status
IObjective dataDevelopmentThis data sheet contains data from the objective specification for product development. Philips
IIPreliminary dataQualificationThis data sheet contains data from the preliminary specification. Supplementary data will be published
IIIProduct dataProductionThis data sheet contains data from the product specification. Philips Semiconductors reserves the
[1] Please consult the most recently issued data sheet before initiating or completing a design.
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at
URL http://www.semiconductors.philips.com.
[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
[1]
Product status
16. Definitions
Short-form specification — The data in a short-form specification is
extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with
the Absolute Maximum Rating System (IEC 60134). Stress above one or
more of the limiting values may cause permanent damage to the device.
These are stress ratings only and operation of the device at these or at any
other conditions above those given in the Characteristics sections of the
specification is not implied. Exposure to limiting values for extended periods
may affect device reliability.
Application information — Applications that are described herein for any
of these products are for illustrative purposes only. Philips Semiconductors
make no representation or warranty that such applications will be suitable for
the specified use without further testing or modification.
[2] [3]
Definition
Semiconductors reserves the right to change the specification in any manner without notice.
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.
right to make changes at any time in order to improve the design, manufacturing and supply.Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).
17. Disclaimers
Life support — These products are not designed for use in life support
appliances, devices, or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors
customers using or selling these products for use in such applications do so
at their own risk and agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to
make changes in the products - including circuits, standard cells, and/or
software - described or contained herein in order to improve design and/or
performance. When the product is in full production (status ‘Production’),
relevant changes will be communicated via a Customer Product/Process
Change Notification (CPCN). Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no
license or title under any patent, copyright, or mask work right to these
products, and makes no representations orwarranties that these productsare
free from patent, copyright,or mask work right infringement, unless otherwise
specified.
18. Contact information
For additional information, please visit: http://www.semiconductors.philips.com
For sales office addresses, send an email to: sales.addresses@www.semiconductors.philips.com
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner. The information presented in this document does
not form part of any quotation or contract, is believed to be accurate and reliable and may
be changed without notice. No liability will be accepted by the publisher for any
consequence of its use. Publication thereof does not convey nor imply any license under
patent- or other industrial or intellectual property rights.
Published in The Netherlands
Date of release: 31 January 2005
Document number: 9397 750 14502
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