The 74HC21 is a high-speed Si-gate CMOS device and is pin compatible with low-power
Schottky TTL (LSTTL). The 74HC21 is specified in compliance with JEDEC
standard no. 7A.
The 74HC21 provide the 4-input AND function.
2.Features
■ Low-power dissipation
■ Complies with JEDEC standard no. 7A
■ ESD protection:
◆ HBM EIA/JESD22-A114-B exceeds 2000 V
◆ MM EIA/JESD22-A115-A exceeds 200 V.
■ Multiple package options
■ Specified from −40 °Cto+80°C and from −40 °C to +125 °C.
3.Quick reference data
Table 1:Quick reference data
GND = 0 V; T
SymbolParameterConditionsMinTypMaxUnit
, t
t
PHL
C
I
C
PD
[1] CPD is 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
amb
PLH
CC
=25°C; tr=tf= 6 ns.
propagation delay nA,
nB, nC, nD to nY
input capacitance-3.5-pF
power dissipation
capacitance
2
× fi× N+∑(CL× V
CC
2
× fo) = sum of outputs.
CL=15pF;
V
CC
VI= GND to V
2
× fo) where:
CC
=5V
CC
-10-ns
[1]
-15-pF
Philips Semiconductors
74HC21
Dual 4-input AND gate
4.Ordering information
Table 2:Ordering information
Type number Package
Temperature range NameDescriptionVersion
74HC21N−40 °C to +125 °CDIP14plastic dual in-line package; 14 leads (300 mil)SOT27-1
74HC21D−40 °C to +125 °CSO14plastic small outline package; 14 leads; body width 3.9 mmSOT108-1
74HC21DB−40°C to +125 °CSSOP14 plastic shrink small outline package; 14 leads; body width
Product data sheetRev. 03 — 12 November 20047 of 15
Philips Semiconductors
74HC21
Dual 4-input AND gate
11. Dynamic characteristics
Table 8:Dynamic characteristics
GND = 0 V; tr=tf= 6 ns; CL= 50 pF; see Figure 7.
SymbolParameterConditionsMinTypMaxUnit
= 25 °C
T
amb
t
PHL
t
THL
C
T
t
PHL
t
THL
T
t
PHL
t
THL
, t
, t
PD
amb
, t
, t
amb
, t
, t
propagationdelay nA,nB,nC,nD
PLH
to nY
output transition timesee Figure 6
TLH
power dissipation capacitanceVI= GND to V
= −40 °C to +85 °C
propagationdelay nA,nB,nC,nD
PLH
to nY
output transition timesee Figure 6
TLH
= −40 °C to +125 °C
propagationdelay nA,nB,nC,nD
PLH
to nY
output transition timesee Figure 6
TLH
see Figure 6
= 2.0 V-33110ns
V
CC
= 4.5 V-1222ns
V
CC
= 6.0 V-1019ns
V
CC
= 5.0 V; CL=15pF-10-ns
V
CC
= 2.0 V-1975ns
V
CC
= 4.5 V-715ns
V
CC
= 6.0 V-613ns
V
CC
[1]
CC
-15-pF
see Figure 6
= 2.0 V--140ns
V
CC
= 4.5 V--28ns
V
CC
= 6.0 V--24ns
V
CC
= 2.0 V--95ns
V
CC
= 4.5 V--19ns
V
CC
= 6.0 V--16ns
V
CC
see Figure 6
= 2.0 V--165ns
V
CC
= 4.5 V--33ns
V
CC
= 6.0 V--28ns
V
CC
= 2.0 V--110ns
V
CC
= 4.5 V--22ns
V
CC
= 6.0 V--19ns
V
CC
[1] CPD is 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 — 12 November 20048 of 15
2
× fi× N+∑(CL× V
CC
2
× fo) = sum of outputs.
CC
2
× fo) where:
CC
Philips Semiconductors
12. Waveforms
74HC21
Dual 4-input AND gate
nA, nB, nC,
nD input
nY output
V
M
t
t
THL
PHL
V
M
t
PLH
t
TLH
001aab977
VM= 0.5 × VI.
Fig 6. Waveforms showing the input (nA, nB, nC, nD) to output (nY) propagation delays
and the output transition times
V
CC
PULSE
GENERATOR
V
I
D.U.T.
R
T
V
O
C
L
mna101
Test data is given in Table 9.
Definitions for test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
CL = Load capacitance including jig and probe capacitance.
Product data sheetRev. 03 — 12 November 200413 of 15
Philips Semiconductors
15. Data sheet status
74HC21
Dual 4-input AND gate
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 improvethe 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, andmakesno representations or warranties that these products are
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: 12 November 2004
Document number: 9397 750 13806
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