N74F244BD [NXP]
Octal buffers 3-State; 八路缓冲器三态
| 型号： | N74F244BD |
| 厂家： | 
NXP |
| 描述： | Octal buffers 3-State |
| 文件： | 总12页 (文件大小：97K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
74F244/74F244B
Octal buffers (3-State)
Product specification
IC15 Data Handbook
1994 Dec 05
Philip s Se m ic ond uc tors
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
FEATURES
• Octal bus interface
DESCRIPTION
The 74F244 is an octal buffer that is ideal for driving bus lines of
buffer memory address registers. The outputs are all capable of
sinking 64mA and sourcing up to 15mA, producing very good
capacitive drive characteristics. The device features two output
enables, OEa and OEb, each controlling four of the 3-State outputs.
• 3-State output buffer sink 64mA
• 15mA source current
• Guaranteed output skew less than 2.0ns (74F244B)
• Reduced ground bounce (74F244B)
The 74F244B is functionally equivalent to the 74F244. It has been
designed to reduce effects of ground noise. Other advantages are
noted in the features.
• Reduced I (74F244B)
CC
• Reduced loading (74F244B I = 40µA)
IL
TYPICAL
PROPAGATION
DELAY
TYPICAL SUPPLY
CURRENT (TOTAL)
TYPE
• Split lead frame offers increased noise immunity (74F244B)
• Industrial temperature range available (-40°C to +85°C) for
74F244
4.0ns
4.0ns
53mA
33mA
74F244
74F244B
• 74F244 available in SSOP Type II package
ORDERING INFORMATION
ORDER CODE
COMMERCIAL RANGE
DESCRIPTION
INDUSTRIAL RANGE
= 5V ±10%,
PKG DWG #
V
CC
= 5V ±10%,
V
CC
T
amb
= 0°C to +70°C
T
amb
= -40°C to +85°C
20-pin plastic DIP
20-pin plastic SOL
20-pin plastic SSOP II
N74F244N, N74F244BN
N74F244D, N74F244BD
N74F244DB
I74F244N
SOT146-1
SOT163-1
SOT339-1
I74F244D
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
74F (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
PINS
DESCRIPTION
Ian, Ibn
Data inputs (74F244)
Data inputs (74F244B)
1.0/2.67
20µA/1.6mA
20µA/40µA
20µA/1.0mA
20µA/40µA
15mA/64mA
1.0/0.067
1.0/1.67
OEa, OEb
Yan, Ybn
Output enable inputs (active low) (74F244)
Output enable inputs (active low) (74F244B)
Data outputs
1.0/0.067
750/106.7
NOTE: One (1.0) FAST unit load is defined as: 20µA in the high state and 0.6mA in the low state.
PIN CONFIGURATION
LOGIC SYMBOL
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
OEa
Ia0
V
CC
2
4
6
8
17 15 13 11
OEb
Ya0
Yb0
Ia1
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
Ib0
Yb1
Ia2
Ya1
1
OEa
OEb
19
Ib1
Yb2
Ia3
Ya2
Ib2
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
Yb3
Ya3
Ib3
18
16 14 12
3
5
7
9
GND 10
V
= Pin 20
GND = Pin 10
CC
SF00228
SF00227
2
1994 Dec 5
853-0357 14381
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
IEC/IEEE SYMBOL
FUNCTION TABLE
INPUTS
OUTPUTS
1
EN1
EN2
OEa
Ia
L
OEb
L
Ib
L
Ya
L
Yb
L
19
L
2
4
18
2D
1
L
H
H
X
L
H
X
H
Z
H
Z
16
14
H
6
NOTES:
H = High voltage level
12
3
8
17
2
L
X
Z
=
=
=
Low voltage level
Don’t care
High impedance ”off” state
5
15
13
11
7
9
SF00229
LOGIC DIAGRAM
17
15
3
5
2
18
16
Ib0
Yb0
Yb1
Yb2
Yb3
Ia0
Ya0
Ya1
Ya2
Ya3
4
Ib1
Ia1
13
7
9
6
14
12
Ib2
Ia2
11
19
8
Ib3
Ia3
1
OEb
OEa
V
= Pin 20
CC
GND = Pin 10
SF00230
3
1994 Dec 5
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)
SYMBOL
PARAMETER
RATING
-0.5 to +7.0
-0.5 to +7.0
-30 to +5
UNIT
V
V
CC
V
IN
Supply voltage
Input voltage
Input current
V
I
IN
mA
V
I
Voltage applied to output in high output state
Current applied to output in low output state
-0.5 to V
V
OUT
CC
128
mA
°C
OUT
Commercial range
0 to +70
T
Operating free air temperature range
Storage temperature range
amb
Industrial range
(74F244 only)
-40 to +85
°C
°C
T
stg
-65 to +150
RECOMMENDED OPERATING CONDITIONS
LIMITS
NOM
5.0
SYMBOL
PARAMETER
UNIT
MIN
4.5
MAX
V
CC
V
IN
V
IL
Supply voltage
5.5
V
V
High-level input voltage
Low-level input voltage
Input clamp current
2.0
0.8
–18
–15
64
V
I
I
mA
mA
mA
IK
High-level output current
Low-level output current
OH
ol
i
Commercial range
0
+70
°C
°C
T
amb
Operating free air temperature range
Industrial range
(74F244 only)
–40
+85
4
1994 Dec 5
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
TEST
CONDITIONS
SYMBOL
PARAMETER
UNIT
1
2
MIN
TYP
MAX
±10%V
±5%V
V
V
V
= MIN,
I
= -3mA
2.5
V
V
V
V
CC
CC
OH
V
High-level output voltage
= MAX,
= MIN
2.7
2.0
2.0
3.4
OH
CC
IL
±10%V
I
= -15mA
= MAX
CC
CC
IH
OH
±5%V
V
V
= MIN,
= MAX,
CC
IL
V
V
Low-level output voltage
I
±10%V
0.55
V
OL
OL
CC
V
V
V
V
= MIN,
±5%V
0.42
0.55
-1.2
100
20
V
IH
CC
Input clamp voltage
= MIN, I = I
IK
-0.73
V
IK
CC
CC
CC
I
I
I
Input current at maximum input voltage
High-level input current
= MAX, V = 7.0V
µA
µA
mA
mA
µA
I
I
IH
= MAX, V = 2.7V
I
74F244 OEa, OEb
-1.0
-1.6
-40
I
I
Low-level input current
74F244 Ian, Ibn
V
= MAX, V = 0.5V
I
IL
CC
CC
74F244B all inputs
Off-state output current,
high-level voltage applied
µA
µA
V
= MAX, V = 2.7V
50
OZH
O
Off-state output current,
low-level voltage applied
I
I
V
V
= MAX, V = 0.5V
-50
OZL
CC
O
3
Short-circuit output current
Supply current (total)
= MAX
= MAX
-100
-225
60
mA
mA
mA
mA
mA
mA
mA
OS
CC
I
40
60
60
20
50
29
CCH
74F244
I
V
CC
90
CCL
CCZ
CCH
I
I
90
CC
I
30
74F244B
I
V
CC
= MAX
70
CCL
I
40
CCZ
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V = 5V, T
= 25°C.
amb
CC
3. Not more than one output should be shorted at a time. For testing I , the use of high-speed test apparatus and/or sample-and-hold
OS
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I tests should be performed last.
OS
5
1994 Dec 5
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
AC ELECTRICAL CHARACTERISTICS FOR 74F244
A PORT LIMITS
T
= +25°C
T
= 0°C to +70°C
T
amb
= -40°C to +85°C
= +5.0V ± 10%
amb
amb
V
= +5.0V ± 10%
V
CC
SYMBOL
PARAMETER
TEST
V
= +5.0V
UNIT
CC
CC
CONDITION
C = 50pF,
R = 500Ω
L
C = 50pF,
R = 500Ω
L
C = 50pF,
R = 500Ω
L
L
L
L
MIN
TYP
MAX
MIN
MAX
MIN
MAX
t
t
Propagation delay
Ian, Ibn to Yn
2.5
2.5
4.0
4.0
5.2
5.2
2.0
2.0
6.2
6.5
1.5
2.0
7.0
7.0
PLH
PHL
Waveform 1
ns
ns
ns
t
t
Output enable time
to high or low
Waveform 2
Waveform 4
2.0
2.0
4.3
5.0
5.7
7.0
2.0
2.0
6.7
8.0
2.0
2.0
8.0
8.5
PZH
PZL
t
t
Output disable time
from high or low
Waveform 2
Waveform 4
1.5
1.5
2.5
2.5
5.5
5.5
1.0
1.0
6.0
5.5
1.0
1.0
6.0
5.5
PHZ
PLZ
AC ELECTRICAL CHARACTERISTICS FOR 74F244B
LIMITS
T
= +25°C
= +5.0V
T
= 0°C to +70°C
= +5.0V ± 10%
amb
amb
V
SYMBOL
PARAMETER
TEST
V
UNIT
CC
CC
CONDITION
C = 50pF, R = 500Ω
C = 50pF, R = 500Ω
L L
L
L
MIN
TYP
MAX
MIN
MAX
t
t
Propagation delay
Ian, Ibn to Yn
2.5
2.5
4.5
4.5
5.7
6.0
2.0
2.5
6.2
6.5
PLH
PHL
Waveform 1
ns
ns
t
t
Output enable time
to high or low level
Waveform 2
Waveform 4
2.0
3.0
4.0
5.5
6.0
7.5
2.0
3.0
6.5
8.0
PZH
PZL
t
t
Output disable time
from high or low level
Waveform 2
Waveform 4
1.5
1.5
2.5
2.5
5.5
5.5
1.0
1.0
6.0
5.5
PHZ
PLZ
ns
ns
1, 2
t
Output skew
1.5
2.0
sk(0)
Waveform 3
NOTES:
1. |t actual - t actual| for any output compared to any other output where N and M are either LH or HL.
PN
PM
2. Skew times are valid only under same test conditions (temperature, V , loading, etc.,).
CC
6
1994 Dec 5
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
AC WAVEFORMS
For all waveforms, V = 1.5V.
M
Ian, Ibn
V
M
V
Yn, Yn
Yn, Yn
V
M
t
M
t
(0)
t
sk
PLH
PHL
Yn
V
V
M
V
M
M
SF00231
SF00232
Waveform 1. Propagation Delay for data to outputs
Waveform 3. Output skew
V
V
M
M
t
OEn
Yn
OEn
Yn
V
V
M
M
t
t
t
PLZ
PZH
PHZ
PZL
3.5V
V
–0.3V
OH
V
V
M
M
V
+0.3V
OL
0V
SF00233
SF00234
Waveform 2. 3-State output enable time to high level
and output disable time from high level
Waveform 4. 3-State output enable time to low level
and output disable time from low level
TEST CIRCUIT AND WAVEFORMS
SWITCH POSITION
t
w
AMP (V)
0V
TEST
SWITCH
closed
open
90%
90%
7.0V
V
CC
NEGATIVE
PULSE
t
, t
PLZ PZL
V
V
M
M
All other
10%
10%
R
L
V
V
OUT
IN
t
t
)
)
t
t )
THL ( f
TLH ( r
PULSE
GENERATOR
D.U.T.
t
t
t
t )
TLH ( r
THL ( f
R
C
R
L
AMP (V)
0V
T
L
90%
M
90%
POSITIVE
PULSE
V
V
M
Test circuit for 3-State outputs
DEFINITIONS:
10%
10%
t
w
R
=
Load resistor; see AC electrical characteristics for
value.
Load capacitance includes jig and probe
capacitance; see AC electrical characteristics for
value
Input pulse definition
INPUT PULSE REQUIREMENTS
L
C
=
L
family
V
M
rep. rate
t
t
t
THL
amplitude
w
TLH
R
T
=
Termination resistance should be equal to Z
pulse generators.
of
OUT
74F
3.0V
1.5V
1MHz
500ns 2.5ns
2.5ns
SF000235
7
1994 Dec 5
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
DIP20: plastic dual in-line package; 20 leads (300 mil)
SOT146-1
8
1994 Dec 05
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
SO20: plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
9
1994 Dec 05
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm
SOT339-1
10
1994 Dec 05
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
NOTES
11
1994 Dec 05
Philips Semiconductors
Product specification
Octal buffers (3-State)
74F244/74F244B
DEFINITIONS
Data Sheet Identification
Product Status
Definition
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
Objective Specification
Formative or in Design
Preproduction Product
Full Production
9397-750-05103
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
Preliminary Specification
Product Specification
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. 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 or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. PhilipsSemiconductorsmakesnorepresentationorwarrantythatsuchapplicationswillbesuitableforthespecifiedusewithoutfurthertesting
or modification.
LIFE SUPPORT APPLICATIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
orsystemswheremalfunctionofaPhilipsSemiconductorsandPhilipsElectronicsNorthAmericaCorporationProductcanreasonablybeexpected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Philips Semiconductors and Philips Electronics North America Corporation
register eligible circuits under the Semiconductor Chip Protection Act.
Copyright Philips Electronics North America Corporation 1996
All rights reserved. Printed in U.S.A.
(print code)
Date of release: October 28, 1991
9397-750-05103
Document order number:
相关型号：
©2020 ICPDF网 联系我们和版权申明